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. 10, 1990
Filed:
Sep. 29, 1987
Rudolf Maska, Pittsburgh, PA (US);
William A Essary, Freeport, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
Disclosed is an aqueous composition of low viscosity and low volatile organic solvent content of a water-borne resin. The water-borne resin comprises: (I) from 10 to 50 percent by weight of a polyester polymer, and (II) from 90 to 50 percent by weight of a solution polymerized acrylic copolymer. The solution polymerized acrylic copolymer is derived from a mixture of monomers comprising an ethylenically unsaturated carboxylic acid monomer. The water-borne resin is at least partially neutralized by a base and, prior to neutralization, has an acid value based on resin solids of from 10 to 200. Also disclosed is a method for preparing the aqueous composition which comprises: (A) addition polymerizing in solution a first monomer composition containing from 1 percent to 15 percent by weight of an epoxy-functional vinyl monomer and from 99 percent to 85 percent by weight of at least one other copolymerizable vinyl monomer in the presence of a polyester polymer having an acid value on solids of from 10 to 85 and a weight average molecular weight of from 500 to 2,000 until the epoxy functionality of the epoxy-functional vinyl monomer has been essentially completely reacted, to form a first product (1), and thereafter, (B) addition polymerizing in the aforesaid first product (1), a second monomer composition containing from 3 to 50 percent by weight, based on the total weight of vinyl monomers from parts (A) and (B), of an ethylenically unsaturated carboxylic acid and at least one other copolymerizable vinyl monomer different from the epoxy-functional vinyl monomer, to form a second product (2), and thereafter, (C) dispersing the aforesaid product (2) in water utilizing a base.