Vinyl chloride resin composition
AssigneeKanegafuchi Kagaku Kogyo Kabushiki Kaisha
InventorsAkira Takaki, Hiroto Mori, Toshihiko Hasegawa
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Abstract
A vinyl chloride resin composition having an improved impact resistance with a good transparency that the vinyl chloride resin itself possesses originally; which comprises (A) a graft copolymer prepared by (i) adding a water-soluble electrolyte to a butadiene polymer (a) (ii) adding a monomer mixture (b) containing mainly an aromatic vinyl monomer to polymerize, (iii) adding a monomer mixture (c) containing mainly an alkyl methacrylate to polymerize and (iv), when desired, adding a monomer mixture (d) containing mainly an aromatic vinyl monomer.
Claims4
A vinyl chloride resin composition which comprises:
- (A) 1 to 30% by weight of a graft copolymer and
- (B) 99 to 70% by weight of a vinyl chloride resin;
- said graft copolymer (A) being prepared by
- (i) adding a water-soluble electrolyte to an aqueous latex containing 50 to 85 parts by weight of a butadiene polymer (a) of 60 to 100% by weight of butadiene, 40 to 0% by weight of an aromatic vinyl monomer, 10 to 0% by weight of a vinyl monomer copolymerizable therewith and 5 to 0% by weight of a crosslinkable monomer, said butadiene polymer (a) having an average particle size of less than 0.1 .mu.m,
- (ii) adding 1 to 45 parts by weight of a monomer mixture (b) to said latex and carrying out the polymerization, said monomer mixture (b) comprising 51 to 100% by weight of an aromatic vinyl monomer, 49 to 0% by weight of an alkyl methacrylate and 0 to 20% by weight of a vinyl monomer copolymerizable therewith,
- (iii) adding 5 to 45 parts by weight of a monomer mixture (c) to the polymerization mixture in the step (ii) and carrying out the polymerization, said monomer mixture (c) comprising 51 to 100% by weight of an alkyl methacrylate, 49 to 0% by weight of an aromatic vinyl monomer and 0 to 20% by weight of a vinyl monomer copolymerizable therewith, and
- (iv) adding 0 to 30 parts by weight of a monomer mixture (d) to the polymerization mixture in the step (iii) and carrying out the polymerization, said monomer mixture (d) comprising 51 to 100% by weight of an aromatic vinyl monomer, 49 to 0% by weight of an alkyl methacrylate and 0 to 20% by weight of a vinyl monomer copolymerizable therewith;
- the total amount of the polymer (a), the mixture (b), the mixture (c) and the mixture (d) being 100 parts by weight.
Dependencies are inferred from the claim text.