Process for preparing pigmentary quinacridone in predetermined c

Details Process for preparing pigmentary quinacridone in predetermined c Process for preparing pigmentary quinacridone in predetermined c

1975-11-21

1977-04-12

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, C09B 4800

Patent

active

040174964

ABSTRACT:
Process for preparing pigmentary quinacridone in the .alpha.-, .beta.-, and .gamma.-form by vacuum evaporating crude quinacridone at an elevated temperature from 400.degree. C. to 550.degree. C. at from 10.sup..sup.-3 mmHg to 10.sup..sup.-5 mmHg, rapidly condensing the evaporated crude quinacridone to form an amorphous condensate and contacting the amorphous condensate with o-dichlorobenzene or dimethylformamide to form pigmentary quinacridone. This process eliminates the need for acid pasting, salt milling, and solvent milling conventionally used to produce pigmentary quinacridone.

REFERENCES:
patent: 2844581 (1958-07-01), Manger et al.
patent: 3020279 (1962-02-01), Woodlock et al.
patent: 3272821 (1966-09-01), Schweizer
Chung et al., Chemical Abstracts, vol. 76 18970v, (1972).

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