Baking finishes of low solvent content

Details Baking finishes of low solvent content Baking finishes of low solvent content

1978-09-06

1980-02-26

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 328EP, 260 332EP, 260 334EP, C08K 505

Patent

active

041905695

ABSTRACT:
The invention relates to baking finishes of low solvent content, consisting essentially of an acrylate resin, an eposy resin and a mixture of organic solvents, with or without pigment, catalyst and other conventional auxiliaries, in which the acrylate resin is a copolymer which contains from 10 to 35% by weight of .alpha.,.beta.-olefinically unsaturated carboxylic acids as copolymerized units, has a very low K value and has an acid number of from 70 to 250 mg of KOH/g, the epoxy resin contains at least 2 oxirane groups per molecule and the mixture of organic solvents is a mixture of from 20 to 80% by weight of a solvent having a boiling point of from 100.degree. to 280.degree. C. and a dielectric constant of from 2 to 4.99, and from 80 to 20% by weight of a solvent having a boiling point of from 80.degree. to 200.degree. C. and a dielectric constant of from 5 to 27. The weight ratio of acrylate resin to epoxy resin is from 9:1 to 6:4.
The acrylate resin has a mean molecular weight Mn of from 1500 to 3000 and an inhomogeneity (Mw/Mn), measured by gel permeation chromatography, of from 1.5 to 2.0.
These baking finishes of low solvent content may be used, e.g., as finishes for domestic equipment and as automotive primers.

REFERENCES:
patent: 3065195 (1962-11-01), Vasta
patent: 3940353 (1976-02-01), Martorano

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