Thermosetting aqueous varnish compositions

Details Thermosetting aqueous varnish compositions Thermosetting aqueous varnish compositions

1983-03-09

1984-05-22

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524253, 524257, 524558, 524510, 524512, C08K 518

Patent

active

044502516

ABSTRACT:
Aqueous thermosetting varnish compositions that are particularly water resistant after curing are disclosed. These compositions contain by weight (A) about 20-40 percent of a solution copolymer polymerized from monomers consisting essentially of (a) about 50-75 percent vinyl ester of a C.sub.1 -C.sub.3 carboxylic acid, (b) about 10-45 percent of C.sub.1 -C.sub.8 alkyl acrylate or methacrylate ester and (c) about 5-15 percent of a mixture of (i) at least about 0.5 percent monoethylenically unsaturated C.sub.3 -C.sub.5 carboxylic acid and (ii) at least about 2 percent C.sub.2 -C.sub.4 hydroxyalkyl acrylate or methacrylate. The copolymer is polymerized at a temperature of at least 110.degree. C. and at a non-volatile solids content of 60-80 percent. Also present in the varnish are (B) about 35-55 percent water, (C) about 7-15 percent water-miscible organic solvent, (D) about 7-15 percent cross-linking agent, and (E) an amount of a volatile amine sufficient to disperse the copolymer in the vehicle provided by the water and water miscible organic solvent.

REFERENCES:
patent: 3208963 (1965-09-01), Jasinski
patent: 4098746 (1978-07-01), Becker et al.

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