Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1989-03-28
1990-04-24
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
534575, 534583, 534739, 534839, 534863, 534876, 534887, C09B 2938, C09B 3508, C09B 3700, C09B 4100
Patent
active
049202057
ABSTRACT:
Azo pigments are made by subjecting a diazo component to an azo coupling reaction with the equivalent quantity of a coupling component difficultly soluble at less than 65.degree. C. in the aqueous/acid and aqueous
etural pH-ranges. More specifically, an aqueous/alkaline solution of the coupling component is continuously mixed in a first reaction step with an aqueous solution of acetic acid, boric acid, phosphoric acid, hydrochloric acid or sulfuric acid at a temperature lower than 65.degree. C. within a period of less than 1 minute, during which the coupling component commenences precipitating at least partially as reactive matter; next, the suspension obtained is continuously mixed, in a second reaction step immediately following the first reaction step, with an aqueous/acid solution of the diazo component at a temperature of less than 65.degree. C. within a period of less than 1 minute, and a predetermined pH between 2 and 9 is established by controlling the flow of the mass streams of diazo component and coupling component whereby a portion of the coupling component is caused to undergo immediate reaction to the azo pigment to be made; the balance portion of the coupling component is ultimately reacted in a postreaction phase with unreacted diazo component to the azo pigment to be made.
Behringer Hartmut
Rehberg Heinrich
Higel Floyd D.
Hoechst Aktiengesellschaft
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