Process for preparation of yellow shade modification of gamma qu

Details Process for preparation of yellow shade modification of gamma qu Process for preparation of yellow shade modification of gamma qu

1986-11-13

1988-07-26

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106497, C09B 4800

Patent

active

047601442

ABSTRACT:
Process for preparing yellow shade modification of gamma quinacridone whereby the .gamma..sub.II form is converted to the .gamma..sub.I form (1) by milling in an alcohol and in the presence of a base or (2) by premilling the .gamma..sub.II form to the .gamma..sub.I form and then refluxing or milling the resulting .gamma..sub.I form in an alcohol in the presence of a base, the resulting product being a highly crystalline, bright, yellow shade, ready dispersable .gamma..sub.I quinacridone pigment.

REFERENCES:
patent: 3074950 (1963-01-01), Deuschel et al.
patent: 3547925 (1970-12-01), Wagener
patent: 3726873 (1973-04-01), Hashizume et al.
patent: 3892751 (1975-07-01), Tyson et al.
patent: 4024148 (1977-05-01), Tyson et al.
patent: 4298398 (1981-11-01), Fitzgerald
patent: 4455173 (1984-06-01), Jaffe
patent: 4541872 (1985-09-01), Jaffe
Labana, et al., Chemical Reviews, vol. 67, No. 1, pp. 8-11, 15-17, Jan. 25, 1967.

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