Polyurethane coated textile sheets

US3984607A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilhelm Thoma · Leverkusen, DE
• Bernd Quiring · Leverkusen, DE

Key dates

• Filing date: Jan 20, 1975
• Grant date: Oct 5, 1976
• Expiry date: Jan 20, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/259
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyurethane coated textile sheets are disclosed and a reversal process for their preparation, wherein the textile sheets are coated by means of a top coat solution with a polymer mixture comprising I. 50 to 90% by weight, based on the total polymer, of a substantially linear polyurethane which is substantially free of reactive end groups and which has been prepared by a process which comprises reacting an organic dihyroxyl compound of molecular weight 500 to 4000 and an organic diol of molecular weight 60 to 450 with an aromatic diisocyanate, Ii. 0 to 50% by weight of a vinyl copolymer, and Iii. 1 to 50% by weight of a diene graft copolymer, Said polymer mixture having been applied to a release substrate prior to said coating process.