Process for the preparation of prepolymers containing isocyanate groups, the prepolymers obtainable by this process and their use as binders in one-component lacquers

US4801675A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Josef Pedain · Cologne, DE
• Michael Sonntag · Odenthal, DE
• Klaus Konig · Leverkusen, DE

Key dates

• Filing date: Jun 10, 1987
• Grant date: Jan 31, 1989
• Expiry date: Jun 10, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/664
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is directed to a process for the preparation of prepolymers containing free isocyanate groups and having an isocyanate content of 1 to 16% by weight by the reaction of PA0 (a) a polyisocyanate component with PA0 (b) a polyhydroxyl component based on (i) at least one polyester polyol having a hydroxyl functionality (average) of about 1.8 to 5 and a hydroxyl number (average) of from 15 to 300 or (ii) mixtures of polyester polyols of the type mentioned under (i) with up to about 10% by weight, based on the weight of the mixture, of (cyclo)alkane polyols having a hydroxyl number above about 300 and optionally containing ester groups at an NCO/OH equivalent ratio above 2:1, characterized in that the compounds used as component (a) contain triisocyanato-isocyanurates having aliphatically or cycloaliphatically bound isocyanate groups. The present invention also relates to the prepolymers with free isocyanate groups obtainable by this process and their use as binders for moisture hardening one-component lacquers.