Powder lacquer and its use for coating heat-resistant substrates

US4900800A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Reinhard Halpaap · Odenthal, DE
• Josef Pedain · Cologne, DE
• Hans-Joachim Kreuder · Krefeld, DE
• Gerhard Klein · Monheim, DE
• Walter Schafer · Leichlingen, DE
• Dieter Arlt · Cologne, DE

Key dates

• Filing date: Jul 15, 1987
• Grant date: Feb 13, 1990
• Expiry date: Jul 15, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a powder lacquer containing a mixture of PA0 (A) a polyisocyanate component in power form which is solid below about 40.degree. C. and liquid above about 150.degree. C. and PA0 (B) a organic polyhydroxyl component in powder form which is solid below about 40.degree. C. and liquid above about 150.degree. C., components (A) and (B) being present in quantities corresponding to an equivalent ratio of isocyanate groups to hydroxyl groups of about 0.6:1 to 1.2:1, characterized in that component (A) is based on a polyisocyanate or polyisocyanate mixture which PA0 (a) does not contain any blocking agents for isocyanate groups, PA0 (b) has a content of free isocyanate groups (expressed as NCO) attached to tertiary, aliphatic or cycloaliphatic carbon atoms of about 8 to 24% by weight and an average NCO functionality of at least 2.1, PA0 (c) has a urethane group content (expressed as --NH--CO--O--) of about 3 to 30% by weight and PA0 (d) has an isocyanurate group content (expressed as C.sub.3 N.sub.3 O.sub.3) of 0 to about 30% by weight. The present invention also relates to the use of this powder lacquer for the production of coatings on heat-resistant substr…