US 4,359,322 A · Dyeing process

Abstract

A one bath dyeing process for dyeing cellulosic containing textile materials with fiber reactive dyestuffs, including polyester-cellulosic blends with disperse and fiber reactive dyestuffs. Material to be dyed is prepared for dyeing while avoiding residual chemicals that could retard dyeing. Dyestuffs and auxiliaries are added to the dye bath along with specified amounts of alkali and electrolyte and the materials subjected thereto at proper time-temperature relationships for level dyeing of a particular shade. Dye bath pH is maintained in a range of from about 8.0 to about 12.5 with total alkalinity being in a range of from about 1 to about 8 grams alkali per liter of dye bath. Electrolyte content in the dye bath is in a range of from about 50 to about 200 grams of electrolyte per liter of dye bath. For certain reactive dyestuffs, following the initial dye cycle, dye bath temperature is reduced, further alkali is added and a further short dye cycle is run to improve dye yield or wet fastness.

Claims26

Dependent claims

A one bath process for dyeing cellulosic containing textile materials with fiber-reactive dyestuffs comprising the steps of:

(a) preparing a dye bath which comprises a dye assist system that is stable to high electrolyte and alkali;
from about 110 to about 160 grams of electrolyte per liter of bath;
and a predetermined amount of alkaline material that permits proper exhaustion of dyestuff therefrom and level dyeing, said dye bath having a pH of from about 8.5 to about 12.5;
(b) adding a predetermined dyestuff formulation to the dye bath to achieve a predetermined shade, said dyestuff formula containing at least one fiber reactive dyestuff;
(c) subjecting said material to said dye bath at a predetermined time-temperature relationship to dye said material to said shade;
and
(d) thereafter rinsing and scouring said material.

4 more elements

A one bath process for dyeing polyester-cotton textile materials comprising the steps of:

(a) providing a dye bath;
(b) adding from about 0.5 to about 3.5 weight percent of a dye assist to the dye bath, said dye assist being an anionic blend of low forming surface reactive agents, said dye assist blend being stable to high electrolyte and high bath pH;
(c) adding from about 1.5 to about 12.0 weight percent of a disperse dye carrier to said dye bath, said carrier comprising from about 93 to about 70 weight percent solvent and fromabout 7 to about 30 weight percent emulsifier, said carrier being stable to high electrolyte content and high bath pH;
(d) adding alkali to the dye bath to provide a bath pH of from about 8.0 to about 12.5 and a total alkalinity at which appreciable alkaline hydrolysis is avoided in the presence of from about 110 to about 160 grams of electrolyte per liter of bath;
(e) adding to the dye bath from about 110 to about 160 grams of electrolyte per liter of bath;
(f) adding a predetermined dyestuff formulation to the dye bath to dye said polyester-cotton material to said desired shade, said dyestuff formulation comprising at least one disperse dyestuff that is stable against hydrolysis at a pH in a range of from about 8.0 to about 12.5 and at least one fiber reactive dyestuff;
(g) heating said dye bath to a temperature of from about 212.degree. F. to about 250.degree. F. and subjecting said material thereto for from about 30 to about 60 minutes until said desired shade is obtained;
and
(h) thereafter rinsing and scouring said material.

6 more elements

Dependencies are inferred from the claim text.

Dyeing process

Life of this patent

Dyeing process

Life of this patent

Abstract

Claims26