| 摘要 |
1,103,565. Spandex fibres. COURTAULDS Ltd. 18 Dec., 1964 [20 Dec., 1963; 23 July, 1964], Nos. 50311/63 and 29643/64. Heading B5B. Spandex fibres are produced by extruding a reaction product of a polyester and a polyisocyanate or of a polyether and a polyisocyanate through a jet into a coagulating bath which contains a primary aliphatic diamine and a diluent comprising an aliphatic or cycloaliphatic mono-alcohol, the concentration of diamine in the bath being not greater than 30 grams per 100 c.c. of the bath and the bath being either anhydrous or containing water in a concentration not exceeding 5% by weight based on the weight of the bath. In forming the reaction product, i.e. the precursor of the spandex fibres, the polyesters used are defined as the known types of chain-extended polyesters obtained by condensing polybasic acids, preferably dibasic carboxylic acids, with one or more glycols to produce polymers having terminal carboxyl groups, for example polyethylene adipate, polypropylene adipate, polyethylene sebacate, polypropylene sebacate and mixed esters obtained from a dibasic acid, for example adipic acid or sebacic acid, and mixtures of ethylene glycol and propylene glycol; the polyethers used are defined as the known types of chain-extended polyethers having ether linkages separated by ethylene, propylene or butylene groups and having terminal hydroxyl groups capable of reacting with isocyanate groups, for example polyethylene glycols, polypropylene glycols and polytetramethylene glyools. The polyisocyanate used to react with the polyester or polyether may be a di-isocyanate for example meta- or para-phenylene di-isocyanate, diphenyl methane di-isocyanate or tolylene di-isocyanate. In the coagulating bath, the preferred diamine is ethylene diamine, but diamines disclosed in Specification 847,673 may be used; the alcohol may be methanol, ethanol, n- or iso-propyl alcohol, n-, sec-, tert- or iso-butyl alcohol, cyclohexanol or the monoethyl ether of ethylene glycol. The preferred alcohol is isopropyl when there may be from 9 to 22 grams of ethylene diamine per 100 c.c. of the bath for an immersion length of the fibres not greater than 1 inch, or only 4 grams of ethylene diamine per 100 c.c. of the bath for an immersion length of from 3 to 4 inches.
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