Radiation curable thermoplastic polyurethanes

Details Radiation curable thermoplastic polyurethanes Radiation curable thermoplastic polyurethanes

1989-10-10

1992-03-24

Kight, III, John

Boot and shoe making

528 44, 528 75, 528 82, 528289, 528546, 528406, 528513, 528521, 172349, C08J 9224, C08G 1830, C08G 5902

Patent

active

050989820

ABSTRACT:
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.

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