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AssigneeChisso Corporation
InventorsHiroaki Nishioi, Satoshi Ogata, Yoshimi Tsujiyama
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A web or a fibers consisting of microfibers having a fineness of 0.01 denier or less is provided, which web or fibers is obtained by spinning conjugate fibers consisting of microfibers-generating fibers of island-in-sea type, according to melt blown process, the sea component being a thermoplastic resin (polyvinyl alcohol) capable of being removed with a solvent (water) and the island component being a thermoplastic resin (polypropylene) insoluble in the solvent used for the sea component, followed by collecting the spun conjugate fibers in the form of a web or a tow; the resulting composite fibers being thinner than those obtained according to conventional conjugate spinning and the microfibers obtained by removing the sea component also being thinner than fibers obtained from conventional conjugate fibers of island-in-sea type.
Microfibers-generating fibers consisting essentially of island-in-sea type conjugate fibers spun according to a melt blown process, the sea part of said conjugate fibers being composed of a thermoplastic polymer capable of being removed with a solvent and the island part thereof being composed of a thermoplastic polymer insoluble in said solvent and forming microfibers having a fineness of a single fiber of 0.01 denier or less.
Dependencies are inferred from the claim text.