Non-bleeding indicators and dyes therefor used in pH determinati

Details Non-bleeding indicators and dyes therefor used in pH determinati Non-bleeding indicators and dyes therefor used in pH determinati

1975-08-06

1977-06-14

McCamish, Marion E.

Compositions

Nonreactive analytical, testing, or indicating compositions

23253TP, 260200, 428411, G01N 3100, G01N 3300

Patent

active

040295974

ABSTRACT:
In colorimetric indicators comprising a carrier such as cellulose saturated with one or more azo dyes having reactive groups capable of forming a chemical bond with the carrier material, the improvement wherein the indicator is made non-bleeding by using such dyes which, in addition to the reactive group, contain at least one additional sulfonic acid and/or carboxylic acid group, an example of such a dye being 4-anilino-3'-(2-hydroxysulfonyloxyethylsulfonyl)-azobenzene-6'-carboxylic acid.

REFERENCES:
patent: 2806023 (1957-09-01), Wenker
patent: 3202652 (1965-08-01), Meininger

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