Low-solvent, thermosetting reactive polyurethane coating composition, a process for its production and its use in direct and reverse coating processes

US4446293A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eberhard Konig · Kronberg, DE
• Wilhelm Thoma · Leverkusen, DE
• Josef Pedain · Cologne, DE
• Klaus Konig · Leverkusen, DE

Key dates

• Filing date: May 14, 1982
• Grant date: May 1, 1984
• Expiry date: May 14, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/44
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to low-solvent, thermosetting reactive polyurethane coating compositions which are particularly resistant to light, oxidation and hydrolysis, do not crystallize or harden and comprise the following components: PA0 (A) a ketoxime-blocked NCO-prepolymer of PA1 1. 1 mole of 2- to 4-functional, relatively high molecular weight polyhydroxyl compounds comprising a polyester polycarbonate based on ester glycols of .epsilon.-caprolactone and 1,6-hexane diol; PA1 2. about 0.1 to 1.2 moles of low molecular weight polyols containing bis-carbazinic ester polyols corresponding to the following general formula ##STR1## in which R is a straight-chain and/or branched C.sub.1 -C.sub.5 -alkylene or hydroxyl-substituted alkylene radical, and low molecular weight diols and triols preferably containing tertiary amino groups, and PA1 3. aliphatic and/or cycloaliphatic diisocyanates in an NCO/OH ratio of from about 1.5:1 to 6:1 and PA1 4. ketoximes; PA0 (B) aliphatic and/or cycloaliphatic polyamines containing at least two primary amino groups and PA0 (C) up to about 40% by weight of organic solvents. The invention also relates to a process for producing the low-solvent reactive coa…