Self-crosslinking resin emulsions for cathodically depositable coating compositions

US4174332A · kind A · utility

Assignee

• Vianova Kunstharz, AG · AU

Inventors

• Helmut Honig · Geretsried, DE
• Georgios Pampouchidis · Graz, AT

Key dates

• Filing date: Feb 2, 1978
• Grant date: Nov 13, 1979
• Expiry date: Feb 2, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S524/901
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Aqueous emulsions of binders for cathodically depositable aqueous coating compositions comprising emulsions of (A) 98 to 50 percent by weight of at least one water-soluble self-crosslinking cationic resin which is water-dilutable upon partial or total neutralization with an inorganic or organic acid and having at least 0.5 basic nitrogen atoms in 1000 molecular weight units and a double bond number of at least 0.5; and (B) 2 to 50 percent by weight of a water-insoluble self-crosslinking polycondensation resin or polymerization resin having a double bond number of at least 0.8. Optionally, the water-insoluble self-crosslinking resin can include basic character but insufficient to provide water solubility. The emulsions have excellent stability without use of other emulsifiers even in substantially diluted form usual for electrodeposition baths. The emulsions when used in coating compositions provide films which have good adhesion characteristics, cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion.