Universal primer compositions and methods
AssigneeDow Global Technologies LLC
InventorsStefan Schmatloch, Dirk Schwôeppe
Life of this patent
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Abstract
A composition for and method for bonding a substrate. In general, applied to a substrate will be 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, and 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.
Claims21
1-12. (canceled)
A kit comprising a primer composition and at least one adhesive wherein the primer includes the reaction product of i) a first reaction product of at least one isocyanate including a thiophosphate and a silane selected from an amino-silane, a mercapto-silane, or a combination thereof;
- and ii) a second reaction product that is an isocyanate functional prepolymer with an isocyanate content greater than about 1% generally 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.
An additive for a primer composition comprising the reaction product of i) a first reaction product of at least one isocyanate including a thiophosphate and a silane selected from an amino-silane, a mercapto-silane, or a combination thereof;
- and ii) a second reaction product that is an isocyanate functional prepolymer with an isocyanate content greater than about 1% generally 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.
A method of improving the performance of a primer composition, comprising the step of mixing an additive in an amount of about 1 to about 20 parts by weight to about 99 to about 80 parts by weight of the primer composition, wherein the additive includes the reaction product of i) a first reaction product of at least one isocyanate including a thiophosphate and a silane selected from an amino-silane, a mercapto-silane, or a combination thereof;
- and ii) a second reaction product that is an isocyanate functional prepolymer with an isocyanate content greater than about 1% generally 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;
- with a base primer composition to form a resulting primer composition;
- and contacting a substrate selected from glass, metal, plastic, a coated substrate, or any combination thereof, with the resulting primer composition.
A composition comprising a product of a reaction of i) an additive that includes the reaction product of a) a first reaction product of at least one isocyanate including a thiophosphate and a silane selected from an amino-silane, a mercapto-silane, or a combination thereof;
- and b) a second reaction product that is an isocyanate functional prepolymer with an isocyanate content greater than about 1%, which is a reaction product of a polyol having a functionality of greater than about 2 and a molecular weight (Mn) greater than about 300 and an aromatic isocyanate;
- ii) with at least one base primer composition that includes a prepolymer derived from the reaction of at least one aliphatic polyisocyanate and a polyol, and is at least partially reacted with an amino group of an aminosilane, wherein the aminosilane includes a plurality of alkoxy groups bound to silicon.
Dependencies are inferred from the claim text.