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Abstract

Described herein is a primer composition which comprises a solution or dispersion of: (a) about 2 percent to about 30 percent by weight of a film-forming resin; (b) about 2 percent to about 80 percent by weight of a reaction product of an epoxy silane and an amino silane, wherein the amino silane contains at least two amine groups per molecule, which is prepared by (1) contacting an amino silane and epoxy silane in amounts such that the molar ratio of epoxy silane to amino silane in the reaction mixture is less than about 1.8:1.0 and then (2) adding additional epoxy silane to the reaction mixture so that the molar ratio of epoxy silane to amino silane is at least about 2:1 in a volatile solvent. Described herein is also a method of bonding a vehicle window to a vehicle window flange using the primer composition and a urethane adhesive. It has been discovered that the primer of the invention enhances the bonding of a non-porous substrate, such as glass, to a second substrate, particularly when used in conjunction with a 'fast cure' adhesive comprised of an isocyanate-functional prepolymer and dimorpholinodiethyl ether. In addition, such primers are more easily prepared than primers which require the use of a silane 'cook' comprising a reaction product of a polyisocyanate and one or more silane-containing compounds.

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First Claim