Production of pigments

Details Production of pigments Production of pigments

1991-02-21

1992-04-07

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

534575, 534588, 106 22, 106 23, 106402, C04B 1100, C09B 1102

Patent

active

051024667

ABSTRACT:
The present invention provides a process for the production of a metallized azo pigment having the formula ##STR1## in which R and R.sub.1, independently, are hydrogen, halogen or alkyl; X.sub.1 is SO.sub.3.sup..crclbar. or CO.sub.2.sup..crclbar. ; and M is Ca, Sr, Mn or Ba; comprising coupling, at a pH value below 7.0, a diazotized amine of formula ##STR2## in which R, R.sub.1 and X.sub.1 have their previous significance, with a coupling component of formula ##STR3## to produce an azo dyestuff having the formula ##STR4## in which R, R.sub.1 and X.sub.1 have their previous significance, and Y is an alkaline earth metal or ammonium ion; and laking the dyestuff of formula IV during or after its production with one or more salts of a metal M wherein M has its previous significance.
Also disclosed is a new modification of a pigment of formula I.

REFERENCES:
patent: 4655844 (1987-04-01), Ueno et al.
patent: 4719292 (1988-01-01), Schui et al.
patent: 4734489 (1988-03-01), Kawasaki et al.
CA: 93:73767k, Paul Guenthert, Dyeing of thermoplastic materials, May 8, 1980, 12 pages.
CA, 137932k, Dobrovolny, Monoazo lacquers, Oct. 15, 1972, 4 pages.

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