Process for making dustless, readily-dispensible pigment granule

Details Process for making dustless, readily-dispensible pigment granule Process for making dustless, readily-dispensible pigment granule

1978-03-24

1980-03-11

McCarthy, Helen M.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Agitating to form larger particles

106 22, 106 26, 106 32, 106288Q, 106308C, 106308N, 106309, C09B 6700, C09C 158

Patent

active

041928415

ABSTRACT:
A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, and an aniline which is liquid at temperature below 100.degree. C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, the pH value being first above 7, maintaining the temperature above the melting point of the aniline and reducing the pH to below 7 to render the aniline compound soluble in water, and recovering the resulting granules in a solvent free condition.

REFERENCES:
patent: 2822337 (1958-02-01), Evans
patent: 4001035 (1977-01-01), Ito et al.
patent: 4015999 (1977-04-01), Robertson et al.
patent: 4036652 (1977-07-01), Rothmayer
patent: 4055439 (1977-10-01), Babler
Kirk-Othmer, Encyclopedia of Chem. Tech., vol. 2 (1964), pp. 416, 418-419, 600; Suppl. vol., (1972), pp. 888-889, 896.

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