Patent · US Expired

Dyeing-stable modification of a disperse dyestuff, processes for its preparation and use

US4374640A · kind A · utility

8Cited by

6References

10Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Horst Tappe · Dietzenbach, DE
Hans Mayer · Frankfurt am Main, DE
Klaus Hofmann · Griesheim, DE

Key dates

Filing date	Mar 29, 1982
Grant date	Feb 22, 1983
Priority date	—
Expiry date	Mar 29, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B67/0029
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A dyestuff useful for dyeing and printing synthetic, hydrophobic fibers or mixtures thereof with cellulose fibers and stable under dyeing conditions is a .beta.-modification of a compound of the formula ##STR1## having an X-ray diffraction pattern under Cu-K.alpha.-radiation with high intensity lines at a diffraction angle in .theta. degrees of 3.75, 6.40 and 12.35; PA0 medium intensity lines at a diffraction angle in .theta. degrees of 6.60, 7.30, 7.60, 7.90, 8.10, 8.35, 9.30, 9.70, 9.90, 10.20, 10.50, 12.70 and 13.90; PA0 and low intensity lines at a diffraction angle in .theta. degrees of 5.65, 8.75, 11.25, 11.70, 13.35, 15.10 and 15.55; which is prepared by heating at 50.degree.-150.degree. C. the .alpha.-modification of said compound, which is unstable under dyeing conditions.

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