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AssigneeMitsubishi Rayon Co., Ltd.
InventorsKazuya Chimura, Takashi Kaneko, Shunichi Takashima, Masao Kawashima, Ryuichi Nakazono
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A novel unitary spun polyester composite filament is provided. The composite filament consists essentially of (a) a block copolymer, as the first component, having a melting point of not lower than 170.degree.C and consisting essentially of 35-80 wt. % of a polyester, as the hard segment, predominantly containing a tetramethylene terephthalate unit and 20-65 wt. % of a long-chain glycol having a molecular weight of 500 to 5,000 as the soft segment, and (b) a polyester, as the second component, predominantly containing a tetramethylene terephthalate unit. The composite filament produces crimps superior particularly in percent of crimp and percent of crimp retentivity when drawn and relaxed.
A unitary spun composite filament consisting essentially of (a) a block copolymer, as the first component, having a melting point of not lower than 170.degree.C and consisting essentially of 35 to 80% by weight of a polyester, as the hard segment, containing not less than 80% by mole of a tetramethylene terephthalate unit and 20 to 65% by weight of units derived from polytetramethyleneether glycol having a molecular weight of 500 to 5000 and (b) a polyester, as the second component, containing not less than 80% by mole of a tetramethylene terephthalate unit, said components (a) and (b) being present in the filament in a side-by-side relationship and bonded together.
Dependencies are inferred from the claim text.