Process for the preparation of opaque diketopyrrolo-pyrrole pigm

Details Process for the preparation of opaque diketopyrrolo-pyrrole pigm Process for the preparation of opaque diketopyrrolo-pyrrole pigm

1989-09-19

1991-02-12

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C08K 53415

Patent

active

049921010

ABSTRACT:
Process for the preparation of opaque 1,4-diketopyrrolo-[3,4-c]pyrroles of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is hydrogen, halogen or C.sub.1 -C.sub.4 -alkyl and other is hydrogen, which process essentially consists of milling the pigment in an alcohol and in the presence of a base at a temperature below 50.degree. C., the resulting product being a highly crystalline readily dispersable diketopyrrolopyrrole pigment having outstanding color strength, purity of shade and saturation.

REFERENCES:
patent: 4259488 (1981-03-01), Von Der Crone
patent: 4541872 (1985-09-01), Jaffe
patent: 4579949 (1986-04-01), Rochat et al.
patent: 4632704 (1986-12-01), Babler
patent: 4720305 (1988-01-01), Iqbal et al.
patent: 4760144 (1988-07-01), Jaffee

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