Continuous thermosol dyeing of high-modulus, high-tenacity, low-shrinkage polyamide fabrics with acid dyes
AssigneeBurlington Industries, Inc.
InventorSamir Hussamy
Life of this patent
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Abstract
Fabrics constructed of high-modulus, high-tenacity, low-shrinkage polyamide fabrics are continuously dyed with acid dyes by applying at ambient temperatures a pad bath solution formulated to provide a continuous film on the fabric surface followed by drying and dry heat curing or thermosoling at elevated temperatures to fix the dye molecules inside the fibers.
Claims18
A process for the continuous dyeing of fabrics constructed of high-modulus, high-tenacity low-shrinkage Polyamide fibers with acid dyes comprising the successive steps of:
- (a) padding polyamide fabric in open width form in a pad bath solution maintained at a temperature not greater than about 35.degree. C., the pad bath solution applied to the fabric as a uniform film and consisting essentially of a thickening agent, an antimigrant, an organic acid, a polyethylene glycol compound, a polyoxyethylene sorbitan fatty acid ester, a polyalkylene glycol ether, at least one acid dyestuff, and water;
- (b) drying and curing the thus padded fabric under dry conditions at an elevated temperature and for a time sufficient to permeate and fix the dyestuff molecules inside the polyamide fibers, and
- (c) rinsing and washing the thus cured fabric to remove any residual unfixed dye or other water-soluble components from the fabric.
A process for continuously dyeing fabrics constructed of high-modulus, high-tenacity low-shrinkage nylon 6,6 fibers comprising the successive steps of:
- (1) applying to the nylon 6,6 fabric in open width a uniform film of a pad bath solution maintained at a temperature not greater than about 35.degree. C., the pad bath solution consisting essentially, in percent by weight of the solution, of:
- (a) a thickening agent;
- (b) from about 1% to 10% of an organic acid selected from the group consisting of ethanedioic acid, 2,3-dihydroxybutanedioic acid, 2-hydroxy-1,2,3-propanetricarboxylic acid, hydroxyacetic acid, propanoic acid, butanedioic acid, butenedioic acid, and mixtures thereof;
- (c) an antimigrant agent;
- (d) from about 0.5% to about 5.0% of a polyethylene glycol having a molecular weight between about 400 and about 8,000;
- (e) from about 0.5% to about 5.0% of a polyoxyethylene sorbitan fatty acid ester in wich the residue of the fatty acid moiety is derived from lauric acid, palamitic acid, stearic acid, or oleic acid;
- (f) from about 0.2% to about 2.0% of a polyalkylene glycol ether having a molecular weight between about 600 and about 700;
- (g) a tinctorial amount of at least one acid dyestuff that is soluble in and compatible with the pad bath solution;
- (2) drying and thus padded fabric;
- (3) dry heat curing or thermosoling the dried fabric in an oven at an elevated temperature at atmospheric condition or under pressure, for a time sufficient to permeate and fix the dyestuff molecules inside the polyamide fibers;
- and
- (4) washing and rinsing the thus treated fabric to remove any unfixed dye or water soluble components from the fabric.
Dependencies are inferred from the claim text.