Thermoplastic polyurethane elastomers with a low degree of organic carbon migration

US5247049A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Groll · Schifferstadt, DE
• Wolfgang Straehle · Heidelberg, DE
• Herbert Mueller · Herznach, CH

Key dates

• Filing date: Sep 28, 1992
• Grant date: Sep 21, 1993
• Expiry date: Sep 28, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/6674
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to thermoplastic polyurethane elastomers obtainable by reaction of PA0 a) unmodified and/or modified organic polyisocyanates, preferably 4,4'-diisocyanatodiphenylmethane, with PA0 b) polyoxybutylene glycols and/or polyoxybutylene/polyoxyalkylene glycols with a molecular weight of from 150 to 1800 and a content of crown ethers, preferably those of the formula (--CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 O--).sub.m, where m is from 3 to 6, not exceeding 0.06% of the total weight and PA0 c) chain extenders with a molecular weight of from 60 to 400, preferably 1,4-butanediol, to a process for the preparation thereof and to the use thereof for producing molded articles and sheets for use in the medical or hygiene sector and in the foodstuffs sector.