Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-04-14
1989-04-04
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525910, 525911, 525912, 525913, 525925, 524531, C08F26702, C08F26706, C08L 5106
Patent
active
048187925
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.
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Cook Vincent C.
Martin Glenn E.
Salatin Timothy D.
BASF Corporation
Olson A. Dean
Seccuro Carman J.
Skula Emil R.
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