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US 9,102,785 B2Granted
Curable compositions based on polyuretidiones, polythiols and photoactivable bases and generation of isocyanates from uretidiones
AssigneePPG Industries Ohio, Inc.
InventorsJonathan T. Martz, Deborah E. Hayes, Debra L. Singer
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Abstract
Curable compositions based on polyuretidiones, polythiols and photoactivable bases are disclosed. Also a process for generating isocyanate groups by exposing uretidiones to radiation in the range of 100-315 nm is disclosed. The process can be used in a dual curing system for curing compositions that comprise groups that under go photoinduced polymerizations and active hydrogen groups that react with the generated isocyanates.
Claims19
A curable composition comprising
- (a) a polyuretidione that contains from 5 to 45% by weight of uretidione groups;
- 10 to 55% by weight of urethane groups;
- and less than 2% by weight of isocyanate groups, the percentages by weight being based on total weight of uretidione, urethane and isocyanate groups;
- (b) a polythiol;
- and
- (c) a photoactivable nitrogen containing base.
3 more elements
Dependencies are inferred from the claim text.