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:
Sep. 02, 1997
Filed:
Mar. 14, 1996
Applicant:
Inventors:
Robert L Simeone, Pittsburgh, PA (US);
Robert D Lippert, Butler, PA (US);
James B O'Dwyer, Valencia, PA (US);
Charles M Kania, Natrona Heights, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08L / ;
U.S. Cl.
CPC ...
5253273 ; 525165 ;
Abstract
A powder coating composition comprises (a) from 60-90 percent by weight of an epoxy functional copolymer having a Tg of from 25.degree.-70.degree. C. formed by polymerizing from 50-75 percent by weight of a glycidyl functional monomer and from 35-50 percent by weight of a monomer free of glycidyl functionality, and (b) from 10-40 percent by weight of a polycarboxylic acid crosslinking agent, wherein the ratio of epoxy:acid functionality is about 1:0.8 to 1.