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:
Mar. 21, 1995
Filed:
Mar. 07, 1994
Rajeev Farwaha, Brampton, CA;
William Currie, Elmira, CA;
National Starch and Chemical Investment Holding Corporation, Wilmington, DE (US);
Abstract
Copolymerizable amphoteric surfactants of the structural formula ##STR1## in which R.sub.1 =C.sub.1 -C.sub.2 alkyl, R.sub.2 =C.sub.1 -C.sub.2 alkyl, X.sup.- =SO.sub.3.sup.- or COO.sup.-, a=2-3, and b=1-6, are polymerized into copolymer latexes for use in paint formulations, in an amount of 1-3 parts per hundred parts by weight of monomers used to form the copolymer, to impart superior wet adhesion and freeze-thaw stability to the latex paints. The copolymer latexes contain no more than one part by weight carboxylic acid functionality per hundred part monomers. The monomers with which the amphoteric surfactants are copolymerized are selected from alkyl esters of acrylic and methacrylic acid, acrylic and methacrylic acid, styrene and mixtures thereof.