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Universal primer compositions and methods

  • US 8,298,368 B2
  • Filed: 05/20/2011
  • Issued: 10/30/2012
  • Est. Priority Date: 04/24/2007
  • Status: Active Grant
First Claim
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1. A primer composition that includes a, b, c, and d as defined below;

  • a. an adhesion promoter, which is an adduct prepared by the reaction of at least one aromatic polyisocyanate compound, with an active hydrogen containing moiety of an organofunctional silane;

    b. a prepolymer derived from the reaction of at least one aliphatic polyisocyanate and a polyol, and is at least partially reacted with an active hydrogen containing moiety of an organofunctional silane;

    c. a solvent; and

    d. an isocyanate function prepolymer with an isocyanate content greater than about 1%, and being the reaction product of a polyol and an aromatic polyisocyanate wherein the polyol has a functionality of greater than about 2 and a molecular weight (Mn) greater than about 300;

    wherein the adhesion promoter is present in a weight ratio of about 1;

    100 to about 2;

    1 parts adhesion promoter to aliphatic isocyanate prepolymer.

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