WO2018070118A1 - Resin composition - Google Patents

Abstract

The present invention addresses the problem of providing a resin composition from which a molded article is obtained in which, while the transparency of a cyclic olefin resin is maintained, occurrence of flow marks is inhibited. The present invention provides a resin composition which contains a cyclic olefin resin, a fatty acid ester compound and/or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol antioxidant, and a phenyl acrylate compound, wherein the contained amount of the fatty acid metal salt is more than 0.02 parts by mass with respect to 100 parts by mass of the cyclic olefin resin.

Description

Resin composition

The present invention relates to a resin composition.

Conventionally, cyclic olefin-based resins have been suitably used as materials for optical components because of their high light transmittance and low optical distortion.

On the other hand, the cyclic olefin-based resin is likely to have linear irregularities (called flow marks) on the surface of the molded product during injection molding. The flow mark impairs the mirror finish of the molded product.

For example, Patent Document 1 discloses a method of suppressing the generation of a spray mark, which is a type of flow mark, in a molded product using an amorphous cyclic olefin resin.

JP 2009-209298 A

However, there is a need for a technology that can more efficiently suppress the generation of flow marks.

The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain a molded article in which the generation of a flow mark is suppressed while maintaining the transparency of the cyclic olefin resin. It is to provide a composition.

The present inventor has conducted extensive research to solve the above problems. As a result, it was found that the flow mark is caused by a cross-linked product generated during plasticization of the resin in the injection molding of the cyclic olefin resin. Furthermore, it was also found that the cross-linked product is generated by shear and friction that the pellets undergo when plasticizing the resin. As a result of further investigations, the inventors have found that the generation of the cross-linked product can be suppressed by blending a specific component together with the cyclic olefin resin, and the above-described problems can be solved, and the present invention has been completed. More specifically, the present invention provides the following.

(1) a cyclic olefin-based resin, a fatty acid ester-based compound and / or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol-based antioxidant, and a phenyl acrylate-based compound,
Content of the said fatty-acid metal salt is a resin composition which is more than 0.02 mass part with respect to 100 mass parts of said cyclic olefin resin.

(2) The resin composition according to (1), wherein the fatty acid ester compound is pentaerythritol tetrastearate.

(3) The resin composition according to (1) or (2), wherein the fatty acid amide compound is oleic acid amide and / or erucic acid amide.

(4) The resin composition according to any one of (1) to (3), wherein the fatty acid metal salt is zinc stearate.

(5) The hindered phenol-based antioxidant is pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], any of (1) to (4) The resin composition described in 1.

(6) The phenyl acrylate compound is 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate (1 ) To (5).

According to the present invention, there is provided a resin composition capable of obtaining a molded product in which the generation of flow marks is suppressed while the transparency of the cyclic olefin resin is maintained.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments. The present invention can be implemented with appropriate modifications within the scope of the object.

<Resin composition>
The resin composition of the present invention comprises a cyclic olefin resin, a fatty acid ester compound and / or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol antioxidant, and a phenyl acrylate compound, The content of the fatty acid metal salt is more than 0.02 parts by mass with respect to 100 parts by mass of the cyclic olefin resin.

As described above, the flow mark on the surface of the molded product is caused by a cross-linked product generated during plasticization of the resin in the injection molding of the cyclic olefin resin. Further, the cross-linked product is generated mechanochemically by shearing or friction performed to plasticize the resin. More specifically, when the resin pellets are subjected to shearing or friction, in the cyclic olefin resin, cleavage of the main chain or extraction of hydrogen atoms occurs, and radicals are generated in the polymer. As a result of coupling of the radicals, a crosslinked product is formed.

In order to suppress the occurrence of the cross-linked product, it is necessary to suppress the shearing force and frictional force applied to the resin pellets. Here, the shearing and friction of the resin pellets can be caused by contact between the resin pellets or contact between the resin pellets and a molding machine (particularly, a barrel wall surface or a screw). Therefore, the generation of flow marks can be suppressed by suppressing the shearing force and frictional force generated by these contacts. Moreover, when radicals are generated in the polymer, generation of flow marks can be suppressed by suppressing coupling of the generated radicals.

Thus, as a result of the study by the present inventors, it was found that the shearing force and frictional force generated by contact between resin pellets can be suppressed by blending a fatty acid ester compound and / or a fatty acid amide compound. It has been found that the shearing force and frictional force generated by the contact between the resin pellets and the barrel wall surface of the molding machine or a screw can be suppressed by blending the fatty acid metal salt. It has been found that radical coupling can be suppressed by hindered phenolic antioxidants and phenylacrylate compounds functioning as radical trappers.

Therefore, according to the resin composition of the present invention, a cyclic olefin resin, a fatty acid ester compound and / or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol antioxidant, a phenyl acrylate compound, As a result, a molded product in which the generation of flow marks is suppressed while maintaining the transparency of the cyclic olefin resin is obtained. Along with the cyclic olefin-based resin, the above components are combined and blended, and each component can be combined with the cyclic olefin-based resin singly or in combination with only a part, and a remarkable flow mark generation suppressing effect is obtained. Played. Hereinafter, each component in the resin composition will be described.

(Cyclic olefin resin)
The cyclic olefin resin in the present invention is not particularly limited as long as it is a polymer or copolymer containing a structural unit derived from a cyclic olefin in the main chain. For example, an addition polymer of a cyclic olefin or a hydrogenated product thereof, an addition copolymer of a cyclic olefin and an α-olefin, or a hydrogenated product thereof can be used. A cyclic olefin resin may be used individually by 1 type, and may be used in combination of 2 or more type.

In addition, examples of the cyclic olefin-based resin include those obtained by grafting and / or copolymerizing an unsaturated compound having a polar group in the polymer or the copolymer containing a structural unit derived from a cyclic olefin in the main chain. It is done.

Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, and a hydroxyl group. Examples of the unsaturated compound having a polar group include (meth) acrylic acid and maleic acid. Acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1-10) ester, alkyl maleate (carbon number 1-10) ester, (meth) acrylamide, (meta And 2-hydroxyethyl acrylate.

Further, as the copolymer used as the cyclic olefin resin in the present invention, a commercially available resin can be used. Examples of commercially available cyclic olefin-based resins include TOPAS (registered trademark) (manufactured by TOPAS Advanced Polymers), Apel (registered trademark) (manufactured by Mitsui Chemicals), Zeonex (registered trademark) (manufactured by Nippon Zeon), Examples include ZEONOR (registered trademark) (manufactured by ZEON Corporation), ARTON (registered trademark) (manufactured by JSR Corporation), and the like.

（式中、Ｒ^１～Ｒ^１２は、それぞれ同一でも異なっていてもよく、水素原子、ハロゲン原子、及び、炭化水素基からなる群より選ばれるものであり、
　Ｒ^９とＲ^１０、Ｒ^１１とＲ^１２は、一体化して２価の炭化水素基を形成してもよく、
　Ｒ^９又はＲ^１０と、Ｒ^１１又はＲ^１２とは、互いに環を形成していてもよい。
　また、ｎは、０又は正の整数を示し、
　ｎが２以上の場合には、Ｒ^５～Ｒ^８は、それぞれの繰り返し単位の中で、それぞれ同一でも異なっていてもよい。） Particularly preferred examples of the addition copolymer of cyclic olefin and α-olefin include [1] a structural unit derived from an α-olefin having 2 to 20 carbon atoms, and [2] represented by the following general formula (I). And a copolymer containing a structural unit derived from a cyclic olefin.

(Wherein R ¹ to R ¹² may be the same or different and are each selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group;
R ⁹ and R ¹⁰ , R ¹¹ and R ¹² may be integrated to form a divalent hydrocarbon group,
R ⁹ or R ¹⁰ and R ¹¹ or R ¹² may form a ring with each other.
N represents 0 or a positive integer;
When n is 2 or more, R ⁵ to R ⁸ may be the same or different in each repeating unit. )

[[1] α-olefin having 2 to 20 carbon atoms]
The α-olefin having 2 to 20 carbon atoms is not particularly limited. For example, the same ones as in JP2007-302722 can be mentioned. These α-olefins may be used singly or in combination of two or more. Of these, ethylene is most preferably used alone.

[[2] Cyclic olefin represented by general formula (I)]
The cyclic olefin represented by the general formula (I) will be described. R ¹ to R ¹² in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group. Specific examples of the cyclic olefin represented by the general formula (I) include those similar to those described in JP-A-2007-302722.

These cyclic olefins may be used singly or in combination of two or more. Among these, it is preferable to use bicyclo [2.2.1] hept-2-ene (common name: norbornene) alone.

[1] The polymerization method of the α-olefin having 2 to 20 carbon atoms and the cyclic olefin represented by [2] general formula (I) and the hydrogenation method of the obtained polymer are not particularly limited. Can be carried out according to a known method.

The polymerization catalyst used is not particularly limited, and a cyclic olefin resin can be obtained by a known method using a conventionally known catalyst such as a Ziegler-Natta, metathesis, or metallocene catalyst.

The glass transition point of the cyclic olefin resin is preferably 70 ° C. or higher and 190 ° C. or lower. If the glass transition point of cyclic olefin resin is 70 degreeC or more, it is preferable at the point that the molded article which has high transparency which can be used conveniently as an optical component is easy to be obtained. If the glass transition point of cyclic olefin resin is 190 degrees C or less, it is preferable at the point that the molded article which has the impact resistance which can be used conveniently as an optical component is easy to be obtained. The glass transition point of the cyclic olefin resin can be adjusted by adjusting the content of the cyclic olefin skeleton of the main chain. As the glass transition point, a value measured by a DSC method (method described in JIS K7121) under a temperature rising rate of 10 ° C./min is employed. As the cyclic olefin resin, two or more cyclic olefin resins having different glass transition points may be used in combination.

The content of the cyclic olefin resin in the resin composition is not particularly limited, but 60% by mass or more in the resin composition from the viewpoint that a molded product having high transparency that can be suitably used as an optical component is easily obtained. It is preferable that it is 70 mass% or more.

(Fatty acid ester compounds and fatty acid amide compounds)
Since the fatty acid ester compound and the fatty acid amide compound not only suppress the generation of flow marks by suppressing the contact between the resin pellets, but also have good compatibility with the cyclic olefin resin, the transparency of the resin composition The moldability can be improved without impairing the properties.

The fatty acid ester compound in the present invention is not particularly limited. For example, fatty acids having 12 to 32 carbon atoms (lauric acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, arachidic acid, behenic acid, etc.) and monohydric aliphatic alcohols (palmityl alcohol, stearyl alcohol, behenyl alcohol, etc.) Or a compound ester of an ester compound with a polyhydric aliphatic alcohol (glycerin, pentaerythritol, dipentaerythritol, sorbitan, etc.), a fatty acid, a polybasic organic acid, a monohydric aliphatic alcohol or a polyhydric aliphatic alcohol A compound or the like can be used.

Examples of the fatty acid ester compounds include cetyl palmitate, butyl stearate, stearyl stearate, stearyl citrate, glycerol monocaprylate, glycerol monocaprate, glycerol monolaurate, glycerol monopalmitate, and glycerol dipalmitate. Glycerol monostearate, glycerol distearate, glycerol tristearate, glycerol monooleate, glycerol dioleate, glycerol trioleate, glycerol monolinoleate, glycerol monobehenate, glycerol mono12-hydroxystearate, glycerol diester 12-hydroxystearate, glycerol tri-12-hydroxystearate, glycerol diacetomonostearate, glycerol citrate fatty acid Ester, pentaerythritol adipate stearate, montanic acid partially saponified esters, pentaerythritol tetrastearate, dipentaerythritol hexastearate, sorbitan tristearate, and the like.

The above fatty acid ester compounds may be used alone or in combination of two or more.

Among the above, pentaerythritol tetrastearate is particularly suitable because it is highly compatible with the cyclic olefin-based resin, easily maintains the transparency of the molded product, and easily suppresses the generation of flow marks.

The fatty acid amide compound in the present invention is not particularly limited. For example, a compound obtained by dehydration condensation of a fatty acid having 12 to 32 carbon atoms (lauric acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, arachidic acid, behenic acid, erucic acid, etc.) and an amine is used. Can do.

Examples of the fatty acid amide compound include lauric acid amide, palmitic acid amide, heptadecanoic acid amide, stearic acid amide, oleic acid amide, arachidic acid amide, behenic acid amide, erucic acid amide, and the like.

The above fatty acid amide compounds may be used singly or in combination of two or more.

Among the above, oleic acid amide and erucic acid amide can be particularly preferably used because they have high compatibility with the cyclic olefin-based resin, easily maintain the transparency of the molded product, and easily suppress the generation of flow marks. .

The resin composition of the present invention contains at least one of a fatty acid ester compound and a fatty acid amide compound, and may contain both. From the viewpoint that generation of flow marks is particularly easy to suppress, the resin composition of the present invention preferably contains a fatty acid amide compound.

The content of the fatty acid ester compound and the fatty acid amide compound in the resin composition is not particularly limited. The content of the fatty acid ester compound or the fatty acid amide compound is 0.1 parts by mass or more with respect to 100 parts by mass of the cyclic olefin resin from the viewpoint that the flow mark of the obtained molded product can be effectively reduced. Preferably, it is 0.4 mass part or more. Moreover, the content of the fatty acid ester compound or the fatty acid amide compound is 3.0 parts by mass or less with respect to 100 parts by mass of the cyclic olefin resin from the viewpoint that it is easy to maintain high transparency of the obtained molded product. Is preferable, and it is more preferable that it is 2.0 mass parts or less. When both the fatty acid ester compound and the fatty acid amide compound are contained in the resin composition, the effects of the present invention can be easily achieved if the total amount is within the above range.

(Fatty acid metal salt)
The fatty acid metal salt suppresses the generation of flow marks by suppressing the frictional force between the resin pellets and the molding machine or the like (particularly, the barrel wall surface or screw).

The fatty acid metal salt in the present invention is not particularly limited as long as it is a metal salt of a higher fatty acid (long chain fatty acid having 12 or more carbon atoms). For example, lithium stearate, magnesium stearate, calcium stearate, calcium laurate, calcium ricinoleate, strontium stearate, barium stearate, barium laurate, barium ricinoleate, cadmium stearate, cadmium laurate, cadmium ricinoleate, naphthenic acid Cadmium, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate, lead stearate, dibasic lead stearate, lead naphthenate and the like can be used.

Among the above, zinc stearate can be particularly preferably used because the resulting resin composition has excellent processability and a molded article having extremely excellent transparency can be easily obtained.

The content of the fatty acid metal salt in the resin composition is more than 0.02 parts by mass with respect to 100 parts by mass of the cyclic olefin resin. From the viewpoint that the flow mark of the obtained molded product can be more effectively reduced, it is preferably 0.025 parts by mass or more, and 0.100 parts by mass or more with respect to 100 parts by mass of the cyclic olefin resin. More preferred. Moreover, it is preferable that it is 2.000 mass parts or less with respect to 100 mass parts of cyclic olefin resin from the point that it is easy to maintain the high transparency of the molded article obtained, and it is 1.000 mass parts or less. More preferred.

(Hindered phenolic antioxidant)
The hindered phenol-based antioxidant suppresses the generation of flow marks by suppressing the coupling of radicals generated in the polymer. The injection molding of the cyclic olefin-based resin is performed by removing the dissolved oxygen by heating and deaerating (drying) the resin pellets before molding, and blocking the oxygen by purging nitrogen into the cylinder. Although there is little oxygen in the system, it is present in a trace amount, and radical coupling mediated by oxygen can occur (such as R00R). The hindered phenol-based antioxidant effectively captures radicals mediated by oxygen and suppresses coupling.

Examples thereof include a monocyclic hindered phenol compound, a polycyclic hindered phenol compound linked by a hydrocarbon group or a group containing a sulfur atom, a hindered phenol compound having an ester group or an amide group. Specific examples of these compounds include 2,6-di-t-butyl-p-cresol, 2,2′-methylenebis (4-methyl-6-t-butylphenol), 4,4′-methylenebis (2,6 -Di-t-butylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, 4,4'-butylidenebis (3-methyl-6-t-butylphenol) 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, 4,4′-thiobis (3-methyl-6-tert-butylphenol) ), N-octadecyl-3- (4′-hydroxy-3 ′, 5′-di-t-butylphenyl) propionate, n-octadecyl-2- (4′-hydroxy-3 ′, 5′-di-t) -Butyl Nyl) propionate, 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], ethylenebis (oxyethylene) bis [3- (3- (5- t-butyl-4-hydroxy-m-tolyl)) propionate], pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 3,9-bis [2- { 3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, di- n-octadecyl-3,5-di-t-butyl-4-hydroxybenzylphosphonate, N, N′-hexamethylenebis (3,5-di-t-butyl-4 Hydroxy) dihydrocinnamamide, N, N′-ethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionamide], N, N′-tetramethylenebis [3- (3 , 5-di-t-butyl-4-hydroxyphenyl) propionamide], N, N′-hexamethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionamide], N , N′-ethylenebis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionamide], N, N′-hexamethylenebis [3- (3-tert-butyl-5-methyl) -4-hydroxyphenyl) propionamide], N, N′-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] hydrazine, N, N′-bis [3 -(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionyl] hydrazine, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3 , 5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate and the like. The said component can be used individually or in combination of 2 or more types.

Of the above, pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] has excellent processability of the resulting resin composition and is a molded article with extremely excellent transparency. Since it is easy to obtain, it can be used particularly suitably.

Although content in the resin composition of a hindered phenolic antioxidant is not specifically limited, From the point that it is easy to reduce effectively the flow mark of the obtained molded article, with respect to 100 mass parts of cyclic olefin resin. The amount is preferably 0.1 parts by mass or more, and more preferably 0.3 parts by mass or more. Moreover, it is preferable that it is 2.0 mass parts or less with respect to 100 mass parts of cyclic olefin resin from the point that it is easy to maintain the high transparency of the molded article obtained, and it is 1.0 mass part or less. More preferred.

(Phenyl acrylate compounds)
The phenyl acrylate compound suppresses the generation of flow marks by suppressing the coupling of radicals generated in the polymer. The injection molding of the cyclic olefin-based resin is performed by removing the dissolved oxygen by heating and deaerating (drying) the resin pellets before molding, and blocking the oxygen by purging nitrogen into the cylinder. In this case, since there is little oxygen in the system, the radical coupling is a coupling between alkyl radicals (R.) (that is, RR is generated). The phenyl acrylate compound can effectively capture the alkyl radical (R ·) and suppress coupling.

Examples of the phenyl acrylate compound in the present invention include 2-t-butyl-6- (3′-t-butyl-5′-methyl-2′-hydroxybenzyl) -4-methylphenyl acrylate, 2- [1 Examples include-(2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate and the like. The said component can be used individually or in combination of 2 or more types.

Among the above, 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate has the processability of the resulting resin composition. Since it is easy to obtain a molded article that is excellent and extremely excellent in transparency, it can be particularly preferably used.

The content of the phenyl acrylate-based compound in the resin composition is not particularly limited, but is 0.1% with respect to 100 parts by mass of the cyclic olefin-based resin from the viewpoint of easily reducing the flow mark of the obtained molded product. The amount is preferably at least part by mass, and more preferably at least 0.3 part by mass. Moreover, it is preferable that it is 2.0 mass parts or less with respect to 100 mass parts of cyclic olefin resin from the point that it is easy to maintain the high transparency of the molded article obtained, and it is 1.0 mass part or less. More preferred.

(Other ingredients)
In the resin composition of the present invention, a resin other than the cyclic olefin resin (styrenic elastomers such as SEBS, SEPS, SIBS, and SEEPS) and other known additives (within a range not impairing the object of the present invention) A hindered amine light stabilizer, an ultraviolet light absorber, a flame retardant, a sulfur stabilizer, a metal extractant, etc.) may be added. The kind and amount of the additive can be appropriately adjusted according to the effect to be obtained.

<Method for producing resin composition>
The manufacturing method of the resin composition of this invention is not specifically limited, The method normally used in manufacture of a resin composition is employable. For example, the method of melt-kneading each component mix | blended with a resin composition collectively or sequentially is mentioned. As a method of melt-kneading, for example, after blending each component blended in the resin composition, a method of melt-kneading with a uniaxial or biaxial extruder (screw extruder, etc.), a Banbury mixer, a roll, various kneaders, etc. Etc. The temperature in the melt-kneading is not particularly limited as long as each component blended in the resin composition is melted, but it is generally performed in a temperature range of 160 ° C. to 350 ° C., preferably 180 ° C. to 300 ° C. Is.

For example, the resin composition of the present invention may be prepared by mixing components constituting the resin composition of the present invention at a time. Or you may mix the masterbatch containing the component which comprises the resin composition of this invention with base resin containing cyclic olefin resin etc., and may prepare the composition of this invention. Furthermore, a target blend may be obtained by directly feeding a dry blend of components constituting the resin composition of the present invention into a molding machine.

<Molded product obtained from resin composition>
In the molded product obtained from the resin composition of the present invention, the occurrence of flow marks is suppressed while the transparency of the cyclic olefin resin is maintained. Examples of the method for producing a molded product include injection molding, extrusion molding, and blow molding. The molded product is preferably manufactured by injection molding from the viewpoint that the effect of the present invention, that is, suppression of the generation of flow marks, is easily achieved.

The use of the molded product obtained from the resin composition of the present invention is not particularly limited, but since the molded product has excellent transparency and the occurrence of flow marks is suppressed, it can be used in optical parts and medical supplies. It can be used suitably. For optical parts and medical parts, for molding light guide plates, pickup lenses, camera lenses, LED lenses, f-theta lenses, prism lenses, projector lenses, resin mirrors, lamp covers, resin windows, lenses and disk-shaped recording media Resin molds, syringes, vials, bottles, cuvettes, microtiter plates, and the like.

The transparency of the molded product obtained from the resin composition of the present invention can be evaluated by specifying the total light transmittance by the method shown in the Examples. Generation | occurrence | production of the flow mark in the molded article obtained from the resin composition of this invention can be evaluated by specifying a haze value by the method shown in the Example.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples.

<Production of resin composition-1>
The following raw material components were put into a twin screw extruder, melt kneaded, and a pelletized resin composition was obtained. The amount of each component is as shown in Tables 1 and 2. The compounding quantity of each component was shown as a mass part with respect to 100 mass parts of cyclic olefin resin.

(Raw material ingredients)
Cyclic olefin resin: Trade name “5013S-04” (manufactured by TOPAS Advanced Polymers, addition copolymer of norbornene and ethylene, glass transition point 138 ° C.)
Pentaerythritol tetrastearate (corresponding to a fatty acid ester compound): Oleic acid amide (corresponding to a fatty acid amide compound) manufactured by NOF Corporation: Erucic acid amide (corresponding to a fatty acid amide compound) manufactured by Kao Corporation : Hindered phenol antioxidant manufactured by Kao Corporation: Trade name “IRGANOX 1010”, Phenyl acrylate compound manufactured by BASF Japan Ltd .: Trade name “SUMILIZER (registered trademark) GS”, Zinc stearate (Sumitomo Chemical Co., Ltd.) Equivalent to fatty acid metal salt.): NOF Corporation

(Production conditions for the resin composition)
Twin screw extruder: Trade name “TEX30C”, manufactured by Nippon Steel Works, Ltd. Cylinder temperature: 260 ° C.
Screw rotation speed: 200rpm
Extrusion rate: 15 kg / hour

<Manufacture of molded body>
Each resin composition obtained above was molded under the following conditions to obtain test pieces. The haze value and total light transmittance of the obtained test piece were measured. The results are shown in Tables 1 and 2.

The haze value is an indicator of whether or not a flow mark is generated on the surface of the molded product. Specifically, the lower the haze value, the more the occurrence of flow marks is suppressed. The total light transmittance is an index of transparency of a molded product. Specifically, the higher the total light transmittance, the higher the transparency.

(Molding condition)
Test piece: 70 mm × 70 mm × 2 mmt flat plate Molding machine: Trade name “SE75D”, manufactured by Sumitomo Heavy Industries, Ltd. Cylinder temperature: 260 ° C.
Screw rotation speed: 50rpm
Back pressure: 10MPa
Injection speed: 100mm / sec
Holding pressure: 60 MPa
Mold temperature: 80 ℃

(Measurement of haze value)
In accordance with JIS-K7361-1, measurement was performed using a haze meter (trade name “HAZE-GARDII”, manufactured by Toyo Seiki Seisakusho Co., Ltd.), and the following formula was used.
Haze value (%) = diffuse transmittance (%) / total light transmittance (%)

(Measurement of total light transmittance)
In accordance with JIS-K7361-1, a haze meter (trade name “HAZE-GARDII”, manufactured by Toyo Seiki Seisakusho Co., Ltd.) was used. The total light transmittance was specified as an average value obtained by measuring the four corners and the center of the test piece.

As shown in Table 1, the molded products obtained from the resin compositions of the examples had low haze values and high total light transmittance. That is, the molded product was suppressed in the generation of flow marks while having high transparency. When the fatty acid amide compound was contained in the resin composition, the haze value was particularly low, and the generation of flow marks was well suppressed.

On the other hand, as shown in Table 2, the molded product obtained from the resin composition of the comparative example not satisfying the requirements of the resin composition of the present invention had high total light transmittance and haze value. That is, although the molded body had transparency, a flow mark was generated.

Further, from comparison between Examples 2 and 3 and Comparative Example 9, when the zinc stearate is 0.02 parts by mass with respect to 100 parts by mass of the cyclic olefin resin, the haze value becomes high, and the flow mark is It turns out that it occurs.

As understood from a comparison between Examples and Comparative Examples, together with a cyclic olefin resin, a fatty acid ester compound or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol antioxidant, a phenyl acrylate compound, When combined, the effect of suppressing the occurrence of flow marks is exhibited, and when these components are blended alone or in combination with only a part thereof, such a suppressive effect is not sufficiently exhibited.

<Production of resin composition-2>
The following raw material components were put into a twin screw extruder, melt kneaded, and a pelletized resin composition was obtained. The blending amount of each component is as shown in Tables 3 and 4. The compounding quantity of each component was shown as a mass part with respect to 100 mass parts of cyclic olefin resin.

(Raw material ingredients)
Cyclic olefin resin: Trade name “5013S-04” (manufactured by TOPAS Advanced Polymers, addition copolymer of norbornene and ethylene, glass transition point 138 ° C.)
Cyclic olefin resin: Trade name “8007S-04” (manufactured by TOPAS Advanced Polymers, addition copolymer of norbornene and ethylene, glass transition point 78 ° C.)
Pentaerythritol tetrastearate (corresponding to a fatty acid ester compound): Oleic acid amide (corresponding to a fatty acid amide compound) manufactured by NOF Corporation: Erucic acid amide (corresponding to a fatty acid amide compound) manufactured by Kao Corporation : Hindered phenol antioxidant manufactured by Kao Corporation: Trade name “IRGANOX 1010”, Phenyl acrylate compound manufactured by BASF Japan Ltd .: Trade name “SUMILIZER (registered trademark) GS”, Zinc stearate (Sumitomo Chemical Co., Ltd.) Equivalent to fatty acid metal salt.): NOF Corporation

(Production conditions for the resin composition)
Twin screw extruder: Trade name “TEX30C”, manufactured by Nippon Steel Works, Ltd. Cylinder temperature: 260 ° C.
Screw rotation speed: 200rpm
Extrusion rate: 15 kg / hour

<Manufacture of molded body>
Each resin composition obtained above was molded under the following conditions to obtain test pieces. The haze value and total light transmittance of the obtained test piece were measured in the same manner as in <Production of resin composition-1>. The results are shown in Tables 3 and 4.

(Molding condition)
Test piece: 70 mm × 70 mm × 2 mmt flat plate Molding machine: Trade name “SE75D”, manufactured by Sumitomo Heavy Industries, Ltd. Cylinder temperature: 270 ° C.
Screw rotation speed: 300rpm
Back pressure: 10MPa
Injection speed: 150mm / sec
Holding pressure: 60 MPa
Mold temperature: 40 ℃

As shown in Table 3, even when two types of cyclic olefin resins having different glass transition points were blended, the molded bodies obtained from the resin compositions of the examples had a low haze value and a total light beam. The transmittance was high. That is, the molded product was suppressed in the generation of flow marks while having high transparency.

On the other hand, as shown in Table 4, the molded product obtained from the resin composition of the comparative example not satisfying the requirements of the resin composition of the present invention had high total light transmittance and haze value. That is, although the molded body had transparency, a flow mark was generated.

Claims (6)

A cyclic olefin-based resin, a fatty acid ester-based compound and / or a fatty acid amide compound, a fatty acid metal salt, a hindered phenol-based antioxidant, and a phenyl acrylate-based compound,
Content of the said fatty-acid metal salt is a resin composition which is more than 0.02 mass part with respect to 100 mass parts of said cyclic olefin resin. The resin composition according to claim 1, wherein the fatty acid ester compound is pentaerythritol tetrastearate. The resin composition according to claim 1 or 2, wherein the fatty acid amide compound is oleic acid amide and / or erucic acid amide. The resin composition according to any one of claims 1 to 3, wherein the fatty acid metal salt is zinc stearate. 5. The resin composition according to claim 1, wherein the hindered phenol-based antioxidant is pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]. object. 6. The phenyl acrylate compound is 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate. The resin composition in any one of.