WO2022158030A1 - 樹脂ガラス用コーティング剤および樹脂ガラス - Google Patents
樹脂ガラス用コーティング剤および樹脂ガラス Download PDFInfo
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- WO2022158030A1 WO2022158030A1 PCT/JP2021/033105 JP2021033105W WO2022158030A1 WO 2022158030 A1 WO2022158030 A1 WO 2022158030A1 JP 2021033105 W JP2021033105 W JP 2021033105W WO 2022158030 A1 WO2022158030 A1 WO 2022158030A1
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/81—Unsaturated isocyanates or isothiocyanates
- C08G18/8141—Unsaturated isocyanates or isothiocyanates masked
- C08G18/815—Polyisocyanates or polyisothiocyanates masked with unsaturated compounds having active hydrogen
- C08G18/8158—Polyisocyanates or polyisothiocyanates masked with unsaturated compounds having active hydrogen with unsaturated compounds having only one group containing active hydrogen
- C08G18/8175—Polyisocyanates or polyisothiocyanates masked with unsaturated compounds having active hydrogen with unsaturated compounds having only one group containing active hydrogen with esters of acrylic or alkylacrylic acid having only one group containing active hydrogen
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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
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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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
- C08J7/06—Coating with compositions not containing macromolecular substances
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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
- C08J7/12—Chemical modification
- C08J7/16—Chemical modification with polymerisable compounds
- C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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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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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/47—Levelling agents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
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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
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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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
- C08J2433/00—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
- C08J2433/04—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
- C08J2433/06—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
- C08J2433/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
Definitions
- the present invention relates to a coating agent for resin glass and resin glass.
- Patent Document 1 discloses a coated polycarbonate plate-like molding having a polycarbonate plate-like molded body, a primer layer provided on at least one side of the molded body, and a hard coat layer formed on the primer layer. A method of body formation is described. The hard coat layer is formed by heating and curing a hard coat coating liquid containing colloidal silica and a hydrolyzed condensate of trialkoxysilane.
- the present invention has been made in view of such a background, and a coating agent for resin glass capable of forming a scratch-resistant coating film by a simple method, and a resin produced using this coating agent for resin glass. It is intended to provide glass.
- One aspect of the present invention is a component A comprising a urethane (meth)acrylate having an isocyanuric ring skeleton, A component B composed of a tri(meth)acrylate having an isocyanuric ring skeleton and no urethane bond; a C component consisting of colloidal silica having a (meth)acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms; and a D component consisting of a photoradical polymerization initiator,
- the content of component D is 0.1 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the film-forming components in total in the coating agent for resin glass.
- Another aspect of the present invention is a substrate made of a transparent resin, A resin glass comprising a coating film made of the cured resin glass coating agent of the above aspect and covering the surface of the base material.
- the resin glass coating agent (hereinafter referred to as "coating agent”) contains film-forming components including the A component to the C component and D component including a photoradical polymerization initiator.
- Each of the A component to the C component has a photoradical polymerizable functional group such as a (meth)acryloyl group. Therefore, the coating film can be formed by curing the film-forming component by a simple method of coating the coating agent on the substrate and then irradiating the coating agent with light to generate radicals from the component D. .
- the coating film formed by curing the coating agent has a network structure in which each component is three-dimensionally crosslinked. Colloidal silica derived from the C component is incorporated in this network structure. Therefore, the coating film obtained by curing the coating agent has excellent scratch resistance.
- the film-forming components in the coating agent include components A to C. By curing a coating agent containing these components, a coating film having excellent scratch resistance can be formed. Moreover, the coating film obtained by curing the coating agent has excellent adhesion to the substrate and excellent weather resistance. Each component contained in the coating agent will be described below.
- Component A Urethane (meth)acrylate having an isocyanuric ring skeleton
- the coating agent contains, as an essential component, an A component consisting of a urethane (meth)acrylate having an isocyanuric ring skeleton.
- the content of component A in the coating agent is preferably 3 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the film-forming component.
- the content of component A in the coating agent is more preferably 5 parts by mass or more and 55 parts by mass or less, and more preferably 10 parts by mass or more with respect to 100 parts by mass of the film-forming component. It is more preferably 50 parts by mass or less, and particularly preferably 15 parts by mass or more and 40 parts by mass or less.
- a compound represented by the following general formula (1) can be employed as component A.
- a compound represented by the following general formula (1) can be synthesized, for example, by an addition reaction between a nurate-type trimer of hexamethylene diisocyanate and a hydroxyalkyl (meth)acrylate or its ⁇ -caprolactone modified product.
- the A component one compound selected from these compounds may be used, or two or more compounds may be used in combination.
- R 1 , R 2 and R 3 in the general formula (1) are divalent organic groups having 2 to 10 carbon atoms.
- R 1 , R 2 and R 3 may be the same organic group or different organic groups.
- ⁇ -caprolactone-modified hydroxyalkyl (meth)acrylate is added to the nurate-type trimer of hexamethylene diisocyanate, —COCH 2 CH 2 CH 2 CH 2 CH 2 — is added to the aforementioned divalent organic group. or -OCOCH 2 CH 2 CH 2 CH 2 CH 2 CH 2 -.
- R 1 , R 2 and R 3 are preferably C 2-4 alkylene groups such as ethylene, trimethylene, propylene and tetramethylene, more preferably tetramethylene. In this case, the scratch resistance and weather resistance of the coating film can be further improved.
- R 4 , R 5 and R 6 in the general formula (1) are hydrogen atoms or methyl groups.
- R 4 , R 5 and R 6 may be the same or different from each other.
- R 4 , R 5 and R 6 are preferably hydrogen atoms. In this case, the curability of the coating agent can be further improved.
- the addition reaction between the nurate-type trimer of hexamethylene diisocyanate and the hydroxyalkyl (meth)acrylate or its ⁇ -caprolactone modified product may be carried out without using a catalyst, or using a catalyst to promote the reaction.
- catalysts that can be used include tin-based catalysts such as dibutyltin dilaurate and amine-based catalysts such as triethylamine.
- - Component B tri(meth)acrylate having an isocyanuric ring skeleton and no urethane bond as an essential component in the coating agent, from tri(meth)acrylate having an isocyanuric ring skeleton and no urethane bond It contains a B component.
- B component By blending the B component in the coating agent, it is possible to improve the weather resistance of the coating film after curing and improve the adhesion between the coating film and the substrate.
- the content of component B in the coating agent is preferably 10 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the film-forming component.
- scratch resistance, adhesion to substrates, and weather resistance can be improved in a well-balanced manner.
- the content of component B in the coating agent is more preferably 15 parts by mass or more and 50 parts by mass or less, and more preferably 20 parts by mass or more, relative to 100 parts by mass of the film-forming component. It is more preferably 45 parts by mass or less, and particularly preferably 30 parts by mass or more and 45 parts by mass or less.
- a compound represented by the following general formula (2) can be used as the B component.
- a compound represented by the following general formula (2) can be synthesized, for example, by a condensation reaction between an alkylene oxide adduct of isocyanuric acid and (meth)acrylic acid or its ⁇ -caprolactone modified product.
- one compound selected from these compounds may be used, or two or more compounds may be used in combination.
- R 7 , R 8 and R 9 in the general formula (2) may be the same organic group or different organic groups. Further, n 1 , n 2 and n 3 may be the same value or different values.
- the aforementioned divalent organic group is —COCH 2 CH 2 CH 2 CH 2 CH 2 — or —OCOCH 2 CH 2 CH 2 CH. Any substructure of 2 CH 2 — is included.
- R 7 , R 8 and R 9 in the general formula (2) are preferably an alkylene group having 2 to 4 carbon atoms such as ethylene, trimethylene, propylene and tetramethylene. It is more preferable to have In this case, the scratch resistance and weather resistance of the coating film can be further improved.
- n1 , n2 and n3 in the general formula ( 2 ) are preferably 1 . In this case, the adhesion of the coating film to the substrate can be further improved.
- R 10 , R 11 and R 12 in the general formula (2) are hydrogen atoms or methyl groups.
- R 10 , R 11 and R 12 may be the same or different from each other.
- R 10 , R 11 and R 12 are preferably hydrogen atoms. In this case, the curability of the coating agent can be further improved.
- the coating agent has a (meth)acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms as essential components. It contains a C component consisting of colloidal silica.
- the C component is preferably 4 or more and 8 or less.
- the content of component C in the coating agent is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and preferably 5 parts by mass or more with respect to 100 parts by mass of the film-forming component. more preferred. In this case, the scratch resistance of the coating film can be further improved.
- the content of component C in the coating agent is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, and 20 parts by mass or less per 100 parts by mass of the film-forming component. is more preferred.
- colloidal silica (c1) is prepared using a silane coupling agent (c2) having a (meth)acryloyl group and a silane coupling agent (c3) having a hydrocarbon group having 3 to 13 carbon atoms.
- a silane coupling agent (c2) having a (meth)acryloyl group and a silane coupling agent (c3) having a hydrocarbon group having 3 to 13 carbon atoms. can be used, such as surface-modified colloidal silica chemically modified.
- the colloidal silica (c1) used when producing component C may have, for example, an alcohol-based dispersion medium and silica primary particles dispersed in the alcohol-based dispersion medium.
- the primary silica particles may exist in the alcohol-based dispersion medium in a state of being separated from each other, or may exist as secondary particles formed by aggregation of a plurality of primary silica particles.
- the average primary particle diameter of the silica primary particles is preferably 1 nm or more and 50 nm or more, more preferably 1 nm or more and 30 nm or less.
- the average primary particle size of the silica primary particles is preferably 1 nm or more and 50 nm or more, more preferably 1 nm or more and 30 nm or less.
- the average primary particle size of silica primary particles can be calculated based on the specific surface area measured by the BET method. For example, when the average primary particle size of silica primary particles is 1 nm or more and 50 nm or less, the specific surface area measured by the BET method is 30 m 2 /g or more and 3000 m 2 /g or less.
- the silane coupling agent (c2) having a (meth)acryloyl group to be reacted with the colloidal silica (c1) includes, for example, 3-(meth)acryloyloxypropyltrimethoxysilane, 3-(meth)acryloyloxypropyltri Ethoxysilane, 2-(meth)acryloyloxyethyltrimethoxysilane, 2-(meth)acryloyloxyethyltriethoxysilane, 3-(meth)acryloyloxypropylmethyldimethoxysilane, 2-(meth)acryloyloxyethylmethyldimethoxysilane , vinyltrimethoxysilane, vinyltriethoxysilane, allyltrimethoxysilane, allyltriethoxysilane, and the like can be used.
- These silane coupling agents (c2) may be used alone or in combination of two or more.
- silane coupling agent (c3) having a hydrocarbon group having 3 to 13 carbon atoms to be reacted with the colloidal silica (c1) examples include propyltrimethoxysilane, isopropyltrimethoxysilane, butyltrimethoxysilane, cyclohexyltri Methoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, dodecyltrimethoxysilane, phenyltrimethoxysilane, and the like can be used.
- the number of carbon atoms in the hydrocarbon group in the silane coupling agent (c3) is preferably 4 or more and 8 or less. These silane coupling agents (c3) may be used alone or in combination of two or more.
- the amount of the silane coupling agent (c2) added is preferably 10 parts by mass or more and 40 parts by mass or less, and 10 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the primary silica particles. is more preferred.
- the amount of the silane coupling agent (c3) added is preferably more than 0 parts by mass and 100 parts by mass or less with respect to 100 parts by mass of the primary silica particles, and is preferably 5 parts by mass or more and 50 parts by mass or less. More preferably, it is 5 parts by mass or more and 20 parts by mass or less.
- the coating agent contains, as an essential component, a component D comprising a radical photopolymerization initiator.
- the D component can generate radicals in the coating agent by irradiating the coating agent with light of a specific wavelength determined according to the molecular structure of the D component. These radicals can initiate a polymerization reaction between photoradical polymerizable functional groups contained in the film-forming component such as (meth)acryloyl groups.
- the content of component D in the coating agent is 0.1 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the film-forming component.
- component D If the content of component D is less than 0.1 parts by mass, the amount of radicals that initiate the polymerization reaction is insufficient, making it difficult to sufficiently cure the coating agent. As a result, the hardness of the coating film is lowered, and there is a possibility that the resistance to scratches is lowered. Moreover, in this case, problems such as deterioration of adhesion of the coating film to the substrate and deterioration of weather resistance may occur.
- component D if the content of component D is excessively high, the storage stability of the coating agent may be reduced, such as the initiation of unintended radical polymerization reactions during storage of the coating agent.
- unreacted polymerization initiator tends to remain in the coating film after curing. Excessive amount of unreacted polymerization initiator remaining in the coating film may accelerate deterioration of the coating film. Furthermore, in this case, there is also a possibility of causing an increase in material costs.
- component D By setting the content of component D to 10 parts by mass or less, it is possible to sufficiently increase the amount of radicals that act as starting points for the polymerization reaction while avoiding the aforementioned problems, and to sufficiently cure the coating agent.
- component D examples include acetophenone compounds, benzophenone compounds, ⁇ -ketoester compounds, phosphine oxide compounds, benzoin compounds, titanocene compounds, acetophenone/benzophenone hybrid photoinitiators, and oxime ester photopolymerization initiators. and camphorquinone, etc. can be used.
- acetophenone compounds include 2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1 -[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane -1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, diethoxyacetophenone, oligo ⁇ 2-hydroxy-2-methyl-1-[4-( 1-methylvinyl)phenyl]propanone ⁇ and 2-hydroxy-1- ⁇ 4-[4-(2-hydroxy-2-methylpropionyl)benzyl]phenyl ⁇ -2-methylpropan-1-one.
- benzophenone-based compounds include benzophenone, 4-phenylbenzophenone, 2,4,6-trimethylbenzophenone and 4-benzoyl-4'-methyldiphenylsulfide.
- ⁇ -ketoester compounds include methylbenzoyl formate, 2-(2-oxo-2-phenylacetoxyethoxy)ethyl ester of oxyphenylacetic acid and 2-(2-hydroxyethoxy)ethyl ester of oxyphenylacetic acid. is mentioned.
- Phosphine oxide compounds include, for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2 , 4,4-trimethylpentylphosphine oxide and the like.
- benzoin compounds include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether and benzoin isobutyl ether.
- Acetophenone/benzophenone hybrid photoinitiators include, for example, 1-[4-(4-benzoylphenylsulfanyl)phenyl]-2-methyl-2-(4-methylphenylsulfinyl)propan-1-one and the like.
- oxime ester photopolymerization initiators include 2-(O-benzoyloxime)-1-[4-(phenylthio)]-1,2-octanedione and the like.
- one compound selected from these compounds may be used, or two or more compounds may be used in combination.
- the coating agent contains an E component consisting of a polyfunctional (meth)acrylate having a (meth)acrylic equivalent of 80 to 200. may be included.
- Component E has multiple (meth)acryloyl groups in one molecule. By polymerizing the (meth)acryloyl group of the E component with the (meth)acryloyl group contained in the A component, etc., a component having two or more molecules of the (meth)acryloyl group is bound to one molecule of the E component. can be done. Therefore, by curing the coating agent containing the E component, the network structure in the coating film can be made denser, and the abrasion resistance and impact resistance of the resin glass can be further improved.
- the content of component E in the coating agent is preferably 5 parts by mass or more and 50 parts by mass or less with respect to a total of 100 parts by mass of the film-forming components.
- the content of component E is more preferably 10 parts by mass or more, more preferably 15 parts by mass or more with respect to the total of 100 parts by mass of the film-forming components.
- the content of component E is more preferably 45 parts by mass or less, more preferably 40 parts by mass or less, relative to the total of 100 parts by mass of the film-forming components. preferable.
- component E a compound having 3 or more (meth)acryloyl groups per molecule and having a (meth)acrylic equivalent, that is, a molecular weight per (meth)acryloyl group of 80 to 200 is used. be able to.
- the E component one compound selected from these compounds may be used, or two or more compounds may be used in combination.
- the (meth)acrylic equivalent of the E component is less than 80, the number of (meth)acryloyl groups per molecule is excessively large, so the unreacted (meth)acryloyl contained in the coating film after curing The amount of base tends to be large. As a result, after the coating film is formed, an unintended cross-linking reaction may proceed in the coating film, making cracks more likely to occur.
- component E When the (meth)acrylic equivalent of component E is greater than 200, the number of (meth)acryloyl groups per molecule is reduced, so the number of crosslinking points contained in the coating film after curing tends to be insufficient. . In this case, the hardness of the coating film tends to decrease, which may lead to deterioration in wear resistance.
- Component F UV absorber
- the coating agent may contain, as an optional component, a component F comprising a UV absorber.
- the F component has the effect of suppressing deterioration of the coating film due to ultraviolet rays.
- the content of the F component can be appropriately set within a range of 1 part by mass or more and 12 parts by mass or less with respect to 100 parts by mass of the film-forming component. By setting the content of component F in the coating agent to 1 part by mass or more, the weather resistance of the cured coating film can be further improved.
- the content of the F component is excessively high, the abrasion resistance of the coating film may be lowered. Furthermore, in this case, the weather resistance of the coating film may rather deteriorate.
- the F component for example, triazine-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, inorganic fine particles that absorb ultraviolet rays, and the like can be used.
- triazine-based UV absorbers examples include 2-[4- ⁇ (2-hydroxy-3-dodecyloxypropyl)oxy ⁇ -2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl) -1,3,5-triazine, 2-[4- ⁇ (2-hydroxy-3-tridecyloxypropyl)oxy ⁇ -2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1 , 3,5-triazine, 2-[4- ⁇ (2-hydroxy-3-(2-ethylhexyloxy)propyl)oxy ⁇ -2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl )-1,3,5-triazine, 2,4-bis(2-hydroxy-4-butyroxyphenyl)-6-(2,4-bis-butyroxyphenyl)-1,3,5-triazine, 2 -(2-Hydroxy-4-[1-octyloxycarbonylethoxy
- benzotriazole-based UV absorbers examples include 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-(2-hydroxy-5- tert-butylphenyl)-2H-benzotriazole, 2-[2-hydroxy-5- ⁇ 2-(meth)acryloyloxyethyl ⁇ phenyl]-2H-benzotriazole and the like.
- Cyanoacrylate UV absorbers include, for example, ethyl-2-cyano-3,3-diphenyl acrylate and octyl-2-cyano-3,3-diphenyl acrylate.
- inorganic fine particles include titanium oxide fine particles, zinc oxide fine particles, and tin oxide fine particles.
- the F component one selected from the compounds and inorganic fine particles described above may be used, or two or more may be used in combination.
- the F component it is preferable to use a benzotriazole-based ultraviolet absorber having a (meth)acryloyl group. In this case, the scratch resistance and weather resistance of the coating film can be improved in a well-balanced manner.
- ⁇ Component G silicone-based surface control agent and fluorine-based surface control agent
- the coating agent contains, as an optional component, component G consisting of one or more compounds selected from silicone-based surface control agents and fluorine-based surface control agents.
- component G consisting of one or more compounds selected from silicone-based surface control agents and fluorine-based surface control agents.
- the content of the G component can be appropriately set within the range of 0.01 part by mass or more and 1 part by mass or less with respect to 100 parts by mass of the film-forming component. By setting the content of the G component in the coating agent to 0.01 parts by mass or more, the scratch resistance of the cured coating film can be further improved.
- the content of the G component in the coating agent is excessively high, the surface of the coating film may become rough after curing, resulting in poor appearance. Furthermore, when the content of the G component increases, there is also a risk of causing an increase in material costs. This problem can be avoided by setting the content of the G component to 1 part by mass or less.
- one or more compounds selected from silicone-based surface conditioners and fluorine-based surface conditioners can be used.
- silicone-based surface conditioners include silicone-based polymers and silicone-based oligomers having a silicone chain and a polyalkylene oxide chain, silicone-based polymers and silicone-based oligomers having a silicone chain and a polyester chain, EBECRYL350 and EBECRYL1360 (above, Daicel Allnex Co., Ltd.), BYK-315, BYK-349, BYK-375, BYK-378, BYK-371, BYK-UV3500, BYK-UV3570 (manufactured by BYK-Chemie Japan Co., Ltd.), X-22- 164, X-22-164AS, X-22-164A, X-22-164B, X-22-164C, X-22-164E, X-22-174DX, X-22-2426, X-22-2475 ( Above, manufactured by Shin-Etsu Chemical Co., Ltd.), AC-SQTA-100, AC-SQSI-20, MAC-
- fluorine-based surface conditioners include fluorine-based polymers and fluorine-based oligomers having a perfluoroalkyl group and a polyalkylene oxide group, and fluorine-based polymers and fluorine-based oligomers having a perfluoroalkyl ether group and a polyalkylene oxide group.
- Megafac RS-75, Megafac RS-76-E, Megafac RS-72-K, Megafac RS-76-NS, Megafac RS-90 (manufactured by DIC Corporation), OPTOOL DAC-HP ( Daikin Industries, Ltd.), ZX-058-A, ZX-201, ZX-202, ZX-212, ZX-214-A (manufactured by T&KTOKA Co., Ltd.) and the like can be used.
- "Megafac” is a registered trademark of DIC Corporation
- OPTOOL is a registered trademark of Daikin Industries, Ltd.
- the coating agent may contain an organic solvent for dissolving or dispersing each component described above.
- organic solvents include alcohols such as ethanol and isopropanol; alkylene glycol monoethers such as ethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, and propylene glycol monobutyl ether; toluene and xylene.
- esters such as propylene glycol monomethyl ether acetate, ethyl acetate, butyl acetate; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; ethers such as dibutyl ether; diacetone alcohol; be able to.
- the coating agent may contain one or more of these organic solvents.
- the coating agent preferably contains alkylene glycol monoether as an organic solvent. Since the alkylene glycol monoether is excellent in the dispersibility or solubility of each component described above, it is possible to form a uniform coating film after coating the coating agent on the substrate. Further, when the base material is made of polycarbonate, the coating film can be formed without dissolving the base material by using alkylene glycol monoether as the organic solvent.
- the coating agent may contain, in addition to the components A to D as essential components, additives for coating agents within a range that does not impair the curing of the coating agent.
- the coating agent may contain an additive for suppressing deterioration of the coating film, such as a radical scavenger and a hindered amine light stabilizer. By using these additives, the effect of improving the weather resistance of the coating film can be expected.
- the coating agent for resin glass By applying the coating agent for resin glass to the surface of a base material made of a transparent resin and then curing it, the surface of the base material is coated with the base material made of the transparent resin and the cured product of the coating agent for resin glass. It is possible to obtain a resin glass having a coating film to be applied.
- the coating film may be formed only on one side of the base material, or may be formed on both sides.
- the film thickness of the coating film is not particularly limited, it can be appropriately set within a range of, for example, 1 ⁇ m or more and 50 ⁇ m or less.
- the film thickness of the coating film is preferably 5 ⁇ m or more and 40 ⁇ m or less.
- the cured product of the coating agent is transparent, by forming the coating film on the surface of a substrate made of a transparent resin, it is possible to obtain resin glass that is lighter than inorganic glass.
- the coating film incorporates structural units derived from the C component in the network structure, it is possible to improve the scratch resistance of the resin glass.
- the transparent resin that constitutes the base material is not particularly limited, but polycarbonate, for example, can be used.
- Polycarbonate is excellent in various properties required for transparent window members, such as weather resistance, strength, and transparency.
- resin glass can be obtained.
- a preparation step of preparing a base material for example, a preparation step of preparing a base material; A coating step of applying a coating agent onto the surface of the substrate; A curing step in which radicals are generated from component D in the coating agent to cure the coating agent on the surface of the substrate; can be adopted.
- the coating agent is applied in the coating step by selecting a known coating device such as a spray coater, a flow coater, a spin coater, a dip coater, a bar coater, and an applicator to obtain the desired film thickness and substrate.
- a known coating device such as a spray coater, a flow coater, a spin coater, a dip coater, a bar coater, and an applicator to obtain the desired film thickness and substrate.
- Appropriate equipment can be selected and used according to the shape, etc.
- a process of heating and drying the coating agent may be performed as necessary.
- radicals can be generated from the D component by irradiating the coating agent with light of an appropriate wavelength determined according to the molecular structure of the D component.
- the coating film may be heated as necessary to accelerate curing.
- the embodiments of the coating agent and the resin glass according to the present invention are not limited to the embodiments shown below, and the configurations can be changed as appropriate without impairing the gist of the invention.
- the coating agent of this example includes an A component consisting of a urethane (meth)acrylate having an isocyanuric ring skeleton, a B component consisting of a tri(meth)acrylate having an isocyanuric ring skeleton and no urethane bond, and (meth) a C component consisting of colloidal silica having an acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms;
- a D component consisting of a photoradical polymerization initiator is included.
- the content of component D is 0.1 parts by mass or more and 10 parts by mass or less with respect to a total of 100 parts by mass of the film-forming components.
- the compounds used to prepare the coating agent in this example are as follows.
- a component A-1 addition product of nurate-type trimer of hexamethylene diisocyanate and hydroxyalkyl (meth) acrylate
- B component B-1 M-315 (manufactured by Toagosei Co., Ltd., isocyanuric acid ethylene oxide modified tri mixtures containing acrylates)
- ⁇ C component C-1 surface-modified colloidal silica having a (meth)acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms
- C-2 having a (meth)acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms
- C-3 surface-modified colloidal silica having a (meth)acryloyl group and a hydrocarbon group having 3 to 13 carbon atoms
- C-1 to C-3 are substances obtained by chemically modifying colloidal silica using a silane coupling agent.
- the method for producing C-1 to C-3 is specifically as follows.
- C-1> In a separable flask equipped with a reflux condenser, a thermometer and a stirrer, 333 parts by weight of colloidal silica having a silica concentration of 30% by weight (that is, 100 parts by weight as fine silica particles), 20 parts by weight of 3-methacryloyloxypropyltrimethoxysilane, After adding 0.35 parts by mass of p-methoxyphenol and 233 parts by mass of isopropanol, the mixture in the separable flask was heated while stirring.
- the colloidal silica used to prepare C-1 is specifically "IPA-ST" manufactured by Nissan Chemical Industries, Ltd. (dispersion medium: isopropanol, average primary particle size: 12.5 nm).
- C-2 The production method of C-2 is the same as that of C-1, except that the amount of 3-methacryloyloxypropyltrimethoxysilane added to the separable flask is changed to 10 parts by mass and the amount of hexyltrimethoxysilane is changed to 15 parts by mass. It is the same as the manufacturing method.
- the non-volatile content in the dispersion of C-2 obtained in this example was 30% by mass.
- C-3 The production method of C-3 is the same as that of C-1 except that the amount of 3-methacryloyloxypropyltrimethoxysilane added to the separable flask is changed to 10 parts by mass and the amount of hexyltrimethoxysilane is changed to 80 parts by mass. It is the same as the manufacturing method.
- the non-volatile content in the dispersion of C-3 obtained in this example was 30% by mass.
- E component E-1 Dipentaerythritol hexaacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd. "A-DPH", (meth) acrylic equivalent 96)
- maleimide silica Condensation product of alkoxysilane with maleimide group and (meth)acrylate group and colloidal silica
- Table 1 shows examples of compositions of coating agents (test agents 1 to 6) produced using these compounds.
- each component was dissolved or dispersed in an organic solvent at the mass ratio shown in Table 1, and the film-forming component, that is, A component to C component and E component total 100 0.1 parts by mass or more and 10 parts by mass or less of component D may be blended with respect to parts by mass.
- Test Agents 7 to 8 shown in Table 1 are test agents for comparison with Test Agents 1 to 6. The methods for preparing Test Agents 7 to 8 were the same as the methods for preparing Test Agents 1 to 6, except that the mass ratio of each component was changed as shown in Table 1.
- test agents 1 to 8 contain 1 part by mass or more and 12 parts by mass or less of an ultraviolet absorber (component F) and a film-forming agent with respect to a total of 100 parts by mass of film-forming components. 0.01 parts by mass or more and 1.0 parts by mass or less of the surface conditioner (G component) is contained with respect to a total of 100 parts by mass of the components.
- the ultraviolet absorbers used in this example are RUVA93 (manufactured by Otsuka Chemical Co., Ltd.) and Tinuvin479 (manufactured by BASF, hydroxyphenyltriazine-based ultraviolet absorber).
- the surface modifier used in this example is specifically 8019additive (manufactured by Dow Toray Industries, Inc., silicone-based surface modifier). "Tinuvin” is a registered trademark of BASF Corporation.
- a substrate is prepared for applying the coating agent.
- the substrate used in this example is a plate material made of polycarbonate and having a thickness of 5 mm.
- the substrate After applying the coating agent on one side of the substrate using a flow coater, the substrate is heated at a temperature of 100° C. for 10 minutes to dry the coating agent. After that, by generating radicals from component D in the coating agent, the coating agent can be cured to form a coating film.
- the test agent may be irradiated with ultraviolet light generated from a high-pressure mercury lamp with a peak illuminance of 300 mW/cm 2 .
- a resin glass can be obtained by forming a coating film made of a cured product of the test agent on one side of the base material.
- the scratch resistance and wear resistance of the coating film can be evaluated by the following methods.
- the scratch resistance of the coating film can be evaluated based on the gloss retention rate when a car wash test is performed.
- the car wash test is specifically carried out by the method specified in UN R43. That is, the car washing operation is repeated 10 times while spraying a suspension of 1.5 ⁇ 0.05 g of silica powder (average particle size 24 ⁇ m) per 1 L of water on the coating film on the base material. . Then, the ratio of the gloss ratio after the car wash test to the gloss ratio before the car wash test is defined as the gloss retention rate.
- the values shown in Table 1 are the gloss retention rates of the coating films obtained using each test agent.
- the abrasion resistance of the coating film can be evaluated based on the amount of increase ⁇ H (unit: %) in the haze value before and after the abrasion test.
- ⁇ H unit: %
- a wear wheel is used to wear the coating film on the resin glass.
- the abrasion wheel of the Taber abrasion tester in this example is CS-10F.
- the load in the wear test is 500 gf and the number of revolutions is 500 times.
- Test Agents 1 to 5 and Test Agent 7 which have approximately the same ratio of each component in Table 1, Test Agents 1 to 5 containing all of the components A to D described above are , showing a higher gloss retention than Test Agent 7, which has the same composition except that it does not contain the C component.
- Test Agent 6 and Test Agent 8 which contains all of the components A to D described above, has the same composition except that it does not contain Component C.
- high gloss retention From these results, it can be understood that the coating agent for resin glass containing the above components A to D has excellent scratch resistance.
- the resin glass coating agent containing the above-mentioned components A to D can be applied to a base material and then irradiated with light to cure the coating agent. It can be easily formed.
- test agents 1 to 6 among test agents 1 to 6, test agents 1 to 5 containing the above-described E component have a smaller increase in haze value after the abrasion test than test agent 6 that does not contain the E component. It can be understood that excellent wear resistance is exhibited.
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Abstract
Description
イソシアヌル環骨格を有し、ウレタン結合を有しないトリ(メタ)アクリレートからなるB成分と、
(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えたコロイダルシリカからなるC成分と、を含む膜形成成分と、
光ラジカル重合開始剤からなるD成分と、を含み、
前記D成分の含有量は、前記膜形成成分の合計100質量部に対して0.1質量部以上10質量部以下である、樹脂ガラス用コーティング剤にある。
前記の態様の樹脂ガラス用コーティング剤の硬化物からなり、前記基材の表面を被覆するコーティング膜と、を有する、樹脂ガラスにある。
前記コーティング剤における膜形成成分には、A成分~C成分が含まれている。これらの成分を含むコーティング剤を硬化させることにより、耐擦傷性に優れたコーティング膜を形成することができる。また、前記コーティング剤を硬化させてなるコーティング膜は、基材との密着性及び耐候性にも優れている。以下、コーティング剤に含まれる各成分について説明する。
前記コーティング剤中には、必須成分として、イソシアヌル環骨格を有するウレタン(メタ)アクリレートからなるA成分が含まれている。前記コーティング剤中にA成分を配合することにより、前記コーティング剤を硬化させてなるコーティング膜の耐候性を向上させることができる。
前記コーティング剤中には、必須成分として、イソシアヌル環骨格を有し、ウレタン結合を有しないトリ(メタ)アクリレートからなるB成分が含まれている。前記コーティング剤中にB成分を配合することにより、硬化後のコーティング膜の耐候性を向上させるとともに、コーティング膜と基材との密着性を向上させることができる。
前記コーティング剤は、必須成分として、(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えたコロイダルシリカからなるC成分を含有している。コーティング剤中にC成分を配合することにより、コーティング剤の硬化性を向上させるとともに、硬化後のコーティング膜の耐擦傷性、耐候性及び耐水性を向上させることができる。耐候性及び耐水性をより高める観点からは、炭化水素基の炭素数は、4以上8以下であることが好ましい。
前記コーティング剤中には、必須成分として、光ラジカル重合開始剤からなるD成分が含まれている。D成分は、コーティング剤に、D成分の分子構造に応じて定まる特定の波長の光を照射することにより、コーティング剤中にラジカルを発生させることができる。そして、このラジカルによって、(メタ)アクリロイル基等の膜形成成分中に含まれる光ラジカル重合性官能基同士の重合反応を開始させることができる。
前記コーティング剤中には、任意成分として、(メタ)アクリル当量80~200の多官能(メタ)アクリレートからなるE成分が含まれていてもよい。E成分は、1分子中に複数の(メタ)アクリロイル基を有している。E成分の(メタ)アクリロイル基がA成分等に含まれる(メタ)アクリロイル基と重合することにより、1分子のE成分に対して2分子以上の(メタ)アクリロイル基を有する成分を結合させることができる。それ故、E成分を含む前記コーティング剤を硬化させることにより、コーティング膜中の網状構造をよりち密にし、樹脂ガラスの耐摩耗性及び耐衝撃性をより向上させることができる。
前記コーティング剤は、任意成分として、紫外線吸収剤からなるF成分を含有していてもよい。F成分は、紫外線によるコーティング膜の劣化を抑制する作用を有している。F成分の含有量は、膜形成成分100質量部に対して1質量部以上12質量部以下の範囲から適宜設定することができる。前記コーティング剤中のF成分の含有量を1質量部以上とすることにより、硬化後のコーティング膜の耐候性をより向上させることができる。
前記コーティング剤は、任意成分として、シリコーン系表面調整剤およびフッ素系表面調整剤のうち1種以上の化合物からなるG成分を含有していてもよい。G成分の含有量は、膜形成成分100質量部に対して0.01質量部以上1質量部以下の範囲から適宜設定することができる。前記コーティング剤中のG成分の含有量を0.01質量部以上とすることにより、硬化後のコーティング膜の耐擦傷性をより向上させることができる。
前記コーティング剤は、前述した各成分を溶解または分散させるための有機溶媒を含んでいてもよい。有機溶媒としては、例えば、エタノールおよびイソプロパノール等のアルコール;エチレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル等のアルキレングリコールモノエーテル;トルエンおよびキシレン等の芳香族化合物;プロピレングリコールモノメチルエーテルアセテート、酢酸エチル、酢酸ブチル等のエステル;アセトン、メチルエチルケトンおよびメチルイソブチルケトン等のケトン;ジブチルエーテル等のエーテル;ジアセトンアルコール;N-メチルピロリドン等を使用することができる。前記コーティング剤は、これらの有機溶媒のうち1種を含んでいてもよく、2種以上を含んでいてもよい。
前記コーティング剤中には、必須成分としてのA成分~D成分の他に、コーティング剤の硬化を損なわない範囲で、コーティング剤用の添加剤が含まれていてもよい。例えば、前記コーティング剤中には、添加剤として、ラジカル捕捉剤、ヒンダードアミン系光安定剤等の、コーティング膜の劣化を抑制するための添加剤が含まれていてもよい。これらの添加剤を使用することにより、コーティング膜の耐候性を向上させる効果を期待することができる。
前記樹脂ガラス用コーティング剤を透明樹脂からなる基材の表面に塗布した後硬化させることにより、透明樹脂からなる基材と、前記樹脂ガラス用コーティング剤の硬化物からなり、基材の表面を被覆するコーティング膜と、を有する樹脂ガラスを得ることができる。基材が板状である場合には、コーティング膜は、基材の片面にのみ形成されていてもよいし、両面に形成されていてもよい。コーティング膜の膜厚は特に限定されることはないが、例えば、1μm以上50μm以下の範囲から適宜設定することができる。コーティング膜の膜厚は5μm以上40μm以下であることが好ましい。
基材の表面上にコーティング剤を塗布する塗布工程と、
コーティング剤中のD成分からラジカルを発生させ、基材の表面上においてコーティング剤を硬化させる硬化工程と、
を有する製造方法を採用することができる。
光ラジカル重合開始剤からなるD成分と、が含まれている。
D成分の含有量は、膜形成成分の合計100質量部に対して0.1質量部以上10質量部以下である。
A-1:ヘキサメチレンジイソシアネートのヌレート型三量体とヒドロキシアルキル(メタ)アクリレートとの付加生成物
・B成分
B-1:M-315(東亞合成株式会社製、イソシアヌル酸エチレンオキシド変性トリアクリレートを含む混合物)
C-1:(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えた表面修飾コロイダルシリカ
C-2:(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えた表面修飾コロイダルシリカ
C-3:(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えた表面修飾コロイダルシリカ
還流冷却器、温度計及び攪拌機を取り付けたセパラブルフラスコに、シリカ濃度30質量%のコロイダルシリカ333質量部(つまり、シリカ微粒子として100質量部)、3-メタクリロイルオキシプロピルトリメトキシシラン20質量部、p-メトキシフェノール0.35質量部及びイソプロパノール233質量部を入れた後、セパラブルフラスコ内の混合物を攪拌しながら昇温した。なお、C-1の作製に用いたコロイダルシリカは、具体的には、日産化学株式会社製「IPA-ST」(分散媒:イソプロパノール、平均一次粒子径:12.5nm)である。
C-2の作製方法は、セパラブルフラスコ内に添加する3-メタクリロイルオキシプロピルトリメトキシシランの量を10質量部、ヘキシルトリメトキシシランの量を15質量部に変更した以外は、C-1の作製方法と同様である。本例において得られたC-2の分散液中の不揮発分は30質量%であった。
C-3の作製方法は、セパラブルフラスコ内に添加する3-メタクリロイルオキシプロピルトリメトキシシランの量を10質量部、ヘキシルトリメトキシシランの量を80質量部に変更した以外は、C-1の作製方法と同様である。本例において得られたC-3の分散液中の不揮発分は30質量%であった。
Omnirad754(IGM Resins B.V.社製、フォスフィンオキサイド系光ラジカル重合開始剤)及びOmnirad819(IGM Resins B.V.社製、α-ケトエステル系化合物を含む光ラジカル重合開始剤)
E-1:ジペンタエリトリトールヘキサアクリレート(新中村化学工業株式会社製「A-DPH」、(メタ)アクリル当量96)
マレイミドシリカ:マレイミド基及び(メタ)アクリレート基を備えたアルコキシシランとコロイダルシリカとの縮合生成物
コーティング膜の耐擦傷性は、洗車試験を行った場合の光沢保持率に基づいて評価することができる。洗車試験は、具体的にはUN R43に規定された方法により実施する。すなわち、基材上のコーティング膜に、水1Lに対して1.5±0.05gのシリカ粉末(平均粒径24μm)を懸濁させた懸濁液を噴霧しながら洗車動作を10回繰り返し行う。そして、洗車試験前の光沢率に対する洗車試験後の光沢率の比率を百分率で表した値を、光沢保持率とする。各試験剤を用いて得られたコーティング膜の光沢保持率は表1に示した値となる。
コーティング膜の耐摩耗性は、摩耗試験前後でのヘイズ値の増加量ΔH(単位:%)に基づいて評価することができる。摩耗試験においては、予め試験前のヘイズ値を測定した樹脂ガラスをテーバー式摩耗試験機に取り付ける。そして、摩耗輪を用いて樹脂ガラス上のコーティング膜を摩耗させる。本例におけるテーバー式摩耗試験機の摩耗輪はCS-10Fである。また、摩耗試験における荷重は500gfとし、回転数は500回とする。
Claims (8)
- イソシアヌル環骨格を有するウレタン(メタ)アクリレートからなるA成分と、
イソシアヌル環骨格を有し、ウレタン結合を有しないトリ(メタ)アクリレートからなるB成分と、
(メタ)アクリロイル基および炭素数3~13の炭化水素基を備えたコロイダルシリカからなるC成分と、を含む膜形成成分と、
光ラジカル重合開始剤からなるD成分と、を含み、
前記D成分の含有量は、前記膜形成成分の合計100質量部に対して0.1質量部以上10質量部以下である、樹脂ガラス用コーティング剤。 - 前記膜形成成分の合計100質量部に対して、前記A成分の含有量は3質量部以上60質量部以下であり、前記B成分の含有量は10質量部以上50質量部以下であり、前記C成分の含有量は1質量部以上30質量部以下である、請求項1に記載の樹脂ガラス用コーティング剤。
- 前記膜形成成分には、さらに、(メタ)アクリル当量80~200の多官能(メタ)アクリレートからなるE成分が含まれている、請求項1または2に記載の樹脂ガラス用コーティング剤。
- 前記E成分の含有量は、前記膜形成成分の合計100質量部に対して5質量部以上50質量部以下である、請求項3に記載の樹脂ガラス用コーティング剤。
- 前記樹脂ガラス用コーティング剤は、さらに、紫外線吸収剤からなるF成分を含有しており、前記F成分の含有量は、前記膜形成成分の合計100質量部に対して1質量部以上12質量部以下である、請求項1~4のいずれか1項に記載の樹脂ガラス用コーティング剤。
- 前記樹脂ガラス用コーティング剤は、更に、シリコーン系表面調整剤およびフッ素系表面調整剤から選択される1種以上の化合物からなるG成分を含有しており、前記G成分の含有量は、前記膜形成成分の合計100質量部に対して0.01質量部以上1.0質量部以下である、請求項1~5のいずれか1項に記載の樹脂ガラス用コーティング剤。
- 透明樹脂からなる基材と、
請求項1~6のいずれか1項に記載の樹脂ガラス用コーティング剤の硬化物からなり、前記基材の表面を被覆するコーティング膜と、を有する、樹脂ガラス。 - 前記基材は前記透明樹脂としてのポリカーボネートから構成されている、請求項7に記載の樹脂ガラス。
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