Method of improving adhesive of durable coatings on weathered substrates
First Claim
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1. A method for improving adhesion and gloss of a coating on a weathered substrate, wherein the improvement comprises:
- applying on said substrate a film of a latex binder comprising an aqueous evaporable carrier maintained at a pH of 8.5 to 9.5 and having dispersed therein a latex polymer bearing an acid functional pendant moiety and enamine functional pendant moiety wherein said enamine functional pendant moiety results from the reaction of an acetoacetyl functional pendant moiety on said latex polymer with ammonia or amine, said polymer having a peak molecular weight in the range of 10,000 to 200,000, and an acid number in the range of 1 to 70;
evaporating said aqueous evaporable carrier from said film; and
exposing said film to actinic light and air to cure said film into said coating on said weathered substrate having improved adhesion.
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Abstract
A latex binder suitable for producing high gloss coating on weathered substrates and a method for producing such coatings. The binder includes a low molecular weight and low acid number latex polymer having an acid functional and an enamine functional moiety that results from the reaction of ammonia or amine with an acetoacetyl functional pendant moiety on the latex polymer. A film containing the latex binder is applied on a substrate and then exposed to ambient light and air to produce a high gloss highly adherent film on difficult to adhere surfaces, such as weathered chalky substrates.
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8 Claims
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1. A method for improving adhesion and gloss of a coating on a weathered substrate, wherein the improvement comprises:
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applying on said substrate a film of a latex binder comprising an aqueous evaporable carrier maintained at a pH of 8.5 to 9.5 and having dispersed therein a latex polymer bearing an acid functional pendant moiety and enamine functional pendant moiety wherein said enamine functional pendant moiety results from the reaction of an acetoacetyl functional pendant moiety on said latex polymer with ammonia or amine, said polymer having a peak molecular weight in the range of 10,000 to 200,000, and an acid number in the range of 1 to 70; evaporating said aqueous evaporable carrier from said film; and exposing said film to actinic light and air to cure said film into said coating on said weathered substrate having improved adhesion. - View Dependent Claims (2)
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3. A method for improving adhesion and gloss of a coating on a weathered substrate, wherein the improvement comprises:
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applying on said substrate a film of a latex binder comprising an aqueous evaporable carrier having dispersed therein a latex polymer bearing an acid functional pendant moiety and enamine functional pendant moiety wherein said enamine functional pendant moiety results from the reaction of an acetoacetyl functional pendant moiety on said latex polymer with ammonia or amine, said polymer having a peak molecular weight in the range of 10,000 to 200,000, and an acid number in the range of 1 to 70; evaporating said aqueous evaporable carrier from said film; and exposing said film to actinic light and air to cure said film into said coating on said weathered substrate having improved adhesion and gloss. - View Dependent Claims (4, 5, 6)
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7. A method for improving adhesion and gloss of a coating on a weathered substrate, wherein the improvement comprises:
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applying on said substrate a film of a latex polymer comprising an aqueous evaporable carrier having dispersed therein a blend of a first polymer bearing an acid functional pendant moiety and a second polymer having an enamine functional pendant moiety wherein said enamine functional pendant moiety results from the reaction of an acetoacetyl functional pendant moiety on said second polymer with ammonia or amine, said latex polymer having a peak molecular weight in the range of 10,000 to 200,000, and an acid number in the range of 1 to 70; evaporating said aqueous evaporable carrier from said film; and exposing said film to actinic light and air to cure said film into said coating on said weathered substrate. - View Dependent Claims (8)
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Specification