C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/73 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/65 (2006.01)
Patent
CA 2650701
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(.beta.-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.
Broich Markus
Peerlings Henricus
Shafiq Faisal
Bayer Materialscience Ag
Fetherstonhaugh & Co.
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