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Multi-layer coating composition incorporating migratory catalyst

  • US 5,578,346 A
  • Filed: 06/07/1995
  • Issued: 11/26/1996
  • Est. Priority Date: 11/24/1993
  • Status: Expired due to Term
First Claim
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1. A process for coating a substrate with a multi-layer decorative and/or protective coating which process comprises:

  • (a) applying to the substrate at least one first coat which is substantially free of isocyanate functionality and which comprises;

    (i) a film-forming composition capable of curing or drying; and

    (ii) a catalyst for the reaction of isocyanate groups and active hydrogen groups; and

    (b) applying to the first coat, prior to the complete cure of said first coat a second coat which is substantially free of any catalyst for the reaction of isocyanate groups and active hydrogen groups, and which second coat comprises;

    (i) an active hydrogen functional compound; and

    (ii) a polyisocyanate;

    whereby upon application of said second coat onto the catalyst containing first coat, a reaction between the polyisocyanate and the active hydrogen functional compound of the second coat is catalyzed.

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