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Coating composition of hydroxy functional acrylic polymer, polyol and polyisocyanate crosslinking agent
| Details |
Inventors: Anderson, Richard D.; Lamb, Douglas M.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Reddick; Judy M.
Assistant Examiner:
Attorney, Agent or Firm: Fricke; Hilmar L.
A coating composition primarily used as a clear coat of a clearcoat/color coat automotive finish; the composition has a film forming binder solids content of about 30-70% by weight contains about (A) 50-80% by weight, based on the weight of the binder, of a hydroxy functional acrylic polymer of polymerized monomers of styrene, alkyl methacrylate monomers and hydroxy alkyl methacrylate or acrylate each having 1-4 carbon atoms in the alkyl group, an ethylenic unsaturated carboxylic acid at least partically reacted with a glycidyl ester of a carboxylic acid and the polymer has a number average molecular weight of about 1,000-12,000 and (B) 1-20% by weight, based on the weight of the binder, of a polyol component and (C) 10-49% by weight, based on the weight of the binder, of an organic polyisocyanate. |
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DETAILED DESCRIPTION We claim: 1.
A clear coating composition having a film forming binder solids content of about 30-70% by weight and organic solvent,wherein the binder contains (A) 50-80% by weight, based on the weight of the binder, of a hydroxy functional acrylic polymer consisting essentially of polymerized monomers of styrene, an alkyl methacrylate having 1-4 carbon atoms in the alkyl group, a hydroxy alkyl methacrylate or hydroxy alkyl acrylate each having 1-4 carbon atoms in the alkyl group, an ethylenically unsaturated carboxylic acid reacted with a glycidyl ester of carboxylic acid; wherein the acrylic polymer has a number average molecular weight of about 1,000-12,000 determined by gel permeation chromatography; (B) 1-20% by weight, based on the weight of the binder, of a polyol component having the formula of ##STR5## wherein: R.
sup.
1 is a covalent bond or alkylene group containing 1, 2, 3 or 4 carbon atoms; n is 1to 4; m is 2, 3 or 4; and Q is a saturated carbocyclic ring containing 5 or 6 carbon atoms, or S--R.
sup.
2 --T wherein S and T are each independently saturated carbocyclic rings containing 5 or 6 carbon atoms, and R.
sup.
2 is a covalent bond or an alkylene group containing 1, 2 or 3 carbon atoms; provided that no more than one R.
sup.
1 is bound to any carbocyclic carbon atom, and further provided that when Q is S--R.
sup.
2 --T, each R.
sup.
1 is bound to a carbon atom of the carbocyclic rings of S and T and (C) 10-49% by weight, based on the weight of the binder, of an organic polyisocyanate.
2.
The coating composition of claim 1 in which the glycidyl ester of carboxylic acid has the formula ##STR6## where R.
sup.
3 is a tertiary aliphatic hydrocarbon of 8-10 carbon atoms.
3.
The coating composition of claim 2 in which the acrylic polymer consists essentially of about 10-50% by weight styrene, 5-20% by weight of methyl methacrylate, 10-40% by weight of hydroxy alkyl methacrylate, 2-10% weight of acrylic acid or methacrylic acid that has been reacted with the glycidyl ester
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