Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1974-11-26
1977-01-04
Woo, Jay H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
264182, 526342, D01F 618, C08F22042
Patent
active
040014851
ABSTRACT:
An improved process for the wet-spinning of acrylic polymers is disclosed, wherein a spinning solution of an acrylic polymer in an organic solvent, such as dimethylacetamide or dimethylformamide, is extruded through a spinneret into a coagulating bath consisting essentially of water and an organic solvent in a ratio between 30:70 and 60:40 by weight, and wherein the filaments thus obtained are washed, stretched and heat treated, and wherein the coagulating bath contains from 0.03% to 3% by weight of acid corresponding to said organic solvent and has a pH value greater than 5, and preferably between 6.5 and 8. The spinning solvent is preferably dimethylacetamide containing free acetic acid to an extent of less than 0.1% by weight, the acetic acid if necessary being added to the coagulating bath to bring its concentration up to values between 0.03% and 3% by weight. The pH value greater than 5 is obtained by the addition to the coagulating bath of ammonium hydroxide, an alkali metal hydroxide, or dimethylamine.
REFERENCES:
patent: 2902335 (1959-09-01), Salcurai et al.
patent: 3318983 (1967-05-01), Hovie et al.
patent: 3440148 (1969-04-01), Melauci et al.
Mazzuco Pier Luigi
Niero Ennio
Patron Luigi
Trevisan Enzo
Veneto Favato
Montefibre S.p.A.
Woo Jay H.
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