Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1993-05-24
1994-12-06
Lusignan, Michael
Coating processes
With post-treatment of coating or coating material
Heating or drying
4284228, 4284231, 528 45, 528 67, 528 73, B05D 302
Patent
active
053709080
ABSTRACT:
The present invention relates to a process for coating a substrate which comprises (a) contacting said substrate with a low volatility organic (so-called "low VOC") coating composition having a viscosity as measured by ZAHN cup 2 of less than about 200 seconds and consisting essentially of at least one polyisocyanate, a solvent in an amount of between 0% and 45% by weight based upon the amount of said polyisocyanate in said composition, and an trimerization catalyst, said composition being essentially free of any volatile mono- and di-isocyanates, to form a coating on said substrate, and (b) heating said coating to a curing temperature of between 120.degree. F. and 350.degree. F. for a curing time of between about ten minutes and about six hours in order to cure said coating by trimerizing at least some of the isocyanate groups of the polyisocyanate to provide a heat-cured coating on said substrate. Also claimed is the coating composition itself.
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Chandalia Kiran B.
Malofsky Adam G.
O'Connor James M.
Stuber Fred A.
Carlson Dale Lynn
Lusignan Michael
Olin Corporation
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