| CPC C08L 33/10 (2013.01) [C08F 212/08 (2013.01); C08F 220/14 (2013.01); C08K 5/005 (2013.01); C08K 5/3435 (2013.01); C08K 5/3492 (2013.01); C08L 51/04 (2013.01)] | 4 Claims |
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1. A thermoplastic resin composition comprising:
a methacrylate copolymer (A) obtained by polymerizing a vinyl monomer mixture (m1) containing a methyl methacrylate monomer, an aromatic vinyl monomer, and optionally other monomers which are different from the methyl methacrylate monomer and the aromatic vinyl monomer;
a hindered amine compound (C) having a molecular weight of 200 to 1800; and
an ultraviolet absorber compound (D) having a maximum absorption wavelength at 250 to 300 nm,
wherein:
the thermoplastic resin composition does not include a graft copolymer (B) which is obtained by graft-polymerizing 20 to 80% by mass of a vinyl monomer mixture (m2) in the presence of 20 to 80% by mass of a rubber polymer (b1) (with the proviso that a sum of the total amounts of the rubber (b1) and the vinyl monomer mixture (m2) is 100% by mass), and has a graft ratio of 10 to 150%, wherein the rubber polymer (b1) is at least one selected from the group consisting of a diene rubber polymer, an acrylic rubber polymer, an olefin rubber polymer, and a silicone rubber polymer, and the vinyl monomer mixture (m2) comprises 65 to 82% by mass of an aromatic vinyl monomer and 18 to 35% by mass of a vinyl cyanide monomer, based on the total mass of the vinyl monomer mixture (m2);
the methyl methacrylate monomer is present in an amount of 70% by mass or more and less than 78% by mass, the aromatic vinyl monomer is present in an amount of 12 to 30% by mass, and the other monomers are optionally present in an amount of 10% by mass or less, each based on a total mass of the vinyl monomer mixture (m1),
the ultraviolet absorber compound (D) is 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5 [2-(2-ethylhexanoyloxy) ethoxy]phenol,
the hindered amine compound (C) is bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and
the hindered amine compound (C) is present in an amount of 0.4 to 1.0 parts by mass, the ultraviolet absorber compound (D) is present in an amount of 0.2 to 0.5 parts by mass, and a sum of the amounts of the hindered amine compound (C) and the ultraviolet absorber compound (D) is 0.5 to 1.5 parts by mass, each relative to 100 parts by mass of the methacrylate copolymer (A), and
the thermoplastic resin composition shows a color tone (L*) of 3.2 to 3.4 measured using an SCE type colorimeter with respect to a molded product of the thermoplastic resin composition, wherein the molded product has a length of 100 mm, a width of 100 mm and a thickness of 3 mm and is obtained by molding under conditions of a cylinder set temperature of 260° C. and a mold temperature of 30° C.
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