Polymer scale depostion preventive agent and a process for producing polymers using the same

U.S. Patent Number: 5728781

Abstract: A polymer scale deposition preventive agent comprising (a) an aromatic compound having at least eight conjugated .pi. bonds and having a molecular weight of 1,000 or more, and (b) a polyalkylene oxide having a weight-average molecular weight of 2,000 or more, wherein the weight ratio of the component (a) to the component (b) is 100/500 to 100/1, can prevent surely the deposition of polymer scale even in a polymerization system containing a monomer, such as styrene, acrylic acid esters or acrylonitrile, which has a high solvency for a coating film consisting of the conventional polymer scale deposition preventive agent.

Inventors: Usuki; Masahiro (Annaka, JP), Shimizu; Toshihide (Urayasu, JP)

Assignee: Shin-Etsu Chemical Co., Ltd. (Tokyo, JP)

Application Number: 08/704,865

Issued: 1998-03-17

Expired: 2006-03-17

Classes: 526/62

Field of search: 526/62

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