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:
Apr. 14, 1998
Filed:
Sep. 13, 1995
Chi-San Wu, Wayne, NJ (US);
James Curry, Wayne, NJ (US);
James P Cullen, Bartonsville, PA (US);
John S Mc Ewan, Paducah, KY (US);
ISP Investments Inc., Wilmington, DE (US);
Abstract
A method of stabilizing an aqueous solution of an acid copolymer of maleic acid and a C.sub.1 -C.sub.5 alkyl vinyl ether against degradation in viscosity or molecular weight upon storage for an extended period of time in aqueous solution at ambient conditions, with a single stabilizing agent, which comprises forming the acid copolymer directly from a slurry of corresponding anhydride in an organic solvent by hydrolysis in water, and adding including ethylenediamine tetraacetic acid (EDTA), or salt thereof, as the single stabilizing agent to the solution either before or after hydrolysis.