Substrate coated with crater resistant acrylic enamel
AssigneeE. I. Du Pont de Nemours and Company
InventorDavid C. Chang
Life of this patent
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Abstract
A substrate of either metal or plastic which is coated with a crater resistant enamel coating composition is used for the exterior of trucks and automobiles; the binder of the coating composition is a blend of (A) an acrylic polymer having hydroxy groups and contains about 0.1-10% by weight of a polymerized perfluoro carbon constituent of the formula ##STR1## where R is H or CH.sub.3, R.sup.1 is alkyl, R.sup.2 is perfluoro alkyl and n is 0 or 1 and (B) an aminoplast crosslinking agent such as an alkylated melamine formaldehyde resin; The composition is applied and baked by conventional techniques, to form a finish on the substrate that has an excellent appearance.
Claims12
A substrate coated with a cured finish of coating composition comprising about 25-80% by weight of a binder and 20-75% by weight of an organic liquid;
- wherein the binder comprises
- (A) about 40-90% by weight, based on the weight of the binder, of an acrylic polymer having a hydroxyl content about 0.5 to 10% by weight, and consists essentially of an alkyl methacrylate having 1-18 carbon atoms in the alkyl group, an alkyl acrylate having 2-18 carbon atoms in the alkyl group, a hydroxyalkyl acrylate or a hydroxy alkyl methacrylate having 2-4 carbon atoms in the alkyl group, up to 5% by weight of an .alpha.-.beta. ethylenically unsaturated acid, and contains about 0.5-5% by weight based on the weight of the acrylic polymer, of polymerized perfluorocarbon constituent of the formula ##STR4## where R is H or CH.sub.3,
- R.sup.1 is an alkyl group containing 2-8 carbon atoms, n is 0 or 1 and
- R.sup.2 is a perfluoroalkyl group containing 4-20 carbon atoms and the polymer has a weight average molecular weight of about 2000-50,000 determined by gel permeation chromatography;
- and
- (B) about 10-60% by weight;
- based on the weight of the binder, of an alkylated melamine formaldehyde resin.
Dependencies are inferred from the claim text.