Shin-etsu Chemical Co., Ltd.

Tohru Yokota

Hajime Kitamura

Kaname Inoue

Shoji Ichinohe

Kenichi Isobe

Junichi Watanabe

Takeji Yanagisawa

Ryozo Tanizawa

Junich Watanabe

Hideyuki Asou

A process for preparing a vinyl chloride copolymer which comprises polymerizing a vinyl chloride monomer or a mixture of a major proportion of a vinyl chloride monomer with a minor proportion of a copolymerizable monomer and at least one crosslinking agent selected from polyhydric alcohol diglycidyl ether diacrylates and dimethacrylates. The crosslinking agent is added to the reaction system after polymerization of the vinyl chloride monomer or the mixture proceeds to a certain extent. By this, the resultant copolymer has good processability and good mechanical and electric characteristics.

Process for preparing vinyl chloride copolymers with diacrylate of

A vinyl chloride copolymer is produced by copolymerizing vinyl chloride monomer or a monomer mixture comoposed of vinyl chloride monomer and copolymerizable monomer, with one or more than one kind of cross-linking agent selected from polyhydric alcohol diglycidyl ether diacrylate and dimethacrylate. The vinyl chloride copolymer has good moldability and can be made into moldings having good matte finish surface and also good permanent compression set resistance, creep resistance, heat resistance, and electrical properties.

Process for producing vinyl chloride copolymer

A composite polymeric material having a high permeability to oxygen is proposed comprising a vinyl chloride moiety, an organosilicon moiety and, optionally, a third polymeric moiety. Such a composite polymeric material can be prepared in several ways including copolymerization of vinyl chloride monomer, a polymerizable organosilicon compound and, optionally, a third monomer, graft-polymerization of a polymerizable organosilicon compound on to a polyvinyl chloride resin, graft-polymerization of vinyl chloride on to an organopolysiloxane, graft-copolymerization of vinyl chloride and a polymerizable organosilicon compound on to a third polymer and blending of the respective polymeric components.

Composite polymeric material comprising vinyl chloride and organosilicon

The invention provides a formulation of a vinyl chloride resin-based composition suitable for preparing floppy disc jackets having high heat resistance with a Clash-Berg temperature of 75.degree. C. or higher comprising, as the essential components, (A) a copolymer of viny chloride with a N-substituted maleimide as the comonomer, optionally in combination with a homopolymeric polyvinyl chloride resin, (B) an impact-strength improving agent which is preferably a vulcanizable synthetic rubber and (C) carbon black.

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Ibaraki, Japan

Tohru Yokota