Water vapor permeable thermoplastic polyurethane film

US6790926B1 · kind B1 · utility

Assignee

• SYMPATEX TECHNOLOGIES GMBH · DE

Inventors

• Jozef Spijkers · Stiens, NL
• Hendricus J. M. Van De Ven · Arnhem, NL
• Thomas Mezger · Zell am Harmersbach, DE
• Dirk Bontinck · Ertvelde, BE
• Luc De Koninck · Brussels, BE

Key dates

• Filing date: Jun 20, 2001
• Grant date: Sep 14, 2004
• Expiry date: Jun 20, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S528/904
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Claimed is a non-porous, waterproof film having a water vapor permeability of at least 1000 g/m2 day, based on a thermoplastic polyurethane, wherein the polyurethane is composed ofa) 40 to 52 wt. % of polyether glycol having an atomic ratio of carbon to oxygen in the range of 2,0 to 4,3, with at least 30 wt. % of the polyurethane being composed of a polyether glycol having an atomic ratio of carbon to oxygen in the range of 2,0 to 2,4,b) 30 to 45 wt. % of polyisocyanate, calculated as 4,4′-diphenyl methane diisocyanate,c) 0,5 to 10 wt. % of araliphatic diol, andd) 5 to 20 wt. % of low-molecular weight chain extender, calculated as 1,4-butane diol, less the amount of araliphatic diol.Also claimed is the use of these films in rainwear, shoes, tents, seats, as mattress covers, as understating, in garments for medical purposes, and for the manufacture thereof of wound dressings.