Aqueous coating composition

Coating processes – With post-treatment of coating or coating material – Chemical agent applied to treat coating

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106 6, 106 8, 106 10, 106230, 106238, 260 23R, 260 23XA, 260 23S, 260 27R, 260 285A, 260 285AV, 260 285B, 260 285D, 260 285R, 260 296R, 260 296MN, 260 296ME, 424 7, 428500, 427385R, B05D 304

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040716457

ABSTRACT:
The aqueous coating composition, which is particularly adaptable for use as a household floor polish or a temporary protective coating for various articles, contains a non-volatile, solid film former, such as an acrylic copolymer, dispersed in the aqueous phase or base, and a water-soluble, acid-base indicator, such as thymolphthalein, which is colored at a pH above a predetermined level and is colorless at a lower pH. Upon being applied on the surface of a substrate, a substantially colorless film is formed thereon upon the evaporation of the water and the color indicator becomes an integral part of the dried film. Upon the application of an aqueous alkaline cleaning or stripping solution having a pH above that required to effect a color change of the color indicator, (e.g., above about 11.6 when thymolphthalein is used), the film changes to a distinctive color (e.g., blue when thymolphthalein is used) so that one can readily observe whether the old film has been completely removed before the surface becomes dry.
The film former can include optional ingredients, such as a wax, an alkali-soluble resin and a permanent plasticizer to improve the wear resistance and finish properties of the resultant film. The coating composition can also include fugitive plasticizers or coalescing aids to facilitate the formation of a smooth, continuous protective film.

REFERENCES:
patent: 3467610 (1969-09-01), Fiarman et al.
patent: 3808036 (1974-04-01), Zdanowski
patent: 3933511 (1976-01-01), Heintzelman et al.

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