Process for the production of urethane-modified polyisocyanate using an oxyalkylated bisphenol

US4581388A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Rasshofer · Kürten, DE
• Richard Kopp · Cologne, DE
• Reiner Paul · Frankenthal (Pfalz), DE
• Klaus Seel · Cologne, DE
• Otto Ganster · Odenthal, DE

Key dates

• Filing date: Jan 7, 1985
• Grant date: Apr 8, 1986
• Expiry date: Jan 7, 2005

Classification

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

Abstract

Urethane-modified polyisocyanates having an NCO-content of from 5 to 45 wt. % are made by reacting an organic polyisocyanate or mixture of polyisocyanates having an NCO-content of from 30 to 50 wt. % with an organic polyhydroxyl compound or mixtures of polyhydroxyl compounds. The organic polyhydroxyl compound must include at least 10 hydroxyl equivalent percent of an alkoxylation product of a bisphenol corresponding to a specified formula containing two alcoholic hydroxyl groups and having an OH number of from 112 to 389. The reactants are employed in quantities such that the NCO:OH equivalent ratio is from 2:1 to 50:1. The urethane-modified polyisocyanates of the present invention are particularly useful in the production of polyurethanes by the isocyanate polyaddition process.