Rapid dyeing of polyester fibers with a mixture of disperse dyes
AssigneeSandoz Ltd.
InventorsRolf Hasler, Beat Henzi, Ernst Schnider, Hermann Ulshoefer
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Abstract
Disclosed is a method of rapid dyeing a substrate comprising polyester fibres at a temperature above 100.degree. C. comprising bringing into contact with the substrate an aqueous dyebath containing a mixture of at least two disperse dyes having each individually specific physicochemical properties.
Claims20
A method of rapid dyeing a substrate comprising polyester fibers comprising bringing into contact with the substrate an aqueous dyebath at a temperature above 100.degree. C. and containing a mixture of at least two disperse dyes, said mixture consisting of disperse dyes having each individually
- (i) a degree of absorption A.gtoreq.90% after 5 minutes at 130.degree. C. and .gtoreq.95% after 20 minutes of 130.degree. C. for a standard dyeing depth of 4.times.1/1, the starting dyeing temperature being 70.degree. C. and the heating rate 3.degree. C./minute,
- (ii) a diffusion coefficient D at 130.degree. C. .gtoreq.1.6.10.sup.-10 cm.sup.2.sec.sup.-1,
- (iii) a ratio C..degree./RTT.gtoreq.14 wherein C..degree. is the saturation concentration in mg dye per g substrate and RTT is the dye concentration in mg per g substrate required for the standard dyeing depth 1/1, and
- (iv) a kinetic parameter Z.gtoreq.1.6.10.sup.-4 wherein Z=k.C..degree./RTT.sub..sqroot.D wherein k=1 cm.sup.-1 sec.sup.1/2.
A dyebath containing a mixture of at least 2 disperse dyes, said mixture consisting of disperse dyes having each
- (i) a degree of adsorption A.gtoreq.90% after 5 minutes at 130.degree. C. and .gtoreq.90% after 20 minutes at 130.degree. C. for a standard dyeing depth of 4.times.1/1, the starting dyeing temperature being 70.degree. C. and the heating rate 3.degree. C./minute,
- (ii) a diffusion coefficient D at 130.degree. C. .gtoreq.1.6.10.sup.-10 cm.sup.2.sec.sup.-1
- (iii) a ratio C..degree./RTT.gtoreq.14 wherein C..degree. is the saturation concentration in mg dye per g substrate and RTT is the dye concentration in mg per g substrate required for the standard dyeing depth 1/1, and
- (iv) a kinetic parameter Z.gtoreq.1.6.10.sup.-4 wherein Z=k.C..degree./RTT.sub..sqroot.D wherein k=1 cm.sup.-1 sec.sup.1/2.
Dependencies are inferred from the claim text.