Patent · US Expired

Doubled triphenylmethane dyes having bis acylpiperazine linkage

US5051504A · kind A · utility

4Cited by

6References

2Claims

0Family size

Assignee

BASF SE

Inventors

Erwin Hahn · Heidelberg, DE
Walter Breitschaft · Ludwigshafen, DE
Udo Mayer · Bischofswerda, DE
Gunter-Rudolf Schroeder

Key dates

Filing date	May 10, 1990
Grant date	Sep 24, 1991
Priority date	—
Expiry date	May 10, 2010

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B11/18
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Triphenylmethane dyes of the formula ##STR1## where each R.sup.1 is independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.6 -alkyl, or two R.sup.1 radicals together with the nitrogen atom joining them form a heterocyclic radical, PA0 R.sup.2 and R.sup.5 is independently of the others hydrogen or C.sub.1 -C.sub.4 -alkyl, PA0 R.sup.3 and R.sup.4 is independently of the others hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or halogen, PA0 An.sup..crclbar. is one equivalent of an anion, and PA0 n is 1 or 2, PA0 preparable from piperazine derivatives as intermediates, are useful for coloring paper.

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