Thermosetting coating compositions and process for the coating of substrates

US4248756A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eberhard Konig · Kronberg, DE
• Josef Pedain · Cologne, DE
• Hans-Joachim Koch · Glatten, DE

Key dates

• Filing date: Jan 10, 1980
• Grant date: Feb 3, 1981
• Expiry date: Jan 10, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to thermosetting two-component coating compositions containing PA1 (A) a prepolymer having an average molecular weight of from 1,000 to 15,000 having an average of from 2 to 4 ketoxime-blocked aromatic isocyanate groups; PA1 (B) a crosslinking agent corresponding to the following general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen or C.sub.1 - to C.sub.3 -alkyl groups with the proviso that if R.sup.1 to R.sup.4 all are hydrogen, 75% of the diamine have the cis,cis-structure and optionally PA1 (C) pigments, fillers blowing agents or other known additives. The equivalent ratio of blocked isocyanate groups to NH.sub.2 groups is from about 1.35:1 to about 0.95:1, and the coating composition contains not more than about 15% by weight of organic solvents and is free from aqueous polymer dispersions or solutions. The coating compositions may be applied to substrates by the direct or reverse process and may be applied as a top coat, adhesive coat or foam coat.