WO2016052188A1 - 発泡性熱可塑性樹脂粒子、熱可塑性予備発泡粒子、熱可塑性発泡成形体 - Google Patents
発泡性熱可塑性樹脂粒子、熱可塑性予備発泡粒子、熱可塑性発泡成形体 Download PDFInfo
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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
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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
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
-
- 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
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/224—Surface treatment
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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
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
- C08J9/232—Forming foamed products by sintering expandable particles
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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
- C08L9/02—Copolymers with acrylonitrile
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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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/003—Pigment pastes, e.g. for mixing in paints containing an organic pigment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/42—Nitriles
- C08F220/44—Acrylonitrile
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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
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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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
- C08J2325/08—Copolymers of styrene
- C08J2325/12—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
- 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
- C08J9/12—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 physical blowing agent
- C08J9/14—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 physical blowing agent organic
- C08J9/141—Hydrocarbons
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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
- C08L25/16—Homopolymers or copolymers of alkyl-substituted styrenes
Definitions
- the present invention relates to expandable thermoplastic resin particles having excellent heat resistance.
- expandable polystyrene resin particles are well known. By using the expandable polystyrene resin particles, it is possible to easily obtain an in-mold foam-molded product at low cost.
- the foamed molded product is used for a relatively high temperature because the monomer constituting the polymer is styrene, for example, a heat insulating material for piping, a heat insulating material for roofs, an automobile member, a solar system, etc.
- a heat insulating material for piping for example, a heat insulating material for piping, a heat insulating material for roofs, an automobile member, a solar system, etc.
- a heat insulating material for example, a heat insulating material for piping, a heat insulating material for roofs, an automobile member, a solar system, etc.
- Patent Document 1 proposes a method for defining the ratio of alphamethylstyrene, acrylonitrile and styrene.
- this method since styrene is present in the monomer composition, the heat resistance is insufficient for the quality required in the market.
- Patent Documents 2 to 4 propose a method in which alpha methyl styrene is copolymerized with acrylonitrile, styrene, etc., and the average string length, the easily volatile foaming agent amount, and the plasticizer amount are adjusted in order to improve heat resistance. .
- foaming can be performed up to 40 times, and a foamed molded article having good surface properties can be obtained.
- the heat resistance is insufficient due to the influence of styrene in the monomer composition, and there is room for improvement.
- JP 2001-181433 A JP 2007-191518 A JP 2007-238771 A JP 2007-246666 A
- an object of the present invention is to provide expandable thermoplastic resin particles having improved heat resistance.
- the present inventors have intensively studied to obtain expandable thermoplastic resin particles with improved heat resistance for the purpose of improving the above-mentioned drawbacks of the prior art, and as a result, the present invention has been completed. .
- the first of the present invention is an expandable thermoplastic resin particle in which the monomer composition constituting the polymer consists of 60 to 80 parts by weight of alphamethylstyrene and 40 to 20 parts by weight of acrylonitrile, and remains.
- the second invention is the expandable thermoplastic resin particle according to the first invention, characterized by being used at an expansion ratio of 2 to 15.
- the average chord length of the bubbles on the cut surface of the foamed molded article having a foaming ratio of 10 times obtained from the foamable thermoplastic resin particles is 20 ⁇ m or more and 60 ⁇ m or less. Expandable thermoplastic resin particles according to the invention.
- the dimensional change rate when the foamed molded product obtained from the foamable thermoplastic resin particles is treated at 90 ° C. for 24 hours is less than 0.15%.
- a fifth aspect of the present invention is the foamable thermoplastic resin particle according to any one of the first to fourth aspects, wherein a surface layer of the foamable thermoplastic resin particle is coated with a mixture of a plasticizer and a pigment. .
- a sixth invention is a thermoplastic pre-expanded particle obtained by foaming the expandable thermoplastic resin particle according to any one of the first to fifth inventions at an expansion ratio of 2 to 15 times.
- the seventh invention is a thermoplastic foam molded article obtained by in-mold molding the thermoplastic pre-expanded particles described in the sixth invention.
- the present invention relates to a foamable thermoplastic resin particle comprising 60 to 80 parts by weight of alphamethylstyrene and 40 to 20 parts by weight of acrylonitrile when the monomer composition constituting the polymer is 100 parts by weight.
- the amount of the remaining monomer component is 0.5% by weight or less.
- the present invention is characterized by the absence of a third component that lowers heat resistance such as styrene, and the monomer component constituting the polymer is composed of alphamethylstyrene and acrylonitrile.
- a third component that lowers heat resistance such as styrene
- the monomer component constituting the polymer is composed of alphamethylstyrene and acrylonitrile.
- the amount of alpha methyl styrene used in the present invention is 60 to 80 parts by weight. If the amount used is less than 60 parts by weight, the heat resistance tends to decrease. If it exceeds 80 parts by weight, the polymerization conversion rate is lowered, and a large amount of monomer remains in the resin, so that the heat resistance is deteriorated.
- the amount of alpha methyl styrene is preferably 63 parts by weight or more, and more preferably 65 parts by weight or more. Moreover, 77 weight part or less is preferable and 75 weight part or less is more preferable. By making the ratio of alpha methyl styrene more appropriate, the heat resistance at the time of low-magnification foaming and the fusion property between resin particles can be further improved.
- the amount of acrylonitrile used in the present invention is 20 to 40 parts by weight in order to improve the polymerization conversion rate of the composition. If the amount used is less than 20 parts by weight, the conversion rate of the composition decreases, and a large amount of monomer remains in the resin, so that the heat resistance deteriorates. When it exceeds 40 parts by weight, the polymerization conversion rate does not change, the resin is colored yellowish brown, and the internal fusion tends to deteriorate.
- the amount of acrylonitrile is preferably 37 parts by weight or less, and more preferably 35 parts by weight or less. Moreover, 23 weight part or more is preferable and 25 weight part or more is more preferable.
- the monomer component contained in the expandable thermoplastic resin particles of the present invention is less than 0.5% by weight. Preferably, it is 0.4 weight% or less. If the amount of the remaining monomer component is 0.5% by weight or less, good heat resistance can be obtained.
- the amount of monomer component remaining means the total amount of unreacted material remaining in the monomer composition constituting the expandable thermoplastic resin particles. Even if the monomer component is, for example, 0.1% by weight or more, particularly 0.2% by weight or more, it does not adversely affect the present invention.
- the good heat resistance referred to in the present invention means that the heating dimensional change after 24 hours at 90 ° C. is less than ⁇ 0.15%.
- the expansion ratio of the present invention is preferably 2 to 15 times. A more preferable range is 5 to 10 times. This range of expansion ratio is characterized by a small dimensional change with time and high mechanical strength. Due to this feature, it can be used for applications such as automobile members, heat insulating members / structural members of home appliances, and parts trays for robot lines.
- the average chord length of the cells on the cut surface of the foamed molded product obtained from the foamable thermoplastic resin particles is preferably 15 ⁇ m or more, more preferably 20 ⁇ m or more, and even more preferably 30 ⁇ m or more. It is preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, and still more preferably 50 ⁇ m or less.
- the average chord length is too short, the film thickness of the cells constituting the foam tends to be thin, and the surface properties and heat resistance tend to deteriorate. If the average chord length is too long, heat resistance can be maintained, but surface properties and internal fusion tend to be poor.
- the average chord length of the bubbles on the cut surface of the foam can also be controlled by the amount of bubble regulator (nucleating agent) used. For example, when the amount of the bubble adjusting agent (nucleating agent) is increased, the average string length is decreased, and when the amount of the bubble adjusting agent (nucleating agent) is decreased, the average string length is increased.
- bubble regulator nucleating agent
- Examples of the air conditioner (nucleating agent) used in the present invention include methyl methacrylate copolymer, polyethylene wax, talc, fatty acid bisamide, ethylene-vinyl acetate copolymer resin, and the like.
- Specific examples of the fatty acid bisamide include methylene bisstearyl amide, ethylene bisstearyl amide, hexamethylene bispalmitic acid amide, ethylene bisoleic acid amide and the like.
- fatty acid bisamide is preferable, and ethylene bisstearyl amide is more preferable in terms of easy adjustment of the average string length.
- the cell regulator (nucleating agent) is preferably 0.07 parts by weight or more, more preferably 0.1 parts by weight or more, and 0.3 parts by weight with respect to 100 parts by weight of the monomer constituting the polymer. Part or less, more preferably 0.2 part by weight or less, and still more preferably 0.15 part by weight or less.
- blowing agent used in the present invention examples include aliphatic hydrocarbons having 3 to 5 carbon atoms such as propane, butane and pentane, alicyclic hydrocarbons having 4 to 5 carbon atoms such as cyclobutane and cyclopentane, and methyl.
- Halogenated hydrocarbons such as chloride, dichlorodifluoromethane, dichlorotetrafluoroethane and the like can be mentioned.
- foaming agents may be used alone or in combination of two or more.
- aliphatic hydrocarbons are preferable, and butane is preferable from the viewpoint of good foaming power. More preferably, it is butane having an isobutane ratio of 50% by weight or less. When the isobutane ratio exceeds 50% by weight, the average chord length is less than 20 ⁇ m, the film thickness of the cell constituting the foam is thinned, and the internal fusion, surface property, and heat resistance tend to deteriorate.
- a foaming aid may be used in combination with the foaming agent.
- the foaming aid include a solvent having a boiling point of 200 ° C. or less under atmospheric pressure, and specifically, aromatic organic compounds such as styrene, toluene, ethylbenzene, and xylene, and cyclic compounds such as cyclohexane and methylcyclohexane. Aliphatic hydrocarbons, ethyl acetate, butyl acetate and the like can be mentioned.
- the foaming aid is preferably 1 part by weight or more, more preferably 5 parts by weight or more, still more preferably 10 parts by weight or more, and preferably 40 parts by weight or less, more preferably 30 parts by weight with respect to 100 parts by weight of the foaming agent.
- the amount is not more than parts by weight, more preferably not more than 25 parts by weight.
- the content of the foaming agent in the expandable thermoplastic resin particles in the present invention is preferably less than 4% by weight, and more preferably 3% by weight or less. If it is 4% by weight or more, the molding cycle tends to be long.
- the content of the blowing agent may be, for example, 1% by weight or more, particularly 2% by weight or more.
- the weight average molecular weight Mw of the expandable thermoplastic resin particles in the present invention is preferably 80,000 or more and less than 120,000.
- the weight average molecular weight Mw of the expandable styrene resin particles is less than 80,000, the surface property and the heat resistance tend to be deteriorated.
- the weight average molecular weight Mw is 120,000 or more, the high heat resistance can be maintained, but the foamability becomes low. There is a tendency to deteriorate.
- the weight average molecular weight Mw can be controlled by a combination of the amount of initiator used for polymerizing the thermoplastic resin particles and the polymerization temperature. For example, Mw can be lowered by increasing the amount of initiator used and / or increasing the polymerization temperature.
- the weight average molecular weight Mw of the expandable thermoplastic resin particles in the present invention is a value measured under the conditions described later using a gel permeation chromatograph (hereinafter sometimes abbreviated as “GPC”). It is.
- GPC gel permeation chromatograph
- Examples of the method for producing the foamable thermoplastic resin particles of the present invention include a method of impregnating particles obtained by suspension polymerization in an aqueous medium with a foaming agent, and pellets produced by bulk polymerization in an aqueous medium. It can be obtained by any method of impregnating a foaming agent.
- true spherical resin particles can be obtained, and furthermore, the suspension weight with good industrial productivity can be obtained from the point that the polymerization step and the blowing agent impregnation step can be performed consistently to obtain the foamable thermoplastic resin particles.
- suspending agent used in the suspension polymerization method in the present invention examples include water-soluble polymers such as polyvinyl alcohol, methyl cellulose, polyacrylamide, and polyvinyl pyrrolidone, and poorly soluble inorganic substances such as tricalcium phosphate and magnesium pyrophosphate, Etc.
- water-soluble polymers such as polyvinyl alcohol, methyl cellulose, polyacrylamide, and polyvinyl pyrrolidone
- poorly soluble inorganic substances such as tricalcium phosphate and magnesium pyrophosphate, Etc.
- an anionic surfactant such as sodium dodecylbenzenesulfonate or sodium ⁇ -olefinsulfonate.
- the combined use of a water-soluble polymer and a hardly soluble inorganic substance is also effective.
- a radical generating polymerization initiator generally used for producing a thermoplastic polymer can be used.
- Typical polymerization initiators include, for example, azo compounds such as azobisisobutyronitrile, benzoyl peroxide, t-butylperoxy-2-ethylhexanoate, lauroyl peroxide-t-butyl.
- Peroxyisopropyl carbonate 1,1-bis (t-butylperoxy) cyclohexane, 1,1-bis (t-amylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butyl) Peroxy) -3,3,5-trimethylcyclohexane, t-butylperoxybenzoate, t-butylperoxy-2-ethylhexyl carbonate, di-t-butylperoxyhexahydroterephthalate It is done.
- These polymerization initiators may be used alone or in combination of two or more.
- the amount of the polymerization initiator used in the suspension polymerization method of the present invention is preferably 0.01 parts by weight or more and less than 3 parts by weight with respect to 100 parts by weight of the total monomer weight. If the amount of the polymerization initiator used is less than 0.01 parts by weight, the polymerization rate tends to be slow, whereas if it exceeds 3 parts by weight, the polymerization reaction tends to be fast and difficult to control.
- additives that can be added during suspension polymerization of the present invention external additives, flame retardants, flame retardant aids, and the like may be used as long as the effects of the present invention are not impaired.
- the flame retardant and flame retardant aid used in the present invention known and conventional ones can be used.
- the flame retardant include, for example, halogenated aliphatic hydrocarbon compounds such as hexabromocyclododecane, tetrabromobutane, hexabromocyclohexane, tetrabromobisphenol A, tetrabromobisphenol F, 2,4,6-tri Brominated phenols such as bromophenol, tetrabromobisphenol A-bis (2,3-dibromopropyl ether), tetrabromobisphenol A-bis (2,3-dibromo-2-methylpropyl ether), tetrabromobisphenol A- Brominated phenol derivatives such as diglycidyl ether, 2,2-bis [4 ′ (2 ′′, 3 ′′ -dibromoalkoxy) -3 ′, 5′-dibromophenyl
- the flame retardant aid may include initiators such as cumene hydroperoxide, dicumyl peroxide, t-butyl hydroperoxide, and 2,3-dimethyl-2,3-diphenylbutane. .
- the pigment used in the present invention examples include phthalocyanine (phthalocyanine blue, phthalocyanine green, etc.), azo, condensed azo, anthraquinone, perinone / perylene, indigo / thioindico, isoindoline non, azomethine azo Organic pigments such as dioxazine, quinacridone, aniline black, and triphenylmethane.
- the pigment is preferably 0.001 part by weight or more, more preferably 0.003 part by weight or more, and 0.1 part by weight with respect to 100 parts by weight of the monomer constituting the polymer. The following is preferable, and 0.07 parts by weight or less is more preferable.
- plasticizer examples include phthalic acid ester compounds such as bis (2-ethylhexyl) phthalate and butylbenzyl phthalate, diethylene glycol dibenzoate, and dipropylene glycol dibenzoate. Is mentioned. In recent years, the use of diethylene glycol dibenzoate and dipropylene glycol dibenzoate (including mixtures thereof) is preferred because of its environmental impact.
- the plasticizer is preferably 0.001 part by weight or more, more preferably 0.005 part by weight or more, preferably 0.1 part by weight or less, based on 100 parts by weight of the monomer constituting the polymer. .05 parts by weight or less is more preferable. Further, the plasticizer is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, preferably 5 parts by weight or less, more preferably 3 parts by weight or less with respect to 1 part by weight of the pigment. is there.
- the surface layer of the expandable thermoplastic resin particles of the present invention is preferably coated with a mixture of a plasticizer and a pigment.
- the method of coating the surface of the expandable thermoplastic resin particles with the pigment and the plasticizer is preferably a method of blending the expandable thermoplastic resin particles, the pigment and the plasticizer in a mixing apparatus.
- Examples of the mixing device used in the present invention include a super mixer, a nauter mixer, a universal mixer, a Henschel mixer, and a Ladige mixer.
- a super mixer is preferable in that it has good stirring and mixing properties and can efficiently blend pigments and plasticizers.
- external additives and attachments other than pigments and plasticizers include fatty acid triglycerides such as lauric acid triglyceride, stearic acid triglyceride, linoleic acid triglyceride, lauric acid diglyceride, stearic acid diglyceride, and linoleic acid diglyceride.
- fatty acid triglycerides such as lauric acid triglyceride, stearic acid triglyceride, linoleic acid triglyceride, lauric acid diglyceride, stearic acid diglyceride, and linoleic acid diglyceride.
- Fatty acid monoglycerides such as diglyceride, lauric acid monoglyceride, stearic acid monoglyceride, linoleic acid monoglyceride, fatty acid metal salts such as zinc stearate, calcium stearate, magnesium stearate, aluminum stearate, zinc laurate, calcium laurate, polyoxyethylene cetyl ether , Polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxy Chirenraureto, polyoxyethylene palmitate, polyoxyethylene stearate, etc. and nonionic surfactants such as polyoxyethylene oleate and the like.
- These external additives and attachments may be used alone or in combination of two or more.
- a preferable coating method is a method of attaching by drying and coating by mixing and stirring.
- the foamable thermoplastic resin particles of the present invention are prefoamed at a foaming ratio of 2 to 15 times to obtain thermoplastic prefoamed particles. Thereafter, it is heated and foamed to obtain a foamed molded product.
- pre-foaming method for example, an ordinary method such as foaming by heating with steam or the like using a cylindrical pre-foaming apparatus can be employed.
- a conventional method such as a so-called in-mold foam-molding method, in which pre-foamed particles are filled in a mold, and a foam-molded product is obtained by blowing and heating steam or the like.
- the method can be adopted.
- the monomer component in the obtained expandable thermoplastic resin particles was prepared by dissolving 1.0 g of expandable thermoplastic resin particles in 20 ml of dichloromethane and adding 0.005 g of an internal standard solution (cyclopentanol). It measured on the following conditions using chromatography (GC).
- GC Shimadzu Corporation GC-14B
- Gel foam permeation chromatograph is obtained by dissolving 0.02 g of expandable thermoplastic resin particles in 20 ml of tetrahydrofuran (hereinafter sometimes abbreviated as “THF”) with respect to the obtained expandable thermoplastic resin particles.
- THF tetrahydrofuran
- GPC GPC measurement was performed under the following conditions to obtain a GPC measurement chart, a weight average molecular weight (Mw), and a number average molecular weight (Mn).
- Mw weight average molecular weight
- Mn number average molecular weight
- Measuring device Tosoh Corporation, high-speed GPC device HLC-8220 Column used: Tosoh Corporation, SuperHZM-H x 2, SuperH-RC x 2 Column temperature: 40 ° C., mobile phase: THF (tetrahydrofuran) Flow rate: 0.35 ml / min, injection volume: 10 ⁇ L Detector: RI.
- thermoplastic resin particles were put into a pre-foaming machine equipped with a stirrer, and foamed by heating with steam to obtain pre-foamed particles with an apparent magnification of 10 times.
- thermoplastic resin foam is broken, the fractured surface is observed, the ratio of the broken particles rather than the particle interface is obtained, and the fusion is performed according to the following criteria. Sex was judged.
- thermoplastic resin foam was visually observed, and the surface property was evaluated according to the following criteria.
- Example 1 ⁇ Production of expandable thermoplastic resin particles> In a 6 L autoclave attached to a stirrer, 108 parts by weight of pure water, 0.08 part by weight of tribasic calcium phosphate, 0.006 part by weight of sodium ⁇ -olefin sulfonate, and di-t-butylperoxyhexahydro as an initiator 0.773 parts by weight of terephthalate, 0.16 parts by weight of 1,1-bis (t-butylperoxy) cyclohexane, and 0.12 parts by weight of ethylene bisstearyl amide as a nucleating agent were charged.
- thermoplastic resin pre-expanded particles are filled into a plate-shaped mold having a thickness of 20 mm and a length of 450 mm ⁇ width of 300 mm using a molding machine [manufactured by Daisen, KR-57]. In-mold molding was performed at 8 kgf / cm 2 to obtain a foam molded article.
- Example 2 Manufacture of expandable thermoplastic resin particles> The same as in Example 1 except that the monomer composition at the start of polymerization was changed to 78 parts by weight of alphamethylstyrene monomer and 22 parts by weight of acrylonitrile monomer. By the operation, expandable thermoplastic resin particles, pre-expanded particles, and in-mold expanded molded articles were obtained. The evaluation results are shown in Table 1.
- Example 3 Manufacture of expandable thermoplastic resin particles> The same as in Example 1 except that the monomer composition at the start of polymerization was changed to 62 parts by weight of alphamethylstyrene monomer and 38 parts by weight of acrylonitrile monomer. By the operation, expandable thermoplastic resin particles, pre-expanded particles, and in-mold expanded molded articles were obtained. The evaluation results are shown in Table 1.
- Example 4 In ⁇ Manufacture of expandable thermoplastic resin particles>, the expandable thermoplastic resin particles, pre-expanded particles, and in-mold foam molding were performed in the same manner as in Example 1 except that the holding time at 114 ° C. was changed to 2 hours. Got the body. The evaluation results are shown in Table 1.
- Example 5 In ⁇ Manufacture of expandable thermoplastic resin particles>, expandable thermoplastic resin particles, pre-expanded particles, in-mold foaming were carried out in the same manner as in Example 1 except that ethylene bisstearyl amide was changed to 0.20 parts by weight. A molded body was obtained. The evaluation results are shown in Table 1.
- Example 6 In ⁇ Manufacture of expandable thermoplastic resin particles>, expandable thermoplastic resin particles, pre-expanded particles, in-mold foaming were performed in the same manner as in Example 1 except that the amount was changed to 0.08 parts by weight of ethylene bisstearyl amide. A molded body was obtained. The evaluation results are shown in Table 1.
- Example 7 In ⁇ Manufacture of Expandable Thermoplastic Resin Particles>, after obtaining expandable thermoplastic resin particles by the method described in Example 1, the above-mentioned expandable thermoplastic resin particles were added to a super mixer [manufactured by Kawata, SMV-20]. A mixture of plasticizer: butyl benzyl phthalate: 0.01 parts by weight and pigment: furothocyanin blue: 0.005 parts by weight was added and blended for 60 seconds to obtain expandable thermoplastic resin particles. Thereafter, pre-expanded particles and an in-mold expanded molded article were obtained by the same operation as in Example 1. The evaluation results are shown in Table 1.
- Example 8 In ⁇ Manufacture of Expandable Thermoplastic Resin Particles>, after obtaining expandable thermoplastic resin particles by the method described in Example 1, the above-mentioned expandable thermoplastic resin particles were added to a super mixer [manufactured by Kawata, SMV-20].
- Plasticizer Mixture of 50 to 60% by weight of diethylene glycol dibenzoate and 40 to 50% by weight of dipropylene glycol dibenzoate (product name JP120: Jay Plus Co.): 0.01 part by weight and pigment: furotacyanine blue: 0.005
- the mixture by weight was added and blended for 60 seconds to obtain expandable thermoplastic resin particles. Thereafter, pre-expanded particles and an in-mold expanded molded article were obtained by the same operation as in Example 1. The evaluation results are shown in Table 1.
- Example 9 In ⁇ Manufacture of Expandable Thermoplastic Resin Particles>, after obtaining expandable thermoplastic resin particles by the method described in Example 1, the above-mentioned expandable thermoplastic resin particles were added to a super mixer [manufactured by Kawata, SMV-20].
- Plasticizer Mixture of 50 to 60% by weight of diethylene glycol dibenzoate and 40 to 50% by weight of dipropylene glycol dibenzoate (product name JP120: Jay Plus Co.): 0.01 parts by weight and pigment: furothocyanin blue: 0.05 The mixture by weight was added and blended for 60 seconds to obtain expandable thermoplastic resin particles. Thereafter, pre-expanded particles and an in-mold expanded molded article were obtained by the same operation as in Example 1. The evaluation results are shown in Table 1.
- Example 10 In ⁇ Manufacture of Expandable Thermoplastic Resin Particles>, after obtaining expandable thermoplastic resin particles by the method described in Example 1, the above-mentioned expandable thermoplastic resin particles were added to a super mixer [manufactured by Kawata, SMV-20].
- Plasticizer Mixture of 50 to 60% by weight of diethylene glycol dibenzoate and 40 to 50% by weight of dipropylene glycol dibenzoate (product name JP120: Jay Plus Co.): 0.01 parts by weight and pigment: furacocyanin green: 0.05 The mixture by weight was added and blended for 60 seconds to obtain expandable thermoplastic resin particles. Thereafter, pre-expanded particles and an in-mold expanded molded article were obtained by the same operation as in Example 1. The evaluation results are shown in Table 1.
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Abstract
Description
気泡調整剤(造核剤)は、重合体を構成する単量体100重量部に対して、0.07重量部以上が好ましく、より好ましくは0.1重量部以上であり、0.3重量部以下が好ましく、より好ましくは0.2重量部以下、さらに好ましくは0.15重量部以下である。
発泡助剤は、発泡剤100重量部に対して、1重量部以上が好ましく、より好ましくは5重量部以上、さらに好ましくは10重量部以上であり、40重量部以下が好ましく、より好ましくは30重量部以下、さらに好ましくは25重量部以下である。
すなわち、発泡性熱可塑性樹脂粒子の製造方法としては、スチレン系単量体およびアクリル酸エステル系単量体を懸濁剤、重合開始剤および、必要に応じて、その他の添加剤の存在下で重合反応を開始し、懸濁重合中に発泡剤を添加する、または、重合後に発泡剤を含浸させる方法が好ましい。
顔料を使用する場合、顔料は、重合体を構成する単量体100重量部に対して、0.001重量部以上が好ましく、より好ましくは0.003重量部以上であり、0.1重量部以下が好ましく、0.07重量部以下がより好ましい。
可塑剤は、重合体を構成する単量体100重量部に対して、0.001重量部以上が好ましく、より好ましくは0.005重量部以上であり、0.1重量部以下が好ましく、0.05重量部以下がより好ましい。
また、可塑剤は、顔料1重量部に対して、0.01重量部以上が好ましく、より好ましくは0.1重量部以上であり、5重量部以下が好ましく、より好ましくは3重量部以下である。
なお、測定評価法は、以下の通りに実施した。
得られた発泡性熱可塑性樹脂粒子中の単量体成分は、発泡性熱可塑性樹脂粒子1.0gをジクロロメタン20mlに溶解し、内部標準液(シクロペンタノール)0.005gを加えた後、ガスクロマトグラフィー(GC)を用いて、以下の条件にて測定した。
GC:島津製作所社製 GC-14B
カラム:PEG-20M 25%
Chromosorb W 60/80(3.0m×3.0mmI.D.)
カラム温度:110℃
検出器(FID)温度:170℃。
得られた発泡性熱可塑性樹脂粒子に対して、発泡性熱可塑性樹脂粒子0.02gをテトラヒドロフラン(以下、「THF」と略す場合がある)20mlに溶解させた後、ゲルパーミェーションクロマトグラフ(GPC)を用いて、以下の条件にてGPC測定を行い、GPC測定チャートおよび、重量平均分子量(Mw)および数平均分子量(Mn)を得た。尚、得られた値はポリスチレン換算の相対値である。
測定装置:東ソー社製、高速GPC装置 HLC-8220
使用カラム:東ソー社製、SuperHZM-H×2本、SuperH-RC×2本
カラム温度:40℃、移動相:THF(テトラヒドロフラン)
流量:0.35ml/分、注入量:10μL
検出器:RI。
攪拌機付き予備発泡機に発泡性熱可塑性樹脂粒子を投入し、水蒸気で加熱することにより発泡させ、見掛け倍率10倍の予備発泡粒子を得た。
成形機[ダイセン製、KR-57]を用いて、厚み20mmで縦450mm×横300mmサイズの板状の金型内に充填し、吹き込み蒸気圧力0.8kgf/cm2として型内成形をして、発泡成形体を得た。成形体の表面状態を目視にて観察、評価するとともに以下の評価を実施した。
得られた熱可塑性樹脂発泡体を破断し、破断面を観察して、粒子界面ではなく、粒子が破断している割合を求めて、以下の基準にて、融着性を判定した。
◎:粒子破断の割合が90%以上。
○:粒子破断の割合が80%以上、90%未満。
△:粒子破断の割合が70%以上、80%未満。
×:粒子破断の割合が70%未満。
得られた熱可塑性樹脂発泡体の表面状態を目視観察し、以下の基準にて表面性を評価した。
◎:表面の溶融、粒間が無く、非常に美麗。
○:表面の溶融、粒間が少なく、美麗。
△:表面の溶融、粒間があり、外観やや不良。
×:表面の溶融、粒間が多く、外観不良。
発泡成形体の平均セル径は、発泡成形体の切断面をマイクロスコープで観察し、切断面の一直線上(60mm)にかかる気泡数から平均弦長を測定し、平均セル径とした。
平均弦長t=線長/(気泡数×写真の倍率)。
発泡成形体を150×150×20(t)mmに切り出したサンプル片を、JIS K6767(高温時の寸法安定性:B法)に準拠し、90℃で24時間後の加熱寸法変化率を測定した。
◎:加熱寸法変化率が0.10%未満。
○:加熱寸法変化率が0.10%以上、0.15%未満。
△:加熱寸法変化率が0.15%以上、0.20%未満。
×:加熱寸法変化率が0.2%未満。
撹拌機付属の6Lのオートクレーブに、純水108重量部、第3リン酸カルシウム0.08重量部、α-オレフィンスルフォン酸ソーダ0.006重量部および、開始剤として、ジ-t-ブチルパーオキシヘキサハイドロテレフタレート0.773重量部および1,1-ビス(t-ブチルパーオキシ)シクロヘキサン0.16重量部及び、造核剤としてエチレンビスステアリルアマイド0.12重量部を仕込んだ。続いて、250回転/分で撹拌しながら、アルファメチルスチレン単量体70重量部、アクリロニトリル単量体30重量部を仕込んだ後、98℃まで昇温させた。引き続き、98℃にて9時間保持して、熱可塑性樹脂粒子を得た。その後、114℃に昇温し、114℃にて3時間保持した。
得られた発泡性熱可塑性樹脂粒子を篩分けして、粒子径0.6mm~1.4mmの発泡性熱可塑性樹脂粒子を分取した。
得られた熱可塑性樹脂予備発泡粒子を、成形機[ダイセン製、KR-57]を用いて、厚み20mmで縦450mm×横300mmサイズの板状の金型内に充填し、吹き込み蒸気圧力0.8kgf/cm2として型内成形をして、発泡成形体を得た。
<発泡性熱可塑性樹脂粒子の製造>において、重合開始時の単量体組成をアルファメチルスチレン単量体78重量部およびアクリロニトリル単量体22重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、重合開始時の単量体組成をアルファメチルスチレン単量体62重量部およびアクリロニトリル単量体38重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、114℃の保持時間を2時間に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、エチレンビスステアリルアマイド0.20重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、エチレンビスステアリルアマイド0.08重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、実施例1に記載の方法で発泡性熱可塑性樹脂粒子を得た後、スーパーミキサー[カワタ製、SMV-20]に前記発泡性熱可塑性樹脂粒子に可塑剤:フタル酸ブチルベンジル:0.01重量部と顔料:フロタシアニンブルー:0.005重量の混合物を投入し、60秒間ブレンドすることにより発泡性熱可塑性樹脂粒子を得た。その後、実施例1と同様の操作により予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、実施例1に記載の方法で発泡性熱可塑性樹脂粒子を得た後、スーパーミキサー[カワタ製、SMV-20]に前記発泡性熱可塑性樹脂粒子に可塑剤:ジエチレングリコールジベンゾエート50~60重量%とジプロピレングリコールジベンゾエート40~50重量%の混合物(製品名JP120:ジェイ・プラス社):0.01重量部と顔料:フロタシアニンブルー:0.005重量の混合物を投入し、60秒間ブレンドすることにより発泡性熱可塑性樹脂粒子を得た。その後、実施例1と同様の操作により予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、実施例1に記載の方法で発泡性熱可塑性樹脂粒子を得た後、スーパーミキサー[カワタ製、SMV-20]に前記発泡性熱可塑性樹脂粒子に可塑剤:ジエチレングリコールジベンゾエート50~60重量%とジプロピレングリコールジベンゾエート40~50重量%の混合物(製品名JP120:ジェイ・プラス社):0.01重量部と顔料:フロタシアニンブルー:0.05重量の混合物を投入し、60秒間ブレンドすることにより発泡性熱可塑性樹脂粒子を得た。その後、実施例1と同様の操作により予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、実施例1に記載の方法で発泡性熱可塑性樹脂粒子を得た後、スーパーミキサー[カワタ製、SMV-20]に前記発泡性熱可塑性樹脂粒子に可塑剤:ジエチレングリコールジベンゾエート50~60重量%とジプロピレングリコールジベンゾエート40~50重量%の混合物(製品名JP120:ジェイ・プラス社):0.01重量部と顔料:フロタシアニングリーン:0.05重量の混合物を投入し、60秒間ブレンドすることにより発泡性熱可塑性樹脂粒子を得た。その後、実施例1と同様の操作により予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、重合開始時の単量体組成をアルファメチルスチレン単量体85重量部およびアクリロニトリル単量体15重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、重合開始時の単量体組成をアルファメチルスチレン単量体55重量部およびアクリロニトリル単量体45重量部に変更した以外は、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
<発泡性熱可塑性樹脂粒子の製造>において、特開2007-246566公報の実施例1に記載の方法で発泡性熱可塑性樹脂粒子を得た。その後、実施例1と同様の操作により、発泡性熱可塑性樹脂粒子、予備発泡粒子、型内発泡成形体を得た。評価結果を、表1に示す。
Claims (7)
- 重合体を構成する単量体組成がアルファメチルスチレン60~80重量部と、アクリロニトリル40~20重量部とからなる発泡性熱可塑性樹脂粒子であって、残存する単量体成分量が0.5重量%以下であることを特徴とする発泡性熱可塑性樹脂粒子。
- 発泡倍率2~15倍で使用することを特徴とする請求項1記載の発泡性熱可塑性樹脂粒子。
- 前記発泡性熱可塑性樹脂粒子から得られる発泡倍率10倍の発泡成形体の切断面の気泡の平均弦長が20μm以上60μm以下であることを特徴とする請求項1または2記載の発泡性熱可塑性樹脂粒子。
- 前記発泡性熱可塑性樹脂粒子から得られる発泡成形体を24時間、90℃で処理した時の寸法変化率が0.15%未満となることを特徴とする請求項1~3のいずれかに記載の発泡性熱可塑性樹脂粒子。
- 前記発泡性熱可塑性樹脂粒子の表層に可塑剤と顔料の混合物がコーティングされていることを特徴とする請求項1~4のいずれかに記載の発泡性熱可塑性樹脂粒子。
- 請求項1~5のいずれかに記載の発泡性熱可塑性樹脂粒子を発泡倍率2~15倍で発泡したことを特徴とする熱可塑性予備発泡粒子。
- 請求項6に記載の熱可塑性予備発泡粒子を型内成形させることにより得られる熱可塑性発泡成形体。
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JP2020007417A (ja) * | 2018-07-04 | 2020-01-16 | 株式会社ジェイエスピー | 発泡性複合樹脂粒子 |
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2015
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Cited By (3)
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JP2016138190A (ja) * | 2015-01-28 | 2016-08-04 | 株式会社カネカ | 着色ポリスチレン系発泡性樹脂粒子、予備発泡粒子及び、成形体 |
JP2020007417A (ja) * | 2018-07-04 | 2020-01-16 | 株式会社ジェイエスピー | 発泡性複合樹脂粒子 |
JP7078849B2 (ja) | 2018-07-04 | 2022-06-01 | 株式会社ジェイエスピー | 発泡性複合樹脂粒子 |
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EP3202836A1 (en) | 2017-08-09 |
CN107075164B (zh) | 2020-09-04 |
US10563056B2 (en) | 2020-02-18 |
JP6612764B2 (ja) | 2019-11-27 |
JP2020094186A (ja) | 2020-06-18 |
JPWO2016052188A1 (ja) | 2017-07-13 |
JP6871991B2 (ja) | 2021-05-19 |
EP3202836A4 (en) | 2018-05-09 |
EP3202836B1 (en) | 2020-01-01 |
CN107075164A (zh) | 2017-08-18 |
US20170298215A1 (en) | 2017-10-19 |
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