Dialysis monitored preparation of metal salts of azo pigments

Details Dialysis monitored preparation of metal salts of azo pigments Dialysis monitored preparation of metal salts of azo pigments

1977-10-28

1980-02-26

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 106309, 260141, 260144, 260146R, 260149, 260151, 260208, C09B 4514, C09B 4516, C09B 4518, C09B 4520

Patent

active

041905784

ABSTRACT:
Azo dyestuff coupling process in which the amount of excess diazo or coupling component is continuously monitored and the addition of diazo component or coupling component to the reaction is automatically controlled by means of an automatic chemical analyzer which incorporates a dialyzer module, which process is characterized in that azo metal salt pigments derived from sulphonated intermediates can be obtained by precipitating the pigment by adding a water-soluble metal salt to the water-soluble sulphonated azo dyestuff at some stage prior to the passage of the sample stream through the dialyzer.

REFERENCES:
patent: 3344131 (1967-09-01), Uehlinger
patent: 3522231 (1970-07-01), Bitterlin
patent: 3526617 (1970-09-01), Fuchs et al.
patent: 3939141 (1976-02-01), Meininger et al.

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