Process for the end-to-end dyeing of cellulosic fibres: desalted direct dye and migration inhibitor
First Claim
1. A process for the end-to-end dyeing of cellulosic fibres or cellulosic fibre blends with direct dyes by the pad dyeing process, which comprises padding said fibre materials with an aqueous liquor containing one or more deionised direct dyes having a salt content of 2.5% or less by weight of the dye and a migration inhibitor, then expressing the padded goods and subsequently fixing the dye thereon, said migration inhibitor selected from the group consisting of alginates, polyacrylates, copolymers derived from acrylic acid or acrylamide with other comonomers, alkyl sulfates, ethylene oxide adducts, polyglycol ethers, oxypropylation products, cellulose or starch ethers, locust bean gum ethers, carboxymethyl celluloses, modified polysaccharides, polyvinyl alcohols and other polyelectrolytes.
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Abstract
The invention relates to a process for the end-to-end dyeing of cellulosic fibres or cellulosic fibre blends with direct dyes by the pad dyeing process, which comprises padding said fibre materials with an aqueous liquor containing one or more deionized dyes and a migration inhibitor, then expressing the padded goods and subsequently fixing the dye thereon.
The process of the invention is suitable for dyeing textile cellulosic fibres or cellulosic fibre blends end-to-end in shades of good allround fastness properties.
15 Citations
11 Claims
- 1. A process for the end-to-end dyeing of cellulosic fibres or cellulosic fibre blends with direct dyes by the pad dyeing process, which comprises padding said fibre materials with an aqueous liquor containing one or more deionised direct dyes having a salt content of 2.5% or less by weight of the dye and a migration inhibitor, then expressing the padded goods and subsequently fixing the dye thereon, said migration inhibitor selected from the group consisting of alginates, polyacrylates, copolymers derived from acrylic acid or acrylamide with other comonomers, alkyl sulfates, ethylene oxide adducts, polyglycol ethers, oxypropylation products, cellulose or starch ethers, locust bean gum ethers, carboxymethyl celluloses, modified polysaccharides, polyvinyl alcohols and other polyelectrolytes.
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10. A process for the end-to-end dyeing of textile fibre materials made of mercerised or bleached cotton or of textile polyester/cotton blends with direct dyes by the pad dyeing process, which comprises padding said fibre materials with an aqueous liquor containing ≦
- 5 g/l of dye having a salt content of ≦
2.5%, based on the weight of the dye, and 1 to 7.5 g/l of a polyacrylate as migration inhibitor, then expressing the padded goods and subsequently fixing the dye on the fibre by the cold pad-batch method.
- 5 g/l of dye having a salt content of ≦
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11. A process for the end-to-end dyeing of textile fibre materials made of mercerised or bleached cotton with direct dyes by the pad dyeing process, which comprises padding said fibre materials with an aqueous liquor containing ≦
- 3 g/l of dye having a salt content of ≦
1%, based on the weight of the dye, and 1 to 5 g/l of an aqueous solution of a polyacrylic acid derivative as migration inhibitor and a total amount of 0.25 to 5 g/l of one ore more anionic wetting and/or levelling agents, then expressing the padded goods and subsequently rolling up and batching the material for 6 to 48 hours.
- 3 g/l of dye having a salt content of ≦
Specification