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US 4,233,355 AGranted
Separable composite fiber and process for producing same
AssigneeToray Industries, Inc.
InventorsYoshiaki Sato, Hajime Arai
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AssigneeToray Industries, Inc.
InventorsYoshiaki Sato, Hajime Arai
Estimating the term…
A separable unitary composite fiber of the type having a substantially uniformly shaped transverse cross-section along its length and comprised of at least two different polymer components, one of which is soluble in a given solvent and the other of which is relatively insoluble in the given solvent; a plurality of segments of the relatively insoluble polymer component being isolated from each other by the intervening soluble polymer component in the transverse cross-section of the composite fiber. The composite fiber is characterized in that the soluble polymer component is a polyester comprised of 80 to 97% by mole of ethylene terephthalate units and 3 to 20% by mole of ethylene 5-sodium-sulfoisophthalate units, and the relatively insoluble polymer component is a fiber-forming polyester and/or polyamide.
A separable unitary composite fiber having a substantially uniformly shaped transverse cross-section along its length, said composite fiber being comprised of at least two different polymer components, one of which is soluble in a given solvent and the other of which is relatively insoluble in the given solvent, a plurality of segments of said relatively insoluble polymer component being isolated from each other by the intervening soluble polymer component in the transverse cross-section of the composite fiber,
A method of producing a separable unitary composite fiber having a substantially uniformly shaped transverse cross-section along its length, which method comprises spinning at least two different polymers, one of which is a copolyester comprised of 80 to 97% by mole of ethylene terephthalate units and 3 to 20% by mole of ethylene 5-sodium-sulfoisophthalate units and the other of which is a fiber-forming polymer selected from the group consisting of polyester and polyamide, to form a composite fiber having a transverse cross-section such that a plurality of segments of the fiber-forming polymer are isolated from each other by the intervening ethylene terephthalate/ethylene 5-sodium-sulfoisophthalate copolyester.
Dependencies are inferred from the claim text.