Patent · US Expired

Preparation of dihydroquinacridones, quinacridones and quinacridonequinones

US4956464A · kind A · utility

11Cited by

6References

7Claims

0Family size

Assignee

BASF SE

Inventors

Herbert Bender · Haßloch, DE
Horst Colberg · Schifferstadt, DE
Friedhelm Teich · Karlsruhe, DE
Reinhard Kemper · Heidelberg, DE

Key dates

Filing date	Oct 27, 1988
Grant date	Sep 11, 1990
Priority date	—
Expiry date	Oct 27, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B48/00
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Dihydroquinacridones, quinacridones and quinacridonequinones are prepared by cyclizing 2,5-dianilino-3,6-dihydroterephthalic acid derivatives or 2,5-dianilinoterephthalic acid derivatives in the liquid or solid state or in solution, in each case in finely divided form, or in the gas phase, in the presence or absence of an oxidizing agent.

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