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. 01, 1991
Filed:
Jan. 25, 1991
Applicant:
Inventor:
John Biale, Anaheim, CA (US);
Assignee:
Union Oil Company of California, Los Angeles, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C09D / ;
U.S. Cl.
CPC ...
523201 ; 524458 ; 525309 ; 525310 ; 525902 ; 428407 ;
Abstract
A core/shell polymer is capable of increasing a composition's whiteness of opacity. The shell polymer has either a crystalline structure of a T.sub.g of at least about 50.degree. C. The shell polymer comprises (i) at least one nonionic monomer selected from the group consisting of soft alkyl acrylate monomers, soft methacrylate ester monomers, and mixtures thereof, and (ii) at least one additional nonionic monomer. The core has a different composition than the composition of the shell and a T.sub.g of at least about 50.degree. C. The core comprises alkenyl aromatic monomers. The core and shell polymers are homopolymers or copolymers.