Impregnation and primer coating of absorptive substrates with pl

Details Impregnation and primer coating of absorptive substrates with pl Impregnation and primer coating of absorptive substrates with pl

1976-07-15

1978-05-16

Gwinnell, Harry J.

Coating processes

With post-treatment of coating or coating material

Heating or drying

260 296T, 260 296TA, 260 296H, 260 296PT, 260 296PM, 427385C, 427390R, 427407R, 427412, 428304, B05D 726, B32B 326

Patent

active

040899993

ABSTRACT:
Absorptive substrates, such as asbestos cement, concrete plaster work, can be impregnated to lock the pores and to consolidate the substrate, especially old and weathered plaster work, with aqueous plastics dispersions, if dispersions are used which have an average particle size of about 0.02 to at most 0.1.mu.m, and preferably from 0.036 to 0.080.mu.m. As opposed to conventional dispersions with larger particle sizes, the penetration of dispersions according to the invention reaches the same values as that of the solvent-based impregnating and priming compositions hitherto used. Aqueous dispersions are easier to handle and permit relatively high solids contents at a moderate viscosity.

REFERENCES:
patent: 3238056 (1966-03-01), Pall et al.
patent: 3265124 (1966-08-01), Reys
patent: 3432339 (1969-03-01), Howell et al.
Lontz et al., "Teflon . . . Dispersion", Ind. & Eng. Chem., vol. 44, No. 8, pp. 1800-1805 (1952).

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