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    • 6. 发明授权
    • Radiation curable thermoplastic polyurethanes
    • 辐射可固化热塑性聚氨酯
    • US5098982A
    • 1992-03-24
    • US419236
    • 1989-10-10
    • Carl J. Long, II
    • Carl J. Long, II
    • C07D207/452C08G18/50C08G18/67C08G18/68
    • C08G18/678C08G18/683
    • Radiation curable linear thermoplastic polyurethanes having imido pendent groups of the formula (A) ##STR1## wherein Z is an unsaturated C.sub.2-12 hydrocarbyl or substituted hydrocarbyl group (preferably H.sub.3 CC.dbd.CCH.sub.3) capable of undergoing photocrosslinking with another like group Z, are prepared by reaction of (a) a macroglycol of molecular weight 500-7,000, (b) one or more glycol chain extenders each having a molecular weight less than 500, which may include one or more low molecular weight aliphatic glycols (e.g., a C.sub.2-12 alkylene glycol or mixture thereof), and (c) an organic diisocyanate. Either a macroglycol or a chain extender must include a radiation sensitive pendent imido group of the above formula (A). The thermoplastic polyurethanes herein have hard and soft segments. Pendent groups (A) are present in the hard segments when a chain extender containing pendent group (A) is used, and are present in the soft segment when a macroglycol having pendent group (A) is used. The thermoplastic polyurethanes are useful for various purposes including coatings and magnetic recording media. Radiation curing gives a thermoset polyurethane having high hardness and good solvent resistance.