US Patent:
20030153696, Aug 14, 2003
Inventors:
Ryuichi Saito - Maebashi-shi, JP
Tadashi Amano - Kashima-gun, JP
Toshihiko Kawakubo - Lake Jackson TX, US
Assignee:
Shin-Etsu Chemical Co., Ltd. - Tokyo
International Classification:
C08F002/38
US Classification:
526/082000, 526/319000, 526/335000, 526/330000, 526/346000, 526/343000, 526/344000
Abstract:
A production process for a vinyl-based polymer is provided. The production process comprises a step for polymerizing a vinyl-based monomer by a radical reaction within an aqueous medium in a polymerization vessel, and a step for supplying a reaction inhibitor with a melting point of no more than 40 C. from a reaction inhibitor supply tank to the polymerization vessel via a reaction inhibitor supply pipe. The reaction inhibitor supply tank and the reaction inhibitor supply pipe are heated, and the reaction inhibitor is added to the polymerization vessel in a liquid state with a viscosity of no more than 200 mPas. The reaction inhibitor can be added to the polymerization mixture without the use of an organic solvent even at low temperatures, and problems such as the solidification of the reaction inhibitor inside the supply tank or piping, and subsequent blocking of the piping do not occur.