Transparent thermoplastic polyurethanes having low haze and good processability, methods of making the same, and uses therefor

US8497341B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Henricus Peerlings · Solingen, DE
• Faisal Shafiq · Kaarst, DE
• Markus Broich · Hückelhoven, DE

Key dates

• Filing date: Jan 23, 2009
• Grant date: Jul 30, 2013
• Expiry date: Jan 4, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/73
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Light-stable, thermoplastic polyurethanes with good processability and having an ASTM D-1003 haze value of less than 10%, the polyurethane prepared by a process comprising: reacting: (a) a diisocyanate component comprising 1,6-hexamethylene diisocyanate; (b) a chain extension component consisting of (b1) 1,4-di(β-hydroxyethyl)hydroquinone and (b2) at least one chain extender selected from the group consisting of diols having a 2 or 3 carbon atom chain length between the two OH groups, in a molar ratio of chain extender (b1) to chain extender (b2) of 10:1 to 1:4; and (c) at least one polyol component having a number average molecular weight of 450 to 10000 g/mol, and an average number of Zerewitinoff-active hydrogen atoms of at least 1.8 to at most 3.0; wherein the ratio of isocyanate groups in component (a) to isocyanate-reactive groups in components (b) and (c) is 0.9:1 to 1.1:1.