Azo pigments derived from 2-hydroxynaphthalene-3-carboxylic acid

Details Azo pigments derived from 2-hydroxynaphthalene-3-carboxylic acid Azo pigments derived from 2-hydroxynaphthalene-3-carboxylic acid

1982-09-01

1985-07-23

Higel, Floyd D.

Compositions: coating or plastic

Materials or ingredients

106308Q, 106309, 534841, 534842, 534845, 534874, 534882, C09B 2901, C09B 2915, C06P 144

Patent

active

045307245

ABSTRACT:
The color of azo pigments derived from 2-hydroxynaphthalene-3-carboxylic acid or its salts are improved by the coupling reaction of a diazonium compound of an aromatic aminosulfonic acid with a coupling component which is a mixture of (1) 2-hydroxynaphthalene-3-carboxylic acid or its salt, (2) .beta.-naphthol or its salt, and (3) a phenolic by-product having a molecular weight of about 300 and containing about 1 equivalent of phenolic hydroxy groups. The phenolic by-product can be obtained by evaporating .beta.-naphthol from a tarry substance formed as a by-product during the reaction of an alkali .beta.-naphtholate with carbon dioxide, extracting the residue with an alkali and precipitating the soluble matter with an acid. The color or tone of the azo pigment is stabilized by the use of the coupling component. The azo pigments range from those having dark color and a greater degree of transparency which are suitable for use in printing inks to those having increased brightness which are suitable for use in paints.

REFERENCES:
patent: 350229 (1886-10-01), Bender
patent: 743071 (1903-11-01), Gley et al.
patent: 1025267 (1912-05-01), Heidenreich
patent: 2189806 (1940-02-01), Lang et al.
patent: 2229049 (1941-01-01), Dahlen et al.
patent: 2694056 (1954-11-01), Ludwig et al.
patent: 2796415 (1957-06-01), Ludwig et al.
patent: 4224221 (1980-09-01), Burley et al.

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