PROCESS FOR THE PREPARATION FO BETA-MODIFICATION OF C.I PIGMENT RED 53:1
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 alpha radiation. This novel pigment form is obtained by reacting an aqueous...
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Main Authors | , , |
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Format | Patent |
Language | English Korean |
Published |
15.06.1991
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | 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 alpha radiation. This novel pigment form is obtained by reacting an aqueous solution of an alkali metal or ammonium salt of the formula 1 (1) with the equivalent amount of a water-soluble barium salt in the presence of a compound of the formula 2 (2) The modification is distinguished by a more yellowish-red shade as compared to the known alpha -modification. |
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Bibliography: | Application Number: KR19830002852 |