Coating compositions and process for the production of polyurethane coatings

US4373081A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Nachtkamp · Cologne, DE
• Manfred Bock · Leverkusen, DE
• Gerhard Mennicken · Leverkusen, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: Nov 27, 1981
• Grant date: Feb 8, 1983
• Expiry date: Nov 27, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to thermally cross-linkable coating compositions which are liquid and stable in storage at room temperature and which contain combinations of dialkyl-malonate-blocked polyisocyanates and organic polyhydroxyl compounds as binders and, optionally, auxiliaries and additives, being characterized in that the binder comprises: PA1 (a) a polyisocyanate component containing dialkyl-malonate-blocked isocyanate groups and a content of blocked isocyanate groups, expressed as NCO, based on the weight of the polyisocyanate component excluding the weight of the blocking agent, of from about 3 to 33.6% by weight, comprising PA2 (aa) at least one dialkyl-malonate-blocked, optionally alkyl-substituted diisocyanato-diphenyl methane and/or PA2 (ab) at least one dialkyl-malonate-blocked NCO-prepolymer based on excess quantities of optionally alkyl-substituted diisocyanatodiphenyl methane and organic compounds containing at least two hydroxyl groups and PA1 (b) a polyol component having an average hydroxyl functionality of greater than 2 and a content of alcoholic hydroxyl groups of from about 1.5 to 8% by weight, comprising at least one polyester polyol in quantities corr…