WO2021187509A1 - 筐体用積層体 - Google Patents
筐体用積層体 Download PDFInfo
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- WO2021187509A1 WO2021187509A1 PCT/JP2021/010750 JP2021010750W WO2021187509A1 WO 2021187509 A1 WO2021187509 A1 WO 2021187509A1 JP 2021010750 W JP2021010750 W JP 2021010750W WO 2021187509 A1 WO2021187509 A1 WO 2021187509A1
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- WO
- WIPO (PCT)
- Prior art keywords
- housing
- laminate
- coating layer
- base material
- polycarbonate
- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/20—Esters of polyhydric alcohols or polyhydric phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F22/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
- C08F22/10—Esters
- C08F22/12—Esters of phenols or saturated alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/0017—Casings, cabinets or drawers for electric apparatus with operator interface units
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2333/12—Homopolymers or copolymers of methyl methacrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
Definitions
- the present invention relates to a housing laminate having excellent characteristics for a housing of a mobile communication device typified by a smartphone.
- the plastic housing has the disadvantage that the surface is easily scratched and the appearance is inferior to the glass housing and the metal housing. Therefore, a method of providing a coating on the surface of the plastic housing is used. Many acrylic resins are used for such coatings, and they exhibit excellent surface hardness (steel wool resistance) by being photocured by irradiation with active light.
- Patent Document 1 proposes a method of transferring a hard coat layer having functionality in order to satisfy scratch resistance.
- Patent Documents 2 to 4 by using a silicon compound, steel wool resistance is obtained by slipperiness, releasability, flexibility (flexibility) and stress relaxation.
- the present invention is a laminate used for a housing having a coating layer on a polycarbonate base material or a base material which is a composite plate made of polymethylmethacrylate and polycarbonate, and the following conditions 1 and 2 It is a laminated body for a housing characterized by satisfying the above conditions.
- Condition 1 The relationship between the relative permittivity Dk and the dielectric loss tangent Df measured by the split post dielectric resonator method in the frequency band of 5 GHz or higher satisfies the following equation. Df ⁇ ( ⁇ Dk) ⁇ 0.02
- Condition 2 No scratches are visually confirmed after 300 reciprocations of # 0000 steel wool with a load of 1.5 kg / cm 2 with respect to the coating layer.
- the present invention it is possible to provide a laminate for a housing that is scratch resistant and has low dielectric loss characteristics in a frequency band of 5 GHz or higher.
- the housing laminate of the present invention has a coating layer on the base material, and the base material is a polycarbonate base material or a composite plate composed of polymethylmethacrylate and polycarbonate.
- the dielectric loss of the laminate is obtained by the following equation from the relative permittivity Dk, the dielectric loss tangent Df, and the signal frequency f.
- Dielectric loss k ⁇ f ⁇ Df ⁇ ( ⁇ Dk) (K: constant, f: signal frequency, Df: dielectric loss tangent, Dk: relative permittivity) Therefore, it is necessary to keep Df ⁇ ( ⁇ Dk) low in order to use it in the high frequency region.
- Df ⁇ ( ⁇ Dk) is ⁇ 0.02, preferably ⁇ 0.015, more preferably ⁇ 0.015, for Dk and Df measured by the split post dielectric resonator method in the frequency band of 5 GHz or higher. ⁇ 0.012. Within the range of Df ⁇ ( ⁇ Dk), it can be used as a laminated body for a housing without any problem even in high frequency band communication.
- the split post dielectric resonator method is one of the methods capable of accurately measuring the relative permittivity Dk and the dielectric loss tangent Df in the frequency band of 1 GHz to 20 GHz.
- This measurement is a kind of resonance method, and there is a space to insert the substrate to be measured in the center of the resonator, and the resonance frequency before and after inserting the substrate to be measured is obtained in this space.
- the relative permittivity Dk and the dielectric positive contact Df can be measured.
- the resonator used is one that conforms to IEC-61189.
- the thickness of the polycarbonate base material which is the base material of the present invention or the base material which is a composite plate composed of polymethylmethacrylate and polycarbonate is 0.4 mm to 2.0 mm. This may cause problems with the durability of the laminate if the thickness of the supporting base material is less than 0.4 mm, and may cause problems with the workability and transparency of the base material if it exceeds 2.0 mm. Because there is.
- the thickness of the base material also affects the dielectric properties, but if it is within this thickness range, Df ⁇ ( ⁇ Dk), which affects the dielectric loss of the housing laminate, does not exceed 0.02.
- the coating layer thicker in order to obtain the desired steel wool resistance, but a composite composed of polymethylmethacrylate and polycarbonate having a higher surface hardness.
- the coating layer is a cured product of the following photocurable resin composition.
- the photocurable resin composition forming the coating layer is preferably composed of (a) a photocurable compound, (b) a photopolymerization initiator and (c) a solvent.
- the photocurable compound of the component (a) preferably contains a photocurable polyfunctional monomer represented by the following formula (1) or (2) as an essential component.
- the crosslink density at the time of curing becomes high, and as a result, steel wool resistance can be satisfied. If the above (1) or (2) is not included, the crosslink density at the time of curing is insufficient, and it becomes difficult to satisfy the steel wool resistance, which is not preferable.
- the photocurable compound of the component (a) preferably has an acrylic molar number in the range of 0.8 to 1.1 per 100 g, preferably 0.9 to 1.1, and more preferably 0.95 to 1.05. The range. If the number of acrylic moles is less than 0.8, the crosslink density may be low and the scratch resistance may be lowered. On the other hand, if it is larger than 1.1, cracks due to excessive stress may occur due to shrinkage during curing, which may cause poor appearance.
- the number of moles of acrylic per 100 g indicates the total number of moles of acrylic (number of acrylic functional groups / molecular weight g ⁇ mol -1) of each component per 100 g of the photocurable compound.
- the photocurable compound of the component (a) has three or more (meth) acrylic groups in the molecule. If it is less than 75 wt%, the crosslink density decreases, and it is difficult to satisfy the steel wool resistance.
- Compounds having three or more (meth) acrylic groups in the molecule include pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane triacrylate, dimethylolpropanetetraacrylate, and trimethylolpropaneethylene oxide modification.
- Examples thereof include triacrylate, trimethylolpropane propylene oxide modified triacrylate, pentaerythritol ethylene oxide modified tetraacrylate, dipentaerythritol ethylene oxide modified pentaacrylate, dipentaerythritol ethylene oxide modified hexaacrylate, and tris (2-acryloyloxyethyl) isocyanurate.
- the photocurable compound of the component (a) preferably has a number of moles of hydroxyl groups per 100 g in the range of 0.06 to 0.20, preferably 0.07 to 0.15, and more preferably 0.08 to 0.12. Is the range of. If it is less than this range, the elastic modulus is lowered, and the desired steel wool resistance may not be obtained. On the contrary, even if it is contained beyond this range, further improvement cannot be expected.
- the number of moles of hydroxyl groups per 100 g indicates the total number of hydroxyl groups (number of hydroxyl groups / molecular weight g ⁇ mol -1) of each component per 100 g of the photocurable compound.
- hydroxyl group-containing (meth) acrylate 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2- (Meta) Acryloyloxyethyl-2-hydroxyethyl-phthalic acid, glycerindi (meth) acrylate, 2-hydroxy-3- (meth) acryloyloxypropyl (meth) acrylate, pentaerythritol triacrylate, dipentaerythritol penta Examples include acrylate. Among them, those having three or more functionalities are preferable.
- the photocurable compound of the component (a) in order to adjust the number of moles of acrylic and the number of moles of hydroxyl groups per 100 g, two or less acrylates can be contained in the molecule.
- the compound containing two or less acrylates in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol di ().
- examples thereof include meta) acrylate, tetraethylene glycol dimethacrylate, and dicyclopentanyl dimethylol di (meth) acrylate.
- the photocurable compound of the component (a) may contain urethane-modified (meth) acrylates and ethylene oxide-modified (meth) acrylates. These are effective in suppressing cracks generated by shrinkage during curing.
- Examples of the (b) photopolymerization initiator of the photocurable resin composition include benzoins such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, and benzoin isobutyl ether; acetophenone, 2,2-diethoxy-2- Phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, 2-hydroxy-2-methyl-phenylpropane-1-one, diethoxyacetophenone, 1-hydroxycyclohexylphenylketone, 2-methyl Acetophenones such as -1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one; anthraquinones such as 2-ethylanthraquinone, 2-tersary butyl anthraquinone, 2-chloroanthraquinone, 2-amylanthraquinone Thioxan
- components (b) can be used alone or as a mixture of two or more kinds, and further, tertiary amines such as triethanolamine and methyldiethanolamine, N, N-dimethylaminobenzoic acid ethyl ester, N, N-dimethylamino. It can be used in combination with an accelerator such as a benzoic acid derivative such as benzoic acid isoamyl ester.
- tertiary amines such as triethanolamine and methyldiethanolamine, N, N-dimethylaminobenzoic acid ethyl ester, N, N-dimethylamino.
- an accelerator such as a benzoic acid derivative such as benzoic acid isoamyl ester.
- the amount of the photopolymerization initiator used as the component (b) is preferably 0.1 to 20 wt%, more preferably 1 to 10 wt% with respect to the total 100 wt% of the component (a). If it is less than this range, the cross-linking becomes insufficient, the elastic modulus decreases, and the desired steel wool resistance may not be obtained. On the contrary, even if the content exceeds this range, further improvement in the reaction rate may not be expected.
- Examples of the solvent of the component (c) include aromatic organic solvents such as toluene and xylene, ketone organic solvents such as methyl ethyl ketone and methyl isobutyl ketone, and ester organic solvents such as ethyl acetate, n-propyl acetate, isopropyl acetate and isobutyl acetate.
- Solvents alcohol-based organic solvents such as methanol, ethanol, n-propanol, isopropanol, n-butanol, etc.
- Known organic solvents such as glycol ether-based organic solvents such as propylene glycol monomethyl ether can be used. In particular, it is preferable to contain a glycol-based organic solvent.
- glycol ether-based organic solvent examples include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol dipropyl ether, and ethylene.
- Ethylene glycol ethers such as glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol dibutyl ether, ethylene glycol isoamyl ether, ethylene glycol monohexyl ether, ethylene glycol mono2-ethylhexyl ether, methoxyethoxyethanol, ethylene glycol monoallyl ether,
- propylene glycols such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether and butoxypropanol, and propylene glycol monomethyl ether is preferable.
- the thickness of the coating layer is preferably 1 to 30 ⁇ m. More preferably, it is 5 ⁇ m to 20 ⁇ m. If it is less than 1 ⁇ m, it is easily affected by the supporting base material, and the desired steel wool resistance may not be obtained. On the contrary, if it exceeds this range, cracks due to excessive stress may occur due to shrinkage during curing, which may cause poor appearance. Further, within this range, Df ⁇ ( ⁇ Dk), which affects the dielectric loss of the housing laminate, does not exceed 0.02.
- additives can be added to the photocurable resin composition within a range not deviating from the object of the present invention.
- Various additives such as organic / inorganic fillers, slip agents, plasticizers, flame retardants, heat stabilizers, antioxidants, light stabilizers, UV absorbers, lubricants, antistatic agents, mold release agents, foaming agents, nucleating agents, Examples thereof include colorants, cross-linking agents, dispersion aids, resin components and the like.
- the photocurable resin composition can be cured by irradiating it with ultraviolet rays having a wavelength of 10 to 400 nm or visible light having a wavelength of 400 to 700 nm.
- the wavelength of light used is not particularly limited, but near-ultraviolet rays having a wavelength of 200 to 400 nm are particularly preferably used.
- Lamps used as ultraviolet sources include low-pressure mercury lamps (output: 0.4 to 4 W / cm), high-pressure mercury lamps (40 to 160 W / cm), ultra-high pressure mercury lamps (173 to 435 W / cm), and metal halide lamps. (80 to 160 W / cm) and the like can be exemplified.
- the method for obtaining the coating film by light irradiation may be either in an oxygen blocking atmosphere or in an air atmosphere, but the composition of the present invention can provide a good coating even when polymerized and cured in an air atmosphere.
- Examples thereof include a salivation method, a roller coating method, a bar coating method, a spray coating method, an air knife coating method, a spin coating method, a flow coating method, a curtain coating method and a dipping method.
- Regarding the coating film thickness It is adjusted by the solid content concentration in consideration of the molding film thickness after drying and curing.
- a photocurable resin composition A1 for a coating film 8 parts by weight of Polymerd 907) manufactured by the same company, propylene glycol monomethyl ether as an organic solvent was adjusted so as to have a solid content of 40% to obtain a photocurable resin composition A1 for a coating film.
- rice field. Among the constituent components of the photocurable compound, the ratio of those having a trifunctional or higher (meth) acrylic group was 100%.
- Photocurable resin compositions A2 to A4 and B1 to B4 for coating films were obtained in the same procedure as in Reference Example 1 except that the raw materials and composition ratios shown in Table 1 were used. Other abbreviations in the table are as follows.
- Examples 1 and 2 ⁇ Manufacturing of laminated bodies S1 and S2 for housing>
- the above photocurable resin composition A1 is placed on a polycarbonate base material (thickness 0.54 mm, length 10 cm, width 10 cm, manufactured by Escalbo Sheet Co., Ltd.) and dried by a spin coating method to have film thicknesses of 10 ⁇ m (S1) and 20 ⁇ m (thickness: 0.54 mm) and 20 ⁇ m (thickness).
- the coating was applied so as to be S2), dried at 80 ° C. for 5 minutes, and then cooled at room temperature for 5 minutes.
- Laminates S3 to S8 for housing were prepared in the same procedure as in Examples 1 and 2 except that the photocurable resin compositions A2 to A4 blended in the composition ratios shown in Table 1 were used.
- Laminates T3 to T4 for housing were prepared in the same procedure as in Examples 9 and 10, except that the photocurable resin composition A2 blended in the composition ratios shown in Table 1 was used.
- Comparative Examples 1, 2, 3 Gorilla glass without a coating layer (reinforced product, manufactured by Corning Inc.), polycarbonate without a coating layer, and polymethylmethacrylate / polycarbonate composite plate without a coating layer were designated as Comparative Examples 1, 2, and 3, respectively. ..
- Laminates U1 to U8 for housing were prepared in the same procedure as in Examples 9 and 10, except that the photocurable resin compositions B1 to B4 blended in the composition ratios shown in Table 1 were used.
- a scratch with a length of 1 mm or more was judged to be a scratch, and the presence or absence of the scratch was visually observed under a fluorescent lamp, and the number of scratches was evaluated according to the following criteria. ⁇ : No scratches ⁇ : Less than 10 scratches ⁇ : 10 or more scratches
- ⁇ Permittivity Df, Dissipation factor Dk, Df ⁇ ( ⁇ Dk)> A sample that has been allowed to stand for 24 hours or more in an atmosphere of 23 ° C. and 50% RH is subjected to a frequency of 5 GHz and 10 GHz by a split-post dielectric resonator method using an Agilent Technologies E8363C in an atmosphere of 23 ° C. Dielectric constant Df and dielectric loss tangent Dk were measured. Moreover, Df ⁇ ( ⁇ Dk) was calculated from the obtained numerical value.
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- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
Description
通信機器においては、通信速度、送受信データ量の増大に対応しミリ波など高周波帯域における通信手段が現実となってきており、データ送受信におけるノイズ、誘電損失などによる通信エラーの低減が緊急の課題となっている。
条件1:5GHz以上の周波数帯においてスプリットポスト誘電体共振器法により測定された比誘電率Dk及び誘電正接Dfの関係が以下の式を満たすこと。
Df×(√Dk)<0.02
条件2:コーティング層に対して#0000のスチールウールを1.5kg/cm2荷重で300往復させた後に目視で傷が確認されないこと。
誘電損失=k×f×Df×(√Dk)
(k:定数, f:信号の周波数, Df:誘電正接, Dk:比誘電率)
そのため、高周波領域で使用するためにはDf×(√Dk)を低く抑える必要がある。本発明においては、5GHz以上の周波数帯において、スプリットポスト誘電体共振器法によって測定されるDk、Dfについて、Df×(√Dk)が<0.02、好ましくは<0.015、より好ましくは<0.012である。このDf×(√Dk)の範囲であれば、筐体用積層体として高周波帯の通信でも問題なく利用することができる。
ジペンタエリスリトールヘキサアクリレート:Mw=578.57、アクリル基数=6、水酸基数=0(内ジペンタエリスリトールペンタアクリレート:Mw=524.52、アクリル基数=5、水酸基数=1を35%含む)(共栄社化学社製 製品名DPHA)60重量部、ペンタエリスリトールトリアクリレート:Mw=298.29、アクリル基数=3、水酸基数=1(内ペンタエリスリトールテトラアクリレート:Mw=352.34、アクリル基数=4、水酸基数=0を40%含む)(共栄社化学社製 ライトアクリレートPE-3A)20重量部、トリメチロールプロパントリアクリレート:Mw=296.32、アクリル基数=3、水酸基数=0(共栄社化学社製 ライトアクリレートTMP-A)20重量部を混合し、さらに光重合開始剤として2-メチル-1-[4-(メチルチオ)フェニル]-2-モルフォリノプロパン-1-オン(IGM Resins B.V.社製 Omnirad 907)8重量部、有機溶剤としてプロピレングリコールモノメチルエーテルを固形分40%となるように調整して、コーティング膜用の光硬化性樹脂組成物A1を得た。この組成物A1において、光硬化性化合物100gあたりのアクリルモル数は{[(6/578.57×0.65)+(5/524.52×0.35)]×0.6+[(4/352.34×0.4)+(3/298.29×0.6)]×0.2+(3/296.32)×0.2}×100=1.02であり、同じく光硬化性化合物100gあたりの水酸基のモル数は[(1/524.52×0.35)×0.6+(1/298.29×0.6)×0.2]×100=0.08であった。なお、光硬化性化合物の構成成分のうち、(メタ)アクリル基が3官能以上のものの比率は100%であった。
表1に記載の原料および組成比率を用いた以外は、参考例1と同様の手順でコーティング膜用の光硬化性樹脂組成物A2~A4およびB1~B4を得た。
なお、表中の他の略称は以下を示す。
PE-4A:ペンタエリスリトールテトラアクリレート Mw=352.34、アクリル基数=4(共栄社化学社製)
DCPA:ジメチロール-トリシクロデカンジアクリレート Mw=304.39、アクリル基数=2(共栄社化学社製)
G201P:2-ヒドロキシ-3-アクリロイロキシプロピルメタクリレート Mw=214.22、(メタ)アクリル基数=2、水酸基数=1(共栄社化学社製)
TMP-6EO-3A:6EO変性トリメチロールプロパントリアクリレート Mw=560.64、アクリル基数=3(共栄社化学社製)
EBECRYL210:芳香族ウレタンアクリレート Mw=1,500、アクリル基数=2(ダイセル・オルネクス社製)
光硬化性化合物100g当たりのアクリルモル数=光硬化性化合物100g当たりの各成分のアクリルモル数(アクリル官能基数/分子量g・mol-1)の総和
光硬化性化合物100g当たりの水酸基モル数=光硬化性化合物100g当たりの各成分の水酸基数(水酸基数/分子量g・mol-1)の総和
上記の光硬化性樹脂組成物A1をポリカーボネート基材(厚み0.54mm、長さ10cm、幅10cm エスカーボシート社製)上にスピンコート法により乾燥後の膜厚が10μm(S1)及び20μm(S2)になるように塗布し、80℃で5分乾燥した後、室温下5分冷却した。その後、酸素雰囲気下、2kW/cm2の高圧水銀ランプを用い、2,800mJ/cm2積算露光量(365nm換算)で製膜し、それぞれ筐体用積層体S1及びS2を得た。
上記の光硬化性樹脂組成物A1をポリメチルメタクリレート/ポリカーボネートからなる複合板(厚み650μm、長さ10cm、幅10cm エスカーボシート社製)のポリメチルメタクリレート側にスピンコート法により乾燥後の膜厚が10μm(T1)及び20μm(T2)になるように塗布し、80℃で5分乾燥した後、室温下5分冷却した。その後、酸素雰囲気下、2kW/cm2の高圧水銀ランプを用い、2,800mJ/cm2積算露光量(365nm換算)で製膜し、それぞれ筐体用積層体T1及びT2を得た。
<積層体S3~S8の作製>
表1の組成比率で配合された光硬化性樹脂組成物A2~A4を用いたこと以外は、実施例1、2と同じ手順で筐体用積層体S3~S8を作製した。
<積層体T3~T4の作製>
表1の組成比率で配合された光硬化性樹脂組成物A2を用いたこと以外は、実施例9、10と同じ手順で筐体用積層体T3~T4を作製した。
コーティング層を有さないゴリラガラス(強化品、コーニング社製)、コーティング層を有さないポリカーボネート及びコーティング層を有さないポリメチルメタクリレート/ポリカーボネート複合板を、それぞれ比較例1、2、3とした。
表1の組成比率で配合された光硬化性樹脂組成物B1~B4を用いたこと以外は、実施例9、10と同じ手順で筐体用積層体U1~U8を作製した。
上記にて得られた筐体用積層体S1~S8(実施例)、T1~T4(実施例)、コーティング層を有さないゴリラガラス、コーティング層を有さないポリカーボネート及びコーティング層を有さないポリメチルメタクリレート/ポリカーボネート複合板(比較例)、並びに筐体用積層体U1~U8、(比較例)を用いて、以下の評価を行った。なお評価結果を表2および表3に示した。
<耐スチールウール性>
♯0000のスチールウールを用い、往復摩耗試験機(Type:30S HEIDON社製)を用いて、荷重1.5kg/cm2にてコーティング層の表面を300往復摩耗した。傷の長さ1mm以上を傷と判断し、傷の発生の有無を蛍光灯下で目視により観察し、以下の基準にのっとり傷の本数を評価した。
〇:傷なし
△:10本未満の傷あり
×:10本以上の傷あり
23℃、50%RHの雰囲気下に24hr以上静置したサンプルを、23℃の雰囲気下Agilent Technologies社製 商品名:Network Analyzer E8363Cを用いて、スプリットポスト誘電体共振器法により周波数5GHz、10GHzでの誘電率Dfおよび誘電正接Dkを測定した。また、得られた数値からDf×(√Dk)を算出した。
Claims (7)
- ポリカーボネート基材またはポリメチルメタクリレートとポリカーボネートとからなる複合板である基材に、コーティング層を有して、筐体に用いられる積層体であって、以下の条件1及び条件2を満たすことを特徴とする筐体用積層体。
条件1:5GHz以上の周波数帯においてスプリットポスト誘電体共振器法により測定された比誘電率Dk及び誘電正接Dfの関係が以下の式を満たすこと。
Df×(√Dk)<0.02
条件2:コーティング層に対して#0000のスチールウールを1.5kg/cm2荷重で300往復させた後に目視で傷が確認されないこと。 - ポリカーボネート基材またはポリメチルメタクリレートとポリカーボネートとからなる複合板である基材の厚みが0.4~2.0mmである請求項1記載の筐体用積層体
- コーティング層が光硬化性樹脂組成物の硬化物であって、該組成物が(a)光硬化性化合物、(b)光重合開始剤および(c)溶剤を含むことを特徴とする請求項1または2に記載の筐体用積層体。
- 光硬化性化合物の75質量%以上が分子中に3個以上の(メタ)アクリル基を有する請求項3または4に記載の筐体用積層体。
- 光硬化性化合物の100g当たりの水酸基のモル数が0.06以上、0.2以下である請求項3~5のいずれかに記載の筐体用積層体。
- コーティング層の厚みが1~30μmである請求項1~6のいずれかに記載の筐体用積層体
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| JP2019197048A (ja) * | 2018-05-02 | 2019-11-14 | 三菱エンジニアリングプラスチックス株式会社 | ミリ波レーダー用カバー及びそれを備えるミリ波レーダーモジュール |
| JP2019215452A (ja) * | 2018-06-13 | 2019-12-19 | 日立化成株式会社 | 感光性樹脂組成物、配線層及び半導体装置 |
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| JP2018150522A (ja) * | 2017-03-13 | 2018-09-27 | 三洋化成工業株式会社 | 光硬化性樹脂組成物 |
| JP2019197048A (ja) * | 2018-05-02 | 2019-11-14 | 三菱エンジニアリングプラスチックス株式会社 | ミリ波レーダー用カバー及びそれを備えるミリ波レーダーモジュール |
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