Shin-etsu Chemical Co., Ltd.

Kenji Fushimi

Toshihide Shimizu

Shunichi Koyanagi

Susumu Ueno

Hajime Kitamura

Shigehiro Hoshida

Kouiti Kuroda

A vinyl chloride-based resin is compounded with a filler, e.g. calcium carbonate, having been treated on the surface with an epoxy compound such as 3-glycidyloxypropyl trimethoxy silane in advance and the resin composition is shaped into an article which is then subjected to a low temperature plasma treatment. The thus obtained shaped article is imparted with remarkably improved surface properties such as decrease in the phenomenon of plasticizer bleeding and the effect is very durable even after prolonged outdoor exposure of the article.

Method for the preparation of shaped articles of a vinyl chloride-based

A method for polymerizing vinyl chloride in an aqueous suspension wherein polymer scale is prevented from depositing on walls and other surfaces in contact with monomer in a polymerization reactor. According to the method, one or more compounds selected from iodine salts of alkali metals and alkaline earth metals are added to the polymerization mixture. The effect of this method can be enhanced synergistically by coating a polar organic compound or an organic dye over the surfaces in contact with the monomer.

Polymerizing vinyl chloride with lowering of scale formation

In the polymerization of at least one ethylenically unsaturated monomer other than vinyl chloride, deposition of polymer scale on the inner walls of a polymerization reactor and other surfaces coming into contact with the monomer is effectively prevented (regardless of the type of polymerization used, so long as it takes place in a heterogeneous phase) by coating the surfaces of the reactor with at least one compound selected from organic electron donor compounds and organic electron-acceptor compounds prior to polymerization; the compound or compounds having been or being brought into contact with an oxidizing agent, a reducing agent, an acid or a base, or having been or being irradiated with ultraviolet light.

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Joetsu, Japan

Kenji Fushimi