Exhaust dyeing
US5718732A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1996 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Jul 3, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/39
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process of dyeing natural or synthetic polyamide fibres in an aqueous exhaustion dyebath comprising an anionic dyestuff, comprising the steps of PA1 1. immersing the fibres to be dyed in the aqueous dyebath which has a temperature of from 20.degree.-50.degree. C. and a pH of 7-11 (7-8.5 when the polyamide is wool); and PA1 2. raising the temperature to 110.degree. C. maximum and maintaining it there until exhaustion is substantially complete; there being added to the dyebath, either prior to the commencement of temperature raising or after an alkaline migration period at the boil, an ester of a C.sub.2 -C.sub.3 hydroxycarboxylic acid with a C.sub.2 -C.sub.6 glycol and up to 30% by weight of the ester of a tertiary amine which is essentially non-volatile under the process conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.