Method for producing regenerated cellulose fibers having excelle

Details Method for producing regenerated cellulose fibers having excelle Method for producing regenerated cellulose fibers having excelle

1976-02-27

1978-01-03

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

106 15FP, 106177, 260 457P, 260931, 264197, D01F 208

Patent

active

040667308

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.

REFERENCES:
patent: 3058941 (1962-10-01), Birum
patent: 3507610 (1970-04-01), Tesoro et al.
patent: 3836507 (1974-09-01), Yoshizawa et al.

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