C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
18/25, 6/63, 400
C08L 1/00 (2006.01) C08L 5/00 (2006.01) C08L 77/00 (2006.01)
Patent
CA 1251880
SUBSTANTIALLY HOMOGENEOUS POLYMER SOLUTION IN TERTIARY AMINE N-OXIDE AND PROCESS FOR DIRECTLY EXTRUDING SAME INTO NON-SOLVENT BATH ABSTRACT OF THE INVENTION A new and useful substantially homogeneous extrudable solution of a base material, e.g., cellulose, is disclosed, comprising (a) a predetermined amount of each of two or more tertiary amine oxides, each of which is in a known state of hydration and each having a known melting point, to form an initial mixture, the tertiary amine oxides selected from the group consisting of N,N,N-triethylamine N-oxide; N,N-dimethyl- cyclohexylamine N-oxide; N-methylmorpholine N-oxide; N-methyl- piperidine N-oxide; N-methylhexamethyleneimine N-oxide; N,N-dimethylbenzylamine- N-oxide; and N,N-dimethylethanolamine N-oxide, said amount of each sufficient to depress the melting point of the initial mixture below the melting point of each of said tertiary amine oxides in their known state of hydration and to form said liquid; (b) a predetermined amount or a base material added to said initial liquid mixture, the base material selected from the group consisting of suitable water soluble polymers, nylon, cellulose and other polysaccharides, and (c) water, including but not necessarily limited to the hydrated water above, whereby the amount or initial mixture or tertiary amine oxides (a) is sufficient to dissolve the base material and to form a substantially homogeneous extrudable solution, and the amount of water (c) is just sufficient to provide the dissolved I base material with a predetermined melting point. Preferable combinations of tertiary amine oxides include N-methylmorpholine N-oxide ("NMO" or "NMMO") and N,N-dimethylethanolamine N-oxide ("DMEAO"); NMO and N,N-dimethylcyclohexylamine N-oxide ("DMCAO"); and DMCAO and DMEAO. The novel substantially homogeneous extrudable solutions find particular utility in that they may be directly extruded into non-solvent baths to avoid significant mechanical problems of air gap spinning and to avoid significant cellulose/base material degradation inherent in prior art techniques because of exposure to high temperatures; at the same time the process of the instant invention reduces energy costs. After extrusion, the base material extrudate, e.g., cellulose base material, may be dried in normal fashion to produce a novel product, e.g., membranes. II
442660
Blackwell Robert H.
Dube Michel
Ludwig Julianna V.
Akzona Incorporated
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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