Process for preparing high-hiding gamma-modification of unsubsti

Details Process for preparing high-hiding gamma-modification of unsubsti Process for preparing high-hiding gamma-modification of unsubsti

1986-11-13

1988-07-19

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106504, 106503, 106497, C09B 4800

Patent

active

047586656

ABSTRACT:
A process for preparing the high-hiding form of the .gamma.-crystal modification of unsubstituted linear transquinacridone having improved tinctorial strength and producing a coating of higher gloss, which comprises carrying out (a) the known cyclization of 2,5-diphenylaminoterephthalic acid in highly concentrated polyphosphoric acid or in acid polyphosphoric acid ester to the quinacridone and/or (b) the known hydrolysis of the quinacridone melt obtained in (a) and/or (c) the known aqueous alkali extraction of the quinacridone obtained in (b) and/or (d) the known finishing of the quinacridone obtained in (a) in the presence of 0.5 to 10 percent by weight, based on quinacridone, of surface-active agents.

REFERENCES:
patent: 2821529 (1958-01-01), Struve
patent: 2844581 (1958-07-01), Manger et al.
patent: 4094699 (1978-06-01), Fitzgerald
patent: 4247695 (1981-01-01), Fitzgerald
patent: 4298398 (1981-11-01), Fitzgerald
Kuramoto, et al., Chemical Abstracts, vol. 92, 216,822s, (1980).

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