Universal primer compositions and methods

The composition of claim 21, wherein the primer composition further includes i) diethylmalonate that is present in an amount up to about 2% by weight of the primer composition, ii) a phosphoric acid that is present in an amount less than about 0.2% by weight of the primer composition, or both i) and ii);

• a film former, a colorant, or a combination thereof, an further wherein in the primer composition, i) the base primer is present in an amount of about 50 to about 65% by weight;
• ii) the adhesion promoter is present in an amount of about 2 to about 7% by weight;
• iii) the isocyanate functional prepolymer with an isocyanate content greater than about 1% will be present in an amount of about 30 to about 40% by weight;
• iv) diethylmalonate is present in an amount of about 0.1 to about 0.5% by weight;
• v) acid is present in an amount of about 0.01 to about 0.05 by weight;
• or vi) any combination of i) through v).

A primer composition that includes

• 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,
• 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;
• and
• optionally, a solvent;
• 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:
• and
• the composition exhibits i) a solids content in the range of about 30 to about 50;
• ii) an isocyanate content of about 1 to about 7%,
• iii) a density of about 0.92 to about 0.95 g/cm3,
• iv) a silane content of about 1 to about 5%, or
• v) any combination of i) through iv).

An additive for a primer composition comprising i) an adhesion promoter that is a reaction product of an organofunctional silane and an aromatic isocyanate;

• and
• ii) a second reaction product that is an isocyanate functional prepolymer with an isocyanate content greater than about 1% formed by the reaction of a polyol having a functionality of greater than about 2 and a molecular weight (Mn) greater than about 300 and an aromatic isocyanate;
• wherein a primer composition containing the additive when used as a primer with an adhesive on a substrate exhibits 100 percent cohesive failure in an adhesion peel test after aging for 7 days at room temperature;
• and further aging using one or more of the following time periods and conditions;
• a) 7 days of water immersion;
• b) 7 days at 90° C.;
• c) 7 additional of cataplasma cycling;
• and d) 14 days cataplasma cycling.