C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
402/154, 260/317
C07D 207/452 (2006.01) C07D 209/02 (2006.01) C08G 18/28 (2006.01) C08G 18/67 (2006.01) C08G 18/68 (2006.01) C08J 3/28 (2006.01)
Patent
CA 2027115
ABSTRACT OF THE DISCLOSURE Radiation curable linear thermoplastic polyurethanes having imido pendent groups of the formula (A) Image (A) wherein Z is an unsaturated C2-12 hydrocarbyl or substituted hydrocarbyl group (preferably H3CC=CCH3) 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 C2-12 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 thermo- plastic 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.
Swabey Ogilvy Renault
The B.f. Goodrich Company
LandOfFree
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