Thermosetting binders for cathodic deposition in electrodeposition paints

US4282128A · kind A · utility

Assignee

• Vianova Kunstharz, AG · AU

Inventors

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

Key dates

• Filing date: Dec 21, 1979
• Grant date: Aug 4, 1981
• Expiry date: Dec 21, 1999

Classification

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

Abstract

Process of producing, and binders water soluble upon neutralization with acids which are depositable at the cathode of an electrodeposition system and can be crosslinked through thermic polymerization without additional crosslinking components characterized in that (A) 1 mole of an isocyanate having the formula OCN--R--(NCO).sub.n, in which R is an aromatic, aliphatic or cycloaliphatic hydrocarbon radical and n is 1 or 2, is reacted at from 0.degree.-50.degree. C., with PA0 (a) from 0.1 to 0.5 moles, if n=1, or 0.1 to 1.0 moles, if n=2, of a tertiary dialkylalkanol amine, and subsequently with PA0 (b) from 0.5 to 0.9 moles, if n=1, or 1.0 to 1.9 moles, if n=2, of a compound carrying one free hydroxy group and 1-3 CH.sub.2 =CR.sub.1 groups, where R.sub.1 =H or CH.sub.3, and (B) the intermediate resulting from (A) carrying an average of 1 free isocyanate group is reacted at from 10.degree.-100.degree. C., with the hydroxy groups of an epoxy resin/amine adduct until an isocyanate value of 0 is obtained, the quantities between the components being chosen in order that the final product, in 1000 molecular weight units, carries at least 0.5 chain end or side chain double bonds and at lea…