Indigo dye process

Details Indigo dye process Indigo dye process

1993-05-10

1995-01-03

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Inorganic additive for dye composition, dye composition...

Group iiia metal

8653, 8646, 8918, C09B 6700, C09B 6100, C09B 700, D06P 134

Patent

active

053782461

ABSTRACT:
An improved nonpolluting method of dyeing fibers or fabric, including natural cellulose fibers such as cotton or linen, using indigo dye. The improved process includes pretreating the fibers with a mordant solution, preferably a natural nonpolluting mordant solution. The fibers are then treated with a reduced indigo liquor in an inert atmosphere, preferably nitrogen. The indigo is then oxidized by flooding the dyed fabric with cold water. This indigo dye process can be adapted to conventional garment, package and piece dye processes and machinery, which has not been possible with existing indigo dye processes. The improved process results in a more consistent and even dyed material which is color and washfast.

REFERENCES:
patent: 678 (1838-04-01), Woodcroft
patent: 83502 (1863-10-01), Iversen
patent: 4166717 (1979-09-01), Fono et al.
patent: 4247295 (1981-01-01), Patxot
patent: 4283198 (1981-08-01), Fletcher
patent: 4613336 (1986-09-01), Quinnen
patent: 4752301 (1988-06-01), Koch
Bliss, Ann, A Handbook of Dyes from Natural Materials, pp. 38-39; Charles Scribner's Sons (1981).
Yoshii, Akiko; Tanebe, Kenichi; Tari, Isao, "Studies on the dyeing behavior of indigo in nitrogen", from Chem. Abstract, CA 109(22) 192037f, 1987.

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