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:
Feb. 10, 1998
Filed:
Oct. 23, 1996
Applicant:
Inventor:
Shigeki Takada, Kurashiki, JP;
Assignee:
Kuraray Co., Ltd., Kurashiki, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526202 ; 524459 ; 524503 ; 525 61 ;
Abstract
A vinyl compound is polymerized under suspension polymerization conditions by polymerizing the vinyl compound in a suspension polymerization medium containing, as the suspending agent, from 0.02 to 0.2 parts by weight of a polyvinyl alcohol polymer (A) having a degree of hydrolysis ranging from 60 to 95 mol % and a terminal mercapto group, based on 100 parts by weight of the vinyl compound. In another aspect of the invention, the suspending agent is a combination of said polyvinyl alcohol polymer (A) and a polyvinyl ester (B) having a degree of hydrolysis less than 60 mol %. The weight ratio of the two polymeric suspending agents (A)/(B) ranges from 40/60 to 95/5.