Water-absorbing acrylic fibers
US4562114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1985 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Feb 14, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2978
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Novel porous water-absorbing acrylic fibers composed of not less than 90 weight % of an acrylonitrile polymer and having dispersed therein less than 10 weight % of a water-absorbing resin particles containing carboxyl groups (represented by --COOX wherein X is H, HN.sub.4 or an alkali-metal) and having a degree of water-swellability of 10-300 cc/g, the particle diameter of which resin is not larger than 0.5.mu. at absolute dryness, the carboxyl groups in the water absorbing resin present at least in the outer layer of the fibers being of the type where X is H, and in the inner portion being of the type where X is NH.sub.4 or an alkali metal, said fibers containing pores not smaller than 0.2.mu. in their largest diameter in the inner layer of the fibers and said fibers having a water holding ratio not lower than 20%. The acrylic fibers provided are novel, porous and water-absorbing, having a stable water-absorbing ability which will not be easily lowered by heat treatment, etc. The fibers are excellent in physical properties such as strength, elongation, etc. and in practical properties such as spinnability, etc. and are greatly improved in dyeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.