ADHESION-PROMOTING AGENT FOR PROTECTIVE COATINGS
First Claim
1. A substrate coated by a dried and cured layer of a polyurea coating composition wherein the polyurea coating composition comprises an adhesion-promoting agent that is the reaction product of a polyisocyanate having, on average, at least 2.5 isocyanate groups per molecule and an isocyanate-reactive compound having at least 1 silicon-containing functional group.
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Accused Products
Abstract
The present invention relates to an adhesion-promoting agent that contains at least 1.5 isocyanate groups per molecule and at least one urea linked silane group, coating compositions containing the adhesion promoting agent and methods for adhering protected coatings to a substrate. The adhesion-promoting agent is especially useful as an additive to the crosslinking component of a two component coating composition. The coating composition is especially useful for use as a protective coating on a previously coated or uncoated substrate such as an automobile.
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Citations
21 Claims
- 1. A substrate coated by a dried and cured layer of a polyurea coating composition wherein the polyurea coating composition comprises an adhesion-promoting agent that is the reaction product of a polyisocyanate having, on average, at least 2.5 isocyanate groups per molecule and an isocyanate-reactive compound having at least 1 silicon-containing functional group.
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7. A polyurea coating composition comprising
A) a crosslinkable component consisting essentially of compounds, oligomers and/or polymers that have amine functional groups; - and
B) a crosslinking component comprising isocyanate functional compounds, oligomers and/or polymers; wherein said crosslinking component includes an adhesion-promoting agent comprising the reaction product of a polyisocyanate and a isocyanate-reactive compound having at least 1 silicon-containing functional group. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16)
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15. The polyurea coating composition of claim 8 wherein the ratio of isocyanate groups in said crosslinking component to amine groups in said crosslinkable component is in the range of from 1:
- 0.5 up to 1;
2.
- 0.5 up to 1;
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17. A method of adhering a protective coating to a coated substrate, wherein the coated substrate comprises a previously dried and cured coating layer, said method comprising the steps of:
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a. applying a polyurea coating composition to the coated substrate, wherein the polyurea coating composition comprises an adhesion-promoting agent that is the reaction product of (1) a polyisocyanate having, on average, at least 2.5 isocyanate groups per molecule with (2) an isocyanate-reactive compound having at least 1 silicon-containing functional group; b. curing the applied polyurea coating composition. - View Dependent Claims (18, 19, 20, 21)
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Specification