JP2007169384A - Low-thermal storage resin composition exhibiting woodgrain pattern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition affording a molded product having low-thermal storage properties and a woodgrain pattern with excellent weather resistance, woodgrain coloring properties, heat resistance, etc. <P>SOLUTION: The low-thermal storage resin composition comprises 100 pts.mass of pellets of a composition (I) composed of a rubber-reinforced vinylic resin, an inorganic pigment having infrared light reflection characteristics and a lubricant and 0.1-30 pts.mass of pellets of a composition (II) composed of a thermoplastic resin, a dye or a pigment and a lubricant. The amounts of the inorganic pigment and the lubricant are 0.5-13 mass% and 1-12 mass% based on the whole composition, respectively. The temperature rise obtained under the test conditions is ≤73°C. [test conditions] A molded product (80 mm length, 55 mm width and 2.5 mm thickness) composed of the low-thermal storage resin composition is conditioned in a room regulated to 25±2°C temperature and 50±5% RH humidity for 60 min and the surface is then irradiated with an infrared lamp (100 W output) from 200 mm height for 60 min. The surface temperature of the molded product is subsequently measured and the difference from the initial temperature before the irradiation with the infrared lamp is taken as the temperature rise. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a low heat storage resin composition that expresses a woodgrain pattern, and more particularly, to a thermoplastic resin composition that exhibits a vivid woodgrain pattern with reduced heat storage, excellent weather resistance and heat resistance.

Conventionally, as a thermoplastic resin composition that expresses a wood grain pattern at the time of molding, a composition mainly composed of polyvinyl chloride resin (PVC) is known and used as a molded product such as a window frame (patent) Reference 1 and 2).
However, since the polyvinyl chloride resin has insufficient heat resistance, the temperature of the resin window frame rises due to the irradiation of sunlight, causing dimensional changes such as deformation and shrinkage. There was a fault that heat retention, opening and closing function, etc. were impaired. In addition, when a colorant is blended in the polyvinyl chloride resin, when the colorant is one that generates heat by irradiation with sunlight, such as a dark pigment, the temperature rise of the molded product is further promoted, Coloring options were limited.

On the other hand, for styrene-based resins, a composition that expresses a wood grain pattern at the time of molding has been proposed (see Reference 3), and a composition that has little heat storage during sunlight irradiation has also been proposed (patent) References 4 and 5).
However, in any of the resins, no attempt has been made to reduce the heat storage of a resin composition that expresses a grain-like pattern, and such a resin composition is used in a portion exposed to sunlight irradiation. Therefore, further improvement of weather resistance and heat resistance and further sharpening of the woodgrain pattern are desired.

Japanese Patent Laid-Open No. 2002-3675 JP 2002-194160 A JP-A-11-310683 Japanese Patent Laid-Open No. 2004-124042 JP 2004-250553 A

An object of the present invention is a thermoplastic resin composition that gives a molded product that is suppressed in temperature rise even when irradiated with sunlight and that has a grain-like appearance, and has weather resistance, grain colorability, heat resistance (dimensions) It is to provide a composition having excellent stability.

As a result of intensive studies to achieve the above-mentioned object, the present inventors dry blended thermoplastic resin pellets containing a rubber-reinforced vinyl resin and thermoplastic resin pellets containing a pigment. In a thermoplastic resin composition that expresses a woodgrain pattern, by containing an inorganic pigment having infrared reflection characteristics as a pigment in at least one of both pellets, heat storage is low, weather resistance, wood coloring, heat resistance (dimensions) The inventors have found that a low heat storage resin composition excellent in (stability) and the like can be obtained, and have completed the present invention.

That is, according to the present invention, it is a composition obtained by dry blending 100 parts by mass of pellets comprising the following composition (I) and 0.1 to 30 parts by mass of pellets comprising the following composition (II). The amounts of the inorganic pigment (B) and the lubricant (C) having infrared reflection characteristics contained in the composition are 0.5 to 13% by mass and 1 to 12% by mass, respectively, with respect to the entire composition. Furthermore, there is provided a low heat storage resin composition exhibiting a woodgrain pattern, characterized in that the temperature rise obtained under the following test conditions of the composition is 73 ° C. or less.
Composition (I): 75-99% by mass of rubber-reinforced vinyl resin (A), 0-13% by mass of inorganic pigment (B) having infrared reflection characteristics, and 0-12% by mass of lubricant (C) are melt-kneaded. A thermoplastic resin composition (however, the total of the above components (A), (B) and (C) is 100% by mass).
Composition (II): 18-99% by mass of thermoplastic resin (A ′), 1-70% by mass of dye and / or pigment (B ′), and 0-12% by mass of lubricant (C) are melt-kneaded. A thermoplastic resin composition (provided that the total of the components (A ′), (B ′) and (C) is 100% by mass).
〔Test conditions〕
A molded article (length 80 mm, width 55 mm, thickness 2.5 mm) made of the low heat storage resin composition was conditioned for 60 minutes in a room adjusted to a temperature of 25 ± 2 ° C. and a humidity of 50 ± 5% RH. Thereafter, the surface temperature of the molded article after the surface is irradiated with an infrared lamp (output 100 W) for 60 minutes from a height of 200 mm is measured, and the difference from the initial temperature before irradiation with the infrared lamp is defined as a temperature rise.

The pigment (B ′) may be an inorganic pigment (B) having infrared reflection characteristics, a pigment other than the inorganic pigment (B), or a combination of both. Good.
In the present invention, the wood grain pattern is a concept including not only a wood grain pattern but also a marble pattern.

According to the present invention, in the thermoplastic resin composition exhibiting a woodgrain pattern comprising the pellets of the composition (I) and the pellets of the composition (II), at least one of both the compositions (I) and (II) Inorganic pigments having infrared reflection characteristics as pigments are contained in a predetermined quantitative range to suppress temperature rise and a predetermined amount of lubricant is blended, so that not only heat storage is reduced, but also a woodgrain pattern A low heat storage resin composition having excellent colorability, weather resistance and heat resistance can be obtained.

The present invention will be described in detail below. In the present specification, “(co) polymerization” means homopolymerization and copolymerization, “(meth) acryl” means acryl and / or methacryl, and “(meth) acrylate” Means acrylate and / or methacrylate.

The composition of the present invention is a composition obtained by dry blending the pellet made of the composition (I) and the pellet made of the composition (II).
Composition (I)
The composition (I) contains the rubber-reinforced vinyl resin (A) as an essential component, and may contain an inorganic pigment (B) having an infrared reflection characteristic, a lubricant (C), and the like as necessary.

The rubber-reinforced vinyl resin (A) contains a rubbery polymer (a) in order to improve the impact resistance and the like in the vinyl resin.
As the rubber polymer (a), either a diene rubber polymer or a non-diene rubber polymer can be used. In the present specification, the non-diene rubbery polymer may have a double bond in a part of the main chain, and the upper limit of the amount of double bond allowed is unambiguous depending on the type of rubber polymer. However, it can be determined by conducting an experiment for each type as appropriate.
Diene rubber polymers include polybutadiene, styrene / butadiene copolymers, butadiene / acrylonitrile copolymers, styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, and hydrogens thereof. An additive is mentioned.
Non-diene rubbery polymers include ethylene / propylene copolymers, ethylene / propylene / non-conjugated diene copolymers, ethylene / butene-1 copolymers, ethylene / butene-1 / non-conjugated diene copolymers, In addition to ethylene / α-olefin copolymers such as isobutylene / isoprene copolymers, acrylic rubbers, polyurethane rubbers, silicone rubbers, hydrogenated products of the diene rubbery polymers, and the like. The hydrogenated product includes a hydrogenated product of a styrene block and a styrene / butadiene random copolymer in addition to the hydrogenated product of the block copolymer. A preferable hydrogenation rate of the hydrogenated product is 90 mol% or more of the conjugated diene unit portion.
In the present invention, among these, it is preferable to use a non-diene rubber polymer from the viewpoint of weather resistance and wood grain pattern vividness, the hydrogenated product and acrylic rubber are more preferable, acrylic type Rubber is particularly preferred.
The said rubbery polymer (a) can be used individually by 1 type or in combination of 2 or more types. Further, the rubber-reinforced vinyl resin of the present invention can be obtained by using a different rubber polymer, even if it is composed of a rubber-reinforced vinyl resin alone obtained by using one kind of rubber polymer. A combination of two or more rubber-reinforced vinyl resins obtained may be used. In the present invention, when a rubber-reinforced vinyl resin is obtained by emulsion polymerization, a latex-like rubbery polymer is preferable.

When the rubbery polymer (a) is obtained by emulsion polymerization, the gel content is preferably 98% by mass or less, and more preferably 40 to 98% by mass. By setting it as this range, the thermoplastic resin composition which gives the molded article of the woodgrain pattern excellent in impact resistance and surface appearance can be obtained.
The gel content can be determined by the following method.
First, 1 g of a rubbery polymer is put into 100 ml of toluene and allowed to stand at room temperature for 48 hours. Thereafter, the toluene-insoluble matter and the wire mesh filtered through a 100-mesh wire mesh (mass is W ₁ gram) are vacuum-dried at a temperature of 80 ° C. for 6 hours and weighed (mass W is ₂ grams). Substituting W ₁ and W ₂ into the following formula (1) to obtain the gel content.
Gel content = [{W ₂ (g) −W ₁ (g)} / 1 (g)] × 100 (1)

The gel content is set appropriately at the time of production of the rubbery polymer, such as the type and amount of the crosslinkable monomer, the type and amount of the molecular weight regulator, the polymerization time, the polymerization temperature, and the polymerization conversion rate. It is adjusted by doing.

When the latex is used, the weight average particle diameter of the rubber-like polymer (a) in the latex is preferably 500 to 8000, more preferably 1000 to 5000, and particularly preferably 1000 to 4000. If it is less than 500 mm, the impact resistance of the molded product tends to be inferior, and if it exceeds 8000 mm, the surface gloss of the molded product having a woodgrain pattern may be inferior.

As a method for producing the rubber polymer (a), an emulsion polymerization method is usually preferred in consideration of adjustment of the average particle size and the like. In this case, the average particle size is determined based on the type and amount of emulsifier, the initiator. It can be adjusted by appropriately selecting the production conditions such as type / amount, polymerization time, polymerization temperature and stirring conditions. As another method for adjusting the particle size distribution, a method of blending at least two kinds of the rubbery polymers (a) having different particle sizes may be used.

The vinyl monomer component (b) constituting the vinyl resin of the rubber-reinforced vinyl resin (A) is not particularly limited, and is an aromatic vinyl compound, a (meth) acrylic acid ester compound, a vinyl cyanide compound, Examples include maleimide compounds and acid anhydrides. These can be used individually by 1 type or in combination of 2 or more types.

Examples of the aromatic vinyl compound include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, t-butylstyrene, vinyltoluene, methyl-α-methylstyrene, divinylbenzene, brominated styrene and the like. Of these, styrene, α-methylstyrene, and p-methylstyrene are preferred. Moreover, these can be used individually by 1 type or in combination of 2 or more types.

Examples of the (meth) acrylic acid ester compound include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, and butyl acrylate. Of these, methyl methacrylate is preferred. Moreover, these can be used individually by 1 type or in combination of 2 or more types.

Examples of the vinyl cyanide compound include acrylonitrile and methacrylonitrile. Among these, acrylonitrile is preferable. Moreover, these can be used individually by 1 type or in combination of 2 or more types.
Examples of maleimide compounds include maleimide, N-methylmaleimide, N-butylmaleimide, N-phenylmaleimide, N- (2-methylphenyl) maleimide, N- (4-hydroxyphenyl) maleimide, N-cyclohexylmaleimide and the like. Is mentioned. Of these, N-phenylmaleimide is preferred. Moreover, these can be used individually by 1 type or in combination of 2 or more types. In addition, as another method of introducing the maleimide compound, for example, a method of copolymerizing maleic anhydride and then imidizing may be used.

Examples of the acid anhydride include maleic anhydride, itaconic anhydride, citraconic anhydride, and the like. Moreover, these can be used individually by 1 type or in combination of 2 or more types.

The vinyl monomer component (b) preferably contains an aromatic vinyl compound. In that case, the polymerization ratio of the aromatic vinyl compound (b1) and the other vinyl monomer (b2) ( Component (b1) / component (b2)) is preferably 10 to 95/5 to 90 (unit: mass%), more preferably 20 to 85/15 to 80 (unit: mass%) when the total of these is 100% by mass. (Unit: mass%). If the amount of the aromatic vinyl compound (b1) used is too small, the molding processability and the aesthetic appearance of the molded product tend to be inferior. If it is too much, the effect of using the vinyl monomer (b2) is sufficient. There is a tendency not to show. The vinyl monomer (b2) is preferably composed of at least one selected from (meth) acrylic acid ester compounds, vinyl cyanide compounds, maleimide compounds and the like. The vinyl monomer component (b) preferably contains a (meth) acrylic acid ester compound in order to improve the colorability and sharpness of the woodgrain pattern of the composition of the present invention. It is particularly preferred to include methyl acid. The amount of the (meth) acrylic acid ester compound used is preferably 20 to 95 mass%, more preferably 40 to 90 mass%, based on 100 mass% of the entire vinyl monomer component (b).

Moreover, the following monomer compounds can be further used as the vinyl monomer component (b) as long as the object of the present invention is not impaired. Examples thereof include vinyl compounds containing at least one functional group selected from the group of epoxy groups, hydroxyl groups, amino groups, amide groups, carboxylic acid groups, oxazoline groups, and the like. Examples thereof include glycidyl methacrylate, glycidyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, acrylamide, acrylic acid, methacrylic acid, vinyl oxazoline and the like.

The rubber-reinforced vinyl resin (A) is usually composed of the following component (A1), or component (A1) and component (A2).
Component (A1): A rubber-modified vinyl resin obtained by polymerizing the vinyl monomer component (b) in the presence of the rubbery polymer (a).
Component (A2): A (co) polymer obtained by polymerizing the vinyl monomer component (b) in the absence of the rubbery polymer (a).
The component (A1) is usually not grafted to a rubber copolymer and a graft copolymer obtained by grafting (co) polymerizing the vinyl monomer component (b) to the rubber polymer (a). An ungrafted copolymer (substantially the same as component (A2) above).
However, the component (A2) need not be composed of the same component as the ungrafted copolymer, and has the same composition as the vinyl monomer component (b) used for forming the component (A1). It may be a polymer obtained by polymerizing the components, or a polymer obtained by polymerizing components having a composition different from that of the vinyl monomer component (b) used for the formation of the component (A1). May be. Furthermore, the component (A1) and the component (A2) may be a combination of two or more different compositions.

In both the case where the rubber-reinforced vinyl resin (A) is composed of the component (A1) alone and the case where the rubber-reinforced vinyl resin (A1) is composed of the component (A1) and the component (A2), The content of the rubbery polymer (a) is preferably 3 to 40% by mass, more preferably 5 to 35% by mass. If the content of the rubbery polymer (a) is too small, the impact resistance tends to be inferior, and if it is too much, the hardness and rigidity tend to be inferior. The amount of the rubber polymer (a) used in the production of the component (A1) is the mass ratio of the rubber polymer (a) to the vinyl monomer component (b) (rubber polymer (a). / Vinyl monomer component (b), the total of both being 100 mass%), preferably 5-80 / 95-20, more preferably 10-75 / 90-25.

In the presence of the rubbery polymer (a), the component (A1) can be produced from the vinyl monomer component (b), preferably by emulsion polymerization, solution polymerization, or bulk polymerization.
In the case of producing by emulsion polymerization, a polymerization initiator, a chain transfer agent (molecular weight regulator), an emulsifier, water and the like are used.
The rubbery polymer (a) and the vinyl monomer component (b) used for producing the component (A1) are a monomer in the reaction system in the presence of the total amount of the rubbery polymer. The components may be added all at once, or dividedly or continuously. Moreover, the method which combined these may be used. Furthermore, you may superpose | polymerize by adding the whole quantity or one part of a rubber-like polymer in the middle of superposition | polymerization.

As the polymerization initiator, organic hydroperoxides typified by cumene hydroperoxide, diisopropylbenzene hydroperoxide, paramentane hydroperoxide, etc. Redox system by combination with agents, or persulfates such as potassium persulfate, peroxides such as benzoyl peroxide (BPO), lauroyl peroxide, t-butyl peroxylaurate, t-butyl peroxymonocarbonate, etc. These may be used alone or in combination of two or more. Furthermore, the polymerization initiator can be added to the reaction system all at once or continuously. Moreover, the usage-amount of the said polymerization initiator is 0.1-1.5 mass% normally with respect to the said vinylic monomer component (b) whole quantity, Preferably it is 0.2-0.7 mass%. .

Examples of the chain transfer agent include mercaptans such as octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, n-hexyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan, t-tetradecyl mercaptan, terpinolene, α -The dimer of methylstyrene etc. are mentioned, These can be used individually by 1 type or in combination of 2 or more types. The amount of the chain transfer agent used is usually 0.05 to 2.0% by mass with respect to the total amount of the vinyl monomer component (b).

As an emulsifier used in the case of emulsion polymerization, sulfates of higher alcohols, alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate, aliphatic sulfonates such as sodium lauryl sulfate, higher aliphatic carboxylates, phosphates And anionic surfactants such as polyethylene glycol alkyl ester type and alkyl ether type nonionic surfactants. These can be used individually by 1 type or in combination of 2 or more types. The usage-amount of the said emulsifier is 0.3-5.0 mass% normally with respect to the said vinylic monomer component (b) whole quantity.

The latex obtained by emulsion polymerization is usually purified by coagulation with a coagulant to make the polymer component into powder, and then washing and drying. As the coagulant, inorganic salts such as calcium chloride, magnesium sulfate, magnesium chloride, and sodium chloride, inorganic acids such as sulfuric acid and hydrochloric acid, organic acids such as acetic acid and lactic acid, and the like are used.
A known method can be adopted as a production method by solution polymerization or bulk polymerization.

The graft ratio of the component (A1) is preferably 10 to 200%, more preferably 15 to 150%, and particularly preferably 20 to 100%. When the graft ratio of the component (A1) is less than 10%, the appearance of the molded product having a woodgrain pattern obtained using the low heat storage resin composition of the present invention and the impact strength may be reduced. Moreover, when it exceeds 200%, workability is inferior.
The graft rate can be determined by the following method.
Graft ratio (mass%) = {(TS) / S} × 100 (2)
In the above formula (2), T is 1 g of component (A1) in 20 ml of acetone (but acetonitrile if the rubbery polymer (a) uses acrylic rubber), and 2 by a shaker. It is the mass (g) of insoluble matter obtained by centrifuging for 60 minutes in a centrifuge (rotation speed: 23,000 rpm) after shaking for a while to separate the insoluble matter and the soluble matter. (A1) The mass (g) of the rubbery polymer contained in 1 g.

Further, the intrinsic viscosity [η] of the component (A1) soluble in acetone (however, in the case where the rubbery polymer (a) uses acrylic rubber, acetonitrile soluble component) (in methyl ethyl ketone, 30 (Measured at ° C.) is preferably 0.1 to 1.0 dl / g, more preferably 0.2 to 0.9 dl / g, and particularly preferably 0.3 to 0.7 dl / g. By setting it as this range, the composition of this invention is excellent in moldability (fluidity), and the molded product of the woodgrain pattern obtained using this composition is also excellent in impact resistance.
The graft ratio (%) and intrinsic viscosity [η] are the types and amounts of polymerization initiator, chain transfer agent, emulsifier, solvent, etc., when polymerizing the component (A1), and further the polymerization time, polymerization It can be easily controlled by changing the temperature or the like.

The component (A2) can be obtained in the same manner as the component (A1) except that the vinyl monomer component (b) is polymerized in the absence of the rubbery polymer (a). It can be obtained by bulk polymerization, solution polymerization, emulsion polymerization, suspension polymerization and the like. The types and combinations of the preferred vinyl-based monomer component (b) used for the polymerization of the component (A2) are the same as those described for the component (A1).
The intrinsic viscosity [η] (measured in methyl ethyl ketone at 30 ° C.) of the component (A2) is preferably 0.1 to 1.0 dl / g, more preferably 0.15 to 0.9 dl / g. When the intrinsic viscosity [η] is within the above range, the composition of the present invention is excellent in the balance between physical properties of molding processability and impact resistance. The intrinsic viscosity [η] can be controlled in the same manner as the component (A1).
When the rubber-reinforced vinyl resin (A) used in the present invention contains a (meth) acrylic acid ester compound as a copolymerization component, a clear wood grain pattern colorability is obtained, weather resistance, It is preferable because it is excellent in adhesiveness with a polyvinyl chloride resin. As the (meth) acrylic acid ester compound, methyl methacrylate is preferable. The content of the (meth) acrylic acid ester compound is preferably 5 to 60% by mass, more preferably 10 to 50% by mass, and particularly preferably 10 to 40% by mass with respect to the entire low heat storage resin composition of the present invention. %. If the content of the (meth) acrylic acid ester compound is small, there are cases where the effect of improving the colorability of clear woodgrain pattern, weather resistance, adhesiveness with polyvinyl chloride resin and the like are not sufficient. When there is too much content of a (meth) acrylic acid ester compound, impact resistance may be inferior. The rubber-reinforced vinyl resin (A) containing a (meth) acrylic acid ester compound as a copolymerization component is a component (A1) containing a (meth) acrylic acid ester compound as a copolymerization component and (meth) as a copolymerization component. It may contain either one or both of the component (A2) containing an acrylate compound.

The low heat storage resin composition of the present invention is characterized by containing an inorganic pigment (B) having infrared reflection characteristics, and is similar to wood not only for imparting low heat storage characteristics to the composition of the present invention. In order to impart color tone, the inorganic pigment (B) can be blended into the composition (I) as necessary.
The inorganic pigment (B) is not particularly limited as long as it has a property of hardly absorbing infrared rays, and a compound containing at least one element selected from Fe, Cr, Mn, Cu, Co and Ni is preferable. . In particular, oxides and composite oxides of the above elements are preferable. Specifically, FeO, FeO (OH), Fe ₂ O ₃ , CrO, Cr ₂ O ₃ , Cr ₂ O ₃ .2H ₂ O, MnO, Mn ₂ O ₃ , MnO ₂ , CuO, Cu ₂ O, CoO, CoO.Al ₂ O ₃ , Fe (Fe, Cr) ₂ O ₄ , (Co, Fe) (Fe, Cr) ₂ O ₄ , Cu (Cr _{, Mn) 2 O 4, (} Cu, Fe, Mn) (Fe, Cr, Mn) 2 O 4, (Fe, Zn) (Fe, Cr) 2 O 4, (Fe, Zn) Fe 2 O 4, CoAl ₂ O ₄ , Co (Al, Cr) ₂ O ₄ , Cr ₂ O ₃ : Fe ₂ O ₃ , (Ni, Co, Fe) (Fe, Cr) ₂ O _{4 and the} like. Of these, Cr ₂ O ₃ : Fe ₂ O ₃ , (Cu, Fe, Mn) (Fe, Cr, Mn) ₂ O ₄ , Fe (Fe, Cr) ₂ O ₄ , (Co, Fe) (Fe, Cr) ₂ O ₄ , Cu (Cr, Mn) ₂ O ₄ , (Ni, Co, Fe) (Fe, Cr) ₂ O ₄ may be mentioned. Moreover, the oxides and composite oxides exemplified above can be used singly or in combination of two or more, whereby a molded product colored in a desired color can be obtained.
In the above examples, when CoO is used alone, whitening may occur on the surface of the molded product due to the intensity of infrared rays or the like when it is exposed to sunlight, or it may be volatilized by ultraviolet rays. When CoO is used, it is preferably used in combination with other inorganic pigments.
In the low heat storage resin composition of the present invention, when obtaining a dark color layer such as black or deep green, the inorganic pigment (B) contains at least two elements selected from Fe, Cr and Mn. It is preferable to use an oxide. Examples thereof include Fe (Fe, Cr) ₂ O ₄ , (Co, Fe) (Fe, Cr) ₂ O ₄ , Cu (Cr, Mn) ₂ O ₄ , (Cu, Fe, Mn) (Fe, Cr , Mn) ₂ O ₄ , (Fe, Zn) (Fe, Cr) ₂ O ₄ , Cr ₂ O ₃ : Fe ₂ O _{3 and the} like. These can be used individually by 1 type or in combination of 2 or more types.
In addition, in order to obtain a dark color layer such as black or deep green, the total amount of the inorganic pigments exemplified above is preferably 60% by mass or more with respect to the entire inorganic pigment (B). It is necessary to make it contain so that it may become preferably 70-100 mass%, More preferably, 80-100 mass%. When the amount is not 100% by mass, other pigments (inorganic pigments, organic pigments, carbon black, etc.) can be used as long as the object of the present invention is not impaired. Also, not only black and dark green, but also dark colors such as blue and brown, depending on the desired color, a single type or a combination of multiple types of inorganic pigments using the three primary colors Can be obtained by: The conventional colorant is a combination of an organic pigment or a dye, and the molded product is inferior in weather resistance such as fading and discoloration, whereas in the present invention, since an inorganic pigment is used, Does not cause fading or discoloration. And it can be set as the molded article which continues to exhibit the color derived from an inorganic pigment vividly. Further, as another preferred embodiment for obtaining a dark color layer such as black or deep green, an oxide containing a Co element and a Ni element can be used as the inorganic pigment (B). Examples thereof include (Ni, Co, Fe) (Fe, Cr) ₂ O _{4 and the} like. These can be used individually by 1 type or in combination of 2 or more types. It can also be used in combination with other inorganic pigments.
Moreover, when using the oxide containing Co element and Ni element as said inorganic pigment (B), ratio Co / Ni of content of Co element and Ni element in this composition is 5 / 95-95 / 5. It is preferable. More preferably, it is 10 / 90-90 / 10, More preferably, it is 15 / 85-85 / 15. By setting it as the said range, it can be set as the thermoplastic resin composition which was further excellent in dark-colored coloring property and low heat storage property.
In order to obtain a dark color layer such as black or dark green, the total of the inorganic pigments exemplified above is preferably 15% by mass or more, more preferably, based on the whole inorganic pigment (B). It is necessary to make it contain so that it may become 20-100 mass%, More preferably, it is 25-100 mass%. The balance when not 100% by mass can be other pigments (inorganic pigments, organic pigments, carbon black, etc.) as long as the object of the present invention is not impaired. Also, not only black and dark green, but also dark colors such as blue and brown, depending on the desired color, a single type or a combination of multiple types of inorganic pigments using the three primary colors Can be obtained by:
In any of the above embodiments, when CoO is used as one of the inorganic pigments (B), the content of CoO is preferably 50% by mass or less, more preferably 40%, assuming that the entire inorganic pigment is 100% by mass. It is not more than mass%, more preferably not more than 30 mass%. The balance is other inorganic pigments such as Fe (Fe, Cr) ₂ O ₄ .

The inorganic pigment (B) is preferably a powder, more preferably a fine powder. The shape is not particularly limited, but the maximum length of the powder is preferably 5 nm to 40 μm, more preferably 15 nm to 30 μm. By setting it within the above range, the balance between handleability and impact resistance is excellent.

The low heat storage resin composition of the present invention is characterized by containing a lubricant (C), and the lubricant (C) is necessary so that the composition of the present invention exhibits a wood grain pattern well at the time of molding. Accordingly, it can be added to the composition (I).
A known lubricant can be used as the lubricant (C). Specifically, a compound having a long-chain alkyl group and a functional group, an α-olefin (co) polymer such as ethylene or propylene, a silicon-containing polymer such as dimethylpolysiloxane, an α-olefin and a functional group-containing non-functional group. A copolymer obtained by adding a functional group-containing unsaturated compound to a polymer such as a copolymer with a saturated compound, an ethylene copolymer, a propylene copolymer, an ethylene-propylene copolymer, or a silicon-containing polymer, polyethylene, Examples thereof include polymers obtained by a method of oxidizing polypropylene, ethylene-propylene copolymer and the like and adding a carboxyl group and the like.

Here, examples of the functional group include a carboxyl group or a metal salt thereof, a hydroxyl group, an oxazoline group, an acid anhydride group, an ester group, an amino group, an amide group, an epoxy group, an isocyanate group, a urethane group, and a urea group. . Preferred functional groups are a carboxyl group or a divalent metal salt thereof, an ester group or an amide group. Examples of the carboxyl group salt include metal salts such as sodium, potassium, lithium, calcium, magnesium, aluminum, zinc, barium, cadmium, manganese, cobalt, lead, and tin. As the functional group-containing unsaturated compound, all of the above-mentioned compounds are used. A compound having a long-chain alkyl group and a functional group, or an ethylene copolymer is preferable.

The composition (I) is produced into a pellet by melting and kneading the rubber-reinforced vinyl resin (A) and, if necessary, an inorganic pigment (B) having an infrared reflection property, a lubricant (C), and the like. be able to. Melt kneading can be performed by kneading each component using various extruders, Banbury mixers, kneaders, rolls and the like. When kneading, each component may be kneaded in a lump or may be kneaded by a multistage addition method.
The amount of the rubber-reinforced vinyl resin (A) used in the composition (I) is 75 to 99% by mass, preferably 100% by mass with respect to the total of 100% by mass of the components (A), (B) and (C). It is 80-99 mass%, More preferably, it is 84-99 mass%.
The amount of the inorganic pigment (B) used in the composition (I) is 0 to 13% by mass, preferably 0 to 0% with respect to 100% by mass in total of the components (A), (B) and (C). It is 10 mass%, More preferably, it is 0-8 mass%. If the content of the inorganic pigment (B) is too large, the moldability and impact resistance tend to be inferior.
The amount of the lubricant (C) used in the composition (I) is 0 to 12% by mass, preferably 0 to 10% by mass with respect to 100% by mass in total of the components (A), (B) and (C). %, More preferably 0 to 8% by mass. When the amount of the lubricant (C) is too large, the moldability, appearance of the molded product, etc. tend to be impaired.

Composition (II)
The composition (II) contains the thermoplastic resin (A ′) and the dye and / or pigment (B ′) as essential components, and may contain the lubricant (C) as necessary.

As the thermoplastic resin (A ′), all known thermoplastic resins can be used. In addition to the above rubber reinforced vinyl resin, particularly rubber reinforced styrene resin, other styrene resins, polyethylene, polypropylene, polybutene-1 Polyolefin resins such as nylon 6,6, nylon 6, nylon 11, nylon 12, nylon 4,6 and other polyamides, polyesters such as polybutylene terephthalate and polyethylene terephthalate, wholly aromatic polyesters, polycarbonate resins, polyoxymethylene, etc. Polyether resins, polyphenylene sulfides, polyamide elastomers, and the like. These may be used alone or in combination of two or more. Preferred thermoplastic resins (A ′) are the above rubber reinforced vinyl resins, especially rubber reinforced styrene resins, other styrene resins, polyamides, polyesters, polycarbonate resins, and particularly preferred thermoplastic resins (A ′) are The rubber-reinforced vinyl resin and the styrene resin, particularly those containing 10 to 90% by mass of α-methylstyrene as a copolymer component with respect to the whole thermoplastic resin (A ′) have a woodgrain pattern. It is preferable in terms of sharpness. When the component (A) contains a rubber reinforced vinyl resin, the composition of the rubber reinforced vinyl resin constituting the thermoplastic resin (A ′) may be the same as or different from the composition of the former rubber reinforced vinyl resin. Good.

As the dye and / or pigment (B ′), at least one selected from the group consisting of the inorganic pigment (B) and a pigment other than the inorganic pigment (B) and a dye can be used.
As the pigment other than the inorganic pigment (B), known inorganic pigments and organic pigments can be used. Examples of such known inorganic pigments include zinc oxides such as zinc white and titanium yellow, titanium oxides such as titanium white, calcinations, ultramarine, cobalt blue, iron oxides such as bengara, carbon black, iron sulfide, Examples include sulfides such as cadmium sulfide, chromates such as lead chromate and zinc chromate, carbonates, and metal powders. Among these, iron oxide, carbon black, ultramarine, etc. Can be preferably used. However, among these inorganic pigments, those belonging to the inorganic pigment (B) are excluded. Examples of organic pigments include perinones, fluorescent brighteners, phthalocyanines, quinacridones, permanent reds, lake reds, fast yellows and other azos, nitrosos, nitros, etc. A phthalocyanine series or the like can be preferably used. Examples of the dyes include chlorinated dye-based lakes such as heterocyclic, anthraquinone, azo, perinone, and rhodamine lakes.

The composition (II) is produced into a pellet by melting and kneading the thermoplastic resin (A ′), the dye and / or pigment (B ′), and, if necessary, the lubricant (C). Can do. Melt kneading can be performed by kneading each component using various extruders, Banbury mixers, kneaders, rolls and the like. When kneading, each component may be kneaded in a lump or may be kneaded by a multistage addition method.
The amount of the thermoplastic resin (A ′) used in the composition (II) is 18 to 99% by mass, preferably 100% by mass of the total of the components (A ′), (B ′) and (C). Is 25 to 99 mass%, more preferably 32 to 99 mass%.
The amount of the dye and / or pigment (B ′) used in the composition (II) is 1 to 70 mass with respect to 100 mass% of the total of the components (A ′), (B ′) and (C). %, Preferably 1 to 65% by mass, more preferably 1 to 60% by mass. When the content of the dye and / or pigment (B ′) is too small, the colorability of the wood grain pattern tends to be inferior, and when too large, the moldability and impact resistance tend to be inferior.
The amount of the lubricant (C) used in the composition (II) is 0 to 12% by mass, preferably 0 to 0% with respect to 100% by mass in total of the components (A ′), (B ′) and (C). It is 10 mass%, More preferably, it is 0-8 mass%. When the amount of the lubricant (C) is too large, the moldability, appearance of the molded product, etc. tend to be impaired.

The low heat storage resin composition of the present invention is obtained by dry blending the pellet made of the composition (I) and the pellet made of the composition (II). By dry blending, a clear wood grain pattern can be obtained when molded. Dry blending can be performed with a tumbler or the like. The blending ratio of the pellet made of the composition (I) and the pellet made of the composition (II) is 0.1 to 30 pellets made of the composition (II) with respect to 100 parts by mass of the pellet made of the composition (I). It is a mass part, Preferably it is 0.2-20 mass part, More preferably, it is 0.5-15 mass part. Outside this range, a clear woodgrain pattern cannot be obtained.

In the low heat storage resin composition of the present invention, the amount of the inorganic pigment (B) having infrared reflection characteristics contained in the composition is 0.5 to 13% by mass, preferably based on the entire composition. It is 1.0-10 mass%, More preferably, it is 1.0-8 mass%. When the content of the inorganic pigment (B) is too small, sufficient low heat storage property cannot be obtained and the colorability tends to be inferior. On the other hand, when the content is too large, the moldability and impact resistance tend to be inferior. It is in. Moreover, in this invention, the effect that a weather resistance improves further by using the said inorganic pigment (B) is acquired. The inorganic pigment (B) may be contained in any one of the composition (I) and the composition (II), or may be contained in both, but the low heat storage resin composition of the present invention. It is necessary to satisfy the above content as a whole.

In the low heat storage resin composition of the present invention, the amount of the lubricant (C) contained in the composition is 1 to 12% by mass, preferably 2 to 8% by weight, based on the entire composition. If it is less than 1% by weight, a clear wood grain pattern may not be obtained. On the other hand, if it exceeds 12% by weight, surging may occur during melt-kneading and kneading may not be possible. The lubricant (C) may be contained in any one of the composition (I) and the composition (II), or may be contained in both, but the entire low heat storage resin composition of the present invention. It is necessary to satisfy the above content.

The low heat storage resin composition of the present invention can contain various additives as required. Examples of such additives include antioxidants, plasticizers, colorants, flame retardants, fillers, lubricants, antistatic agents, and the like. These additives may be contained in either one of the composition (I) and the composition (II) or in both.

Furthermore, the low heat storage resin composition of the present invention is characterized in that the temperature rise of a molded product obtained under the following test conditions is 73 ° C. or less, and the heat storage performance can be evaluated based on the test conditions. This temperature rise is preferably 68 ° C. or lower, more preferably 65 ° C. or lower. The requirement for such a temperature increase value can be achieved by appropriately adjusting the content of each of the above components constituting the composition (I) and the composition (II).
〔Test conditions〕
A molded article (length 80 mm, width 55 mm, thickness 2.5 mm) made of the low heat storage resin composition was conditioned for 60 minutes in a room adjusted to a temperature of 25 ± 2 ° C. and a humidity of 50 ± 5% RH. Thereafter, the surface temperature of the molded article after the surface is irradiated with an infrared lamp (output 100 W) for 60 minutes from a height of 200 mm is measured, and the difference from the initial temperature before irradiation with the infrared lamp is defined as a temperature rise.

The low heat storage resin composition of the present invention thus obtained can be molded into various molded articles such as sheets and films by injection molding, sheet extrusion, vacuum molding, foam molding and the like.

The low heat storage resin composition of the present invention is excellent in molding processability, and the obtained molded product is prevented from storing heat, improved in heat resistance (change in dimensions), and improved in weather resistance and impact resistance. It can be suitably used for structural members of indoor houses such as window frames, structural members of outdoor houses such as rain gutters, automobile interior parts and the like.

Hereinafter, the present invention will be described more specifically with reference to examples. In Examples and Comparative Examples, parts and% are based on mass unless otherwise specified.
1. Evaluation Method The evaluation method used in this example is as follows.
(1) In a chamber adjusted to a heat storage temperature of 25 ± 2 ° C. and a humidity of 50 ± 5% RH, the surface of the test piece I having a length of 80 mm, a width of 55 mm, and a thickness of 2.5 mm is irradiated with an infrared lamp from a height of 200 mm. (Output 100W) was irradiated, and the surface temperature of the test piece I after 60 minutes was measured using a surface thermometer. The unit is ° C.

(2) Weather resistance Length 80 mm, width 55 mm, thickness 2.5 mm test piece I using a sunshine weatherometer (manufactured by Suga Test Instruments Co., Ltd.), rain cycle 18 minutes / 120 minutes, black panel temperature 63 After exposure for 3000 hours, the color change value ΔE before and after exposure was calculated.
ΔE was calculated from the following equation by measuring the degree of color change Lab (L: brightness, a: redness, b: yellowness) using a multi-light source spectrometer (manufactured by Suga Test Instruments Co., Ltd.).
ΔE = √ [(L ₁ −L ₂ ) ² + (a ₁ −a ₂ ) ² + (b ₁ −b ₂ ) ² ]
(In the formula, L ₁ , a ₁ , and b ₁ represent values before exposure, and L ₂ , a ₂ , and b ₂ represent values after exposure.)
The smaller the value of ΔE, the smaller the color change and the better the color tone. The evaluation criteria are as follows.
A: ΔE is 5 or less.
Δ: ΔE is more than 5 and less than 10.
X: ΔE is 10 or more.

(3) Colorability of wood grain pattern Test piece I having a length of 80 mm, a width of 55 mm, and a thickness of 2.5 mm was visually evaluated. The evaluation criteria are as follows.
○: Vivid wood grain pattern.
Δ: Slightly inferior to ○ mark.
X: Defect.

(4) The length after leaving the test piece II having a heat resistance length of 4000 mm, a width of 55 mm, and a thickness of 2.5 mm in an environment of 25 ° C. and 50% RH for 3 hours is defined as L1. Next, the surface of the test piece II was irradiated under the same conditions as in the heat storage evaluation, and the length of the test piece II was measured. This length is L2. ΔL = L2−L1 was evaluated as follows.
A: ΔL is less than 12 mm.
Δ: ΔL is 12 mm or more and less than 20 mm.
X: ΔL is 20 mm or more.

2. 2. Preparation of thermoplastic resin 2-1. Ingredient (A-1)
Production Example 1 [Production of acrylic rubber-reinforced vinyl resin (A-1)]
(1) Production of acrylic rubbery polymer latex (a latex) In a reactor having a capacity of 5 L, water 140 parts, disproportionated potassium rosinate 1 part, β-naphthalenesulfonic acid formalin condensate sodium salt 1.5 Part and sodium hydrogen carbonate 1 part were added, and the internal temperature was raised to 60 ° C. under a nitrogen stream while stirring. At this point, a mixture of 9 parts of n-butyl acrylate and 0.1 part of allyl methacrylate, 0.025 part of potassium persulfate and 2 parts of water was added, the temperature was raised to 75 ° C., and the reaction was carried out for 1 hour. I did it. Next, an aqueous solution consisting of 0.5 parts of higher fatty acid sodium soap and 12 parts of water, an aqueous solution consisting of 0.15 parts of potassium persulfate and 80 parts of water, and then 90 parts of n-butyl acrylate while maintaining at 75 ° C. A mixture of 0.9 parts of allyl methacrylate was continuously added over 2 hours and kept at 75 ° C. for 30 minutes after the addition to complete the polymerization reaction. The weight average particle diameter of acrylic rubbery polymer particles of the obtained a latex was 290 nm, and the gel content was 94%.

(2) Production of acrylic rubber-reinforced vinyl resin (A-1) A reactor with a capacity of 5 L was charged with 100 parts of a latex (in terms of solid content) and 180 parts of water (however, including latex water) and stirred. The temperature was raised to 40 ° C. under a nitrogen stream. At this point, 0.3 part glucose, 1.2 parts sodium pyrophosphate, 0.01 parts ferrous sulfate and 20 parts water, t-butyl hydroperoxide 0.12 parts, disproportionated rosin acid An aqueous solution consisting of 0.72 parts of potassium and 9 parts of water was added. The temperature is then raised to 75 ° C., at which point from a mixture of 73 parts of styrene and 27 parts of acrylonitrile, 2.8 parts of t-butyl hydroperoxide, 1.7 parts of disproportionated potassium rosinate and 20 parts of water. The aqueous solution was added, and while maintaining the temperature at 75 ° C., the former was continuously added for 3 hours and the latter was continuously added for 3.5 hours. After completion of the latter addition, the polymerization was terminated by maintaining at 75 ° C. for 60 minutes. The polymerization conversion rate was 95%. This copolymer latex was coagulated, washed with water, and dried to obtain a powdery acrylic rubber-reinforced vinyl resin (A-1). The graft ratio was 79%, and the rubber component content was 53%.

2-2. Ingredient (A-2)
Production Example 2 [Production of Styrene-acrylonitrile-methyl methacrylate copolymer (A-2)]
After connecting two jacketed polymerization reaction vessels equipped with ribbon wings with an internal volume of 30 L and purging with nitrogen, 23 parts of styrene, 18 parts of acrylonitrile, 59 parts of methyl methacrylate and 20 parts of toluene were added to the first reaction vessel. Added continuously. At the same time, a solution composed of 0.12 part of tert-dodecyl mercaptan and 5 parts of toluene and a solution composed of 0.1 part of 1,1′-azobis (cyclohexane-1-carbonitrile) and 5 parts of toluene were continuously supplied. The polymerization temperature of the first group was controlled at 110 ° C., the average residence time was 2 hours, and the polymerization conversion was 57%. The obtained copolymer solution was continuously taken out in the same amount as the first supply amount by a pump provided outside the first reactor and supplied to the second reactor. The polymerization temperature of the second reaction vessel was 130 ° C., and the polymerization conversion was 70%. The copolymer solution obtained in the second reaction vessel was devolatilized from the unreacted monomer and solvent under the conditions of 200 to 250 ° C. and a vacuum degree of −600 mmHg, using an extruder with a biaxial three-stage vent. Then, a copolymer (A-2) having a bound methyl methacrylate content of 72%, a bound styrene content of 21%, a bound acrylonitrile content of 7%, and an intrinsic viscosity [η] of 0.5 dl / g was obtained as pellets.

2-3. Ingredient (A-3)
AES resin (manufactured by Techno Polymer Co., Ltd., “Techno AES W270” (trade name)) was used.
2-4. Ingredient (A-4)
An α-methylstyrene-acrylonitrile copolymer (α-methylstyrene unit / acrylonitrile unit = 73/27 (%)) was used. The intrinsic viscosity [η] was 0.8 dl / g.
2-5. Ingredient (A-5)
A composition comprising the following components was used.
100 parts by weight of polyvinyl chloride resin (molecular weight 1000),
Stabilizer (Ca / Zn, one pack product) 4.2 parts by weight,
2 parts by weight of PMMA (molecular weight: 2 million),
4 parts by weight of reinforcing agent (acrylic rubber),
10 parts by weight of calcium carbonate

3. Inorganic pigment (low heat storage agent)
Ingredient (B-1): Trade name “Fellow Color 42-703A”, manufactured by Nippon Fellow, Fe and Cr composite oxide (chemical composition is Cr ₂ O ₃ ; 88-91%, Fe ₂ O ₃ ; 7 -10% and the color is black).
Component (B-2): trade name “Fellow Color 42-350A”, manufactured by Nippon Fellow, a composite oxide of Fe and Mn, which is yellow in color.
Ingredient (B-3); trade name “Fellow Color 42-303B”, manufactured by Nippon Fellow Co., Ltd., complex oxide of Cu, Cr and Mn, the color is brown.
Component (B-4); carbon black.

4). Lubricant component (C-1); magnesium stearate.

5. Examples 1-3 and Comparative Examples 1-3
5-1. Preparation of test piece I (single layer sheet) (1) Preparation of pellet I Ingredients shown in Pellet I column in Table 1 were mixed for 3 minutes using a Henschel mixer at the blending ratio shown in the same table, and then cylinder setting Pellet I was obtained by melt-kneading using a 50 mmφ extruder having a temperature of 200 ° C.
(2) Preparation of pellet II The components shown in the column of pellet II in Table 1 were mixed for 3 minutes using a Henschel mixer at the blending ratio shown in the table, and then using a 50 mmφ extruder with a cylinder set temperature of 200 ° C. Pellets II were obtained by melt-kneading.
(3) Preparation of mixed pellets of pellet I and pellet II Pellets I and pellets II in the mixing ratio shown in Table 1 were mixed for 3 minutes using a tumbler to obtain mixed pellets. Next, the mixed pellet was dried at 80 ° C. for 1 hour.

(4) Preparation of test pieces I and II (single layer sheet)
Using a 40 mmφ extruder equipped with a T die, the cylinder set temperature was set to 200 ° C., and the screw rotation speed and take-up speed were appropriately adjusted to obtain a sheet having a width of 55 mm and a thickness of 2.5 mm from the mixed pellet. A test piece I having a length of 80 mm, a width of 55 mm, and a thickness of 2.5 mm and a test piece II having a length of 4000 mm, a width of 55 mm, and a thickness of 2.5 mm were obtained from this sheet.

(5) Evaluation The obtained test piece I was evaluated by the method described above. The evaluation results are shown in Table 2.

Examples 1 to 3 are low heat storage resin compositions within the scope of the present invention, and the intended effect of the present invention is obtained.
Comparative Example 1 is an example in which the amount of the inorganic pigment having infrared reflection characteristics is less than the range of the present invention, and the weather resistance and the color of the wood grain pattern are inferior. Comparative Example 2 is an example in which carbon black is used in place of the inorganic pigment having infrared reflection characteristics, and has a large heat storage property, and is inferior in weather resistance, wood grain pattern coloring and heat resistance. Comparative Example 3 is an example in which the component (A-5), which is a vinyl chloride resin, was used instead of the component (A-1) and the component (A-2) of Comparative Example 2, and the heat storage property was large and the weather resistance was high. Property, colorability of wood grain pattern and heat resistance are poor.

The low heat storage resin composition of the present invention is a molded product excellent in molding processability, having a grain-like appearance, low heat storage, weather resistance, wood grain pattern coloring, heat resistance, etc. Therefore, it can be used for various molded products in the building material field, the vehicle field, and the like, in which the temperature rise during sunlight irradiation is a problem.

Claims (6)

It is a composition obtained by dry blending 100 parts by mass of pellets comprising the following composition (I) and 0.1 to 30 parts by mass of pellets comprising the following composition (II), and is contained in the composition The amounts of the inorganic pigment (B) and the lubricant (C) having infrared reflection properties are 0.5 to 13% by mass and 1 to 12% by mass, respectively, with respect to the entire composition. A low heat storage resin composition exhibiting a woodgrain pattern, characterized in that the temperature rise obtained under test conditions is 73 ° C. or less.
Composition (I): 75-99% by mass of rubber-reinforced vinyl resin (A), 0-13% by mass of inorganic pigment (B) having infrared reflection characteristics, and 0-12% by mass of lubricant (C) are melt-kneaded. A thermoplastic resin composition (however, the total of the above components (A), (B) and (C) is 100% by mass).
Composition (II): 18-99% by mass of thermoplastic resin (A ′), 1-70% by mass of dye and / or pigment (B ′), and 0-12% by mass of lubricant (C) are melt-kneaded. A thermoplastic resin composition (provided that the total of the components (A ′), (B ′) and (C) is 100% by mass).
〔Test conditions〕
A molded article (length 80 mm, width 55 mm, thickness 2.5 mm) made of the low heat storage resin composition was conditioned for 60 minutes in a room adjusted to a temperature of 25 ± 2 ° C. and a humidity of 50 ± 5% RH. Thereafter, the surface temperature of the molded article after the surface is irradiated with an infrared lamp (output 100 W) for 60 minutes from a height of 200 mm is measured, and the difference from the initial temperature before irradiation with the infrared lamp is defined as a temperature rise. The low heat storage resin composition according to claim 1, wherein the rubber-reinforced vinyl resin (A) contains a non-diene rubber polymer as the rubber polymer (a). The low heat storage resin composition according to claim 2, wherein the rubber-reinforced vinyl resin (A) contains an acrylic rubber as the rubber polymer (a). The low heat storage resin composition according to claim 2 or 3, wherein the rubber-reinforced vinyl resin (A) contains a (meth) acrylic acid ester compound as a copolymer component. The thermoplastic resin (A ') is a styrene resin containing 10 to 90% by mass of α-methylstyrene as a copolymerization component with respect to the whole thermoplastic resin (A'). The low heat storage resin composition of any one of Claims 1. The sheet | seat or film formed by shape | molding the low heat storage resin composition of any one of Claims 1 thru | or 5.