WO2022030253A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
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- WO2022030253A1 WO2022030253A1 PCT/JP2021/027204 JP2021027204W WO2022030253A1 WO 2022030253 A1 WO2022030253 A1 WO 2022030253A1 JP 2021027204 W JP2021027204 W JP 2021027204W WO 2022030253 A1 WO2022030253 A1 WO 2022030253A1
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- WIPO (PCT)
- Prior art keywords
- tire
- less
- equation
- mass
- pneumatic tire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0025—Compositions of the sidewalls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/006—Modulus; Hardness; Loss modulus or "tangens delta"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/007—Thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/04—Tyres specially adapted for particular applications for road vehicles, e.g. passenger cars
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- This disclosure relates to pneumatic tires.
- the fuel efficiency of a tire can be evaluated by rolling resistance, and it is known that the smaller the rolling resistance, the better the fuel efficiency of the tire.
- Patent Documents 1 to 4 it has been proposed to reduce the rolling resistance by devising the composition of the rubber composition constituting the tread portion of the tire.
- Japanese Unexamined Patent Publication No. 2018-178034 Japanese Unexamined Patent Publication No. 2019-089911 WO2018 / 186367 Gazette Japanese Unexamined Patent Publication No. 2019-206643
- This disclosure is Pneumatic tires with sides
- the thickness S (mm) of the rubber layer radially outside the carcass of the side portion at the tire maximum width position is 3 mm or less, and the rubber layer has a frequency of 70 ° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%.
- the loss tangent (70 ° C. tan ⁇ ) measured under the conditions of is 0.15 or less.
- the thickness S (mm) of the rubber layer radially outside the carcass of the side portion at the maximum width position of the tire is 3 mm or less, and the rubber layer has a temperature of 70 ° C., a frequency of 10 Hz, and an initial strain of 5%.
- the loss tangent (70 ° C. tan ⁇ ) measured under the condition of a dynamic strain rate of 1% is 0.15 or less.
- the tire according to the present disclosure is further incorporated into a regular rim, the cross-sectional width of the tire is Wt (mm) and the outer diameter is Dt (mm) when the internal pressure is 250 kPa, and the volume of the space occupied by the tire is virtual. It is also characterized by satisfying the following (Equation 1) and (Equation 2) when the volume is V (mm 3 ). 1700 ⁇ (Dt 2 ⁇ ⁇ / 4) / Wt ⁇ 2827.4 ⁇ ⁇ ⁇ (Equation 1) [(V + 1.5 ⁇ 10 7 ) / Wt] ⁇ 2.88 ⁇ 10 5 ⁇ ⁇ (Equation 2)
- the "regular rim” is a rim defined for each tire in the standard system including the standard on which the tire is based.
- JATTA Joint Automobile Tire Association
- "JATTA” If it is a standard rim in the applicable size described in "YEAR BOOK”, ETRTO (The European Tire and Rim Technical Organization), it is described in “STANDARDS MANUAL”, “Measuring Rim”, TRA (The Tire Tire). If it is.), It means “Design Rim” described in "YEAR BOOK”.
- the rim can be assembled and the internal pressure can be maintained, that is, the rim that does not cause air leakage between the rim and the tire has the smallest rim diameter, followed by the rim. Refers to the one with the narrowest width.
- the outer diameter Dt of the tire is the outer diameter of the tire in a state where the tire is assembled to the regular rim and the internal pressure is 250 kPa to make no load
- the cross-sectional width Wt of the tire is the tire.
- the pattern and characters on the side of the tire are based on the straight distance between the sidewalls (total width of the tire) including all the patterns and characters on the side of the tire. It is the width excluding such things.
- the virtual volume V (mm 3 ) of the tire is, specifically, the outer diameter Dt (mm) of the tire in the state where the tire is assembled to the regular rim and the internal pressure is 250 kPa and no load is applied.
- Cross-sectional height (distance from the bottom surface of the bead to the outermost surface of the tread, 1/2 the difference between the tire outer diameter and the nominal rim diameter) Ht (mm), based on the tire cross-sectional width Wt (mm) Can be calculated by the following formula.
- V [(Dt / 2) 2 - ⁇ (Dt / 2) -Ht ⁇ 2 ] ⁇ ⁇ ⁇ Wt
- Mechanism of effect manifestation in tires according to the present disclosure The mechanism of effect manifestation in tires according to the present disclosure, that is, the mechanism by which rolling resistance at high speeds is sufficiently reduced and the durability is sufficiently improved is as follows. It is guessed like.
- (Dt 2 ⁇ ⁇ / 4) / Wt is more preferably 1735 or more, further preferably 1737 or more, further preferably 1749 or more, and further preferably 1751 or more. It is preferable that it is 1753 or more, more preferably 1758 or more, further preferably 1760 or more, further preferably 1787 or more, further preferably 1801 or more, still more preferably 1818 or more. It is more preferably 1853 or more, further preferably 1856 or more, further preferably 1864 or more, further preferably 1865 or more, further preferably 1963.4 or more, still more preferably 2004 or more. It is more preferably 2018 or more, further preferably 2027 or more, further preferably 2030 or more, further preferably 2033 or more, still more preferably 2113 or more.
- the virtual volume V (mm 3 ) and the cross-sectional width Wt (mm) of the tire are further set to [(V + 1.5 ⁇ 10 7 ) / Wt] ⁇ 2.88 ⁇ 10 5 (Equation 2). I am trying to be satisfied.
- [( V + 1.5 ⁇ 107 ) / Wt] is more preferably 2.87 ⁇ 105 or less, further preferably 2.86 ⁇ 105 or less, and 2.77 ⁇ 105 or less. It is more preferably 2.60 ⁇ 105 or less, further preferably 2.58 ⁇ 105 or less, further preferably 2.54 ⁇ 105 or less, and 2.50 ⁇ 10 5 or less . More preferably, it is more preferably 2.42 ⁇ 105 or less, further preferably 2.26 ⁇ 105 or less, further preferably 2.25 ⁇ 105 or less, and 2.24 ⁇ . It is more preferably 105 or less, further preferably 2.21 ⁇ 105 or less, further preferably 2.20 ⁇ 105 or less, and even more preferably 2.19 ⁇ 105 or less. It is more preferably 16 ⁇ 105 or less.
- the above-mentioned [( V + 2.0 ⁇ 107 ) / Wt] is more preferably 2.83 ⁇ 105 or less, further preferably 2.79 ⁇ 105 or less, and 2.77 ⁇ 105 . It is more preferably less than or equal to 2.64 ⁇ 105 or less, further preferably 2.49 ⁇ 105 or less, still more preferably 2.47 ⁇ 105 or less, and 2.46 ⁇ . It is more preferably 105 or less, still more preferably 2.45 ⁇ 105 or less, and even more preferably 2.44 ⁇ 105 or less.
- [( V + 2.5 ⁇ 107 ) / Wt] is more preferably 2.86 ⁇ 105 or less, further preferably 2.77 ⁇ 105 or less, and 2.76 ⁇ 105 or less. It is more preferably 2.72 ⁇ 105 or less, further preferably 2.71 ⁇ 105 or less, further preferably 2.70 ⁇ 105 or less, and 2.69 ⁇ 105 . It is more preferably less than or equal to 2.68 ⁇ 105 or less.
- the thickness S (mm) of the rubber layer forming the side portion on the outer side in the radial direction from the carcass of the side portion at the maximum width position of the tire is set to 3 mm or less.
- the loss tangent (70 ° C. tan ⁇ ) measured under the conditions of a temperature of 70 ° C., a frequency of 10 Hz, an initial strain of 5%, and a radial strain rate of 1% is set to 0.15 or less.
- the 70 ° C. tan ⁇ is more preferably 0.11 or less, and further preferably 0.07 or less.
- the measurement of 70 ° C. tan ⁇ is performed on the rubber cut out from the radial outside of at least the groove bottom of the tire, preferably from the radial outside of the half depth of the deepest circumferential groove.
- the measurement can be performed using, for example, a viscoelasticity measuring device such as "Iplexer (registered trademark)" manufactured by GABO.
- the 70 ° C. tan ⁇ in one of the layers may be 0.15 or less.
- the tire according to the present disclosure is preferably a tire having a flatness of 40% or more.
- the area of the side portion can be increased, so that the heat release property can be further improved, the rolling resistance at high speed running can be further reduced, and the durability of the tire can be further improved.
- the flatness (%) described above can be obtained by the following formula using the cross-sectional height Ht (mm) and the cross-sectional width Wt (mm) of the tire when the internal pressure is 250 kPa. (Ht / Wt) x 100 (%)
- the flattening is more preferably 45% or more, further preferably 47.5% or more, further preferably 49% or more, further preferably 50% or more, and 51% or more. It is more preferably 52.5% or more, further preferably 53% or more, further preferably 55% or more, still more preferably 58% or more. There is no particular upper limit, but for example, it is 100% or less.
- 70 ° C. tan ⁇ ⁇ (V / Wt) ⁇ S is more preferably 72750 or less, further preferably 69624 or less, further preferably 63398 or less, still more preferably 59631 or less.
- 58129 or less is further preferable, 54900 or less is further preferable, 52171 or less is further preferable, 47994 or less is further preferable, 44385 or less is further preferable, 33673 or less is further preferable, and 31884.
- the specific outer diameter Dt (mm) is preferably, for example, 515 mm or more, and more preferably 558 mm or more. It is preferable that it is 585 mm or more, more preferably 649 mm or more, further preferably 658 mm or more, further preferably 663 mm or more, further preferably 664 mm or more, still more preferably 665 mm or more. It is more preferably 672 mm or more, and most preferably 673 mm or more.
- it is preferably less than 843 mm, more preferably 734 mm or less, further preferably less than 725 mm, further preferably 718 mm or less, further preferably 717 mm or less, still more preferably 716 mm or less. It is more preferably 713 mm or less, further preferably 710 mm or less, further preferably less than 707 mm, further preferably 692 mm or less, further preferably 691 mm or less, further preferably less than 685 mm, still more preferably 684 mm or less. Is more preferably, 680 mm or less is further preferable, 679 mm or less is further preferable, and 674 mm or less is further preferable.
- the specific cross-sectional width Wt (mm) is, for example, preferably 115 mm or more, more preferably 130 mm or more, further preferably 150 mm or more, still more preferably 170 mm or more, and even more preferably 175 mm.
- the above is even more preferable, 176 mm or more is even more preferable, 177 mm or more is even more preferable, 178 mm or more is even more preferable, 181 mm or more is even more preferable, and 182 mm or more is further preferable. More preferably, it is particularly preferably 185 mm or more, and most preferably 193 mm or more.
- it is preferably less than 305 mm, more preferably less than 245 mm, further preferably 231 mm or less, further preferably 229 mm or less, further preferably 228 mm or less, still more preferably 227 mm or less. It is more preferably 226 mm or less, further preferably 225 mm or less, further preferably less than 210 mm, further preferably less than 205 mm, further preferably 202 mm or less, further preferably 201 mm or less, still more preferably 200 mm or less. It is more preferably less than 200 mm, further preferably 199 mm or less, further preferably 198 mm or less, still more preferably 196 mm or less.
- the specific cross-sectional height Ht (mm) is, for example, preferably 37 mm or more, more preferably 69 mm or more, further preferably 70 mm or more, further preferably 71 mm or more, and further preferably 78 mm.
- the above is more preferable, 79 mm or more is further preferable, 80 mm or more is further preferable, 87 mm or more is further preferable, 89 mm or more is further preferable, 90 mm or more is further preferable, and 95 mm or more is more preferable. It is more preferably 96 mm or more, further preferably 98 mm or more, and further preferably 99 mm or more.
- it is preferably less than 180 mm, more preferably 117 mm or less, further preferably 113 mm or less, further preferably less than 112 mm, further preferably 104 mm or less, still more preferably 101 mm or less.
- the specific virtual volume V is, for example, preferably 13,000,000 mm 3 or more, more preferably 23,136,067 mm 3 or more, and further preferably 23,206,160 mm 3 or more. It is preferable that it is 23,672,177 mm 3 or more, more preferably 28,431,992 mm 3 or more, further preferably 28,526,824 mm 3 or more, and 29,000,000 mm 3 or more . More preferably, 29,087,378 mm 3 or more, further preferably 30,111,710 mm 3 or more, further preferably 30,354,118 mm 3 or more, 34,196,412 mm 3 or more.
- it is preferably less than 66,000,000 mm3, more preferably 50,043,281 mm3 or less, more preferably less than 44,000,000 mm3, and 43,478,150 mm3 or less. More preferably, it is more preferably 42,618,582 mm 3 or less, further preferably 40,161,995 mm 3 or less, and further preferably less than 38,800,000 mm 3 .
- (Dt-2 ⁇ Ht) is preferably 450 mm or more, more preferably 457 mm or more, and further preferably 470 mm or more. It is more preferably 480 mm or more, further preferably 482 mm or more, and further preferably 484 mm or more.
- the tread portion it is preferably less than 560 mm, more preferably 559 mm or less, further preferably 558 mm or less, further preferably 534 mm or less, still more preferably 533 mm or less. It is more preferably 532 mm or less, further preferably less than 530 mm, further preferably less than 510 mm, further preferably 508 mm or less, further preferably 507 mm or less, still more preferably 506 mm or less.
- the rubber composition forming the side part of the tire according to the present disclosure includes various compounding materials such as the rubber components, fillers, softeners, vulcanizers and vulcanization accelerators described below. Can be obtained by appropriately adjusting the type and amount of.
- Rubber component rubber generally used for manufacturing tires such as butadiene rubber (BR), styrene-butadiene rubber (SBR), isoprene-based rubber, and nitrile rubber (NBR). (Polymer) can be used, but among these, butadiene rubber (BR) and isoprene-based rubber are preferably used.
- BR butadiene rubber
- SBR styrene-butadiene rubber
- NBR nitrile rubber
- (A) BR The content of BR in 100 parts by mass of the rubber component is, for example, preferably 40 parts by mass or more, more preferably 50 parts by mass or more, and further preferably 55 parts by mass or more from the viewpoint of wear resistance. .. On the other hand, from the viewpoint of retaining rolling resistance during high-speed running, it is preferably 75 parts by mass or less, more preferably 70 parts by mass or less, and further preferably 65 parts by mass or less.
- the weight average molecular weight of BR is, for example, more than 100,000 and less than 2 million.
- the vinyl bond amount of BR is, for example, more than 1% by mass and less than 30% by mass.
- the cis content of BR is, for example, more than 1% by mass and 98% by mass or less.
- the amount of trance of BR is, for example, more than 1% by mass and less than 60% by mass.
- the cis content can be measured by infrared absorption spectroscopy.
- the BR is not particularly limited, and BR having a high cis content (cis content of 90% or more), BR having a low cis content, BR containing syndiotactic polybutadiene crystals, and the like can be used.
- the BR may be either a non-modified BR or a modified BR, and as the modified BR, for example, a BR modified with a compound (modifying agent) represented by the following formula can be used.
- R 1 , R 2 and R 3 are the same or different, and contain an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH) or a derivative thereof.
- R 4 and R 5 represent the same or different hydrogen atoms or alkyl groups. R 4 and R 5 may be combined to form a ring structure with nitrogen atoms.
- n represents an integer.
- modified BR modified by the compound (modifying agent) represented by the above formula a BR having a polymerization terminal (active end) modified by the compound represented by the above formula can be used.
- Alkoxy groups are suitable for R 1 , R 2 and R 3 (preferably an alkoxy group having 1 to 8 carbon atoms, and more preferably an alkoxy group having 1 to 4 carbon atoms).
- Alkyl groups (preferably alkyl groups having 1 to 3 carbon atoms) are suitable as R 4 and R 5 .
- n is preferably 1 to 5, more preferably 2 to 4, and even more preferably 3.
- R 4 and R 5 are bonded to form a ring structure together with a nitrogen atom, a 4- to 8-membered ring is preferable.
- the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).
- the above modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, and 2-diethylaminoethyltri.
- Examples thereof include methoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane and the like. These may be used alone or in combination of two or more.
- modified BR a modified BR modified with the following compound (modifying agent) can also be used.
- the modifier include polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethanetriglycidyl ether, and trimethylolpropane triglycidyl ether; and two or more diglycidylated bisphenol A.
- Tetraglycidylaminodiphenylmethane tetraglycidyl-p-phenylenediamine, diglycidylaminomethylcyclohexane, tetraglycidyl-1,3-bisaminomethylcyclohexane and other diglycidylamino compounds; bis- (1-methylpropyl) carbamate chloride, Amino group-containing acid chlorides such as 4-morpholincarbonyl chloride, 1-pyrrolidincarbonyl chloride, N, N-dimethylcarbamide acid chloride, N, N-diethylcarbamide acid chloride; 1,3-bis- (glycidyloxypropyl) -tetra Epoxy group-containing silane compounds such as methyldisiloxane, (3-glycidyloxypropyl) -pentamethyldisiloxane; (trimethylsilyl) [3- (trimethoxysilyl) propyl] sulfide, (trimethyl
- silane compound Containing silane compound; N-substituted aziridine compound such as ethyleneimine and propyleneimine; methyltrietoki Sisilane, N, N-bis (trimethylsilyl) -3-aminopropyltrimethoxysilane, N, N-bis (trimethylsilyl) -3-aminopropyltriethoxysilane, N, N-bis (trimethylsilyl) aminoethyltrimethoxysilane, Alkoxysilanes such as N, N-bis (trimethylsilyl) aminoethyltriethoxysilane; 4-N, N-dimethylaminobenzophenone, 4-N, N-di-t-butylaminobenzophenone, 4-N, N-diphenylamino Benzophenone, 4,4'-bis (dimethylamino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 4,4
- Benzaldehyde compounds having an amino group and / or a substituted amino group such as benzaldehyde; N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, Nt-butyl-2-pyrrolidone, N-substituted pyroridone such as N-methyl-5-methyl-2-pyrrolidone N-substituted piperidone such as N-methyl-2-piperidone, N-vinyl-2-piperidone, N-phenyl-2-piperidone; N-methyl - ⁇ -caprolactam, N-phenyl- ⁇ -caprolactam, N-methyl- ⁇ -laurilolactum, N-vinyl- ⁇ -laurilolactum, N-methyl- ⁇ -propiolactam, N-phenyl- ⁇ -pro N-substituted lactams such as piolactam; in addition, N, N
- BR for example, products such as Ube Industries, Ltd., JSR Corporation, Asahi Kasei Corporation, and Nippon Zeon Corporation can be used.
- the content (total content) of isoprene-based rubber in 100 parts by mass of the rubber component is 25 parts by mass or more from the viewpoint of obtaining good low heat generation and durability during high-speed running. It is preferably 30 parts by mass or more, more preferably 35 parts by mass or more, and further preferably 35 parts by mass or more. On the other hand, it is preferably 55 parts by mass or less, more preferably 50 parts by mass or less, and further preferably 45 parts by mass or less.
- isoprene-based rubber examples include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, modified IR, etc., but NR is preferable from the viewpoint of excellent strength.
- NR for example, SIR20, RSS # 3, TSR20, etc., which are common in the tire industry, can be used.
- the IR is not particularly limited, and for example, an IR 2200 or the like, which is common in the tire industry, can be used.
- Modified NR includes deproteinized natural rubber (DPNR), high-purity natural rubber (UPNR), etc.
- modified NR includes epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber, etc.
- Examples of the modified IR include epoxidized isoprene rubber, hydrogenated isoprene rubber, grafted isoprene rubber and the like. These may be used alone or in combination of two or more.
- the rubber component may contain SBR, if necessary.
- the content of SBR in 100 parts by mass of the rubber component is, for example, 1 part by mass or more and less than 100 parts by mass. It is more preferably more than 5 parts by mass, further preferably more than 15 parts by mass, and particularly preferably more than 25 parts by mass. On the other hand, it is preferably less than 65 parts by mass, more preferably less than 55 parts by mass, further preferably less than 45 parts by mass, and particularly preferably less than 35 parts by mass.
- the weight average molecular weight of SBR is, for example, more than 100,000 and less than 2 million.
- the styrene content of SBR is, for example, preferably more than 5% by mass and less than 50% by mass, more preferably more than 10% by mass and less than 40% by mass, still more preferably more than 20% by mass and less than 35% by mass.
- the vinyl bond amount (1,2-bonded butadiene unit amount) of SBR is, for example, more than 5% by mass and less than 70% by mass.
- the structure identification of SBR (measurement of styrene content and vinyl bond amount) can be performed using, for example, an apparatus of the JNM-ECA series manufactured by JEOL Ltd.
- the SBR is not particularly limited, and for example, emulsion-polymerized styrene-butadiene rubber (E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR), and the like can be used.
- E-SBR emulsion-polymerized styrene-butadiene rubber
- S-SBR solution-polymerized styrene-butadiene rubber
- the SBR may be either a non-modified SBR or a modified SBR, and these may be used alone or in combination of two or more.
- the modified SBR may be any SBR having a functional group that interacts with a filler such as silica.
- a filler such as silica
- at least one end of the SBR is modified with a compound having the above functional group (modifying agent).
- SBR end-modified SBR having the above functional group at the end
- main chain-modified SBR having the above-mentioned functional group in the main chain and main chain-end-modified SBR having the above-mentioned functional group at the main chain and the end (for example, to the main chain)
- SBR for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., JSR Corporation, Asahi Kasei Co., Ltd., Nippon Zeon Co., Ltd., etc. can be used.
- the SBR may be used alone or in combination of two or more.
- Rubber (polymer) generally used in the production of tires such as nitrile rubber (NBR) may be contained.
- NBR nitrile rubber
- the rubber composition preferably contains a filler.
- the filler include carbon black, silica, graphite, calcium carbonate, talc, alumina, clay, aluminum hydroxide, mica and the like, and among these, carbon black can be preferably used as a reinforcing agent. .. Further, if necessary, silica is preferably used as a reinforcing agent, but in this case, it is preferable to use it in combination with a silane coupling agent.
- Carbon black The content of carbon black is preferably, for example, 10 parts by mass or more and 100 parts by mass or less, and 30 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the rubber component. It is more preferably 40 parts by mass or more and 50 parts by mass or less. This makes it possible to improve the crack growth resistance, durability, ultraviolet deterioration resistance, and the like of the tire.
- the nitrogen adsorption specific surface area (N 2 SA) of carbon black is, for example, more than 30 m 2 / g and less than 250 m 2 / g.
- the amount of dibutyl phthalate (DBP) absorbed by carbon black is, for example, more than 50 ml / 100 g and less than 250 ml / 100 g.
- the nitrogen adsorption specific surface area of carbon black is measured according to ASTM D4820-93, and the amount of DBP absorbed is measured according to ASTM D2414-93.
- the carbon black is not particularly limited, and furnace black (furness carbon black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF and ECF; acetylene black (acetylene carbon black).
- furnace black furness carbon black
- thermal black thermal carbon black
- FT and MT channel black
- channel carbon black channel carbon black
- the rubber composition preferably further contains silica, if necessary.
- the BET specific surface area of silica is preferably more than 140 m 2 / g, more preferably more than 160 m 2 / g, from the viewpoint of obtaining good durability performance.
- it is preferably less than 250 m 2 / g, and more preferably less than 220 m 2 / g.
- the content of the silica with respect to 100 parts by mass of the rubber component is preferably more than 35 parts by mass, more preferably more than 40 parts by mass, still more preferably more than 45 parts by mass, from the viewpoint of obtaining good durability performance.
- the above-mentioned BET specific surface area is the value of N 2 SA measured by the BET method according to ASTM D3037-93.
- silica examples include dry silica (anhydrous silica) and wet silica (hydrous silica). Of these, wet silica is preferable because it has a large number of silanol groups.
- silica for example, products such as Degussa, Rhodia, Tosoh Silica Co., Ltd., Solvay Japan Co., Ltd., Tokuyama Corporation can be used.
- the rubber composition preferably contains a silane coupling agent together with silica.
- the silane coupling agent is not particularly limited, and for example, bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (4-triethoxysilylbutyl) tetrasulfide, and the like.
- silane coupling agent for example, products such as Degussa, Momentive, Shinetsu Silicone Co., Ltd., Tokyo Chemical Industry Co., Ltd., Azumax Co., Ltd., Toray Dow Corning Co., Ltd. can be used.
- the content of the silane coupling agent is, for example, more than 3 parts by mass and less than 15 parts by mass with respect to 100 parts by mass of silica.
- the rubber composition is commonly used in the tire industry, for example, graphite, calcium carbonate, talc, alumina, clay, aluminum hydroxide. , Mica and the like may be further contained. These contents are, for example, more than 0.1 part by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition may contain oil (including spreading oil), liquid rubber, or the like as a softener.
- oil including spreading oil
- the total content of these is, for example, more than 5 parts by mass, more preferably more than 10 parts by mass, and even more preferably more than 12 parts by mass with respect to 100 parts by mass of the rubber component. Further, less than 30 parts by mass is preferable, less than 20 parts by mass is more preferable, and less than 17 parts by mass is further preferable.
- the oil content also includes the amount of oil contained in rubber (oil spread rubber).
- oils and fats examples include castor oil, cottonseed oil, sesame oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut oil, rosin, pine oil, pineapple, tall oil, corn oil, rice oil, beni flower oil, and sesame oil.
- examples thereof include olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, and tung oil. These may be used alone or in combination of two or more.
- process oils include Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., Japan Energy Co., Ltd., Orisoi Co., Ltd., H & R Co., Ltd., Toyokuni Oil Co., Ltd., Showa Shell Sekiyu Co., Ltd., Products such as Fuji Kosan Co., Ltd. can be used.
- the liquid rubber mentioned as the softener is a polymer in a liquid state at room temperature (25 ° C.) and a polymer having a monomer similar to that of solid rubber as a constituent element.
- the liquid rubber include farnesene-based polymers, liquid diene-based polymers, and hydrogenated additives thereof.
- the farnesene-based polymer is a polymer obtained by polymerizing farnesene and has a structural unit based on farnesene.
- Farnesene includes ⁇ -farnesene ((3E, 7E) -3,7,11-trimethyl-1,3,6,10-dodecatetraene) and ⁇ -farnesene (7,11-dimethyl-3-methylene-1). , 6,10-dodecatorien) and other isomers are present.
- the farnesene-based polymer may be a farnesene homopolymer (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer).
- liquid diene polymer examples include a liquid styrene-butadiene polymer (liquid SBR), a liquid butadiene polymer (liquid BR), a liquid isoprene polymer (liquid IR), and a liquid styrene isoprene copolymer (liquid SIR). Be done.
- liquid SBR liquid styrene-butadiene polymer
- liquid BR liquid butadiene polymer
- liquid IR liquid isoprene polymer
- liquid SIR liquid styrene isoprene copolymer
- the polystyrene-equivalent weight average molecular weight (Mw) of the liquid diene polymer measured by gel permeation chromatography (GPC) is, for example, more than 1.0 ⁇ 10 3 and less than 2.0 ⁇ 105 .
- Mw of the liquid diene polymer is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).
- liquid rubber for example, products such as Kuraray Co., Ltd. and Clay Valley Co., Ltd. can be used.
- the rubber composition preferably contains a resin component, if necessary.
- the resin component may be solid or liquid at room temperature, and specific resin components include, for example, styrene-based resin, kumaron-based resin, terpene-based resin, C5 resin, C9 resin, and C5C9 resin. Resin components such as acrylic resin may be mentioned, and two or more kinds may be used in combination.
- the content of the resin component is more than 2 parts by mass, preferably less than 45 parts by mass, and more preferably less than 30 parts by mass with respect to 100 parts by mass of the rubber component.
- the styrene-based resin is a polymer using a styrene-based monomer as a constituent monomer, and examples thereof include a polymer obtained by polymerizing a styrene-based monomer as a main component (50% by mass or more).
- styrene-based monomers styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, ⁇ -methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-Chlorostyrene, m-chlorostyrene, p-chlorostyrene, etc.
- styrene-based monomers are individually polymerized, and in addition to copolymers obtained by copolymerizing two or more styrene-based monomers, styrene-based monomers And other monomer copolymers that can be copolymerized with this.
- Examples of the other monomers include acrylonitriles such as acrylonitrile and methacrylate, unsaturated carboxylic acids such as acrylics and methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate, chloroprene and butadiene.
- Examples thereof include dienes such as isoprene, olefins such as 1-butane and 1-pentene; ⁇ , ⁇ -unsaturated carboxylic acids such as maleic anhydride or acid anhydrides thereof.
- the kumaron inden resin is a resin containing kumaron and inden as monomer components constituting the skeleton (main chain) of the resin.
- Examples of the monomer component contained in the skeleton other than kumaron and indene include styrene, ⁇ -methylstyrene, methylindene, vinyltoluene and the like.
- the content of the Kumaron indene resin is, for example, more than 1.0 part by mass and less than 50.0 parts by mass with respect to 100 parts by mass of the rubber component.
- the hydroxyl value (OH value) of the Kumaron indene resin is, for example, more than 15 mgKOH / g and less than 150 mgKOH / g.
- the OH value is the amount of potassium hydroxide required to neutralize the acetic acid bonded to the hydroxyl group when acetylating 1 g of the resin in milligrams, and is represented by the potential difference dropping method (JIS K 0070:). It is a value measured by 1992).
- the softening point of the Kumaron inden resin is, for example, more than 30 ° C and less than 160 ° C.
- the softening point is the temperature at which the ball drops when the softening point defined in JIS K 6220-1: 2001 is measured by a ring-ball type softening point measuring device.
- terpene-based resin examples include polyterpenes, terpene phenols, aromatic-modified terpene resins and the like.
- Polyterpene is a resin obtained by polymerizing a terpene compound and a hydrogenated additive thereof.
- the terpene compound is a hydrocarbon having a composition of ( C 5 H 8 ) n and an oxygen - containing derivative thereof .
- Etc. which are compounds having a terpene as a basic skeleton, for example, ⁇ -pinene, ⁇ -pinene, dipentene, limonene, milsen, aloocimen, ossimen, ⁇ -ferandrene, ⁇ -terpinene, ⁇ -terpinene, terpinolene. , 1,8-Cineol, 1,4-Cineol, ⁇ -terpineol, ⁇ -terpineol, ⁇ -terpineol and the like.
- polyterpene examples include terpene resins such as ⁇ -pinene resin, ⁇ -pinene resin, limonene resin, dipentene resin, and ⁇ -pinene / limonene resin made from the above-mentioned terpene compound, as well as hydrogen obtained by hydrogenating the terpene resin.
- Additive terpene resin can also be mentioned.
- the terpene phenol include a resin obtained by copolymerizing the above-mentioned terpene compound and the phenol-based compound, and a resin obtained by hydrogenating the resin. Specifically, the above-mentioned terpene compound, the phenol-based compound and the formalin are condensed. Resin is mentioned.
- Examples of the phenolic compound include phenol, bisphenol A, cresol, xylenol and the like.
- examples of the aromatic-modified terpene resin include a resin obtained by modifying a terpene resin with an aromatic compound, and a resin obtained by hydrogenating the resin.
- the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring, and for example, a phenol compound such as a phenol, an alkylphenol, an alkoxyphenol, or an unsaturated hydrocarbon group-containing phenol; naphthol, alkylnaphthol, alkoxynaphthol, etc.
- Naftor compounds such as unsaturated hydrocarbon group-containing naphthols; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, unsaturated hydrocarbon group-containing styrene; kumaron, inden and the like can be mentioned.
- C5 resin refers to a resin obtained by polymerizing a C5 fraction.
- the C5 fraction include petroleum distillates having 4 to 5 carbon atoms such as cyclopentadiene, pentene, pentadiene, and isoprene.
- a dicyclopentadiene resin DCPD resin
- DCPD resin dicyclopentadiene resin
- the "C9 resin” refers to a resin obtained by polymerizing a C9 fraction, and may be hydrogenated or modified.
- the C9 fraction include petroleum fractions having 8 to 10 carbon atoms such as vinyltoluene, alkylstyrene, indene, and methyl indene.
- a kumaron indene resin, a kumaron resin, an indene resin, and an aromatic vinyl-based resin are preferably used.
- aromatic vinyl resin a homopolymer of ⁇ -methylstyrene or styrene or a copolymer of ⁇ -methylstyrene and styrene is preferable because it is economical, easy to process, and excellent in heat generation. , A polymer of ⁇ -methylstyrene and styrene is more preferred.
- aromatic vinyl-based resin for example, those commercially available from Clayton, Eastman Chemical, etc. can be used.
- C5C9 resin refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be hydrogenated or modified.
- Examples of the C5 fraction and the C9 fraction include the above-mentioned petroleum fraction.
- As the C5C9 resin for example, those commercially available from Tosoh Corporation, LUHUA, etc. can be used.
- the acrylic resin is not particularly limited, but for example, a solvent-free acrylic resin can be used.
- the solvent-free acrylic resin is a high-temperature continuous polymerization method (high-temperature continuous lump polymerization method) (US Pat. No. 4,414,370) without using a polymerization initiator, a chain transfer agent, an organic solvent, etc. as auxiliary raw materials as much as possible.
- Examples thereof include a (meth) acrylic resin (polymer) synthesized by the method described in ⁇ 45 and the like).
- (meth) acrylic means methacrylic and acrylic.
- Examples of the monomer component constituting the acrylic resin include (meth) acrylic acid, (meth) acrylic acid ester (alkyl ester, aryl ester, aralkyl ester, etc.), (meth) acrylamide, and (meth) acrylamide derivative.
- (Meta) acrylic acid derivatives such as.
- acrylic resin styrene, ⁇ -methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene, divinylnaphthalene, etc., together with (meth) acrylic acid and (meth) acrylic acid derivative, etc.
- Aromatic vinyl may be used as the monomer component constituting the acrylic resin.
- the acrylic resin may be a resin composed of only a (meth) acrylic component or a resin having a component other than the (meth) acrylic component as a component. Further, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.
- Examples of the resin component include Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Toso Co., Ltd., Rutgers Chemicals Co., Ltd., BASF Co., Ltd., Arizona Chemical Co., Ltd., Nikko Chemical Co., Ltd., Co., Ltd. ) Products such as Nippon Shokubai, JX Energy Co., Ltd., Arakawa Chemical Industry Co., Ltd., Taoka Chemical Industry Co., Ltd. can be used.
- the rubber composition preferably contains an anti-aging agent.
- the content of the anti-aging agent is, for example, more than 1 part by mass and less than 10 parts by mass, and more preferably 6.5 parts by mass or more with respect to 100 parts by mass of the rubber component.
- antiaging agent examples include naphthylamine-based antiaging agents such as phenyl- ⁇ -naphthylamine; diphenylamine-based antiaging agents such as octylated diphenylamine and 4,4'-bis ( ⁇ , ⁇ '-dimethylbenzyl) diphenylamine; N. -Isopropyl-N'-phenyl-p-phenylenediamine, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N, N'-di-2-naphthyl-p-phenylenediamine, etc.
- P-Phenylenediamine-based anti-aging agent P-Phenylenediamine-based anti-aging agent
- quinoline-based anti-aging agent such as a polymer of 2,2,4-trimethyl-1,2-dihydroquinolin
- 2,6-di-t-butyl-4-methylphenol Monophenolic antioxidants such as styrenated phenol; tetrakis- [methylene-3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] bis, tris
- polyphenolic aging such as methane Examples include inhibitors. These may be used alone or in combination of two or more.
- anti-aging agent for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexis Co., Ltd., etc. can be used.
- the rubber composition may contain stearic acid.
- the content of stearic acid is, for example, more than 0.5 parts by mass and less than 10.0 parts by mass, and more preferably 3 parts by mass or more with respect to 100 parts by mass of the rubber component.
- stearic acid conventionally known ones can be used, and for example, products such as NOF Corporation, NOF Corporation, Kao Corporation, Fujifilm Wako Pure Chemical Industries, Ltd., and Chiba Fatty Acid Co., Ltd. can be used.
- the rubber composition may contain zinc oxide.
- the content of zinc oxide is, for example, more than 0.5 parts by mass and less than 10 parts by mass, and more preferably 4.5 parts by mass or more with respect to 100 parts by mass of the rubber component.
- conventionally known products can be used, for example, products of Mitsui Metal Mining Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Shodo Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. Can be used.
- the rubber composition preferably contains wax.
- the content of the wax is, for example, 0.5 to 20 parts by mass, preferably 1.0 to 15 parts by mass, more preferably 1.5 to 10 parts by mass, and 2 parts by mass with respect to 100 parts by mass of the rubber component. It is more preferable that the amount is more than one part.
- the wax is not particularly limited, and examples thereof include petroleum wax such as paraffin wax and microcrystalline wax; natural wax such as plant wax and animal wax; and synthetic wax such as a polymer such as ethylene and propylene. These may be used alone or in combination of two or more.
- wax for example, products such as Ouchi Shinko Kagaku Kogyo Co., Ltd., Nippon Seiro Co., Ltd., and Seiko Kagaku Co., Ltd. can be used.
- the rubber composition preferably contains a cross-linking agent such as sulfur.
- the content of the cross-linking agent is, for example, more than 0.1 part by mass and less than 10.0 parts by mass, and more preferably 2 parts by mass or more with respect to 100 parts by mass of the rubber component.
- sulfur examples include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and soluble sulfur, which are generally used in the rubber industry. These may be used alone or in combination of two or more.
- sulfur for example, products such as Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemicals Corporation, Flexis Co., Ltd., Nippon Kanryo Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd. can be used. ..
- cross-linking agent other than sulfur examples include Tackilol V200 manufactured by Taoka Chemical Industry Co., Ltd., DURALINK HTS (1,6-hexamethylene-sodium dithiosulfate / dihydrate) manufactured by Flexis, and KA9188 manufactured by LANXESS.
- examples thereof include a vulcanizing agent containing a sulfur atom such as (1,6-bis (N, N'-dibenzylthiocarbamoyldithio) hexane) and an organic peroxide such as dicumyl peroxide.
- the rubber composition preferably contains a vulcanization accelerator.
- the content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass, more preferably 1 part by mass or more, and 1.5 parts by mass with respect to 100 parts by mass of the rubber component. It is more preferable that the amount is more than one part.
- sulfide accelerator examples include thiazole-based sulfide accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiadylsulfenamide; tetramethylthiuram disulfide (TMTD).
- thiazole-based sulfide accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiadylsulfenamide
- TMTD tetramethylthiuram disulfide
- TzTD Tetrabenzyl thiuram disulfide
- TOT-N tetrakis (2-ethylhexyl) thiuram disulfide
- other thiuram-based sulfide accelerators N-cyclohexyl-2-benzothiazolesulfenamide, N-t-butyl- 2-benzothiazolyl sulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N, N'-diisopropyl-2-benzothiazolesulfenamide, etc.
- Sulfenamide-based sulphurization accelerator such as diphenylguanidine, dioltotrilguanidine, orthotrilbiguanidine can be mentioned. These may be used alone or in combination of two or more.
- additives generally used in the tire industry such as fatty acid metal salts, carboxylic acid metal salts, and organic peroxides, may be further added to the rubber composition. good.
- the content of these additives is, for example, more than 0.1 part by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition is obtained by a general method, for example, a base kneading step of kneading a rubber component and a filler such as carbon black, and a kneaded product obtained by the base kneading step. It is produced by a manufacturing method including a finishing kneading step of kneading and a cross-linking agent.
- Kneading can be performed using a known (sealed) kneader such as a Banbury mixer, a kneader, or an open roll.
- a known (sealed) kneader such as a Banbury mixer, a kneader, or an open roll.
- the kneading temperature of the base kneading step is, for example, more than 50 ° C. and less than 200 ° C.
- the kneading time is, for example, more than 30 seconds and less than 30 minutes.
- compounding agents conventionally used in the rubber industry such as softeners such as oil, stearic acid, zinc oxide, antiaging agents, waxes, vulcanization accelerators, etc., are used as needed. May be added and kneaded as appropriate.
- the finish kneading step the kneaded product obtained in the base kneading step and the cross-linking agent are kneaded.
- the kneading temperature of the finish kneading step is, for example, above room temperature and less than 80 ° C.
- the kneading time is, for example, more than 1 minute and less than 15 minutes.
- a vulcanization accelerator, zinc oxide and the like may be appropriately added and kneaded as needed.
- the tire of the present disclosure is manufactured by a usual method using an unvulcanized rubber composition obtained through the finish kneading step. That is, the unvulcanized rubber composition is extruded according to the shape of the sidewall and molded together with other tire members by a normal method on a tire molding machine to first produce an unvulcanized tire. do.
- the inner liner as a member to ensure the airtightness of the tire
- the carcass as a member to withstand the load, impact, and filling air pressure received by the tire
- the carcass as a member to withstand the filling air pressure
- a belt or the like as a member to be raised is wound, both ends of the carcass are fixed to both side edges, and a bead part as a member for fixing the tire to the rim is arranged and formed into a toroid shape, and then the center of the outer circumference.
- An unvulcanized tire is manufactured by attaching a tread to the portion and a sidewall on the outer side in the radial direction to form a side portion.
- the belt is provided with an inclined belt layer that extends at an angle of 15 ° to 30 ° with respect to the tire circumferential direction, thereby ensuring the durability of the tire.
- the rigidity of the tread can be sufficiently maintained. Further, since it can be restrained in the circumferential direction, it becomes easy to suppress the growth of the outer diameter.
- the vulcanization step can be carried out by applying a known vulcanization means.
- the vulcanization temperature is, for example, more than 120 ° C. and less than 200 ° C.
- the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.
- the tire is incorporated into a regular rim, and when the internal pressure is 250 kPa, the tire is formed into a shape that satisfies the above (formula 1) and (formula 2).
- Specific tires that can satisfy the above (formula 1) and (formula 2) include 145 / 60R18, 145 / 60R19, 155 / 55R18, 155 / 55R19, 155 / 70R17, 155 / 70R19, 165 / 55R20. , 165 / 55R21, 165 / 60R19, 165 / 65R19, 165 / 70R18, 175 / 55R19, 175 / 55R20, 175 / 55R22, 175 / 60R18, 185 / 55R19, 185 / 60R20, 195 / 50R20, 195 / 55R20, etc. Examples are tires with size notation.
- Blending material First, each blending material shown below was prepared.
- Rubber component (a) NR: TSR20 (B) BR-1: UBEPOL-BR150B manufactured by Ube Industries, Ltd. (Sis content: 97% by mass) (C) BR-2: Nippon Zeon Co., Ltd. Nipol-BR1250H (Tin-terminated BR, cis content: 40% by mass) (D) BR-3: UBEPOL VCR617 manufactured by Ube Industries, Ltd. (Sis content: 98% by mass)
- Blending materials other than rubber components (a) Carbon black: Show Black N550 manufactured by Cabot Japan Co., Ltd. (N 2 SA: 42m 2 / g) (B) Oil: Process X-140 manufactured by Japan Energy Co., Ltd. (C) Stearic acid: Stearic acid "Camellia” manufactured by NOF CORPORATION (D) Zinc oxide: Zinc oxide No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd. (e) Wax: Sanknock wax manufactured by Ouchi Shinko Chemical Co., Ltd. (f) Anti-aging agent-1: Ouchi Shinko Chemical Industry Co., Ltd.
- Nocrack 6C made by (N-Phenyl-N'-(1,3-dimethylbutyl) -p-phenylenediamine)
- G Anti-aging agent-2: Antage RD manufactured by Kawaguchi Chemical Industry Co., Ltd. (2,2,4-trimethyl-1,2-dihydroquinoline)
- H Cross-linking agent and vulcanization accelerator
- Sulfur Powdered sulfur manufactured by Tsurumi Chemical Industry Co., Ltd.
- Vulcanization accelerator Noxeller NS manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-tert-butyl-2-benzothiazolyl sulphenamide)
- each test tire is attached to all wheels of the vehicle (domestic FF vehicle, displacement 2000cc), filled with air so that the internal pressure becomes 250 kPa, and then on the test course on a dry road surface.
- the driver sensually inspected the ride comfort when traveling 10 laps at a speed of 100 km / h in 5 stages.
- the total score in Example 4-3 was set to 100, and the evaluation was indexed based on the following formula to relatively evaluate the ride quality. The larger the number, the better the ride quality.
- Ride quality [(total evaluation score of test tire) / (total evaluation score of Example 4-3)] ⁇ 100
- the present disclosure (1) is Pneumatic tires with sides
- the thickness S (mm) of the rubber layer radially outside the carcass of the side portion at the tire maximum width position is 3 mm or less, and the rubber layer has a frequency of 70 ° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%.
- the loss tangent (70 ° C. tan ⁇ ) measured under the conditions of is 0.15 or less.
- This disclosure (2) is based on The pneumatic tire according to the present disclosure (1), which is characterized by satisfying the following (formula 3). [(V + 2.0 ⁇ 10 7 ) / Wt] ⁇ 2.88 ⁇ 10 5 ⁇ ⁇ (Equation 3)
- This disclosure (3) is The pneumatic tire according to the present disclosure (2), which is characterized by satisfying the following (formula 4). [(V + 2.5 ⁇ 10 7 ) / Wt] ⁇ 2.88 ⁇ 10 5 ⁇ ⁇ (Equation 4)
- the present disclosure (4) is When the tire is built into a regular rim and the internal pressure is 250 kPa, the outer diameter of the tire is Dt (mm), and the cross-sectional height of the tire is Ht (mm), (Dt-2 x Ht) is 470 (mm) or more. It is a pneumatic tire in any combination with any of the present disclosures (1) to (3).
- the present disclosure (5) is It is a pneumatic tire in any combination with any of the present disclosures (1) to (4), characterized in that the flatness is 40% or more.
- the present disclosure (6) is The pneumatic tire according to the present disclosure (5), characterized in that the flatness is 45% or more.
- the present disclosure (7) is The pneumatic tire according to the present disclosure (6), characterized in that the flatness is 47.5% or more.
- the present disclosure (8) is The pneumatic tire according to the present disclosure (7), characterized in that the flatness is 50% or more.
- the present disclosure (9) is It is a pneumatic tire in any combination with any of the present disclosures (1) to (8), which is characterized by satisfying the following (formula 5). 70 ° C. tan ⁇ ⁇ (V / Wt) ⁇ S ⁇ 80000 ⁇ ⁇ ⁇ ⁇ (Equation 5)
- the present disclosure (10) is The pneumatic tire according to the present disclosure (9), which is characterized by satisfying the following (formula 6). 70 ° C. tan ⁇ ⁇ (V / Wt) ⁇ S ⁇ 60000 ⁇ ⁇ ⁇ ⁇ (Equation 6)
- the present disclosure (11) is The pneumatic tire according to the present disclosure (10), which is characterized by satisfying the following (formula 7). 70 ° C. tan ⁇ ⁇ (V / Wt) ⁇ S ⁇ 40000 ⁇ ⁇ ⁇ ⁇ (Equation 7)
- the present disclosure (12) is The pneumatic tire according to the present disclosure (11), which is characterized by satisfying the following (formula 8). 70 ° C. tan ⁇ ⁇ (V / Wt) ⁇ S ⁇ 35000 ⁇ ⁇ ⁇ ⁇ (Equation 8)
- the present disclosure (13) is It is characterized in that the Dt is less than 685 (mm) when the outer diameter of the tire is Dt (mm) when it is incorporated in a regular rim and the internal pressure is 250 kPa. Pneumatic tires in any combination with any.
- the present disclosure (14) is The pneumatic tire having a cross-sectional width Wt (mm) of less than 205 mm and in any combination with any of the disclosures (1) to (13).
- the present disclosure is The pneumatic tire according to the present disclosure (14), characterized in that the cross-sectional width Wt (mm) is less than 200 mm.
- the present disclosure (16) It is a pneumatic tire for a passenger car, and is a pneumatic tire in any combination with any of the disclosures (1) to (15).
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Abstract
Description
サイド部を有する空気入りタイヤであって、
タイヤ最大幅位置における前記サイド部のカーカスより半径方向外側のゴム層の厚みS(mm)が3mm以下であると共に、前記ゴム層の70℃、周波数10Hz、初期歪5%、動歪率1%の条件下で測定された損失正接(70℃tanδ)が、0.15以下であり、
正規リムに組み込み、内圧を250kPaとした際のタイヤの断面幅をWt(mm)、外径をDt(mm)とし、タイヤが占める空間の体積を仮想体積V(mm3)としたとき、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤである。
1700≦(Dt2×π/4)/Wt≦2827.4 ・・・(式1)
[(V+1.5×107)/Wt]≦2.88×105 ・・(式2)
最初に、本開示に係るタイヤの特徴について説明する。
本開示に係るタイヤは、タイヤ最大幅位置におけるサイド部のカーカスより半径方向外側のゴム層の厚みS(mm)が3mm以下であると共に、ゴム層の70℃、周波数10Hz、初期歪5%、動歪率1%の条件下で測定された損失正接(70℃tanδ)が、0.15以下であることを特徴としている。
1700≦(Dt2×π/4)/Wt≦2827.4 ・・・(式1)
[(V+1.5×107)/Wt]≦2.88×105 ・・(式2)
V=[(Dt/2)2-{(Dt/2)-Ht}2]×π×Wt
本開示に係るタイヤにおける効果発現のメカニズム、即ち、高速走行時における転がり抵抗が十分に低減され、さらに、耐久性が十分に改善されるメカニズムについては、以下のように推測される。
上記したように、本開示においては、タイヤの断面幅Wt(mm)と外径Dt(mm)とが、1700≦(Dt2×π/4)/Wt≦2827.4(式1)を満足するようにしている。
本開示においては、さらに、サイド部を形成するゴム層について、タイヤ最大幅位置におけるサイド部のカーカスより半径方向外側の厚みS(mm)を3mm以下とすると共に、温度70℃、周波数10Hz、初期歪5%、動歪率1%の条件下で測定された損失正接(70℃tanδ)を、0.15以下としている。
本開示に係るタイヤは、以下の態様を取ることにより、さらに大きな効果を得ることができる。
本開示に係るタイヤは、扁平率が40%以上のタイヤであることが好ましい。これにより、サイド部の面積を大きくすることができるため、熱放出性がより向上して、高速走行時における転がり抵抗をさらに低減させると共に、タイヤの耐久性をさらに高めることができる。
(Ht/Wt)×100(%)
サイド部が、分厚く、かつ面積が大きい場合、サイド部の熱放出量よりも発熱量が大きくなる恐れがある。そこで、サイド部の体積に関係する指標である(V/Wt)×Sと、発熱性に関する指標である70℃tanδとの関係について、検討したところ、70℃tanδ×(V/Wt)×S≦80000(式5)を満足していれば、適切に発熱性をコントロールでき、高速走行時における転がり抵抗をさらに低減させると共に、タイヤの耐久性をさらに高めることができることが分かった。
本開示に係るタイヤにおいて、正規リムに組み込み、内圧を250kPaとした際、具体的な外径Dt(mm)としては、例えば、515mm以上であることが好ましく、558mm以上であるとより好ましく、585mm以上であるとさらに好ましく、649mm以上であるとさらに好ましく、658mm以上であるとさらに好ましく、663mm以上であるとさらに好ましく、664mm以上であるとさらに好ましく、665mm以上であるとさらに好ましく、672mm以上であるとさらに好ましく、673mm以上であると最も好ましい。
以下、実施の形態に基づいて、本開示を具体的に説明する。
本開示に係るタイヤのサイド部を形成するゴム組成物は、以下に記載するゴム成分、充填剤、軟化剤、加硫剤および加硫促進剤などの各種配合材料について、その種類や量を、適宜、調整することにより得ることができる。
本実施の形態において、ゴム成分としては、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、イソプレン系ゴム、ニトリルゴム(NBR)などのタイヤの製造に一般的に用いられるゴム(ポリマー)を用いることができるが、これらの内でも、ブタジエンゴム(BR)とイソプレン系ゴムとを使用することが好ましい。
ゴム成分100質量部中のBRの含有量は、例えば、耐摩耗性の観点から40質量部以上であることが好ましく、50質量部以上であるとより好ましく、55質量部以上であるとさらに好ましい。一方、高速走行時の転がり抵抗の保持性の観点からは、75質量部以下であることが好ましく、70質量部以下であるとより好ましく、65質量部以下であるとさらに好ましい。
ゴム成分100質量部中のイソプレン系ゴムの含有量(合計含有量)は、良好な高速走行時の低発熱性と耐久性能が得られる観点から、25質量部以上であることが好ましく、30質量部以上であるとより好ましく、35質量部以上であるとさらに好ましい。一方、55質量部以下であることが好ましく、50質量部以下であるとより好ましく、45質量部以下であるとさらに好ましい。
ゴム成分には、必要に応じて、SBRを含有してもよい。このとき、ゴム成分100質量部中のSBRの含有量は、例えば、1質量部以上、100質量部未満である。5質量部超であるとより好ましく、15質量部超であるとさらに好ましく、25質量部超であると特に好ましい。一方、65質量部未満であることが好ましく、55質量部未満であるとより好ましく、45質量部未満であるとさらに好ましく、35質量部未満であると特に好ましい。
また、その他のゴム成分として、ニトリルゴム(NBR)などのタイヤの製造に一般的に用いられるゴム(ポリマー)を含んでもよい。
(a)充填剤
本実施の形態において、ゴム組成物は、充填剤を含有することが好ましい。具体的な充填剤としては、例えば、カーボンブラック、シリカ、グラファイト、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカなどが挙げられ、この内でも、カーボンブラックが、補強剤として好ましく使用できる。また、必要に応じて、補強剤として、シリカを使用することも好ましいが、この場合には、シランカップリング剤と併用することが好ましい。
カーボンブラックの含有量は、ゴム成分100質量部に対して、例えば、10質量部以上、100質量部以下であることが好ましく、30質量部以上、70質量部以下であるとより好ましく、40質量部以上、50質量部以下であるとさらに好ましい。これにより、タイヤの耐亀裂成長性、耐久性、耐紫外線劣化性などを向上させることができる。
ゴム組成物は、必要に応じて、さらに、シリカを含むことが好ましい。シリカのBET比表面積は、良好な耐久性能が得られる観点から140m2/g超が好ましく、160m2/g超がより好ましい。一方、良好な高速走行時の転がり抵抗性を得られる観点からは250m2/g未満が好ましく、220m2/g未満であることがより好ましい。また、ゴム成分100質量部に対する前記シリカの含有量は、良好な耐久性能を得る観点から35質量部超が好ましく、40質量部超がより好ましく、45質量部超がさらに好ましい。一方、良好な高速走行時の転がり抵抗性を得る観点からは、70質量部未満が好ましく、65質量部未満がより好ましく、60質量部未満がさらに好ましい。なお、上記したBET比表面積は、ASTM D3037-93に準じてBET法で測定されるN2SAの値である。
ゴム組成物は、前記したように、シリカと共にシランカップリング剤を含むことが好ましい。シランカップリング剤としては、特に限定されず、例えば、ビス(3-トリエトキシシリルプロピル)テトラスルフィド、ビス(2-トリエトキシシリルエチル)テトラスルフィド、ビス(4-トリエトキシシリルブチル)テトラスルフィド、ビス(3-トリメトキシシリルプロピル)テトラスルフィド、ビス(2-トリメトキシシリルエチル)テトラスルフィド、ビス(2-トリエトキシシリルエチル)トリスルフィド、ビス(4-トリメトキシシリルブチル)トリスルフィド、ビス(3-トリエトキシシリルプロピル)ジスルフィド、ビス(2-トリエトキシシリルエチル)ジスルフィド、ビス(4-トリエトキシシリルブチル)ジスルフィド、ビス(3-トリメトキシシリルプロピル)ジスルフィド、ビス(2-トリメトキシシリルエチル)ジスルフィド、ビス(4-トリメトキシシリルブチル)ジスルフィド、3-トリメトキシシリルプロピル-N,N-ジメチルチオカルバモイルテトラスルフィド、2-トリエトキシシリルエチル-N,N-ジメチルチオカルバモイルテトラスルフィド、3-トリエトキシシリルプロピルメタクリレートモノスルフィド、などのスルフィド系、3-メルカプトプロピルトリメトキシシラン、2-メルカプトエチルトリエトキシシラン、Momentive社製のNXT、NXT-Zなどのメルカプト系、ビニルトリエトキシシラン、ビニルトリメトキシシランなどのビニル系、3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシランなどのアミノ系、γ-グリシドキシプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシランなどのグリシドキシ系、3-ニトロプロピルトリメトキシシラン、3-ニトロプロピルトリエトキシシランなどのニトロ系、3-クロロプロピルトリメトキシシラン、3-クロロプロピルトリエトキシシランなどのクロロ系などがあげられる。これらは、単独で用いてもよく、2種以上を併用してもよい。
ゴム組成物には、上記したカーボンブラック、シリカの他に、タイヤ工業において一般的に用いられている、例えば、グラファイト、炭酸カルシウム、タルク、アルミナ、クレー、水酸化アルミニウム、マイカ等の充填剤をさらに含有してもよい。これらの含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、200質量部未満である。
ゴム組成物は、オイル(伸展油を含む)や液状ゴム等を軟化剤として含んでもよい。これらの合計含有量は、ゴム成分100質量部に対して、例えば、5質量部超が好ましく、10質量部超がより好ましく、12質量部超がさらに好ましい。また、30質量部未満が好ましく、20質量部未満がより好ましく、17質量部未満がさらに好ましい。なお、オイルの含有量には、ゴム(油展ゴム)に含まれるオイルの量も含まれる。
ゴム組成物は、必要に応じて、樹脂成分を含有することが好ましい。樹脂成分は、常温で固体であっても、液体であってもよく、具体的な樹脂成分としては、例えば、スチレン系樹脂、クマロン系樹脂、テルペン系樹脂、C5樹脂、C9樹脂、C5C9樹脂、アクリル系樹脂等の樹脂成分が挙げられ、2種以上を併用しても良い。樹脂成分の含有量は、ゴム成分100質量部に対して、2質量部超で、45質量部未満が好ましく、30質量部未満がより好ましい。
ゴム組成物は、老化防止剤を含むことが好ましい。老化防止剤の含有量は、ゴム成分100質量部に対して、例えば、1質量部超、10質量部未満であり、6.5質量部以上であるとより好ましい。
ゴム組成物は、ステアリン酸を含んでもよい。ステアリン酸の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、10.0質量部未満であり、3質量部以上であるとより好ましい。ステアリン酸としては、従来公知のものを使用でき、例えば、日油(株)、NOF社、花王(株)、富士フイルム和光純薬(株)、千葉脂肪酸(株)等の製品を使用できる。
ゴム組成物は、酸化亜鉛を含んでもよい。酸化亜鉛の含有量は、ゴム成分100質量部に対して、例えば、0.5質量部超、10質量部未満であり、4.5質量部以上であるとより好ましい。酸化亜鉛としては、従来公知のものを使用でき、例えば、三井金属鉱業(株)、東邦亜鉛(株)、ハクスイテック(株)、正同化学工業(株)、堺化学工業(株)等の製品を使用できる。
ゴム組成物は、ワックスを含むことが好ましい。ワックスの含有量は、ゴム成分100質量部に対して、例えば、0.5~20質量部、好ましくは1.0~15質量部、より好ましくは1.5~10質量部であり、2質量部以上であるとより好ましい。
ゴム組成物は、硫黄等の架橋剤を含むことが好ましい。架橋剤の含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、10.0質量部未満であり、2質量部以上であるとより好ましい。
ゴム組成物には、前記成分の他、タイヤ工業において一般的に用いられている添加剤、例えば、脂肪酸金属塩、カルボン酸金属塩、有機過酸化物等を更に配合してもよい。これらの添加剤の含有量は、ゴム成分100質量部に対して、例えば、0.1質量部超、200質量部未満である。
前記ゴム組成物は、一般的な方法、例えば、ゴム成分とカーボンブラック等のフィラーとを混練するベース練り工程と、前記ベース練り工程で得られた混練物と架橋剤とを混練する仕上げ練り工程とを含む製造方法により作製される。
本開示のタイヤは、前記仕上げ練り工程を経て得られた未加硫ゴム組成物を用いて通常の方法で製造される。すなわち、未加硫ゴム組成物を、サイドウォールの形状にあわせて押出し加工し、他のタイヤ部材と共に、タイヤ成型機上にて通常の方法で成形することにより、まず、未加硫タイヤを作製する。
本実験においては、175サイズのタイヤを作製し、評価した。
最初に、サイド部を形成するゴム組成物の製造を行った。
まず、以下に示す各配合材料を準備した。
(イ)NR:TSR20
(ロ)BR-1:宇部興産(株)製のUBEPOL-BR150B
(シス含量:97質量%)
(ハ)BR-2:日本ゼオン(株)製のNipol-BR1250H
(スズ末端変性BR、シス含量:40質量%)
(ニ)BR-3:宇部興産(株)製のUBEPOL VCR617
(シス含量:98質量%)
(イ)カーボンブラック:キャボットジャパン(株)製のショウブラックN550
(N2SA:42m2/g)
(ロ)オイル:(株)ジャパンエナジー製のプロセスX-140
(ハ)ステアリン酸:日油(株)製のステアリン酸「椿」
(ニ)酸化亜鉛:三井金属鉱業社製の亜鉛華1号
(ホ)ワックス:大内新興化学(株)製のサンノックワックス
(ヘ)老化防止剤-1:大内新興化学工業(株)製のノクラック 6C
(N-フェニル-N'-(1,3-ジメチルブチル)-p-フェニレンジアミン)
(ト)老化防止剤-2:川口化学工業(株)製のアンテージRD
(2,2,4-トリメチル-1,2-ジヒドロキノリン)
(チ)架橋剤および加硫促進剤
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラー NS
(N-tert-ブチル-2-ベンゾチアゾリルスルフェンアミド)
表1および表2に示す各配合内容に従い、バンバリーミキサーを用いて、硫黄および加硫促進剤以外の材料を150℃の条件下で5分間混練りして、混練物を得た。なお、各配合量は、質量部である。
得られたゴム組成物を用いて、表1および表2に示す厚みS(mm)にサイド部材を成形し、他のタイヤ部材と共に貼り合わせて未加硫タイヤを形成し、170℃の条件下で10分間プレス加硫して、サイズが175タイプの各試験用タイヤ(実施例1-1~実施例1-5および比較例1-1~比較例1-5)を製造した。
その後、各試験用タイヤの外径Dt(mm)、断面幅Wt(mm)、断面高さHt(mm)、扁平率(%)を求めるとともに、仮想体積V(mm3)を求めた。併せて、各試験用タイヤのサイド部のゴム層から、タイヤ周方向が長辺となるように、長さ20mm×幅4mm×厚さ1mmで切り出して粘弾性測定用ゴム試験片を作製し、各ゴム試験片について、GABO社製のイプレクサーシリーズを用いて、70℃、初期歪5%、動歪1%、周波数10Hzの条件下でtanδ(70℃tanδ)を測定した。結果を、表1および表2に示す。
(1)高速走行時における転がり抵抗の評価
各試験用タイヤを車輌(国産のFF車、排気量2000cc)の全輪に装着させて、内圧が250kPaとなるように空気を充填した後、乾燥路面のテストコース上を、100km/hの速度で10km周回した後、アクセルを離し、アクセルをオフにしてから車両が止まるまでの距離を、高速走行時における転がり抵抗として計測した。
転がり抵抗=[(試験用タイヤの計測結果)/(比較例1-5の計測結果)]×100
各試験用タイヤを車輌(国産のFF車、排気量2000cc)の全輪に装着させて、内圧が250kPaとなるように空気を充填した後、過積載状態にて、乾燥路面のテストコース上を、50km/hの速度で10周走行し、80km/hの速度で路面に設けた凹凸に乗り上げる動きを繰り返し行った。そして、再度、50km/hの速度で周回を行い、その後、速度を徐々に上げて、ドライバーが異変を感じた時点における速度を計測した。
耐久性=[(試験用タイヤの計測結果)/(比較例1-5の計測結果)]×100
上記(1)、(2)の評価結果を合計して総合評価とした。
各評価の結果を、表1および表2に示す。
本実験においては、195サイズのタイヤを作製し、評価した。
本実験においては、225サイズのタイヤを作製し、評価した。
実験1~3の結果(表1~表6)より、175サイズ、195サイズ、225サイズ、いずれのサイズのタイヤにおいても、上記した(式1)および(式2)が満たされている場合、高速走行時における転がり抵抗が十分に低減され、さらに、耐久性が十分に改善された空気入りタイヤを提供できることが分かる。
次に、仮想体積Vと断面幅Wtの関係性に大きな差がない3種類(実施例4-1~実施例4-3)のタイヤを、同じ配合で作製し、同様に評価した。なお、ここでは、上記した高速走行時における転がり抵抗および耐久性の評価に加えて、乗り心地についても評価した。
乗り心地=[(試験用タイヤの評価合計点)/(実施例4-3の評価合計点)]×100
サイド部を有する空気入りタイヤであって、
タイヤ最大幅位置における前記サイド部のカーカスより半径方向外側のゴム層の厚みS(mm)が3mm以下であると共に、前記ゴム層の70℃、周波数10Hz、初期歪5%、動歪率1%の条件下で測定された損失正接(70℃tanδ)が、0.15以下であり、
正規リムに組み込み、内圧を250kPaとした際のタイヤの断面幅をWt(mm)、外径をDt(mm)とし、タイヤが占める空間の体積を仮想体積V(mm3)としたとき、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤである。
1700≦(Dt2×π/4)/Wt≦2827.4 ・・・(式1)
[(V+1.5×107)/Wt]≦2.88×105 ・・(式2)
下記(式3)を満足することを特徴とし、本開示(1)に記載の空気入りタイヤである。
[(V+2.0×107)/Wt]≦2.88×105 ・・(式3)
下記(式4)を満足することを特徴とし、本開示(2)に記載の空気入りタイヤである。
[(V+2.5×107)/Wt]≦2.88×105 ・・(式4)
正規リムに組み込み、内圧を250kPaとした際のタイヤの外径をDt(mm)、タイヤの断面高さHt(mm)としたとき、(Dt-2×Ht)が、470(mm)以上であることを特徴とし、本開示(1)から(3)のいずれかとの任意の組合せの空気入りタイヤである。
扁平率が、40%以上であることを特徴とし、本開示(1)から(4)のいずれかとの任意の組合せの空気入りタイヤである。
扁平率が、45%以上であることを特徴とし、本開示(5)に記載の空気入りタイヤである。
扁平率が、47.5%以上であることを特徴とし、本開示(6)に記載の空気入りタイヤである。
扁平率が、50%以上であることを特徴とし、本開示(7)に記載の空気入りタイヤである。
下記(式5)を満足することを特徴とし、本開示(1)から(8)のいずれかとの任意の組合せの空気入りタイヤである。
70℃tanδ×(V/Wt)×S≦80000 ・・・・(式5)
下記(式6)を満足することを特徴とし、本開示(9)に記載の空気入りタイヤである。
70℃tanδ×(V/Wt)×S≦60000 ・・・・(式6)
下記(式7)を満足することを特徴とし、本開示(10)に記載の空気入りタイヤである。
70℃tanδ×(V/Wt)×S≦40000 ・・・・(式7)
下記(式8)を満足することを特徴とし、本開示(11)に記載の空気入りタイヤである。
70℃tanδ×(V/Wt)×S≦35000 ・・・・(式8)
正規リムに組み込み、内圧を250kPaとした際のタイヤの外径をDt(mm)としたとき、Dtが、685(mm)未満であることを特徴とし、本開示(1)から(12)のいずれかとの任意の組合せの空気入りタイヤである。
前記断面幅Wt(mm)が、205mm未満であることを特徴とし、本開示(1)から(13)のいずれかとの任意の組合せの空気入りタイヤである。
前記断面幅Wt(mm)が、200mm未満であることを特徴とし、本開示(14)に記載の空気入りタイヤである。
乗用車用空気入りタイヤであることを特徴とし、本開示(1)から(15)のいずれかとの任意の組合せの空気入りタイヤである。
Claims (16)
- サイド部を有する空気入りタイヤであって、
タイヤ最大幅位置における前記サイド部のカーカスより半径方向外側のゴム層の厚みS(mm)が3mm以下であると共に、前記ゴム層の70℃、周波数10Hz、初期歪5%、動歪率1%の条件下で測定された損失正接(70℃tanδ)が、0.15以下であり、
正規リムに組み込み、内圧を250kPaとした際のタイヤの断面幅をWt(mm)、外径をDt(mm)とし、タイヤが占める空間の体積を仮想体積V(mm3)としたとき、下記(式1)および(式2)を満足することを特徴とする空気入りタイヤ。
1700≦(Dt2×π/4)/Wt≦2827.4 ・・(式1)
[(V+1.5×107)/Wt]≦2.88×105 ・(式2) - 下記(式3)を満足することを特徴とする請求項1に記載の空気入りタイヤ。
[(V+2.0×107)/Wt]≦2.88×105 ・(式3) - 下記(式4)を満足することを特徴とする請求項2に記載の空気入りタイヤ。
[(V+2.5×107)/Wt]≦2.88×105 ・(式4) - 正規リムに組み込み、内圧を250kPaとした際のタイヤの外径をDt(mm)、タイヤの断面高さHt(mm)としたとき、(Dt-2×Ht)が、470(mm)以上であることを特徴とする請求項1ないし請求項3のいずれか1項に記載の空気入りタイヤ。
- 扁平率が、40%以上であることを特徴とする請求項1ないし請求項4のいずれか1項に記載の空気入りタイヤ。
- 扁平率が、45%以上であることを特徴とする請求項5に記載の空気入りタイヤ。
- 扁平率が、47.5%以上であることを特徴とする請求項6に記載の空気入りタイヤ。
- 扁平率が、50%以上であることを特徴とする請求項7に記載の空気入りタイヤ。
- 下記(式5)を満足することを特徴とする請求項1ないし請求項8のいずれか1項に記載の空気入りタイヤ。
70℃tanδ×(V/Wt)×S≦80000 ・・・(式5) - 下記(式6)を満足することを特徴とする請求項9に記載の空気入りタイヤ。
70℃tanδ×(V/Wt)×S≦60000 ・・・(式6) - 下記(式7)を満足することを特徴とする請求項10に記載の空気入りタイヤ。
70℃tanδ×(V/Wt)×S≦40000 ・・・(式7) - 下記(式8)を満足することを特徴とする請求項11に記載の空気入りタイヤ。
70℃tanδ×(V/Wt)×S≦35000 ・・・(式8) - 正規リムに組み込み、内圧を250kPaとした際のタイヤの外径をDt(mm)としたとき、Dtが、685(mm)未満であることを特徴とする請求項1ないし請求項12のいずれか1項に記載の空気入りタイヤ。
- 前記断面幅Wt(mm)が、205mm未満であることを特徴とする請求項1ないし請求項13のいずれか1項に記載の空気入りタイヤ。
- 前記断面幅Wt(mm)が、200mm未満であることを特徴とする請求項14に記載の空気入りタイヤ。
- 乗用車用空気入りタイヤであることを特徴とする請求項1ないし請求項15のいずれか1項に記載の空気入りタイヤ。
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Citations (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4414370A (en) | 1981-01-09 | 1983-11-08 | S. C. Johnson & Son, Inc. | Process for continuous bulk copolymerization of vinyl monomers |
| JPS596207A (ja) | 1982-06-15 | 1984-01-13 | エス・シ−・ジヨンソン・アンド・サン・インコ−ポレ−テツド | バルク重合方法とポリマ−生成物 |
| US5010166A (en) | 1987-03-05 | 1991-04-23 | S. C. Johnson & Son, Inc. | Process and apparatus for producing polyol polymers and polyol polymers so produced |
| JPH0558805B2 (ja) | 1984-06-14 | 1993-08-27 | Nippon Steel Corp | |
| JPH08216629A (ja) * | 1994-12-16 | 1996-08-27 | Sumitomo Rubber Ind Ltd | 自動二輪車 |
| JP2006160106A (ja) * | 2004-12-08 | 2006-06-22 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ及びその製造方法 |
| JP2007313522A (ja) | 2006-05-23 | 2007-12-06 | Nissan Motor Co Ltd | プレス型およびプレス加工方法 |
| JP2008254619A (ja) * | 2007-04-06 | 2008-10-23 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2009202865A (ja) * | 2008-02-01 | 2009-09-10 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2010058782A (ja) * | 2008-08-07 | 2010-03-18 | Sumitomo Rubber Ind Ltd | タイヤ |
| JP2010195059A (ja) * | 2009-02-20 | 2010-09-09 | Bridgestone Corp | 二輪車用タイヤ及び二輪車用タイヤの製造方法 |
| JP2013169817A (ja) * | 2012-02-17 | 2013-09-02 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2013221052A (ja) * | 2012-04-13 | 2013-10-28 | Sumitomo Rubber Ind Ltd | サイドウォール又はクリンチ用ゴム組成物、及び空気入りタイヤ |
| JP2014218096A (ja) * | 2013-05-01 | 2014-11-20 | 住友ゴム工業株式会社 | 空気入りタイヤ |
| JP2015030428A (ja) * | 2013-08-06 | 2015-02-16 | 住友ゴム工業株式会社 | 空気入りタイヤ |
| JP2015033982A (ja) * | 2013-08-09 | 2015-02-19 | 住友ゴム工業株式会社 | 自動二輪車用タイヤ |
| WO2015159538A1 (ja) * | 2014-04-14 | 2015-10-22 | 株式会社ブリヂストン | 空気入りタイヤ |
| JP2016074283A (ja) * | 2014-10-03 | 2016-05-12 | 株式会社ブリヂストン | ランフラットタイヤ |
| JP2016074298A (ja) * | 2014-10-06 | 2016-05-12 | 住友ゴム工業株式会社 | タイヤ用のゴム組成物 |
| JP2016074408A (ja) * | 2015-06-18 | 2016-05-12 | 株式会社ブリヂストン | 乗用車用空気入りラジアルタイヤ |
| US20180122688A1 (en) * | 2015-07-31 | 2018-05-03 | International Business Machines Corporation | Enhancing robustness of soi substrate containing a buried n+ silicon layer for cmos processing |
| WO2018186367A1 (ja) | 2017-04-06 | 2018-10-11 | 株式会社ブリヂストン | ゴム組成物及びタイヤ |
| JP2018178034A (ja) | 2017-04-19 | 2018-11-15 | 株式会社ブリヂストン | ゴム組成物およびそれを用いたタイヤ |
| CN109627509A (zh) * | 2018-12-24 | 2019-04-16 | 贵州轮胎股份有限公司 | 一种低滚阻全钢子午轮胎的胎面胶料及其制备方法 |
| JP2019089911A (ja) | 2017-11-13 | 2019-06-13 | 株式会社ブリヂストン | タイヤ用ゴム組成物およびタイヤ |
| JP2019206643A (ja) | 2018-05-29 | 2019-12-05 | 横浜ゴム株式会社 | タイヤ用ゴム組成物の製造方法 |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4672410B2 (ja) * | 2005-03-28 | 2011-04-20 | 住友ゴム工業株式会社 | ラジアルタイヤ |
| JP2008254819A (ja) | 2008-07-28 | 2008-10-23 | Toray Ind Inc | 巻物輸送用資材 |
| BRPI0923820B1 (pt) * | 2008-12-26 | 2020-03-10 | Bridgestone Corporation | Pneumático |
| US10226966B2 (en) * | 2011-06-22 | 2019-03-12 | Bridgestone Corporation | Pneumatic radial tire for passenger vehicle, method for using the tire, and tire-rim assembly including the tire |
| US20160023514A1 (en) * | 2013-04-30 | 2016-01-28 | Bridgestone Corporation | Pneumatic radial tire for passenger vehicle |
| JP2014213836A (ja) * | 2013-04-30 | 2014-11-17 | 株式会社ブリヂストン | 乗用車用空気入りラジアルタイヤ |
| JP5783204B2 (ja) | 2013-05-01 | 2015-09-24 | トヨタ自動車株式会社 | 運転支援装置および運転支援方法 |
| US10507692B2 (en) | 2014-10-06 | 2019-12-17 | Sumitomo Rubber Industries, Ltd. | Rubber compound for tires, pneumatic tire, and an airless tire |
| JP6185451B2 (ja) * | 2014-12-01 | 2017-08-23 | 住友ゴム工業株式会社 | タイヤ |
| JP6824813B2 (ja) * | 2017-05-10 | 2021-02-03 | 住友ゴム工業株式会社 | 空気入りタイヤ |
| CN109863044B (zh) * | 2017-07-13 | 2020-04-17 | 住友橡胶工业株式会社 | 充气轮胎以及轮胎用橡胶组合物 |
| JP7450325B2 (ja) * | 2017-12-27 | 2024-03-15 | 住友ゴム工業株式会社 | トレッド用ゴム組成物及び空気入りタイヤ |
| JP7352126B2 (ja) * | 2018-11-06 | 2023-09-28 | 住友ゴム工業株式会社 | トレッドゴム組成物及び空気入りタイヤ |
-
2020
- 2020-08-04 JP JP2020132439A patent/JP6819027B1/ja active Active
- 2020-12-14 JP JP2020206830A patent/JP7459448B2/ja active Active
-
2021
- 2021-07-20 CN CN202180058517.4A patent/CN116096587B/zh active Active
- 2021-07-20 US US18/018,099 patent/US12257866B2/en active Active
- 2021-07-20 WO PCT/JP2021/027204 patent/WO2022030253A1/ja not_active Ceased
- 2021-07-20 EP EP21852260.5A patent/EP4177070A4/en active Pending
Patent Citations (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4414370A (en) | 1981-01-09 | 1983-11-08 | S. C. Johnson & Son, Inc. | Process for continuous bulk copolymerization of vinyl monomers |
| JPS596207A (ja) | 1982-06-15 | 1984-01-13 | エス・シ−・ジヨンソン・アンド・サン・インコ−ポレ−テツド | バルク重合方法とポリマ−生成物 |
| JPH0558805B2 (ja) | 1984-06-14 | 1993-08-27 | Nippon Steel Corp | |
| US5010166A (en) | 1987-03-05 | 1991-04-23 | S. C. Johnson & Son, Inc. | Process and apparatus for producing polyol polymers and polyol polymers so produced |
| JPH08216629A (ja) * | 1994-12-16 | 1996-08-27 | Sumitomo Rubber Ind Ltd | 自動二輪車 |
| JP2006160106A (ja) * | 2004-12-08 | 2006-06-22 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ及びその製造方法 |
| JP2007313522A (ja) | 2006-05-23 | 2007-12-06 | Nissan Motor Co Ltd | プレス型およびプレス加工方法 |
| JP2008254619A (ja) * | 2007-04-06 | 2008-10-23 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2009202865A (ja) * | 2008-02-01 | 2009-09-10 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2010058782A (ja) * | 2008-08-07 | 2010-03-18 | Sumitomo Rubber Ind Ltd | タイヤ |
| JP2010195059A (ja) * | 2009-02-20 | 2010-09-09 | Bridgestone Corp | 二輪車用タイヤ及び二輪車用タイヤの製造方法 |
| JP2013169817A (ja) * | 2012-02-17 | 2013-09-02 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
| JP2013221052A (ja) * | 2012-04-13 | 2013-10-28 | Sumitomo Rubber Ind Ltd | サイドウォール又はクリンチ用ゴム組成物、及び空気入りタイヤ |
| JP2014218096A (ja) * | 2013-05-01 | 2014-11-20 | 住友ゴム工業株式会社 | 空気入りタイヤ |
| JP2015030428A (ja) * | 2013-08-06 | 2015-02-16 | 住友ゴム工業株式会社 | 空気入りタイヤ |
| JP2015033982A (ja) * | 2013-08-09 | 2015-02-19 | 住友ゴム工業株式会社 | 自動二輪車用タイヤ |
| WO2015159538A1 (ja) * | 2014-04-14 | 2015-10-22 | 株式会社ブリヂストン | 空気入りタイヤ |
| JP2016074283A (ja) * | 2014-10-03 | 2016-05-12 | 株式会社ブリヂストン | ランフラットタイヤ |
| JP2016074298A (ja) * | 2014-10-06 | 2016-05-12 | 住友ゴム工業株式会社 | タイヤ用のゴム組成物 |
| JP2016074408A (ja) * | 2015-06-18 | 2016-05-12 | 株式会社ブリヂストン | 乗用車用空気入りラジアルタイヤ |
| US20180122688A1 (en) * | 2015-07-31 | 2018-05-03 | International Business Machines Corporation | Enhancing robustness of soi substrate containing a buried n+ silicon layer for cmos processing |
| WO2018186367A1 (ja) | 2017-04-06 | 2018-10-11 | 株式会社ブリヂストン | ゴム組成物及びタイヤ |
| JP2018178034A (ja) | 2017-04-19 | 2018-11-15 | 株式会社ブリヂストン | ゴム組成物およびそれを用いたタイヤ |
| JP2019089911A (ja) | 2017-11-13 | 2019-06-13 | 株式会社ブリヂストン | タイヤ用ゴム組成物およびタイヤ |
| JP2019206643A (ja) | 2018-05-29 | 2019-12-05 | 横浜ゴム株式会社 | タイヤ用ゴム組成物の製造方法 |
| CN109627509A (zh) * | 2018-12-24 | 2019-04-16 | 贵州轮胎股份有限公司 | 一种低滚阻全钢子午轮胎的胎面胶料及其制备方法 |
Non-Patent Citations (1)
| Title |
|---|
| TOA SYNTHETIC RESEARCH ANNUAL REPORT TREND2000, no. 3, pages 42 - 45 |
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| EP4177070A4 (en) | 2024-07-31 |
| EP4177070A1 (en) | 2023-05-10 |
| US20230286329A1 (en) | 2023-09-14 |
| JP7459448B2 (ja) | 2024-04-02 |
| JP2022029400A (ja) | 2022-02-17 |
| US12257866B2 (en) | 2025-03-25 |
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