Patent · US Expired

Dyestuff preparations

US3958929A · kind A · utility

1Cited by

2References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Reinhold Hornle
Hans-Heinz Molls · Leverkusen, DE
Roland Rupp · Bensberg, DE
Robert Kuth · Cologne, DE

Key dates

Filing date	Feb 8, 1974
Grant date	May 25, 1976
Priority date	—
Expiry date	Feb 8, 1994

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S8/912
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Pressing of uniform shape and uniform weight of disperse dyestuffs and optical brightening agents with a solubility in water less than 0.5% at 20.degree.C which are suitable for an automate metering step and which disintegrate in aqueous dye baths to give dispersions are manufactured by compressing the dyestuff or brightening agent, an anionic dispersing agent and a solid water-soluble mould release agent which gives a neutral to weakly alkaline reaction in water.

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