Patent · US Expired

Process for preparing copper phthalocyanine pigments of the .alpha.-modification

US4224222A · kind A · utility

7Cited by

7References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Ernst Spietschka · Idstein, DE
Siegfried Schiessler · Frankfurt am Main, DE
Wolfgang Tronich

Key dates

Filing date	Oct 20, 1978
Grant date	Sep 23, 1980
Priority date	—
Expiry date	Oct 20, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B67/0026
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

This invention relates to a process for the preparation of a very pure copper phthalocyanine pigment of the .alpha.-modification which comprises dissolving crude copper phthalocyanine in a 80 to 86% sulfuric acid isolating the copper phthalocyanine sulfate formed, hydrolizing the sulfate and grinding the copper phthalocyanine thus obtained in an aqueous-organic medium.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.