Method for dispersing optical brighteners in waterborne coating

Compositions: coating or plastic – Coating or plastic compositions – Wax containing

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4273855, C08J 302

Patent

active

057626987

ABSTRACT:
This invention provides a method for rendering a water-based coating (i.e., one which contains essentially no organic solvent) fluorescent. Also provided is a method for measuring the extent of coverage and thickness of a water-based coating by incorporating therein a minor amount of an emulsion of an insoluble compound which absorbs ultraviolet light and fluoresces strongly in the visible region of the spectrum, so that the intensity of the fluorescence serves as an indication of the degree of coverage and thickness of the film. Also provided is a method for enhancing the apparent brightness of a film pigmented with light colored pigments. In the case where white pigments such as titanium dioxide are used, the effect is to increase the apparent whiteness of the film.

REFERENCES:
patent: 4741860 (1988-05-01), Hartman

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