THERMOPLASTIC RESIN COMPOSITION AND RESIN MOLDED ARTICLE

• Main Authors: HIRATA, Koji, TANIGAWA, Hiroshi, SAITOU, Hirotoshi, HAMAMOTO, Shigeki
• Format: Patent
• Language: English; French; German
• Published: 11.09.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

Provided is a thermoplastic resin composition which has excellent continuous moldability and excellent appearance improvability of a molded article. A thermoplastic resin composition comprising 18 to 44 parts by mass of a copolymer (A) and 56 to 82 parts by mass of a copolymer (B) so that the total thereof is 100 parts by mass, and further comprising 0.1 to 0.3 parts by mass of an alkaline earth metal oxide (M) with respect to 100 parts by mass of the total of the graft copolymer (A) and the copolymer (B). Graft copolymer (A): a graft copolymer obtained by graft copolymerization of 35 to 65 parts by mass of a monomer mixture (II) containing 60 to 95 percent by mass of an aromatic vinyl based monomer and 5 to 40 percent by mass of a vinyl cyanide based monomer in the presence of 35 to 65 parts by mass of a composite rubber polymer (I). The polymer (I) is composed of 5 to 90 percent by mass of a diene rubber (i) and 95 to 10 percent by mass of a cross-linked acrylic acid ester polymer (ii). The rubber (i) is obtained from a small particulate diene rubber and an acid group-containing copolymer. The polymer (I) has a mass average particle diameter of 180 to 500 nm. Copolymer (B): a copolymer obtained by polymerization of a monomer mixture containing 60 to 95 percent by mass of an aromatic vinyl based monomer and 5 to 40 percent by mass of a vinyl cyanide based monomer.