Exhaust dyeing process for mixed fibre substrate in single bath: disperse dye, copper complex dye, complexing agent and oxidizing agent
First Claim
1. A process for dyeing a mixed polyester/cellulose or polyamide/cellulose fibrous substrate comprising applying to the substrate by exhaust dyeing in an aqueous dyebath at a temperature in the range 60°
- -135°
C.;
a) at least one disperse dye;
b) at least one copper-containing direct or reactive dye;
c) a complexing agent having a K-value with the metal of the direct or reactive dye of from 6 to 17 inclusive;
d) a lignin sulphonate dispersing agent; and
e) an oxidizing agent capable of converting copper (I) to copper (II) at a temperature of 100°
-130°
C. at a pH of 5 to 7 in the process for dyeing the mixed substrate and selected from the group consisting of alkali metal and alkaline earth metal chlorates, bromates and iodates.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for dyeing a mixed fibrous substrate comprising applying to the substrate,
a) at least one disperse dye,
b) at least one copper - containing direct or reactive dye, preferably in a sufficient amount to produce a dyeing greater than a 1/1 standard depth;
c) a complexing agent having a stability constant (K-value) with the metal of the direct or reactive dye of from 6 to 17 inclusive;
d) a lignin sulphonate dispersing agent; and
e) an oxidizing agent capable of converting copper (I) to copper (II) at a temperature of 100°-130° C. at a pH of 5-7 in the process for dyeing the mixed substrate.
14 Citations
32 Claims
-
1. A process for dyeing a mixed polyester/cellulose or polyamide/cellulose fibrous substrate comprising applying to the substrate by exhaust dyeing in an aqueous dyebath at a temperature in the range 60°
- -135°
C.;a) at least one disperse dye; b) at least one copper-containing direct or reactive dye; c) a complexing agent having a K-value with the metal of the direct or reactive dye of from 6 to 17 inclusive; d) a lignin sulphonate dispersing agent; and e) an oxidizing agent capable of converting copper (I) to copper (II) at a temperature of 100°
-130°
C. at a pH of 5 to 7 in the process for dyeing the mixed substrate and selected from the group consisting of alkali metal and alkaline earth metal chlorates, bromates and iodates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- -135°
-
11. A mixed polyester/cellulose or polyamide/cellulose fibrous substrate which has been dyed by exhaust dyeing in an aqueous dyebath at a temperature in the range 60°
- -135°
C. with at least one disperse dye and at least one copper-containing direct and/or reactive dye in the presence of a complexing agent having a K-value with the metal of the direct or reactive dye of from 6 to 17 inclusive and an oxidizing agent capable of converting copper (I) to copper (II) at a temperature of 100°
-130°
at a pH of 5 to 7 in the process for dyeing the mixed substrate, said oxidizing agent being selected from the group consisting of alkali metal and alkaline earth metal chlorates, bromates and iodates.
- -135°
Specification