Solution of a polyurethane in a polyol and a process for using such a solution in the production of polyurethane plastics

US4371630A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Konig · Leverkusen, DE
• Hans-Walter Illger · Rösrath, DE
• Peter Seifert · Wittlich, DE
• Holger Meyborg · Odenthal, DE

Key dates

• Filing date: Feb 23, 1981
• Grant date: Feb 1, 1983
• Expiry date: Feb 23, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/914
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A solution of a polyurethane in a polyol is made from (a) the reaction product of a polyisocyanate and a diprimary diol, and (b) a polyether in which the reaction product constitutes from 3 to 60 wt. % of the solution. Suitable diprimary diols have a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the general formula: ##STR1## in which R.sub.1 represents chlorine, an alkyl, cycloalkyl, aralkyl or aryl radical having from 1 to 10 carbon atoms, which carbon atoms may be substituted or interrupted by chlorine, ester groups, ether groups, amide groups, urethane groups or nitrile groups, and PA1 R.sub.2 represents hydrogen or a radical within the definition of R.sub.1. Polyethers which may be employed have at least two hydroxyl groups (at least 80% of which are secondary hydroxyl groups) and an average molecular weight of from 500 to 12,000. The disclosed solutions are particularly useful in the production of flexible polyurethane plastics which are suitable for flamecoating and high frequency bonding.