Process for the preparation of polyurethane plastics using dianhydro-hexite diols

USRE33748E · kind E · reissue

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Holger Meyborg · Odenthal, DE
• Kuno Wagner · Leverkusen, DE
• James-Michael Barnes · Breitscheid, DE
• Herbert Salzburg · Leichlingen, DE

Key dates

• Filing date: May 10, 1985
• Grant date: Nov 19, 1991
• Expiry date: May 10, 2005

Classification

• Technology area (CPC —): General

Abstract

A process for the preparation of homogeneous and cellular polyurethane plastics by the reaction of PA1 (a) organic polyisocyanates; PA1 (b) compounds containing at least 2 Zerewitinoff-active hydrogen atoms and having molecular weights of from 400 to 10,000; PA1 (c) chain extenders, and, optionally, additional PA1 (d) short-chained compounds containing at least 2 Zerewitinoff-active hydrogen atoms and having a molar mass of from 32 to 400, as well as, optionally, PA1 (e) catalysts, blowing agents and other known additives, is described, which is characterized in that 1,4-3,6-dianhydro-hexites, preferably 1,4-3,6-dianhydro-D-sorbitol and/or 1,4-3,6-dianhydro-D-mannitol, optionally mixed with lower molecular weight compounds, preferably with polyols having a molecular weight of from 62 to 400, particularly preferably butane diol-1,4 are used as the chain extenders. The new chain extenders produce high quality elastomers and foams.