Modacrylic synthetic fiber having an excellent devitrification preventing property and a process for preparing the same
US4524193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1982 |
| Grant date | Jun 18, 1985 |
| Priority date | — |
| Expiry date | Sep 21, 2002 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/40
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A modacrylic fiber comprising a copolymer containing acrylonitrile, at least one of vinyl chloride and vinylidene chloride, and a sulfo group-containing vinyl monomer having a relative reactivity of at least 1 to acrylonitrile, in a specific ratio. The copolymer is prepared by polymerizing the monomers, while adding the sulfo group-containing vinyl monomer to the polymerization system under the following condition: EQU 16<Y-X<83 wherein X and Y are percentages of the amount of a polymer produced at the time of starting the addition and the amount of a polymer produced at the time of finishing the addition, respectively, based on the amount of the whole polymer to be produced. The fiber has an excellent flame resistance and an excellent devitrification preventing property. Also, when the polymerization is conducted in emulsion polymerization manner under additional condition that Y is more than 71, the obtained emulsion is very stable and the polymer can be recovered from the emulsion in improved drying efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.