Method of producing color stable thermoplastic polyurethanes...

Details Method of producing color stable thermoplastic polyurethanes... Method of producing color stable thermoplastic polyurethanes...

C - Chemistry, Metallurgy

08

G

402/133

C08G 18/42 (2006.01) C08G 18/66 (2006.01)

Patent

CA 1134987

Mo-1750-JG PU-052-A METHOD OF PRODUCING COLOR STABLE THERMOPLASTIC POLYURETHANES AND PRODUCTS MADE THEREBY ABSTRACT OF THE DISCLOSURE The instant invention is directed to a novel method for improving the color stability of thermoplastic polyurethanes and the polyurethanes produced thereby. The invention broadly consists of adding relatively small amounts of a specified hydroxyl group containing additive to the thermoplastic polyurethane reaction mixture. The additive may be added before, or during production of the thermoplastic polyurethane. In general the additive is defined as: (a) having a molecular weight of 400 or less, and (b) containing from 2 to 4 aliphatic hydroxyl groups, with at least 2 of the hydroxyl groups being vicinal, and with the vicinal hydroxyl groups being primary and/or secondary. PU-052-A

306593

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