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:
Jun. 10, 1997
Filed:
Feb. 20, 1996
Applicant:
Inventors:
Junya Watanabe, Tokyo, JP;
Tsunehiko Kurata, Yokohama, JP;
Assignee:
Mitsubishi Chemical Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C08F / ;
U.S. Cl.
CPC ...
521 33 ; 521 32 ; 525344 ; 525353 ; 525354 ; 525355 ; 5253591 ; 525379 ; 525380 ; 5262323 ; 5262325 ; 526227 ;
Abstract
A method for producing a spherical crosslinked copolymer, which comprises polymerizing a monofunctional addition-polymerizable monomer and at least 0.5% by weight of a polyfunctional addition-polymerizable monomer on the basis of the total weight of monomers by suspension polymerization in an aqueous medium in the presence of a radical polymerization initiator of the following formula (b) which has a decomposition temperature for a half-life period of 10 hours within a range of from 60.degree. to 120.degree. C. and which is capable of forming at least four radical initiating points per molecule by the decomposition: