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:
Nov. 14, 1978
Filed:
Jan. 06, 1977
Applicant:
Inventor:
Vasanth R Kamath, Tonawanda, NY (US);
Assignee:
Pennwalt Corporation, Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C08F / ; C08F / ;
U.S. Cl.
CPC ...
526 73 ; 526228 ; 526346 ;
Abstract
A process for the free-radical polymerization of a vinyl monomer, including vinyl aromatic monomer, at least two distinct, progressively higher polymerization temperatures, each between the temperatures of from about 50.degree. C and 130.degree. C, in the presence of at least two free-radical initiators, one of which, used in relatively minor proportions, is di-t-butyl diperoxycarbonate and the other, used in relatively major proportions, has a ten hour half-life temperature below 90.degree. C. The distinct temperatures for polymerization may occur as separate parts of a polymerization in which the temperature of the system continually increases.