| 摘要 |
941,493. Polyester filaments. IMPERIAL CHEMICAL INDUSTRIES Ltd. Jan. 22, 1962 [Jan. 30, 1961], No. 3439/61. Drawings to Specification. Heading B5B. [Also in Division C3] Melt-spun filaments are made from polyesters of aromatic dicarboxylic acids containing not more than 0.5% of an organopolysiloxane fluid, e.g. 0.05-0.2% of dimethylpolysiloxane. Organopolysiloxanes used may contain alkyl, aryl, substituted alkyl, substituted aryl, alkaryl, aralkyl, or alkenyl groups, examples including methyl, octyl, phenyl,γ-trifluoro-propyl,γ- cyanopropyl, tetrachlorophenyl, vinyl and alkyl groups, and preferably should not contain any silicon-bonded hydrogen atoms. Organopolysiloxane fluids used may be entirely linear or up to about 10% of the silicon atoms may be crosslinked. They may also be end-stopped if desired, e.g. with trimethylsilyl groups. The polyester may be one derived from terephthalic acid, especially polyethylene terephthalate, polyesters of ethylene glycol with a mixture of terephthalic/5 (sodium sulpho) isophthalic acids, with a mixture of terephthalic and isophthalic acids, or with a mixture of terephthalic and another dibasic acid, e.g. sebacic or adipic acid, or a hydroxy carboxylic acid, e.g. p-hydroxybenzoic acid. Polyesters of terephthalic acid with a glycol other than ethylene glycol, e.g. 1: 4-bis-(hydroxymethyl) cyclohexane may also be used. Filaments so made have a greatly reduced tendency to break during spinning.
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