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:
Dec. 02, 1986
Filed:
Aug. 29, 1984
Applicant:
Inventors:
Patricia A Gleason, Westfield, NJ (US);
Marie A Piccoline, Somerville, NJ (US);
Assignee:
National Starch and Chemical Corporation, Bridgewater, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; E21B / ;
U.S. Cl.
CPC ...
252-8514 ; 252-8551 ;
Abstract
Cationic emulsion polymers useful as thickening agents in aqueous dense brine solutions are disclosed. The cationic polymers are water-in-oil emulsion polymers of acrylamide or methacrylamide and a cationic monomer. The polymers have an intrinsic viscosity in 1.0 N KCl of at least 1 dl/g and preferably have an acrylamide or methacrylamide to cationic monomer molar ratio of about 60:40 to 95:5.