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Low VOC, heat-curable, one-component and two-component coating compositions based on organic polyisocyanates

  • US 5,370,908 A
  • Filed: 05/24/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 05/24/1993
  • Status: Expired due to Fees
First Claim
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1. A process for coating a substrate which comprises:

  • (a) contacting said substrate with a low volatile organic compounds-containing 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 having an average functionality of between 2.5 and 6 and containing at least one moiety selected from the group consisting of biuret, isocyanurate, uretidione, allophanate, urethane, and combinations thereof, a solvent in an amount of between 0% and 45% by weight based upon the amount of said polyisocyanate in said composition, and a 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°

    F. and about 350°

    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 isocyanate groups of said polyisocyanate to provide a heat-cured coating on said substrate.

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