Universal primer compositions and methods
First Claim
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1. A method for bonding a first substrate to a second substrate, comprising the steps of:
- a. applying to one or both of the substrates a primer composition that includes i, ii, iii, and iv as defined belowi. 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;
ii. 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;
iii. optionally, a solvent;
iv. an isocyanate functional 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; and
b. applying an adhesive to at least one of the substrates; and
c. assembling the two substrates.
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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.
26 Citations
18 Claims
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1. A method for bonding a first substrate to a second substrate, comprising the steps of:
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a. applying to one or both of the substrates a primer composition that includes i, ii, iii, and iv as defined below i. 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; ii. 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; iii. optionally, a solvent; iv. an isocyanate functional 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; and b. applying an adhesive to at least one of the substrates; and c. assembling the two substrates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for bonding a first substrate to a second substrate, comprising the steps of:
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a. applying to one or both of the substrates a primer composition that includes i, ii, iii, and iv as defined below i. 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, wherein about 1 mole of the polyisocyanate is reacted with about 2.3 to about 3 moles amino-silane, mercapto-silane, or a combination thereof to prepare the adhesion promoter; ii. 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; iii. optionally, a solvent; iv. an isocyanate functional prepolymer with an isocyanate content greater than about 1%, and being the reaction product of a polyol and an aromatic polyisocyanate; and b. applying an adhesive to at least one of the substrates and c. assembling the two substrates. - View Dependent Claims (16)
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17. A method for bonding a first substrate to a second substrate, comprising the steps of:
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a. applying to one or both of the substrates a primer composition that includes i, ii, iii, and iv as defined below i. 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—
wherein the adhesion promoter is present in an amount of about 2 to about 7 percent by weight;ii. a prepolymer derived from the reaction of at least one aliphatic polyisocyanate and a polyol, which is at least partially reacted with an active hydrogen containing moiety of an organofunctional silane, wherein the prepolymer is present in an amount of about 50 to about 65 percent by weight; iii. optionally, a solvent; iv. an isocyanate functional prepolymer with an isocyanate content greater than about 1 percent, and being the reaction product of a polyol and an aromatic polyisocyanate, wherein the isocyanate functional prepolymer is present in an amount of about 30 to about 40 percent by weight; v. a stabilizer present in an amount of about 0.1 to about 0.5 percent by weight; and vi. an acid present in an amount of about 0.01 to about 0.05 percent by weight;
based on the weight of the composition;b. applying an adhesive to at least one of the substrates and c. assembling the two substrates. - View Dependent Claims (18)
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Specification