N-alkoxymethyl (meth)acrylamide functional polymers and their use in self-crosslinkable coating compositions
First Claim
1. A method for applying a composite coating to a substrate which comprises applying to the substrate a colored film-forming composition to form a base coat and applying to said base coat a clear film-forming composition to form a transparent top coat over the base coat characterized in that the clear film-forming composition is self-crosslinkable and comprises as the main resinous component a non-gelled addition polymer which is the free radical initiated reaction product of the following polymerizable ethylenically unsaturated monomers:
- a) about 40 to 80% by weight of an N-alkoxymethyl(meth)acrylamide;
b) about 20 to 60% total by weight of at least one polymerizable ethylenically unsaturated monomer selected from the group consisting of styrene, methyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and mixtures thereof;
c) up to 10% by weight, based on total weight of the polymerizable ethylenically unsaturated monomers used in preparing the polymer, of a hydroxyl functional ethylenically unsaturated monomer selected from the group consisting of hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, and hydroxybutyl (meth)acrylate, andd) up to 5% by weight, of an acid functional ethylenically unsaturated monomer, andwhere the percentage by weight is based on total weight of the polymerizable ethylenically unsaturated monomers used in preparing the polymer.
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Abstract
Self-crosslinkable film-forming compositions and a process for preparing multi-layered coated articles coated with a pigmented or colored base coat and a transparent or clear topcoat containing a self-crosslinkable film-forming composition are disclosed. The self-crosslinkable film-forming composition comprises a non-gelled addition polymer which is the free radical initiated reaction product of an N-alkoxymethyl(meth)acrylamide and at least one other ethylenically unsaturated monomer. The topcoat composition may be aqueous based. The transparent topcoat provides a composite coating with improved acid etch resistance and mar resistance, making the composite coating particularly useful as a topcoat for automotive parts.
88 Citations
12 Claims
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1. A method for applying a composite coating to a substrate which comprises applying to the substrate a colored film-forming composition to form a base coat and applying to said base coat a clear film-forming composition to form a transparent top coat over the base coat characterized in that the clear film-forming composition is self-crosslinkable and comprises as the main resinous component a non-gelled addition polymer which is the free radical initiated reaction product of the following polymerizable ethylenically unsaturated monomers:
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a) about 40 to 80% by weight of an N-alkoxymethyl(meth)acrylamide; b) about 20 to 60% total by weight of at least one polymerizable ethylenically unsaturated monomer selected from the group consisting of styrene, methyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and mixtures thereof; c) up to 10% by weight, based on total weight of the polymerizable ethylenically unsaturated monomers used in preparing the polymer, of a hydroxyl functional ethylenically unsaturated monomer selected from the group consisting of hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, and hydroxybutyl (meth)acrylate, and d) up to 5% by weight, of an acid functional ethylenically unsaturated monomer, and where the percentage by weight is based on total weight of the polymerizable ethylenically unsaturated monomers used in preparing the polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification