| 摘要 |
1,004,123. Spinning polyester monofilaments. IMPERIAL CHEMICAL INDUSTRIES Ltd. July 25, 1963 [Aug. 22, 1962], No. 32287/62. Heading B5B. Molten macromolecular polyesters or copolyesters are extruded from a spinneret through a gaseous medium into a bath of cooling liquid which is at a temperature of at least 40‹ C., to form monofilaments. The polyesters and copolyesters are defined as polyesters made by reaction of an aromatic dicarboxylic acid having at least 8 carbon atoms with an aliphatic, alicyclic or alkaryl glycol having 2-10 carbon atoms, and copolyesters of an aromatic dicarboxylic acid and a glycol of the foregoing type with a minor proportion of another aromatic or aliphatic dicarboxylic acid, or an aromatic monohydroxy - monocarboxylic acid, or a minor proportion of a second glycol of the foregoing type. The carboxylic acids may be replaced by suitable derivatives, e.g. esters. In examples, monofilaments of polyethylene terephthalate are melt-extruded through air gaps of various distances into cooling liquids at 60-77À5‹ C. The filaments, when extruded through circular orifices, show less ovality. The filaments may also be non-circular, e.g. triangular or oblate. Specifications 550,852 and 838,696 are referred to.
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