Composition and method for providing stain resistance to polyamide fibers using carbonated solutions
US5009667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Jan 31, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/34
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Self neutralizing compositions and methods for their use are disclosed for treating polyamide fibers, such as nylon or wool carpeting, to render them stain resistant. The compositions are aqueous solutions carbonated to an appropriate acid pH containing one or more dye-resist agents which are condensation products of formaldehyde and a sulfonated naphthol or phenol. When the carbon dioxide escapes or evaporates subsequent to application, the pH rises to about neutral leaving the dye-resist agent ionically bonded to the polyamide fibers. An appropriate amount of a fluorochemical may also be contained in the solution which also physically interacts with the fibers and deters yellowing caused by the presence of the dye-resist agents. The process can be carried out during one or more cleaning, rinsing or subsequent finishing or protectant steps. In each step, the carbonated solution is applied under pressure at a pH of between about 2.5 and 7.0 and preferably between 3.5 and 6.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.