Process for the production of new polyisocyanate compositions and their use for the production of plastics by the isocyanate polyaddition process

US4732960A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Rasshofer · Kürten, DE
• Reiner Paul · Frankenthal (Pfalz), DE
• Joachim Probst · Leverkusen, DE

Key dates

• Filing date: Jan 15, 1986
• Grant date: Mar 22, 1988
• Expiry date: Jan 15, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2120/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of polyisocyanate compositions containing urethane groups and having an isocyanate content of about 0.5 to 45% by weight by the reaction of PA1 (a) an organic polyisocyanate or mixtures thereof having an isocyanate content of about 30 to 50% by weight with PA1 (b) organic polyhydroxyl compounds using an equivalent ratio of isocyanate groups to hydroxyl groups of at least 1.8:1, characterized in that the polyhydroxyl compounds (b) are based on PA1 (b1) polyhydroxypolyacrylates having an average molecular weight, determined by vapor pressure osmometry, of 232 to about 100,000 which optionally contain urethane or ester groups in side chains, and a statistical average of at least one alcoholic hydroxyl group per molecule PA1 (b2) optionally in admixture with up to about 250% by weight, based on (b1), of other polyhydroxyl compounds in the molecular weight range of 62 to about 12,000. The invention also relates to the polyisocyanate compositions obtainable by this process and their use as components for the production of polyurethanes or polyurethane ureas.