Binders for use in cathodic electrodeposition coatings, process for their preparation and cathodic electrodeposition coating compositions containing same

US6372108B1 · kind B1 · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Helmut Hoenig · Kumberg, AT
• Roland Feola · Graz, AT
• Johann Gmoser · Graz, AT
• Robert Thausz · Graz, AT

Key dates

• Filing date: May 16, 2000
• Grant date: Apr 16, 2002
• Expiry date: May 16, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D163/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Novel alkaline polymeric binders, preferably amino epoxy binders, for use in cathodic electrodeposition coatings have a number average molecular mass of 1000 to 3000, an amine value of 150 to 250 mg KOH/g binder and 50 to 230 milliequivalents/100 g binder of beta-hydroxyalkyl urethane groups of the formula HOCnH2nOC(O)NH— where n=2 to 3, as well as processes for making such binders; aqueous compositions, particularly cathodic electrodeposition compositions containing such binders (which provide improved throwing power); and process of using such compositions, particularly on automotive bodies and parts thereof, are disclosed.