Thermoplastic polyurethanes for processing in extruders and/or on calenders

US4371684A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Bernd Quiring · Leverkusen, DE
• Georg Niederdellmann · Dormagen, DE
• Wilhelm Goyert · Leverkusen, DE
• Hans Wagner · Dormagen, DE

Key dates

• Filing date: May 29, 1981
• Grant date: Feb 1, 1983
• Expiry date: May 29, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/61
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is directed to a process extruding or melt roll calendering thermoplastic polyurethanes wherein the polyurethanes used are synthesized from p1 (a) one or more relatively high molecular weight substantially linear polyols having molecular weights in the range from 400 to 10,000 PA1 (b) diphenyl methane and/or hexamethylene diisocyanate and PA1 (c) a mixture of 85 to 99% by weight of 1,4-butane diol and 1 to 15% by weight of at least one co-extender selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, diethylene 1,2-propane diol, 1,3-butane diol, 1,6-hexane diol, 2-ethyl-1,3-hexane diol, 2,2-dimethyl-1,3-propane diol, 1,4-bis-hydroxymethyl cyclohexane, hydroquinone-bis-hydroxyethyl ether, and mixtures thereof, the equivalent ratio of NCO groups in component (B) to the Zerewitinoff-active hydrogen atoms in components (A) and (C) being from 0.9:1 to 1.2:1 and the molar ratio of component (A) to (C) being from 1:20 to 5:1.