Vinyl chloride copolymer and composition containing the same
AssigneeKanegafuchi Kagaku Kogyo Kabushiki Kaisha
InventorsKazumasa Yamane, Masahiro Kobayashi, Masaniko Takada
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Abstract
A copolymer comprising (a) vinyl chloride or a mixture of vinyl chloride and a monomer copolymerizable therewith and (b) 1,2-polybutadiene oligomer and/or epoxidized 1,2-polybutadiene oligomer. The plasticized copolymer can be molded into soft moldings having a low compression set and high tensile and tear strengths. Also, by the incorporation of the copolymer into vinyl chloride homopolymer or copolymers, hard moldings having delustered surface can be obtained without conducting delustering operation.
Claims1
A composition comprising (A) a copolymer prepared by polymerizing a reaction system comprising a monomeric mixture of (a) vinyl chloride or a mixture of at least 50% by weight vinyl chloride and a monomer copolymerizable therewith and (b) 0.001 to 10 parts by weight per 100 parts by weight of the monomeric component (a) of a compound having the following general formula:
- ##STR3## wherein X and Y are independently hydrogen, hydroxyl or carboxyl, n is an integer of 2 to 100 and m is 0 or an integer of 1 to 80,
- the polymerization being carried out employing a free-radical polymerization initiator;
- and
- (B) 25 to 200 parts by weight of a plasticizer per 100 parts by weight of said copolymer, the composition giving a molding having a compression set of not more than 50% and a tensile strength of not less than 1.30 kg/mm.sup.2.
Dependencies are inferred from the claim text.