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. 27, 1995
Filed:
Jun. 28, 1994
Stephen C Peng, Shelby Township, MI (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
An improved aqueous cathodic electrocoating composition of an aqueous carrier having dispersed therein a film forming binder of (1) an epoxy resin-amine adduct and (2) a blocked polyisocyanate crosslinking agent; wherein the improvement is the use of a branched epoxy resin to form the adduct which is the reaction product of a polyhydric phenol and a branched epoxy macromonomer formed by the self condensation of an epoxy resin in the presence of a catalyst; the branched epoxy resin has an epoxy equivalent weight of about 700-2,000 and provides an electrocoating composition that has improved throw power and that forms coatings that have improved corrosion resistance in comparison to conventional electrocoating compositions formed from linear epoxy resins.