Method for producing regenerated cellulose fibers having excellent flameproofness
US4066730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Feb 27, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2697
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Regenerated cellulose fibers having very good flameproofness are obtained by adding a polyphosphonate having the following formula: ##STR1## wherein R.sub.1 is ethylene or propylene; R.sub.2 and R.sub.3 are methyl or ethyl which may be the same or different; R.sub.4 is an alkyl group having 1 to 4 carbon atoms, or an aralkyl group in which the alkyl substituent has 1 to 4 carbon atoms and the hydrogen atoms in said alkyl and aralkyl groups may be substituted with chlorine or bromine; R.sub.5 is an aromatic group having 1 to 20 carbon atoms or an unsaturated or saturated aliphatic or alicyclic group having 1 to 20 carbon atoms or a combination thereof and R.sub.5 may contain carbonyl group, sulfonyl group or nitrogen; X is halogen, and n is an integer from 1 to 1000, to a viscose and then spinning the viscose by conventionally accepted procedures. The retention of the polyphosphonate flameproofing agent in the fibers can be markedly increased by this procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.