Patent · US Expired

Spray-drying method for the preparation of water-dispersible pulverulent disperse dye formulations

US4213900A · kind A · utility

2Cited by

2References

13Claims

0Family size

Assignee

BASF SE

Inventors

Ewald Daubach · Ludwigshafen, DE
Dieter Horn · Heidelberg, DE
Erwin Hahn · Heidelberg, DE
Herbert Uhrig · Duluth, US

Key dates

Filing date	Jul 17, 1978
Grant date	Jul 22, 1980
Priority date	—
Expiry date	Jul 17, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S534/01
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Easily water-dispersible pulverulent formulations of disperse dyes are prepared by spray-drying a dye solution which comprises PA1 (a) one or more disperse dyes, PA1 (b) one or more water-soluble anionic dispersants, PA1 (c) from 0 to 20% by weight, based on (a+b+c+d), of other surfactants and PA1 (d) from 0 to 20% by weight, based on (a+b+c+d) of agents which serve as protective colloids (the proportion of (c+d) being at most 20% by weight). Suitable solvents (e) are formic acid, formamide, N-methylformamide, butyrolactone, ethylene glycol and propylene glycol, which may in addition contain up to 100% by weight, based on (e), of N,N-dimethylformamide or acetic acid or mixtures of these. The formulations obtained by the above process contain the dye in very fine dispersion.

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