US 4,052,482 AGranted

Vinyl chloride polymer composition

AssigneeMitsubishi Rayon Co., Ltd.

InventorsFumio Ide, Kazuo Kishida, Akira Hasegawa

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Abstract

A thermoplastic vinyl chloride polymer composition superior in processing properties is provided. The composition comprises (I) a predominant amount of polyvinyl chloride or a copolymer predominantly comprised of vinyl chloride and (II) a minor amount of two stage sequentially produced methyl methacrylate composite polymer consisting essentially of 1 to 49 wt. % of component A polymerized from a monomer or monomer mixture of 90 to 100 wt. % of methyl methacrylate and 0 to 10 wt. % of at least one copolymerizable unsaturated monomer, said component A having a glass transition temperature of at least 75.degree. C and a reduced viscosity of 1.8 to approximately 10; and 51 to 99 wt. % of component B polymerized onto or in the presence of said component A from a monomer mixture of 55 to 90 wt. % of a methyl methacrylate, 10 to 45 wt. % of an acrylic acid ester and 0 to 20 wt. % of at least one unsaturated monomer copolymerizable with methyl methacrylate and the acrylic acid ester, said component B exhibiting, if polymerized in the absence of said component A, a glass transition temperature of 25.degree. to 80.degree. C and a reduced viscosity of 1.8 to 10.

Claims5

Dependent claims

A thermoplastic vinyl chloride polymer composition of improved processability which comprises

1. 70 to 99.9 parts by weight of polyvinyl chloride or a copolymer of no less than 80% by weight of vinyl chloride and no greater than 20% by weight of at least one other copolymerizable ethylenically unsaturated monomer, and
2. 0.1 to 30 parts by weight of a two stage sequentially produced methyl methacrylate composite polymer consisting essentially of
1 to 49% by weight of component A polymerized from a monomer or a monomer mixture of 90 to 100% by weight of methyl methacrylate and 0 to 10% by weight of at least one copolymerizable unsaturated monomer, said component A having a glass transition temperature (tg) of at least 75.degree. C and a reduced viscosity (.eta. sp/C) of 1.8 to approximately 10 as determined at 25.degree. C on a solution in chloroform of a concentration of 0.10g/100ml, and ;
51 to 99% by weight of component B polymerized onto or in the presence of said component from a monomer mixture of 55 to 90% by weight of methyl methacrylate, 10 to 45% by weight of acrylic acid ester and 0 to 20% by weight of at least one unsaturated monomer copolymerizable with methyl methacrylate and the acrylic acid ester, said component B exhibiting, if polymerized in the absence of said component A, a glass transition temperature (Tg) of 25.degree. to 80.degree. C and a reduced viscosity (.eta. sp/C) of 1.8 to 10 as determined at 25.degree. C on a solution in chloroform of a concentration of 0.10g/100ml.

1 more element

Dependencies are inferred from the claim text.