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专利名称：Method for improving the resistance to
yellowing of polyurethanes
发明人：Heiss, Herbert L.申请号：EP78100667申请日：19780816公开号：EP0001057A3公开日：19790530
摘要：The instant invention is directed to a novel method for improving the colorstability of thermoplastic polyurethanes and the polyurethanes produced thereby. Theinvention broadly consists of adding relatively small amounts of a specified hydroxylgroup containing additive to the thermoplastic polyurethane reaction mixture. Theadditive 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 groupsbeing vicinal, and with the vicinal hydroxyl groups being primary and/or secondary.
申请人：Mobay Chemical Corporation
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