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:
Oct. 15, 1985
Filed:
Dec. 10, 1984
Applicant:
Inventor:
Alvin R Ingram, West Chester, PA (US);
Assignee:
Atlantic Richfield Company, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521 60 ; 521 56 ;
Abstract
The absorption of water by styrene/maleic anhydride copolymer particles during the impregnation of the particles in aqueous suspension is greatly reduced by the addition of salt to the impregnation system. This process produces expandable particles of non-equimolar copolymers of styrene and maleic anhydride having considerable less heterogeneity, finer cell structure, greater expandability, less heat sensitivity, less shrinkage, and lower density potential on molding.