.beta.-modified crystalline red pigment

Details .beta.-modified crystalline red pigment .beta.-modified crystalline red pigment

1983-06-23

1988-01-12

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

106 22, 106 23, 106208, 106308Q, 106289, 534588, 534602, 534882, C09B 6724, C09B 6748, C09B 1102, D06P 144

Patent

active

047192925

ABSTRACT:
A novel crystallographic modification (.beta.-modification) of the pigment C. I. Pigment Red 53:1 is described and claimed which has characteristic reflection values in its X-ray diffraction pattern obtained by means of Cu-K.sub..alpha. radiation. This novel pigment form is obtained by reacting an aqueous solution of an alkali metal or ammonium salt of the formula 1 ##STR1## with the equivalent amount of a water-soluble barium salt in the presence of a compound of the formula 2 ##STR2## The modification is distinguished by a more yellowish-red shade as compared to the known .alpha.-modification.

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