GB917232A - Poly-n-acrylylpiperidine filaments - Google Patents

Abstract

Filaments are made by the solution-spinning of poly-N-acrylylpiperidine. Solutions of crystalline poly-N-acrylylpiperidine in chlorinated hydrocarbon solvents or mixtures thereof, e.g. methylene chloride, chloroform, tetrachlorethane, chlorobenzene, and mixtures of methylene chloride with either chloroform or chlorobenzene, may be wet-spun into any of the following coagulants:- acetone, aqueous acetone, tetrahydrofuran, methyl ethyl ketone, N:N-dimethylformamide, N:N-dimethylacetamide, cyclohexane and isopropyl alcohol. Chlorinated hydrocarbon solvents boiling below 70 DEG C. are preferred. Alternatively, solutions of crystalline poly-N-acrylylpiperidine in lower fatty acids, e.g. formic or acetic acid, may be wet-spun into water or aqueous alkali. Coagulated wetspun filaments may be stretched in a hot glycerol bath at, e.g. over 60 DEG C., dried, wound-up, and then further stretched, e.g. over a hot plate at temperatures above 130 DEG C. In an example, a 20% w./v. solution of poly-N-acrylylpiperidine in methylene chloride is spun into a coagulating bath of N:N-dimethylformamide at 20 DEG C., and the coagulated filaments are drawn 100% in a glycerol bath at 120 DEG C. After drying, the filaments are further drawn at a draw ratio of 2:1 over a hot plate at 180 DEG C. Crystalline poly-N-acrylylpiperidine may also be dissolved in chloroform or methylene chloride and dry-spun into hot air at a temperature above 40 DEG C. In an example, a 40% w./v. solution of poly-N-acrylylpiperidine in methylene chloride at 38 DEG C. is dry-spun into air at 44 DEG C.