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:
Jun. 02, 1998
Filed:
Oct. 01, 1996
Joseph T Valko, Pittsburgh, PA (US);
Philippe Faucher, Paris, FR;
Richard F Karabin, Ruffs Dale, PA (US);
Thomas C Moriarity, Wexford, PA (US);
V Eswarakrishnan, Allison Park, PA (US);
Ellor J Van Buskirk, Wexford, PA (US);
Gregory J McCollum, Gibsonia, PA (US);
Raphael O Kollah, Pittsburgh, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
An electrodepositable composition is provided comprising: (A) a non-gelled cationic resin which is derived from a polyepoxide and which contains in the resin molecule cationic salt groups and active hydrogen groups selected from aliphatic hydroxyl and primary and secondary amino; and present as a separate component (B) a fully capped polyisocyanate curing agent containing substantially no free isocyanate groups. The electrodepositable composition contains from about 0.02 to 1.0 milliequivalents phenolic hydroxyl groups per gram of resin solids, and from about 0.1 to 2.0 milliequivalents beta-hydroxy ester groups per gram of resin solids. The composition provides excellent corrosion resistance when electrodeposited over steel substrates, and does not require lead in the formulation nor the use of a conventional chrome rinse for the steel substrate pretreatment before electrodeposition.