Two-component composition, cured product, and article
A two-component composition using glycidyl (meth) acrylate and maleimide acid copolymers addresses adhesion and water resistance issues on PC and ABS substrates, forming durable and resistant coating films via a Diels-Alder reaction.
Patent Information
- Application Number
- PCT/CN2024/086971
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-10-16
AI Technical Summary
Existing compositions utilizing the Diels-Alder reaction often fail to provide sufficient adhesion and water resistance on polycarbonate (PC) substrates, leading to coating films that do not adhere properly or peel off when exposed to water.
A two-component composition is formulated using a polymer with a diene structure derived from glycidyl (meth) acrylate and sorbic acid, and a polymer with a dienophile structure derived from maleimide acid, which are copolymers with specific glass transition temperatures and molecular weights, enabling a Diels-Alder reaction to form a coating film with enhanced adhesion and water resistance on PC and acrylonitrile-butadiene-styrene (ABS) substrates.
The composition achieves coating films with excellent adhesion, water resistance, rubbing resistance, and sunscreen resistance on PC and ABS substrates, even under exposure to chemicals like alcohol, through a low-temperature curing process.
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Figure PCTCN2024086971-FTAPPB-I100001 
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Figure PCTCN2024086971-FTAPPB-I100003
Abstract
Description
TWO-COMPONENT COMPOSITION, CURED PRODUCT, AND ARTICLETechnical Field
[0001] The present disclosure relates to a two-component composition, a cured product, and an article.Background Art
[0002] Paints used in automobiles, household electrical appliances, building materials, and the like are required to have various performances such as chemical resistance, scratch resistance, and adhesion to substrates. Conventionally, compositions which are cured by reacting a compound having an isocyanate group with a compound having a hydroxy group have been generally used as such paints. In recent years, compositions that do not use the compound having an isocyanate group have been considered due to the problems such as the toxicity to the body of the compound.
[0003] For example, as a curable composition utilizing the Diels-Alder reaction, PLT 1 discloses a thermosetting composition including a compound (A) carrying a plurality of conjugated carbon-carbon double bonds in a molecule as a sorbic acid ester and a compound (B) having two or more carbon-carbon double bonds in a molecule.Citation ListPatent Literature
[0004] PLT 1: Japanese Unexamined Patent Application Publication No. 2009-079189Summary of InventionTechnical Problem
[0005] According to the study by the present inventors, when a composition utilizing the Diels-Alder reaction is used as a paint, adhesion and water resistance are sometimes insufficient depending on the material of a target substrate to which the composition is applied. More specifically, when the composition is applied on a substrate made of polycarbonate (PC) (hereinafter, also referred to as "PC substrate" ) , problems that a coating film does not adhere sufficiently to the PC substrate or problems that even if the coating film adheres thereto, it peels off when exposed to water (poor water resistance) , may arise.
[0006] One aspect of the present invention is to provide a composition capable of forming a coating film having excellent adhesion and water resistance on a PC substrate.Solution to Problem
[0007] The present inventors have found that, in a composition capable of forming a coating film utilizing the Diels-Alder reaction between a polymer having a diene structure and a polymer having a dienophile structure, a coating film having excellent adhesion and water resistance could be formed on a PC substrate by using a copolymer containing glycidyl (meth) acrylate as a monomer unit as a base polymer, and adding sorbic acid to the base polymer to give a diene structure and also adding maleimide acid to the base polymer to give a dienophile structure.
[0008] The present invention includes the following aspects.
[0009] [1] A two-component composition including a first composition containing a polymer A having a diene structure and a second composition containing a polymer B having a dienophile structure, in which the polymer A is a polymer in which sorbic acid is added to a glycidyl group in a copolymer C containing glycidyl (meth) acrylate as a monomer unit, and the polymer B is a polymer in which maleimide acid is added to a glycidyl group in a copolymer C.
[0010] [2] The two-component composition according to [1] , in which the polymer C has a glass transition temperature of 40℃ or higher.
[0011] [3] The two-component composition according to [1] or [2] , in which the polymer C has a weight average molecular weight of 50,000 or less.
[0012] [4] The two-component composition according to any one of [1] to [3] , in which the two-component composition is used as a coating material.
[0013] [5] A cured product of the two-component composition according to any one of [1] to [4] .
[0014] [6] An article including a substrate and the cured product according to [5] disposed on the substrate.Advantageous Effects of Invention
[0015] According to one aspect of the present invention, a composition capable of forming a coating film having excellent adhesion and water resistance on a PC substrate can be provided. According to the composition, in another aspect, a coating film having excellent adhesion and water resistance can also be formed on a substrate made of acrylonitrile-butadiene-styrene (ABS) resin (hereinafter, also referred to as "ABS substrate" ) . In addition, according to the composition, in another aspect, a coating film having excellent rubbing resistance (in particular, rubbing resistance in presence of chemicals such as alcohol, and the same applies hereinafter) and sunscreen resistance can be formed on the ABS substrate.Description of Embodiments
[0016] One embodiment of the present invention is a two-component composition including a first composition containing a polymer A having a diene structure and a second composition containing a polymer B having a dienophile structure.
[0017] The polymer A is a polymer in which sorbic acid is added to a glycidyl group in a copolymer C containing glycidyl (meth) acrylate as a monomer unit.
[0018] The copolymer C contains one or more types of other monomers copolymerizable with glycidyl (meth) acrylate in addition to glycidyl (meth) acrylate as a monomer unit. Other monomers may be monomers having an ethylenically unsaturated group.
[0019] Other monomers are preferably monomers in which a homopolymer has a glass transition temperature (Tg) of 60℃ or higher. Specific examples of such other monomers include styrene, isobornyl (meth) acrylate, methyl methacrylate, ethyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, isopropyl methacrylate, and 3,3, 5-trimethylcyclohexyl methacrylate.
[0020] The content of glycidyl (meth) acrylate may be 5 mass%or more, 8 mass%or more, 10 mass%or more, 12 mass%or more, or 14 mass%or more and may be 70 mass%or less, 60 mass%or less, 55 mass%or less, 50 mass%or less, or 45 mass%or less based on a total mass of a monomer unit in the copolymer C, and may preferably be 40 mass%or less, 35 mass%or less, or 30 mass%or less from the viewpoint of being capable of forming the coating film having more excellent water resistance on the PC substrate.
[0021] The content of other monomers may be 30 mass%or more, 40 mass%or more, 45 mass%or more, 50 mass%or more, 55 mass%or more, 60 mass%or more, 65 mass%or more, or 70 mass%or more and may be 95 mass%or less, 92 mass%or less, 90 mass%or less, 88 mass%or less, or 86 mass%or less based on a total mass of a monomer unit in the copolymer C.
[0022] The weight average molecular weight (Mw) of the copolymer C may be 3,000 or more, 5,000 or more, 7,000 or more, or 9,000 or more, and may preferably be 12,000 or more or 15,000 or more from the viewpoint of being capable of forming the coating film having excellent sunscreen resistance on the ABS substrate, and may preferably be 50,000 or less, 40,000 or less, 30,000 or less, or 25,000 or less from the viewpoint of being capable of forming the coating film having more excellent adhesion and water resistance on the PC substrate.
[0023] A weight average molecular weight (Mw) herein means a value measured under the following GPC measurement conditions.
[0024] [GPC Measurement Conditions]
[0025] Measuring device: High performance GPC system ( "HLC-8220GPC" , manufactured by Tosoh Corporation)
[0026] Column: The following columns manufactured by Tosoh Corporation were used, connected in series.
[0027] "TSKgel G5000" (7.8 mm I.D. × 30 cm) x 1
[0028] "TSKgel G4000" (7.8 mm I.D. × 30 cm) x 1
[0029] "TSKgel G3000" (7.8 mm I.D. × 30 cm) x 1
[0030] "TSKgel G2000" (7.8 mm I.D. × 30 cm) x 1
[0031] Detector: Refractive index detector (RI)
[0032] Column temperature: 40℃
[0033] Eluent: Tetrahydrofuran (THF)
[0034] Flow rate: 1.0 mL / min
[0035] Injection volume: 100 μL (tetrahydrofuran solution with 4 mg / mL sample concentration)
[0036] Standard sample: The following monodisperse polystyrene was used to prepare a calibration curve.
[0037] [Monodisperse Polystyrene]
[0038] "TSKgel Standard Polystyrene A-500" , manufactured by Tosoh Corporation
[0039] "TSKgel Standard Polystyrene A-1000" , manufactured by Tosoh Corporation
[0040] "TSKgel Standard Polystyrene A-2500" , manufactured by Tosoh Corporation
[0041] "TSKgel Standard Polystyrene A-5000" , manufactured by Tosoh Corporation
[0042] "TSKgel Standard Polystyrene F-1" , manufactured by Tosoh Corporation
[0043] "TSKgel Standard Polystyrene F-2" , manufactured by Tosoh Corporation
[0044] "TSKgel Standard Polystyrene F-4" , manufactured by Tosoh Corporation
[0045] "TSKgel Standard Polystyrene F-10" , manufactured by Tosoh Corporation
[0046] "TSKgel Standard Polystyrene F-20" , manufactured by Tosoh Corporation
[0047] "TSKgel Standard Polystyrene F-40" , manufactured by Tosoh Corporation
[0048] "TSKgel Standard Polystyrene F-80" , manufactured by Tosoh Corporation
[0049] "TSKgel Standard Polystyrene F-128" , manufactured by Tosoh Corporation
[0050] "TSKgel Standard Polystyrene F-288" , manufactured by Tosoh Corporation
[0051] "TSKgel Standard Polystyrene F-550" , manufactured by Tosoh Corporation
[0052] The glass transition temperature (Tg) of the copolymer C may preferably be 40℃ or higher, 50℃ or higher, 60℃ or higher, or 70℃ or higher and 105℃ or lower, 100℃ or lower, or 95℃ or lower from the viewpoint of being capable of forming the coating film having more excellent water resistance on the PC substrate and also being capable of forming the coating film having excellent water resistance, rubbing resistance, and sunscreen resistance on the ABS substrate.
[0053] The glass transition temperature (Tg) herein means a value which is determined by calculating according to the FOX equation:
[0054] 1 / Tg = W1 / Tg1 + W2 / Tg2 + ...
[0055] (Tg: glass transition temperature to be determined, W1: weight fraction of a first monomer constituting the copolymer C, Tg1: glass transition temperature of a homopolymer of a first monomer constituting the copolymer C, W2: weight fraction of a second monomer constituting the copolymer C, Tg2: glass transition temperature of a homopolymer of a second monomer constituting the copolymer C, ... ) .
[0056] For values of the glass transition temperature of the homopolymer of each monomer constituting the copolymer C, values described in Polymer Handbook (4th Edition) , written by J. Brandrup, E. H. Immergut, and E. A. Grulke (Wiley Interscience) and actual values measured by differential scanning calorimetry (DSC) after synthesis of the homopolymer are used.
[0057] The copolymer C may be any copolymer such as a random copolymer, a block copolymer, or a graft copolymer.
[0058] (Polymerization Method)
[0059] Any appropriate method may be employed for a polymerization method of the copolymer C, and examples thereof include solution polymerization, bulk polymerization, emulsion polymerization, and various types of radical polymerization, and in particular, solution polymerization is preferable from the viewpoint of handleability.
[0060] (Radical Polymerization Initiator)
[0061] The polymer C may contain a radical polymerization initiator, for example, when radical polymerization is performed. The radical polymerization initiator may be, for example, a thermal polymerization initiator that makes free radicals to be generated upon heating. They may be used alone or in combination of two or more.
[0062] Examples of the radical polymerization initiator include a peroxide-based radical polymerization initiator and an azo-based radical polymerization initiator. In particular, a peroxide-based radical polymerization initiator is preferable.
[0063] Examples of the peroxide-based radical polymerization initiator include a hydroperoxide compound such as 1, 1, 3, 3-tetramethylbutylhydroperoxide; a dialkyl peroxide compound such as tert-butylcumyl peroxide, di-tert-butyl peroxide, di-tert-hexyl peroxide, dicumyl peroxide, 1, 4-bis (1-tert-butylperoxy-1-methylethyl) benzene, and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane; a diacyl peroxide compound such as dilauroyl peroxide, didecanoyl peroxide, dicyclohexyl peroxydicarbonate, and bis (4-tert-butylcyclohexyl) peroxydicarbonate; and a peroxyester compound such as tert-butyl peroxyacetate, tert-butyl peroxybenzoate, tert-butylperoxyisopropyl monocarbonate, tert-butylperoxy-2-ethylhexanoate, tert-hexylperoxy-2-ethylhexanoate, tert-butylperoxyneodecanoate, tert-hexylperoxyisopropyl monocarbonate, tert-butylperoxylaurate, (1, 1-dimethylpropyl) 2-ethylperhexanoate, tert-butyl 2-ethylperhexanoate, tert-butyl 3, 5, 5-trimethylperhexanoate, tert-butylperoxy-2-ethylhexyl monocarbonate, and tert-butylperoxymaleic acid.
[0064] Examples of the azo-based radical polymerization initiator include an azonitrile compound such as 2, 2'-azobis (4-methoxy-2, 4-dimethylvaleronitrile) , 2, 2'-azobis (2, 4-dimethylvaleronitrile) , 2, 2'-azobisisobutyronitrile, 2, 2'-azobis (2-methylbutyronitrile) , 1, 1'-azobis (cyclohexane-1-carbonitrile) , 1- [ (1-cyano-1-methylethyl) azo] formamide, and 2-phenylazo-4-methoxy-2, 4-dimethyl-valeronitrile; an azoamide compound such as 2, 2'-azobis [2-methyl-N- [1, 1-bis (hydroxymethyl) -2-hydroxyethyl] propionamide] , 2, 2'-azobis [2-methyl-N- [1, 1-bis (hydroxymethyl) ethyl] propionamide] , 2, 2'-azobis [2-methyl-N-[2-(1-hydroxybutyl) ] -propionamide] , 2, 2'-azobis [2-methyl-N- (2-hydroxyethyl) -propionamide] , 2, 2'-azobis (2-methylpropionamide) dihydrate, 2, 2'-azobis [N- (2-propenyl) -2-methylpropionamide] , 2, 2'-azobis (N-butyl-2-methylpropionamide) , and 2, 2'-azobis (N-cyclohexyl-2-methylpropionamide) ; and an alkyl azo compound such as 2, 2'-azobis (2, 4, 4-trimethylpentane) and 2, 2'-azobis (2-methylpropane) .
[0065] Examples of the commercial product of the radical polymerization initiator include "PERBUTYL C" , "PERBUTYL A" , "PERBUTYL P" , "PERBUTYL L" , "PERBUTYL O" , "PERBUTYL ND" , "PERBUTYL Z" , "PERBUTYL I" , "PERCUMYL P" , "PERCUMYL D" , "PERHEXYL D" , "PERHEXYL A" , "PERHEXYL I" , "PERHEXYL Z" , "PERHEXYL ND" , "PERHEXYL O" , and "PERHEXYL PV" , all manufactured by NOF CORPORATION.
[0066] The amount of the radical polymerization initiator used may be a usual used amount, and for example, may be selected from a range of about 0.3 to 15 mass parts and is preferably 0.5 to 10 mass parts based on 100 mass parts of a total amount of the monomer components constituting the polymer C.
[0067] The polymerization temperature and polymerization time may be selected as appropriate according to the type of monomer used, the type of polymerization initiator used, and the like, and for example, the polymerization temperature may be about 80 to 130℃, and the polymerization time may be about 5 hours to 20 hours.
[0068] (Chain Transfer Agent)
[0069] Various conventionally known chain transfer agents (molecular weight modifier or degree of polymerization modifier) may be used in polymerization, if necessary. The chain transfer agent is selected from, for example, mercaptans such as n-lauryl mercaptan, t-lauryl mercaptan, glycidyl mercaptan, and 2-mercaptoethanol, and in particular, t-lauryl mercaptan is preferably used. They may be used alone or in combination of two or more.
[0070] The amount of the chain transfer agent used may be a usual used amount, and may be selected from a range of about 0.1 to 10 mass parts based on 100 mass parts of a total amount of monomer components constituting the polymer C.
[0071] The polymer A is obtained by reacting a glycidyl group in the copolymer C with a carboxyl group of sorbic acid. That is, the polymer A is a polymer having a structural unit represented by the following formula (1) :
[0072] [Chemical formula 1]
[0073] where R1 represents a hydrogen atom or a methyl group.
[0074] The amount of sorbic acid added may be 3 mass parts or more, 5 mass parts or more, or 10 mass parts or more, and 50 mass parts or less, 45 mass parts or less, 40 mass parts or less, or 35 mass parts or less based on 100 mass parts of a total mass of a monomer unit in the copolymer C.
[0075] The concentration of the diene structure in the polymer A may be 0.3 mmol / g or more or 0.5 mmol / g or more, and may be 4 mmol / g or less, 3 mmol / g or less, 2.5 mmol / g or less, 2.1 mmol / g or less, or 2 mmol / g or less.
[0076] The first composition may further contain an organic solvent capable of dissolving the polymer A. As the organic solvent, n-butyl acetate, acetone, diethyl ketone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, tetrahydrofuran, dioxane, ethyl acetate, butyl acetate, isobutyl acetate, propyl acetate, n-pentane, n-hexane, cyclohexane, n-heptane, benzene, toluene, xylene, carbon tetrachloride, dichloromethane, chloroform, trichloroethane, dimethylformamide, N-methyl pyrrolidone, acetonitrile, diacetone alcohol, normal butanol, propylene glycol monomethyl ether acetate, and the like may be used. The amount of these solvents blended is not particularly limited, and may be selected as appropriate.
[0077] The first composition may further contain an additive. As an additive, a silane coupling agent, a lubricant, a filler, a thixotropic agent, a tackifier, wax, a heat stabilizer, a light stabilizer, a fluorescent brightening agent, a foaming agent, a pH adjuster, a leveling agent, an anti-gelling agent, a dispersion stabilizer, an antioxidant, a radical scavenger, a heat resistant imparting agent, an inorganic filler, an organic filler, a plasticizer, a reinforcing agent, an anti-bacterial agent, an anti-fungal agent, an anti-rust agent, a thermoplastic resin, a thermosetting resin, a pigment, a dye, a conductivity imparting agent, an anti-static agent, a moisture permeability improver, a water repellent, an oil repellent, a hollow foamed body, a crystal water-containing compound, a flame retardant, a water absorbing agent, a moisture absorbing agent, a deodorizing agent, a foam stabilizer, an anti-foaming agent, a mildew-proofing agent, a preservative, an algaecide, a pigment dispersant, an anti-blocking agent, an anti-hydrolysis agent, and the like may be used. The amount of these additives blended is not particularly limited, and may be selected as appropriate.
[0078] The polymer B is a polymer in which maleimide acid is added to a glycidyl group in the copolymer C. The details of the copolymer C are the same as those of the polymer C described for the polymer A.
[0079] Maleimide acid is a compound having a maleimide group and a carboxyl group. Maleimide acid may be represented, for example, by the following formula (2) :
[0080] [Chemical formula 2]
[0081] where R2 represents an alkylene group.
[0082] An alkylene group represented by R2 may be linear or branched. The number of carbon atoms in the alkylene group may be 1 or more, 2 or more, 3 or more, or 4 or more, and may be 11 or less, 10 or less, 9 or less, 8 or less, 7 or less, or 6 or less.
[0083] The polymer B is obtained by reacting a glycidyl group in the copolymer C with a carboxyl group in maleimide acid. For example, when maleimide acid is a compound represented by the above formula (2) , the polymer B is a polymer having a structural unit represented by the following formula (3) :
[0084] [Chemical formula 3]
[0085] where R2 is synonymous with R2 in the above formula (2) and R3 represents a hydrogen atom or a methyl group.
[0086] The amount of maleimide acid added may be 5 mass parts or more, 8 mass parts or more, 10 mass parts or more, 15 mass parts or more, or 20 mass parts or more, and may be 110 mass parts or less, 90 mass parts or less, 80 mass parts or less, 70 mass parts or less, or 60 mass parts or less based on 100 mass parts of a total mass of a monomer unit in the copolymer C.
[0087] The concentration of the dienophile structure in the polymer B may be 0.6 mmol / g or more, 1.0 mmol / g or more, or 1.5 mmol or more, and may be 4.6 mmol or less, 4.0 mmol or less, or 3.6 mmol or less.
[0088] The second composition may further contain an organic solvent capable of dissolving the polymer B. The organic solvents described in the first composition may be used as the organic solvent.
[0089] The second composition may further contain an additive. The additives described in the first composition may be used as an additive.
[0090] The two-component composition described above is suitable for use as a coating material (paint) , and may be used, for example, as a coating material (paint) to be applied on a substrate described below, and is particularly suitable for use as a coating material (paint) to be applied on the PC substrate. That is, one embodiment of the present invention is a use (application) of the two-component composition described above as a coating material (paint) , and may be a use (application) , for example, as a coating material (paint) to be applied on a substrate as described below, and is preferably a use (application) as a coating material (paint) to be applied on the PC substrate.
[0091] In order to adjust a viscosity in which the two-component composition (coating material) is easily applied, the two-component composition may be diluted with a solvent when mixing the first composition and the second composition, if necessary. As the solvent, for example, acetone, diethyl ketone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, tetrahydrofuran, dioxane, ethyl acetate, butyl acetate, isobutyl acetate, propyl acetate, n-pentane, n-hexane, cyclohexane, n-heptane, benzene, toluene, xylene, carbon tetrachloride, dichloromethane, chloroform, trichloroethane, dimethylformamide, N-methyl pyrrolidone, acetonitrile, diacetone alcohol, normal butanol, propylene glycol monomethyl ether acetate, and the like may be used. The amount of these solvents blended is not particularly limited, and may be selected as appropriate.
[0092] The two-component composition (coating material) may further contain other curing agents (cross-linking agents) , if necessary. The cross-linking agent is not particularly limited, but examples thereof include an epoxy-based cross-linking agent, an oxazoline-based cross-linking agent, an aziridine-based cross-linking agent, a metal chelate-based cross-linking agent, and a carbodiimide-based cross-linking agent. The cross-linking agent may be used as appropriate according to the type of a functional group contained in the coating composition used and the like. They may be used alone or in combination of two or more.
[0093] By mixing and heating the first composition and the second composition constituting the two-component composition, the Diels-Alder reaction proceeds between the polymer A having a diene structure and the polymer B having a dienophile structure, resulting in the cured product of the two-component composition (mixture of the first composition and the second composition) . That is, one embodiment of the present invention is a cured product of a two-component composition (mixture of a first composition and a second composition) . Since this Diels-Alder reaction proceeds at a relatively low temperature (for example, 80℃ or lower) , the two-component composition according to one embodiment is advantageous in that the two-component composition is cured by heating at relatively low temperature (for example, 80℃ or lower) .
[0094] The two-component composition (mixture of the first composition and the second composition) is, for example, applied on a substrate and then heated to be cured. That is, one embodiment of the present invention is an article including a substrate and a cured product of a two-component composition (mixture of a first composition and a second composition) disposed on the substrate.
[0095] The two-component composition is capable of forming the coating film having excellent adhesion and water resistance on the PC substrate, and the material of the substrate is not limited to polycarbonate. The material of the substrate includes various plastics such as polycarbonate, an acrylonitrile-butadiene-styrene copolymer, a PC-ABS polymer alloy, polymethyl methacrylate, polyethylene terephthalate, polyamide, and polypropylene, a fiber reinforced plastic made by adding a filler such as glass fiber to these plastics; various metals such as iron, copper, zinc, aluminum, and magnesium and an alloy thereof; and wood.
[0096] Examples of the article include interior and exterior materials of various vehicles such as automobiles and railroad vehicles; interior and exterior materials of buildings such as industrial machineries, exterior walls, roofs, glasses, decorative boards, and wooden floors; civil engineering components such as soundproof walls and drain gutters; housings of home appliances such as televisions, refrigerators, washing machines, and air conditioners; housings of electronic equipment such as computers, smartphones, cell phones, digital cameras, and games; and housings of OA equipment such as printers and facsimile machines.
[0097] [Example]
[0098] The present invention will be described more specifically below based on Examples, but the present invention is not limited to Examples.
[0099] [Production of Polymer A]
[0100] (Production Example 1)
[0101] To a flask equipped with a cooling tube, a thermometer, a dropping funnel, and a stirrer, 262.5 mass parts of n-butyl acetate was added, and the temperature in the flask was raised to 90℃. Next, a mixture of 430 mass parts of methyl methacrylate (MMA) , 70.0 mass parts of glycidyl methacrylate (GMA) , 183.7 mass parts of n-butyl acetate, and 35.0 mass parts of t-butyl peroxy-2-ethyl hexanoate (PERBUTYL O) was added dropwise over 2 hours. Two hours after the end of dropping, the temperature in the flask was raised to 120℃ and the polymerization reaction was allowed to proceed for 2 hours. Additional n-butyl acetate was then added to obtain a solution of the copolymer C (weight average molecular weight (Mw) : 9,000, glass transition temperature (Tg) : 95℃) having a non-volatile content of 50 mass%.
[0102] To 492.0 mass parts of a solution obtained, 25.8 mass parts of sorbic acid (SBA) , 0.5 mass parts of dibutylhydroxytoluene (BHT) , 0.1 mass parts of hydroquinone monomethyl ether (MEHQ) , 1.4 mass parts of tetrabutylphosphonium bromide, and 24.2 mass parts of n-butyl acetate were added. The temperature in the flask was raised to 110℃, and the reaction was allowed to proceed for 10 hours to obtain a solution of a polymer A-1 having a diene structure having a non-volatile content of 55 mass%.
[0103] (Production Examples 2 to 9)
[0104] Solutions of polymers A-2 to A-9 were obtained in the same manner as in Production Example 1, except that the monomer composition of the copolymer C, the amount of the initiator added when synthesizing the copolymer C, and the amount of sorbic acid (SBA) added were changed as shown in Table 1. In Table 1, St, BA, and BMA stand for styrene, n-butyl acrylate, and n-butyl methacrylate, respectively.
[0105] [Production of Polymer B]
[0106] (Production Example 10)
[0107] To 500.0 mass parts of a solution of the copolymer C (weight average molecular weight (Mw) : 9,000, glass transition temperature (Tg) : 95℃) having a non-volatile content of 50 mass%obtained in the same manner as in Production Example 1, 52.0 mass parts of maleimidocaproic acid (MCA) , 0.5 mass parts of dibutyl hydroxytoluene (BHT) , 0.1 mass parts of MEHQ, 1.4 mass parts of tetrabutylphosphonium bromide, and 197.2 mass parts of n-butyl acetate were added. The temperature in the flask was raised to 110℃, and the reaction was allowed to proceed for 10 hours to obtain a solution of polymer B-1 having a dienophile structure and having a non-volatile content of 40 mass%.
[0108] (Production Examples 11 to 17)
[0109] Solutions of polymers B-2 to B-8 were obtained in the same manner as in Production Example 10, except that the monomer composition of copolymer C and the amount of maleimidocaproic acid (MCA) added were changed as shown in Table 2.
[0110] [Production of Polymer b for Comparison]
[0111] A solution of the polymer b for comparison was obtained in the same manner as in Production Example 12, except that acrylic acid (AA) was used instead of maleimidocaproic acid (MCA) .
[0112] (Example 1)
[0113] [Evaluation of Characteristics of PC Substrate]
[0114] A solution containing a polymer A-1 having a diene structure (first composition) was mixed with a solution containing a polymer B-1 having a dienophile structure (second composition) and the mixture was adjusted with butyl acetate and isooctanol so that the non-volatile content was from 30 to 40 mass%to obtain a coating solution. The solution containing the polymer A-1 and the solution containing the polymer B-1 were mixed so that the ratio of the amount of a diene structure (mol) of the polymer A-1 to the amount of a dienophile structure (mol) of the polymer B-1 was 1: 1 (molar ratio) . The coating solution was then applied on the PC substrate (polycarbonate (product name: PC1600) , manufactured by C. I TAKIRON Corporation) using a bar coater so that a film thickness thereof was from 15 to 20 μm. The film was allowed to stand for 10 minutes, and then was dried at 80℃ for 30 minutes, followed by being allowed to stand at room temperature (25℃) for about 7 days to obtain a coating film (cured product) .
[0115] (Adhesion)
[0116] The obtained coating film (cured product) was subjected to a cross-cut test (1 mm, 100 squares, 4 directions) in accordance with ASTM D3359, and adhesion to the PC substrate was evaluated according to the criteria 5B, 4B, 3B, 2B, 1B, and 0B.
[0117] (Water resistant)
[0118] The obtained coating film (cured product) was immersed in water (40℃) for 240 hours and then subjected to the cross-cut test (1 mm, 100 squares, 4 directions) in accordance with ASTM D3359 to evaluate adhesion (water resistance) to the PC substrate after immersion according to the criteria 5B, 4B, 3B, 2B, 1B, and 0B.
[0119] [Evaluation of Characteristics for ABS Substrate]
[0120] A coating film (cured product) was obtained on the ABS substrate in the same manner as the evaluation of characteristics for the PC substrate, except that the ABS substrate (manufactured by Showa Denko Materials Co., Ltd, acrylonitrile-butadiene-styrene copolymer (trade name: KOBE POLYSHHET ABS-BKWB) ) was used instead of the polycarbonate (PC) substrate.
[0121] (Adhesion and Water Resistance)
[0122] The obtained coating film (cured product) was evaluated for adhesion to and water resistance of the ABS substrate in the same manner as the evaluation of characteristics for the PC substrate.
[0123] (Rubbing resistance)
[0124] The obtained coating film (cured product) was subjected to the rubbing test in which a felt containing ethanol (reagent grade 1, 95%or higher) was pressed against the obtained coating film to reciprocate a maximum of 500 times while a load of 1 kg is being applied. The condition of the coating film after the rubbing test was visually observed and the rubbing resistance was evaluated according to the following criteria.
[0125] A: The surface of the ABS substrate was not visible even after 500 times of reciprocation.
[0126] B: The surface of the ABS substrate was visible after 350 times or more and 500 times or less of reciprocation.
[0127] C: The surface of the ABS substrate was visible after less than 350 times of reciprocation.
[0128] (Sunscreen Resistance)
[0129] A sunscreen cream ( "Coppertone·Sport Ultra Sweat Proof SPF30" , manufactured by SSL Healthcare Japan Ltd. ) was evenly applied (0.5 g / 100 cm2) to the obtained coating (cured product) , dried at 55℃ for 4 hours, and then washed the sunscreen cream with a neutral detergent (manufactured by Kao Corporation, product name "Cucute" ) . The appearance of the coating film was observed after washing and sunscreen resistance was evaluated according to the following criteria.
[0130] A: The area of a trace of sunscreen cream is less than 5%of a total area of the coating film.
[0131] B: The area of a trace of sunscreen cream is 5%or more and less than 20%of a total area of the coating film.
[0132] C: The area of a trace of sunscreen cream is 20%or more of a total area of the coating film.
[0133] (Examples 2 to 13)
[0134] The coating films (cured products) were prepared and evaluated in the same manner as in Example 1, except that the types of the polymer A and the polymer B were changed as shown in Tables 3 to 5.
[0135] (Comparative Example 1)
[0136] The coating film (cured product) was prepared and evaluated in the same manner as in Example 4, except that a solution of a polymer b for comparison was used instead of the solution of the polymer B (second composition) .
[0137] (Comparison Example 2)
[0138] The coating film (cured product) was prepared and evaluated in the same manner as in Example 4, except that N, N'-hexamethylene bismaleimide was used as a curing agent instead of the solution of the polymer B.
[0139] The evaluation results in the above Examples and Comparative Examples are shown in Tables 3 to 5.
[0140] [Table 3]
[0141] [Table 4]
[0142] [Table 5]
Claims
1.A two-component composition comprising:a first composition containing a polymer A having a diene structure; anda second composition containing a polymer B having a dienophile structure, whereinthe polymer A is a polymer in which sorbic acid is added to a glycidyl group in a copolymer C containing glycidyl (meth) acrylate as a monomer unit, andthe polymer B is a polymer in which maleimide acid is added to a glycidyl group in the copolymer C.2.The two-component composition according to claim 1, wherein the polymer C has a glass transition temperature of 40℃ or higher.3.The two-component composition according to claim 1, wherein the polymer C has a weight average molecular weight of 50,000 or less.4.The two-component composition according to any one of claims 1 to 3, wherein the two-component composition is used as a coating material.5.A cured product of the two-component composition according to any one of claims 1 to 3.6.An article comprising:a substrate; andthe cured product according to claim 5 disposed on the substrate.
Citation Information
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