Coating composition
AssigneeBerger, Jenson & Nicholson Limited
InventorWilliam T. Elliott
Life of this patent
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Abstract
Pigmented coating compositions having improved opacity and film strength comprise an aqueous latex of film-forming resin binder, a non-solvent for the resin binder of sufficiently low volatility to produce, upon first removing water from a film of the coating composition and secondly removing said non-solvent, a continuous non-porous microcellular film having minute discrete substantially closed voids, non-film-forming granules of a polymer which is not dissolved by the non-solvent, and pigment and/or extender, which may be present in the latex or the non-solvent or the polymer granules. The polymer granules may be spheroidal beads or aggregates. The non-solvent and the polymer granules alleged to act synergistically to improve the opacity of the paint.
Claims10
A coating composition comprising:
- (a) an aqueous latex of film-forming resin binder
- (b) finely dispersed therein, from 0.05 to 3 parts, per part by weight of the film-forming resin binder, of a non-solvent for the film-forming binder of sufficiently low volatility to produce, on first removing water from the latex and secondly removing said non-solvent, a continuous non-porous microcellular film having minute discrete closed voids, and
- (c) non-film-forming granules of a weight average particle size in the range of 5 to 60 microns of a polymer which is not dissolved by water or by the non-solvent, present in an amount of from 5 to 75% by volume of the non-volatile content of the composition.
Dependencies are inferred from the claim text.