Process for dyeing natural or synthetic polyamide fibre materials with 1:1 metal complex dyes in presence of alkali metal fluordsilicate or amindnlum silicate
US4818248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Sep 30, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/917
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for dyeing natural or synthetic polyamide fibre material from an aqueous liquor with dyes, in the presence of an alkali metal salt or an ammonium salt and in the presence of an assistant, which process comprises dyeing said fibre material with at least one sulfonated 1:1 metal complex dye or with a mixture containing at least one sulfonated 1:1 metal complex dye and at least one sulfonated metal-free dye, in the presence of 10 to 45 percent by weight of an alkali fluorosilicate or ammonium fluorosilicate or a mixture thereof, based on the amount of the 1:1 metal complex dye employed, and in the presence of an assistant at a pH value of 3 to 5. The process of the invention is suitable for dyeing natural or synthetic polyamide materials to give non-skittery and level dyeings of good fastness properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.