Compositions – Nonreactive analytical – testing – or indicating compositions
Patent
1969-03-14
1977-06-14
McCamish, Marion E.
Compositions
Nonreactive analytical, testing, or indicating compositions
23230B, 23230R, 23253TP, 260148, 260200, G01N 3100, G01N 3300
Patent
active
040295982
ABSTRACT:
In 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: 2202652 (1965-08-01), Meininger
patent: 2806023 (1957-09-01), Wenker
patent: 2915373 (1959-12-01), Wenker
patent: 3510469 (1970-05-01), Sugiyama
patent: 3515716 (1970-06-01), Sugiyama
Bohnert, "The Journal of the Society of Dyers and Colourists," Jan. 1960, pp. 581-585.
Baumer Wilhelm
Neisius Karlheinz
E. Merck A. G.
McCamish Marion E.
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