| 摘要 |
<p>1,169,106. Artificial fibres having voids. TEIJIN Ltd. 15 March, 1967 [15 March, 1966], No. 12135/67. Heading B5B. [Also in Division D1] Artificial fibres having voids are manufactured by contacting a drawn fibre composed of a uniform blend of 5-50% by weight of fibre forming linear polymers (component A), and 95-50% by weight of fibre forming linear polymers (component B), not compatible with the first named polymers, with chemicals which are capable only of acting on component A and which remove at least a part of said component A thereby forming, in the fibre, a plurality of voids extending lengthwise axially of the fibre. Components A and B may each consist of one or more polymers. Polymers which may be used include polyamides, polyesters, polycarbonates, polyacrylonitrile, polyvinyl chloride and polyolefins. The voids may be distributed uniformly throughout the whole of the fibre, or the fibre may consist of a compact core consisting of component A and component B, and a periphery consisting only of component B and containing substantially all the voids. In the latter case the concentration of the attacking chemical, the length of time for which the fibre is in contact with it, and the temperature, may be controlled so as to remove varying amounts of component A. Aqueous caustic soda may be used to remove polyester from such a composite filament, aqueous formic acid to remove polyamide, and methylene chloride may be used when component A is a polycarbonate.</p> |
