The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 1989
Filed:
Apr. 14, 1987
Glenn E Martin, Farmington Hills, MI (US);
Timothy D Salatin, Bloomfield Hills, MI (US);
Vincent C Cook, Madison Heights, MI (US);
BASF Corporation, Clifton, NJ (US);
Abstract
A high solids, stable, nonaqueous dispersion, comprising a low Tg copolymer, having a Tg between about -10.degree. C. and about 30.degree. C., particularly adapted for use as a clear coat automotive finish. The copolymer is the copolymerization product of monomers whose Tg is above about 50.degree. C., polar monomers whose Tg is up to about 15.degree. C. and .alpha., .beta. ethylenically unsaturated stabilizer copolymers. The stabilizer copolymers are formed from .alpha., .beta. ethylenically unsaturated monomers and at least one oxirane containing compound and have a molecular weight of about 2,000 to about 25,000, are soluble in aliphatic solvents and have a Tg of about -60.degree. C. to about 0.degree. C. These nonaqueous dispersions result in coatings having high % solids, ease of application, minimal sagging and good gloss and DOI. They are preferably made by copolymerizing ethylenically unsaturated monomers with about 0.5% to about 4% acid functional chain transfer agents and reacting the thus formed copolymer with about 1% to about 4% oxirane containing .alpha., .beta. ethylenically unsaturated monomers to modify the copolymer resulting in a stabilizer copolymer. The nonaqueous dispersion is made by a free radical copolymerization of the monomers whose Tg is above about 50.degree. C., polar monomers whose Tg is up to about 15.degree. C., and the stabilizer copolymers in a nonpolar solvent at reflux temperatures.