The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1998
Filed:
Apr. 02, 1997
Shigeki Takada, Kurashiki, JP;
Kuraray Co., Ltd., Kurashiki, JP;
Abstract
There is disclosed a process for producing a vinyl resin by suspension polymerization of a vinyl compound in the presence of a suspending agent (A) which comprises using a polymerization vessel equipped with a reflux condenser and adding a polyvinyl alcohol (B) having a degree of hydrolysis of at most 85 mol % in an amount of 0.001 to 0.5 part by weight based on 100 parts by weight of said vinyl compound when a polymerization conversion is in the range of 30 to 90%. According to the present invention, there is provided a process for producing a vinyl resin having a high bulk density, which is excellent in anti-foaming effect against the dry foam being generated in the middle to latter period of the suspension polymerization in a polymerization vessel equipped with a reflux condenser which is excellent in productivity.