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.
Claims9
A process for generating isocyanate groups comprising exposing a material containing at least one uretidione group to ultraviolet radiation in the range of 100-315 nm.
A process for curing a composition by a plurality of curing mechanisms comprising:
- a providing a composition comprising groups
- i that undergo photoinduced free radical polymerization or photoinduced cationic polymerization,
- ii at least one uretidione group, and
- iii at least one active hydrogen group;
- b exposing the composition to ultraviolet radiation in the range of 100-315 nm so as to polymerize the groups of (i) and generating isocyanate groups from the uretidione group, which react with the active hydrogen groups, the exposure resulting in a cured composition.
Dependencies are inferred from the claim text.