Colored primer compositions and methods

1. A method for bonding a transparent substrate within an opening of a structure, comprising the steps of:

a. applying to a transparent substrate a primer composition that includes a colorant and at least one isocyanate functional prepolymer derived from the reaction of an aliphatic polyisocyanate and a polyether polyol wherein the prepolymer is at least partially reacted with the active hydrogen of an organofunctional silane;

b. applying an adhesive to the structure defining the opening or to the primer composition on the transparent substrate; and

c. installing the transparent substrate within the opening, wherein the resulting installed substrate is free of any ceramic enamel.

2. The method of claim 1 , wherein the step (a) includes a step of applying a silanated compound to the transparent substrate prior to applying the primer composition that includes the colorant.

3. The method of claim 2 , wherein the structure defining the opening is part of an automotive vehicle having a predetermined color, the colorant includes titanium dioxide, iron oxide, cerium oxide, carbon black, a phthalocyanine, an anthraquinone, a perylene, a carbazole, a monoazo- or disazobenzimidazolone, an isoindolinone, a monoazonaphthol, a diarylidepyrazolone, a rhodamine, an indigoid, a quinacridone, a diazopyranthrone, a dinitraniline, a pyrazolone, a dianisidine, a pyranthrone, a tetrachloroisoindolinone, a dioxazine, a monoazoacrylide, an anthrapyrimidine or any mixture thereof, or both.

4. The method of claim 3 , wherein the at least one isocyanate functional prepolymer is at least partially reacted with an amino group of a secondary aminosilane that includes a plurality of alkoxy groups bound to one or more silicon atoms.

5. The method of claim 4 , wherein the colorant is present in an amount up to about 15 percent by weight of the overall primer composition.

6. The method of claim 1 , wherein the at least one isocyanate functional prepolymer is derived from the reaction of an aliphatic polyisocyanate and a polyether polyol, at least partially reacted with an amino group of a secondary aminosilane, wherein the secondary aminosilane includes a two or three methoxy groups bound to silicon, two or three ethoxy groups bound to silicon, or a combination thereof.

7. The method of claim 1 wherein the primer composition further comprises an adhesion promoter comprising a reaction product of an organofucntional silane and an aromatic isocyanate containing a thiophosphate group.

8. The method of claim 3 wherein the colorant includes carbon black.