WO2013108719A1 - 樹脂発泡体用のゴム強化スチレン系樹脂組成物及び樹脂発泡体 - Google Patents
樹脂発泡体用のゴム強化スチレン系樹脂組成物及び樹脂発泡体 Download PDFInfo
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- WO2013108719A1 WO2013108719A1 PCT/JP2013/050436 JP2013050436W WO2013108719A1 WO 2013108719 A1 WO2013108719 A1 WO 2013108719A1 JP 2013050436 W JP2013050436 W JP 2013050436W WO 2013108719 A1 WO2013108719 A1 WO 2013108719A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
- C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
- C08F279/04—Vinyl aromatic monomers and nitriles as the only monomers
-
- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/12—Copolymers of styrene with unsaturated nitriles
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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
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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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
- C08J2325/00—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 at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
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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
- C08J2425/00—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 at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
- C08J2425/08—Copolymers of styrene
- C08J2425/12—Copolymers of styrene with unsaturated nitriles
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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
- C08J2455/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2423/00 - C08J2453/00
- C08J2455/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention relates to a rubber-reinforced styrene-based resin composition for resin foam, and a resin foam obtained by foam-molding the resin composition.
- Rubber-reinforced styrene-based resins are used in a wide variety of applications such as residential building materials, household electrical appliances, and automotive interior and exterior parts because of their excellent mechanical strength and molding processability.
- resin foams such as weight reduction in automotive interior and exterior parts and wood replacement for residential building materials.
- foamed molded products of polyvinyl chloride resin hereinafter referred to as polyvinyl chloride resin
- polyvinyl chloride resin foamed molded products of polyvinyl chloride resin with a good balance between light resistance and practical strength have been used for furniture, building materials, and household goods.
- Patent Document 2 A low foam molding resin composition having improved light resistance by using acrylonitrile-acrylic rubber-styrene resin has been proposed (Patent Document 2). Furthermore, a foamed resin composition containing a polylactic acid resin and an organic filler has been proposed (Patent Document 3).
- JP 2011-1809 A Japanese Patent Laid-Open No. 7-18107 JP 2005-60689 A
- the recycled polyester resin described in Patent Document 1 has insufficient heat resistance and requires a complicated foam molding process.
- the resin composition described in Patent Document 2 is not sufficient in punching workability and lightness.
- the resin composition described in Patent Document 3 has a problem that lightness is not sufficient at a practical expansion ratio of 2 to 3 because the density of the unfoamed resin is large.
- the present inventors have not only been excellent in light weight, light resistance and foam appearance by using a specific rubber-reinforced styrene-based resin and copolymer, but also have punching workability.
- the present inventors have found that a rubber-reinforced styrene-based resin composition for resin foam can be obtained.
- the present invention involves bulk polymerization of a rubber-like polymer, an aromatic vinyl monomer and a vinyl cyanide monomer, and if necessary, other monomers copolymerizable with these monomers.
- the rubber-like polymer obtained and contained has a rubber-reinforced styrene resin (A) having a weight average particle diameter of 0.7 to 3 ⁇ m of 10 to 99% by weight, an aromatic vinyl monomer and a vinyl cyanide 1 to 90% by weight of a copolymer (B) obtained by copolymerizing a monomer and, if necessary, other monomers copolymerizable with these monomers (rubber reinforced styrene resin (A)
- the ratio of the skin layer thickness to the thickness of the resin foam is 0.3 to 20%, and the specific gravity is 0.3 to A rubber-reinforced styrene-based resin composition for a resin foam of 0.7, and the resin composition A resin foam body obtained by.
- the rubber-reinforced styrene-based resin composition for resin foam which is not only excellent in light weight, light resistance and foam appearance but also excellent in punching workability, and obtained by foam molding the resin composition. Resin foam can be obtained.
- the rubber-reinforced styrene-based resin composition of the present invention comprises a rubber-reinforced styrene-based resin (A) and a copolymer (B) as essential components, and if necessary, a reinforcing agent, a filler, an antioxidant, a heat stabilizer, an ultraviolet ray It is a resin composition comprising additives such as an absorbent and a lubricant.
- the rubber-reinforced styrene resin (A) is an aromatic vinyl monomer and a vinyl cyanide resin in the presence of a rubbery polymer. It can be obtained by bulk polymerization of monomers and, if necessary, other monomers copolymerizable with these monomers.
- the rubbery polymer used in the rubber-reinforced styrene resin (A) is not particularly limited, but polybutadiene rubber, styrene-butadiene rubber (SBR), styrene-butadiene-styrene (SBS) block copolymer, styrene- ( Ethylene-butadiene) -styrene (SEBS) block copolymer, acrylonitrile-butadiene rubber (NBR), diene rubber such as butyl acrylate-butadiene, butyl acrylate rubber, butadiene-butyl acrylate rubber, 2-ethylhexyl acrylate-butyl acrylate rubber, Acrylic rubber such as 2-ethylhexyl methacrylate-butyl acrylate rubber, stearyl acrylate-butyl acrylate rubber, polyorganosiloxane-butyl acrylate composite rubber, ethylene-prop
- the aromatic vinyl monomers constituting the rubber-reinforced styrene resin (A) include styrene, ⁇ -methylstyrene, o-methylstyrene, p-methylstyrene, vinyltoluene, methyl- ⁇ -methylstyrene, brominated Styrene and the like can be mentioned, and one or more can be used, and styrene and ⁇ -methylstyrene are particularly preferable.
- Examples of the vinyl cyanide monomer constituting the rubber-reinforced styrene resin (A) include acrylonitrile and methacrylonitrile, with acrylonitrile being particularly preferred.
- the other copolymerizable monomer includes at least one monomer selected from the group of (meth) acrylic acid ester monomers, unsaturated carboxylic acid monomers, and maleimide monomers.
- a monomer is mentioned.
- the (meth) acrylic acid ester monomer include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and the like, and methyl methacrylate is particularly preferable.
- Examples of the unsaturated carboxylic acid monomer include acrylic acid, methacrylic acid, (anhydrous) maleic acid, fumaric acid, itaconic acid, and the like, and (meth) acrylic acid and (anhydrous) maleic acid are preferable.
- Examples of the maleimide monomer include maleimide, N-methylmaleimide, N-phenylmaleimide, N- (2-methylphenyl) maleimide, N- (4-hydroxyphenyl) maleimide, N-cyclohexylmaleimide, In particular, N-phenylmaleimide and N-cyclohexylmaleimide are preferable.
- the rubber-like polymer and each monomer constituting the rubber-reinforced styrene resin (A) are a rubber-like polymer in 100 parts by weight of the rubber-reinforced styrene resin (A) from the viewpoint of punching processability of the resin foam. 10 to 40 parts by weight, aromatic vinyl monomer 40 to 80 parts by weight, vinyl cyanide monomer 10 to 50 parts by weight, other monomers copolymerizable with these monomers Is preferably contained in an amount of 0 to 40 parts by weight.
- the weight average particle diameter of the rubber-like polymer contained in the rubber-reinforced styrene resin (A) used in the present invention is a weight average from the viewpoint of simultaneously realizing weight reduction and punching workability without increasing the thickness of the skin layer.
- the particle diameter needs to be 0.7 to 3.0 ⁇ m. From the viewpoint of punching workability, the weight average particle diameter is preferably 0.8 to 2.7 ⁇ m.
- the weight-average particle diameter of the rubber-like polymer depends on the stirring strength, reaction temperature, and amount of organic peroxide in the reaction vessel that particles the rubber-like polymer in the course of producing the rubber-reinforced styrene resin (A). Can be adjusted.
- the particle size is reduced by increasing the stirring strength, the particle size is increased if the reaction temperature is increased, and the particle size tends to be decreased when the amount of the organic peroxide is increased.
- the weight average particle diameter of the rubber-like polymer can be adjusted.
- the weight average particle size of the rubber-like polymer contained in the rubber-reinforced styrene resin (A) is a solution obtained by dissolving the rubber-reinforced styrene resin (A) in methyl ethyl ketone using a laser diffraction particle size distribution analyzer. It refers to the weight average particle size obtained when
- the rubber-reinforced styrene resin (A) used in the present invention must be obtained by a bulk polymerization method.
- the rubber-reinforced styrene-based resin (A) obtained by the bulk polymerization method is composed of an aromatic vinyl monomer and a vinyl cyanide monomer and, if necessary, other monomers copolymerizable with these monomers. And a dispersed phase component which is a rubbery polymer obtained by grafting the monomer onto a rubbery polymer and occluded the copolymer.
- the rubber-like polymer has a feature that the weight average particle diameter is large, and the resin foam has a feature that it is excellent in punching processability.
- the copolymer (B) which is one of the components constituting the rubber-reinforced styrene resin composition of the present invention, contains an aromatic vinyl monomer and a vinyl cyanide monomer, and if necessary, these monomers. It is a copolymer with other monomers that can be copolymerized with the monomer, and is polymerized by a conventionally known polymerization technique such as an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or a solution polymerization method. be able to. Copolymers obtained by the respective polymerization methods may be combined, or one or more copolymers may be combined.
- Examples of the monomer constituting the copolymer (B) include aromatic vinyl monomers and vinyl cyanide monomers, and other copolymerizable monomers, each of which is a rubber-reinforced styrene resin.
- the monomer exemplified in the item (A) can be used.
- the ratio of each monomer constituting the copolymer (B) is not particularly limited, but when the total amount of the monomers constituting the copolymer (B) is 100 parts by weight, the polymerization productivity and From the viewpoint of colorability, the aromatic vinyl monomer is 50 to 85 parts by weight, the vinyl cyanide monomer is 15 to 50 parts by weight, and other copolymerizable monomers are 0 to 35 parts by weight. It is preferable.
- the copolymer (B) used in the present invention is related to foamability and foam strength when foam-molding a rubber-reinforced styrene resin composition, and melt kneading torque of the rubber-reinforced styrene resin composition. And it has a role which adjusts content of a rubber-like polymer.
- the molecular structure of the copolymer (B) may be either linear or branched, but the die swell ratio measured at 220 ° C. and 10 kg is preferably 1.3 to 4.0.
- the die swell ratio of the copolymer (B) is in the above range, the balance between the resin pressure and the melted resin viscosity during foam molding is good, and closed cell cells are easily formed, and the foam appearance and punching processability are improved.
- the die swell ratio is 1.4 to 3.6.
- the rubber-reinforced styrene-based resin composition of the present invention contains the rubber-reinforced styrene-based resin (A) and the copolymer (B) as essential components, and may contain additives as necessary. From the viewpoint of properties, when the total of the rubber-reinforced styrene resin (A) and the copolymer (B) is 100% by weight, the rubber-reinforced styrene resin (A) is 10 to 99% by weight, and the copolymer (B ) Must be in the proportion of 1 to 90% by weight.
- the rubber-reinforced styrene resin (A) is preferably 20 to 80% by weight, and the copolymer (B) is preferably 20 to 80% by weight.
- the rubber-reinforced styrene resin (A) is preferably 30 to 75% by weight, More preferably, the blend (B) is 25 to 70% by weight.
- the amount of the rubber-like polymer contained in the rubber-reinforced styrene resin composition is not particularly limited, but from the viewpoint of light resistance and punching processability, the rubber-like polymer. Is preferably contained in an amount of 3 to 15% by weight, more preferably 5 to 12% by weight.
- the melt kneading torque of the rubber-reinforced styrene-based resin composition of the present invention is not particularly limited, but from the viewpoint of extrusion foam appearance, the melt kneading torque at 180 ° C. is preferably 10 to 30 N ⁇ m, and 15 to 25 N ⁇ m. More preferably, it is m.
- the melt kneading torque is an index of the relative viscosity of the molten resin at a constant temperature, and has a close relationship with the resin shear heat generation in extrusion foam molding. In extrusion foam molding, it is necessary to cool the molten resin containing the foaming gas extruded from the die in order to give a desired shape. However, a resin composition having a high melting torque has a friction with the screw rotation of the extruder. Since it becomes large, it tends to generate heat, and as a result, cooling becomes insufficient, and the extruded foam appearance deteriorates.
- the rubber-reinforced styrene resin composition of the present invention includes a light stabilizer, a hindered phenol, a sulfur-containing organic compound, an antioxidant such as a phosphorus-containing organic compound, a phenol, Thermal stabilizers such as acrylates, benzotriazoles, benzophenones, salicylates UV absorbers, polyolefin waxes, fatty acid metal salts, organic nickels, lubricants such as higher fatty acid amides, plasticizers such as phosphate esters, Flame retardants and flame retardants such as polybromophenyl ether, tetrabromobisphenol-A, brominated epoxy oligomers, brominated, polycarbonate polycarbonate oligomers and other halogen-containing compounds, phosphorus compounds, antimony trioxide, carbon black, oxidation Colorants such as titanium, pigments and dyes, odor masking agents, talc Calcium carbonate, aluminum hydroxide, glass fibers, glass flakes,
- the light stabilizer is 0.05 with respect to 100 parts by weight of the resin including the rubber-reinforced styrene-based resin (A) and the copolymer (B). It is preferable to use ⁇ 0.8 parts by weight, it is preferable to use 0.05 to 0.3 parts by weight of the antioxidant, 0.01 to 0.4 parts by weight of the ultraviolet absorber, and 0% of the lubricant. It is preferable to use 5 to 5 parts by weight, and it is preferable to use 1 to 20 parts by weight of the filler.
- the foaming agent used in the rubber-reinforced styrene resin composition of the present invention is not particularly limited as long as it is used as a foaming agent for resin.
- foaming agents for resins gases such as air, water, nitrogen, carbon dioxide, butane gas, pentane and chlorofluorocarbon, inorganic foaming agents such as carbonates and bicarbonates, isocyanates, azo compounds, hydrazine derivatives, semicarbazide compounds
- organic foaming agents such as azide compounds, nitroso compounds, and triazole compounds such as p, p′-oxy-bis (benzenesulfonylhydrazide), azodicarbonamide, sodium hydrogen carbonate, and the like.
- foaming agent used by this invention in the state of the masterbatch which kneaded these foaming agents in resin.
- the addition amount of the foaming agent is adjusted according to the target foaming ratio, but it is preferably 0.01 to 5 parts by weight based on 100 parts by weight of the rubber-reinforced styrene resin composition of the present invention. It is more preferable to use 3 parts by weight.
- the method of mixing the components such as the rubber-reinforced styrene resin (A), the copolymer (B), and the additive, and the mixture of these components is converted into a single screw extruder or a twin screw extruder.
- Etc. such as an extruder, a Banbury mixer, a kneader / ruder, a pressure kneader, and a heating roll.
- the rubber-reinforced styrene resin composition of the present invention has a ratio of the skin layer thickness to the resin foam thickness of 0.3 to 20% and a resin foam having a specific gravity of 0.3 to 0.7.
- the skin layer refers to the surface layer portion from the density boundary of the foam cells observed in the cross section of the foam, and affects the specific gravity and mechanical strength of the entire foam.
- the skin layer thickness is less than 0.3% with respect to the thickness of the resin foam, even if a foam molded article is obtained using the rubber-reinforced styrene resin composition of the present invention, the obtained foam molded article is Inferior to punching workability and rigidity.
- the specific gravity of the foamed molded product increases, so that not only the light weight is inferior but also the punching processability is inferior. If the specific gravity is less than 0.3, it is impossible to obtain the rigidity sufficient for practical use as a resin foam, and if the specific gravity exceeds 0.7, the existing resin foam made of polyvinyl chloride resin to be replaced Therefore, the rubber-reinforced styrene-based resin composition of the present invention is used for a resin foam having a specific gravity of 0.3 to 0.7.
- the size and shape of the foam molded article obtained from the rubber-reinforced styrene resin composition of the present invention is not particular limitation.
- a blind slat a flat plate having a thickness of 1.5 to 3 mm and a width of 20 to 60 mm is used.
- the heat-insulating building material include a plate-like foam molded body having a thickness of 3 to 50 mm.
- the resin composition can be foamed, in order to further improve the appearance and rigidity of the resin foam, it is possible to obtain a resin foam by an extrusion foam molding method by a SELKA process in which the thickness of the skin layer is easy to control.
- the thickness of the skin layer can be controlled by changing the molding conditions such as the resin temperature and cooling temperature in addition to the die and sizing mold structure, and the resin temperature at the die outlet can be lowered and further cooled rapidly by the sizing die. With this, the skin layer can be thickened.
- Rubber reinforced styrene resin (A-1) 64.4 parts of styrene, 10.6 parts of acrylonitrile, 10 parts of ethylbenzene, 15 parts of styrene-butadiene rubber, 0.2 part of t-dodecyl mercaptan, 1,1-bis (t-butylperoxy) 3, 3, 5-
- a rubber-reinforced styrene resin (A-1) having a composition ratio of styrene / butadiene rubber 18%, styrene 67%, acrylonitrile 15% was prepared by preparing a raw material composed of 0.05 part of trimethylcyclohexane and using a known bulk polymerization method. Obtained.
- the obtained rubber-reinforced styrene resin (A-1) was dissolved in methyl ethyl ketone (0.01 g / ml), and the weight average particle size was measured with a laser light diffraction particle size distribution analyzer (SALD-1100 manufactured by Shimadzu Corporation).
- SALD-1100 laser light diffraction particle size distribution analyzer manufactured by Shimadzu Corporation.
- the weight average particle diameter of the rubber-like polymer of the rubber-reinforced styrene resin (A-1) was 0.9 ⁇ m.
- Rubber reinforced styrene resin (A-2) 60.5 parts of styrene, 19.2 parts of acrylonitrile, 10 parts of ethylbenzene, 10.4 parts of styrene-butadiene rubber, 0.2 part of t-dodecyl mercaptan, 1,1-bis (t-butylperoxy) 3, 3, 3,
- the weight average particle diameter of the rubber-like polymer of the obtained rubber reinforced styrene resin (A-2) by the same method as that for the rubber reinforced styrene resin (A-1) was 2. .3 ⁇ m.
- Rubber reinforced styrene resin (A-3) In a reactor purged with nitrogen, 50 parts (solid content) of a styrene-butadiene rubber latex having a weight average particle size of 0.4 ⁇ m, 150 parts of water, 0.1 part of ethylenediaminetetraacetic acid disodium salt, ferrous sulfate 0. Add 001 parts, 0.3 parts of sodium formaldehyde sulfoxylate, heat to 60 ° C., and continuously add a mixture of 35 parts of styrene, 15 parts of acrylonitrile and 0.2 parts of cumene hydroperoxide over 3 hours. Further, polymerization was carried out at 60 ° C. for 2 hours.
- A-3 rubber-reinforced styrene resin having a composition ratio of 50% styrene / butadiene rubber, 35% styrene, and 15% acrylonitrile.
- Copolymer (B-1) Copolymer (B-1) comprising 75% styrene and 25% acrylonitrile and having a reduced viscosity of 1.15 (measured using a dimethylformamide solvent at a solution concentration of 0.4 g / dl) by a known emulsion polymerization method.
- Copolymer (B-2) Copolymer (B-2) comprising 75% styrene and 25% acrylonitrile by a known emulsion polymerization method and having a reduced viscosity of 7.50 (measured using a dimethylformamide solvent at a solution concentration of 0.4 g / dl).
- Copolymer (B-3) Copolymer (B-3) comprising 75% styrene and 25% acrylonitrile and having a reduced viscosity of 0.44 (measured using a dimethylformamide solvent at a solution concentration of 0.4 g / dl) by a known bulk polymerization method.
- Additives Inorganic filler Crown Talc PP manufactured by Matsumura Sangyo Co., Ltd.
- Light stabilizer ADEKA Corporation ADK STAB LA-77Y UV absorber: Sumitomo 200 manufactured by Sumitomo Chemical Co., Ltd.
- Lubricant Nippon Oil & Fats Co., Ltd.
- Alflow H50S Colorant RTC-30 (titanium oxide) manufactured by Tioxide Foaming agent Azodicarbonamide foaming agent: Sankyo Kasei Co., Ltd. Cellmic MB9043
- TM-181FSJ titanium-based stabilizer
- polyethylene wax 1 part of TM-181FSJ (tin-based stabilizer) manufactured by Katsuta Kako Co., Ltd., and 0.5 parts of polyethylene wax are used per 100 parts of polyvinyl chloride resin (manufactured by Taiyo PVC Co., Ltd., TH-700, degree of polymerization 700).
- 0.2 parts of calcium stearate and 2 parts of a colorant (titanium dioxide) were mixed, and then mixed for 5 minutes with a mixer to obtain a polyvinyl chloride resin composition (PVC).
- Examples 1 to 10 100 parts of the rubber-reinforced styrene-based resin composition (1-10) obtained was blended with 1 part of a foaming agent, and the cylinder temperature was measured with a non-vent extruder equipped with a SELKA process flat plate die and a sizing die at the tip. Extrusion was performed under the conditions of 220 ° C., die temperature 150 ° C., sizing die temperature 130 ° C., screw rotation speed 30 rpm, and sufficiently cooled and solidified in a water tank to obtain a resin foam having a width of 50.8 mm and a thickness of 3 mm.
- Comparative Example 1 A resin foam having a width of 50.8 mm and a thickness of 3 mm was obtained by performing foam molding under the same conditions as in Example 1 except that the rubber-reinforced styrene resin composition 11 was used.
- Comparative Example 2 A resin foam having a width of 50.8 mm and a thickness of 3 mm was obtained by performing foam molding under the same conditions as in Example 1 except that the die temperature was 180 ° C. and the sizing temperature was 160 ° C.
- Comparative Example 3 A resin foam having a width of 50.8 mm and a thickness of 3 mm was obtained by performing foam molding under the same conditions as in Example 1 except that the die temperature was 145 ° C. and the sizing temperature was 110 ° C.
- Comparative Example 4 A resin foam having a width of 50.8 mm and a thickness of 3 mm was obtained by performing foam molding under the same conditions as in Example 1 except that the polyvinyl chloride resin composition (PVC) was used.
- PVC polyvinyl chloride resin composition
- melt kneading torque Using a lab plast mill (4C150 type, mixer type R60) manufactured by Toyo Seiki Seisakusho Co., Ltd., the torque value after kneading for 5 minutes at a filling amount of 55.5 g, a preheating time of 1 minute, and a rotation speed of 30 rpm.
- the melt-kneading torque of the rubber-reinforced styrene resin composition was used.
- the cross sections of the resin foams obtained in the examples and comparative examples were enlarged and observed with an optical microscope, and the part where the density of the foam cells changed was obtained. From the surface of the resin foam to the part where the density changed. was the skin layer thickness. By determining the skin layer thickness, the ratio of the skin layer thickness to the thickness of the resin foam was determined.
- the obtained resin foam was irradiated for 40 hours at a test piece temperature of 60 ° C. and an irradiance of 2.5 mW / cm 2 using a light resistance tester (Ubucon manufactured by Toyo Seiki Seisakusho Co., Ltd.). .
- the hue change before and after the irradiation was evaluated with a gray scale for JIS L0804 color fading.
- B Minor hue change (Grayscale grade 3-4)
- C Acceptable hue change (Grayscale level 3)
- D Unacceptable hue change (grayscale grade 2 or less)
- the specific gravity of the resin foam was measured using an electronic hydrometer (MD-200S manufactured by Alpha Mirage Co., Ltd.).
- the rubber-reinforced styrene-based resin composition of the present invention is excellent not only in lightness, light resistance and foam appearance but also in punching workability. Moreover, when the rubber-reinforced styrene-type resin composition which has a specific structure is used, it turns out that all of these characteristics are the results excellent. In particular, by comparing with Comparative Example 4, it is superior in lightness, foam appearance, and punching workability as compared with the case of using a polyvinyl chloride resin composition, and is excellent as an alternative material for polyvinyl chloride resin. I understand that.
- Comparative Example 1 when the rubber-reinforced styrene resin (A) not obtained by the bulk polymerization method was used, the punching processability was inferior. As shown in Comparative Example 2, even when the rubber-reinforced styrene-based resin composition 2 was used, when the skin layer thickness of the foamed molded product was less than 0.3% with respect to the thickness of the foamed molded product, the foam appearance And punching workability were inferior.
- the rubber-reinforced styrene-based resin composition of the present invention can easily obtain a resin foam that is excellent not only in lightness, light resistance and foam appearance but also in punching workability. There is high utility value as a resin composition for resin foams.
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Description
本発明のゴム強化スチレン系樹脂組成物はゴム強化スチレン系樹脂(A)と共重合体(B)を必須成分として、必要に応じて補強剤、充填剤、酸化防止剤、熱安定剤、紫外線吸収剤、滑剤等の添加剤を含むことを特徴とする樹脂組成物である。
本発明のゴム強化スチレン系樹脂組成物を構成する成分の一つである、ゴム強化スチレン系樹脂(A)は、ゴム状重合体の存在下に芳香族ビニル系単量体及びシアン化ビニル系単量体、必要に応じてこれらの単量体と共重合可能な他の単量体を塊状重合することで得ることが出来る。
本発明のゴム強化スチレン系樹脂組成物を構成する成分の一つである共重合体(B)は、芳香族ビニル系単量体及びシアン化ビニル系単量体、必要に応じてこれらの単量体と共重合可能な他の単量体との共重合体であり、従来公知の重合技術、例えば乳化重合法、塊状重合法、懸濁重合法、溶液重合法などの重合法により重合することができる。それぞれの重合方法で得られた共重合体を組合せても良く、1種又は2種以上の共重合体を組み合わせても良い。
スチレン64.4部、アクリロニトリル10.6部、エチルベンゼン10部、スチレン・ブタジエンゴム15部、t-ドデシルメルカプタン0.2部、1、1-ビス(t-ブチルパーオキシ)3、3、5-トリメチルシクロヘキサン0.05部からなる原料を調整し、公知の塊状重合法により、スチレン・ブタジエンゴム18%、スチレン67%、アクリロニトリル15%の組成比率を有するゴム強化スチレン系樹脂(A-1)を得た。得られたゴム強化スチレン系樹脂(A-1)をメチルエチルケトンに溶解(0.01g/ml)し、レーザー光回折粒度分布測定装置(島津製作所製 SALD-1100)により重量平均粒子径を測定した。ゴム強化スチレン系樹脂(A-1)のゴム状重合体の重量平均粒子径は0.9μmであった。
スチレン60.5部、アクリロニトリル19.2部、エチルベンゼン10部、スチレン-ブタジエンゴム10.4部、t-ドデシルメルカプタン0.2部、1、1-ビス(t-ブチルパーオキシ)3、3、5-トリメチルシクロヘキサン0.05部からなる原料を調整した以外は上記と同様の方法で重合を行い、スチレン・ブタジエンゴム14%、スチレン65%、アクリロニトリル21%の組成比率を有するゴム強化スチレン系樹脂(A-2)を得た。ゴム強化スチレン系樹脂(A-1)と同様の方法で、得られたゴム強化スチレン系樹脂(A-2)のゴム状重合体の重量平均粒子径を測定した結果、重量平均粒子径は2.3μmであった。
窒素置換した反応器に、重量平均粒子径が0.4μmであるスチレン-ブタジエンゴムラテックス50部(固形分)、水150部、エチレンジアミン四酢酸二ナトリウム塩0.1部、硫酸第1鉄0.001部、ナトリウムホルムアルデヒドスルホキシレート0.3部を入れ、60℃に加熱後、スチレン35部、アクリロニトリル15部及びキュメンハイドロパーオキサイド0.2部からなる混合物を3時間に亘り連続的に添加し、更に60℃で2時間重合した。その後、塩析・脱水・乾燥することで、スチレン・ブタジエンゴム50%、スチレン35%、アクリロニトリル15%の組成比率を有するゴム強化スチレン系樹脂(A-3)を得た。
公知の乳化重合法により、スチレン75%、アクリロニトリル25%からなり、還元粘度が1.15(ジメチルホルムアミド溶媒を用い、溶液濃度0.4g/dlで測定)である共重合体(B-1)を得た。
公知の乳化重合法により、スチレン75%、アクリロニトリル25%からなり、還元粘度は7.50(ジメチルホルムアミド溶媒を用い、溶液濃度0.4g/dlで測定)である共重合体(B-2)を得た。
公知の塊状重合法により、スチレン75%、アクリロニトリル25%からなり、還元粘度が0.44(ジメチルホルムアミド溶媒を用い、溶液濃度0.4g/dlで測定)である共重合体(B-3)を得た。
無機充填剤:松村産業(株)製 クラウンタルクPP
光安定剤:ADEKA(株)製 アデカスタブLA-77Y
紫外線吸収剤:住友化学(株)製 スミソーブ200
滑剤:日本油脂(株)製 アルフローH50S
着色剤:Tioxide社製 RTC-30(酸化チタン)
発泡剤
アゾジカルボンアミド系発泡剤:三協化成(株)製 セルマイクMB9043
得られたゴム強化スチレン系樹脂組成物(1~10)100部に対して、発泡剤を1部配合し、先端にセルカプロセス平板形状ダイス及びサイジングダイを備えたノンベント押出機にて、シリンダー温度220℃、ダイス温度150℃、サイジングダイ温度130℃、スクリュー回転数30rpmの条件で押出し、水槽で十分に冷却固化させることで、幅50.8mm、厚さ3mmの樹脂発泡体を得た。
ゴム強化スチレン系樹脂組成物11を使用した以外は、実施例1と同じ条件で発泡成形を行うことで、幅50.8mm、厚さ3mmの樹脂発泡体を得た。
ダイス温度を180℃、サイジング温度を160℃にした以外は、実施例1と同じ条件で発泡成形を行うことで、幅50.8mm、厚さ3mmの樹脂発泡体を得た。
ダイス温度を145℃、サイジング温度を110℃にした以外は、実施例1と同じ条件で発泡成形を行うことで、幅50.8mm、厚さ3mmの樹脂発泡体を得た。
ポリ塩化ビニル樹脂組成物(PVC)を使用した以外は、実施例1と同じ条件で発泡成形を行うことで、幅50.8mm、厚さ3mmの樹脂発泡体を得た。
(株)東洋精機製作所製 セミオートメルトインデックサを用い、220℃、10kg、オリフィス直径2.095mmの条件で押出されたストランドの直径をノギスで測定し、ストランド直径をオリフィス直径で除した数値を共重合体(B)のダイスウェル比とした。
共重合体(B)が2種以上の場合は、それぞれの比率で配合し、(株)東洋精機製作所製 ラボプラストミルにて200℃、30rpm、2分混練して得られた組成物を同様に測定した。
(株)東洋精機製作所製ラボプラストミル(4C150型、ミキサー型式R60)を用い、充填量55.5g、予熱時間1分、回転数30rpmにて5分混練後のトルク値をゴム強化スチレン系樹脂組成物の溶融混練トルクとした。
実施例及び比較例で得られた樹脂発泡体の断面を光学顕微鏡で拡大観察し、発泡セルの密度が変化する部分を求め、樹脂発泡体の表面から密度が変化した部分までの距離をスキン層厚みとした。スキン層厚みを求めることで、樹脂発泡体の厚みに対するスキン層厚みの割合を求めた。
得られた発泡成形体の表面を目視で評価した。
A:表面光沢があり、成形体の形状がダイス形状のとおり正確に形成されている。
B:表面光沢がやや劣るが、成形体の形状はダイス形状のとおり正確に形成されている。
C:表面光沢が劣るが、成形体のエッジ部の形状はダイス形状のとおり形成されている。
D:表面光沢がなく、成形体のエッジ部が荒れ、ダイス形状のとおり形成されていない。
得られた発泡成形体をアクリル樹脂板の上に固定し、発泡成形体の表面に打抜き刃(火造り型、90°L字状)を置き、室温下にて打抜いた後の打抜き面を目視及び打抜き側の断面の変形量をノギスで計測して評価した。
A:表面のひび割れや、断面の厚さの変化がほとんどない。
B:表面にひび割れはないが、断面の厚さが2mm以上、3mm未満に圧縮されている。
C:表面にひび割れはないが、断面の厚さが2mm未満に圧縮されている。
D:表面にひび割れが生じる。
得られた樹脂発泡体を、耐光試験機((株)東洋精機製作所製ユーブコン)を用いて、試験片温度60℃、放射照度2.5mW/cm2で40時間照射を行った。照射前後の色相変化をJIS L0804変退色用グレースケールにて評価した。
A:ごく僅かな色相変化 (グレースケール4級以上)
B:軽微な色相変化 (グレースケール3~4級)
C:許容できる色相変化 (グレースケール3級)
D:許容できない色相変化(グレースケール2級以下)
電子比重計(アルファーミラージュ(株)製 MD-200S)を用いて樹脂発泡体の比重を測定した。
Claims (8)
- ゴム状重合体と芳香族ビニル系単量体及びシアン化ビニル系単量体、必要に応じてこれらの単量体と共重合可能な他の単量体を塊状重合して得られ、かつ含有するゴム状重合体の重量平均粒子径が0.7~3μmであるゴム強化スチレン系樹脂(A)10~99重量%と、芳香族ビニル系単量体及びシアン化ビニル系単量体、必要に応じてこれらの単量体と共重合可能な他の単量体を共重合して得られる共重合体(B)1~90重量%(ゴム強化スチレン系樹脂(A)と共重合体(B)の合計は100重量%)を含むことを特徴とする、樹脂発泡体の厚みに対するスキン層厚みの割合が0.3~20%であり、かつ比重が0.3~0.7である樹脂発泡体用のゴム強化スチレン系樹脂組成物。
- ゴム状重合体の含有量が3~15重量%であることを特徴とする請求項1に記載のゴム強化スチレン系樹脂組成物。
- 共重合体(B)の220℃、10kgで測定したダイスウェル比が1.3~4.0であることを特徴とする請求項1又は2のいずれかに記載のゴム強化スチレン系樹脂組成物。
- 180℃の溶融混練トルクが10~30N・mであることを特徴とする請求項1~3のいずれかに記載のゴム強化スチレン系樹脂組成物。
- 請求項1~4のいずれかに記載のゴム強化スチレン系樹脂組成物から得られた、樹脂発泡体の厚みに対するスキン層厚みの割合が0.3~20%であり、かつ比重が0.3~0.7である樹脂発泡体。
- ブラインド用樹脂発泡体用であることを特徴とする請求項1~4のいずれかに記載のゴム強化スチレン系樹脂組成物。
- ブラインド用であることを特徴とする請求項5に記載の樹脂発泡体。
- セルカプロセスにより得られることを特徴とする請求項5又は7に記載の樹脂発泡体。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/372,713 US20140378568A1 (en) | 2012-01-17 | 2013-01-11 | Rubber-reinforced styrene resin composition for resin foams, and resin foam |
| JP2013554282A JP5639288B2 (ja) | 2012-01-17 | 2013-01-11 | 樹脂発泡体用のゴム強化スチレン系樹脂組成物及び樹脂発泡体 |
| CN201380004859.3A CN104080846A (zh) | 2012-01-17 | 2013-01-11 | 树脂发泡体用橡胶强化苯乙烯系树脂组成物及树脂发泡体 |
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| JP2012-007540 | 2012-01-17 | ||
| JP2012007540 | 2012-01-17 |
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| US (1) | US20140378568A1 (ja) |
| JP (1) | JP5639288B2 (ja) |
| CN (1) | CN104080846A (ja) |
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- 2013-01-11 WO PCT/JP2013/050436 patent/WO2013108719A1/ja not_active Ceased
- 2013-01-11 JP JP2013554282A patent/JP5639288B2/ja active Active
- 2013-01-11 US US14/372,713 patent/US20140378568A1/en not_active Abandoned
- 2013-01-11 CN CN201380004859.3A patent/CN104080846A/zh active Pending
- 2013-01-14 TW TW102101316A patent/TW201343762A/zh unknown
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| TW201343762A (zh) | 2013-11-01 |
| JPWO2013108719A1 (ja) | 2015-05-11 |
| JP5639288B2 (ja) | 2014-12-10 |
| CN104080846A (zh) | 2014-10-01 |
| US20140378568A1 (en) | 2014-12-25 |
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