Patent ID: 6191263
Filing Date: 2001-02-20
Classification: C09B,Y02A

Abstract:
A C.I. Pigment Red 53:2 of the formula (I) ##STR4##in which M is a cation, with the proviso that at least 50% of the cations are calcium ions,in the .gamma.-modification, which has the following characteristic reflections in the X-ray powder diffraction pattern, measured using Cu-K.sub..alpha. radiation:.gamma.: 2.THETA. d Relative intensity in % 4.4 20.2 49 5.8 15.4 100 8.8 10.0 23 10.3 8.6 25 10.9 8.1 33 12.2 7.3 15 13.9 6.4 16 15.4 5.8 15 16.7 5.3 28 17.6 5.0 16 18.4 4.8 18 18.6 4.8 18 19.7 4.5 20 20.8 4.3 18 23.2 3.8 48 24.0 3.7 21 24.8 3.6 37 25.2 3.5 34 26.6 3.3 19 27.3 3.3 19 27.9 3.2 12 29.3 3.0 14