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US 4,220,679 AGranted
Coating process
AssigneeImperial Chemical Industries PLC
InventorAlan J. Backhouse
Life of this patent
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Abstract
A multilayer coating is produced by applying to a substrate as a base-coat composition a pigmented solution in a volatile organic liquid of a film-forming polymer, the solution also containing specified polymer microparticles, forming a polymer film from the base-coat composition, then applying to the film so obtained a transparent top-coat composition and finally forming a second polymer film upon the base-coat film.
Claims11
A process for the production of a multilayer protective and/or decorative coating upon the surface of a substrate, which comprises the steps of:
- (1) applying to the surface a base-coat composition comprising:
- (A) a film-forming polymer;
- (B) a volatile organic liquid diluent in which the polymer is dissolved;
- (C) polymer microparticles of diameter 0.01 to 10 microns which are insoluble in the solution of the polymer (A) in the liquid diluent (B) and are stably dispersed therein in a non-flocculated state by means of a steric barrier around the particles of polymer chains which are solvated by the said solution, in an amount of at least 10% of the aggregate weight of the film-forming polymer and the microparticles;
- (D) pigment particles also dispersed in the solution of the film-forming polymer in the liquid diluent;
- (2) forming a polymer film upon the surface from the composition applied in step (1);
- (3) applying to the base-coat film so obtained a transparent top-coat composition comprising:
- (E) a film-forming polymer;
- (F) a volatile carrier liquid for the polymer;
- (4) forming a second polymer film upon the base-coat film from the composition applied in step (3).
7 more elements
Dependencies are inferred from the claim text.