Composition and method for removal of stains from fibers
US5002684A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Solutions and method for the solubilizing and removal of dyes, synthetic red dyes in particular, are disclosed. The solutions consist of an aqueous mixture containing as essential ingredients (1) a detergent, preferably anionic, (2) a sulfite or bisulfite, (3) a lower alcohol and (4) ammonia or an amine. The combined ingredients cooperate to chemically alter the dye chromophore causing it to become soluble. The dye is removed by placing the solution on fibers stained with the dye for a time sufficient to allow the dye to be made soluble and the solution is then removed by either suction or absorption. Some dyes require treatment of the fiber with a solution followed by the application of moist heat through an absorbent material to assist in solubilizing and transferring the dye to the absorbent material. Particularly preferred are solutions consisting of 0.1-6% w. of a lauryl sulfate detergent salt, 5-15% w. of a sulfite or bisulfite, 20-40% w. of ethanol or methanol or a mixture thereof, and 2-10% w. of ammonia or a low alkyl or alkanol amine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.