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AssigneeKuraray Co., Ltd.
InventorsTakashi Katayama, Kazuhiko Tanaka, Naoki Fujiwara, Tomoaki Kimura, Akihiro Hokimoto, Nobuhiro Koga, Hitoshi Nakatsuka, Yoshimi Umemura, Hiroshi Kanehira, Masao Kawamoto, Junyo Nakagawa
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Provided are melt-spun fibers comprising, as at least one component, a water-soluble polyvinyl alcohol, and a method for producing fibrous structures comprising the fibers. The thermoplastic polyvinyl alcohol fibers comprise, as at least one component, a water-soluble polyvinyl alcohol containing from 0.1 to 25 mol % of C1-4 α-olefin units and/or vinyl ether units, having a molar fraction, based on vinyl alcohol units, of a hydroxyl group of vinyl alcohol unit located at the center of 3 successive vinyl alcohol unit chain in terms of triad expression of being from 70 to 99.9 mol %, having a carboxylic acid and lactone ring content of from 0.02 to 0.15 mol %, and having a melting point falling between 160° C. and 230° C., and contain from 0.0003 to 1 part by weight, relative to 100 parts by weight of the polyvinyl alcohol therein and in terms of sodium ion, of an alkali metal ion.
A thermoplastic polyvinyl alcohol fiber which comprises, as at least one component, a water-soluble polyvinyl alcohol, wherein the water-soluble polyvinyl alcohol
A method for producing thermoplastic polyvinyl alcohol fibers, which comprises melt-spinning a water-soluble polyvinyl alcohol containing from 0.1 to 25 mol % of C1-4 α-olefin units and/or vinyl ether units, having a molar fraction, based on vinyl alcohol units, of a hydroxyl group of vinyl alcohol unit located at the center of 3 successive vinyl alcohol unit chain in terms of triad expression of from 70 to 99.9 mol %, having a carboxylic acid and lactone ring content of from 0.02 to 0.15 mol %, has a melting point (Tm) falling between 160° C. and 230° C., and containing an alkali metal ion in an amount in terms of sodium ion of 0.0003 to 1 part by weight based on 100 parts by weight of the polyvinyl alcohol, at a spinneret temperature falling between Tm and Tm+80° C., at a shear rate (γ) of from 1,000 to 25,000 sec−1, and at a draft of from 10 to 500.
A non-woven fabric which is comprised of fibers comprising, as at least one component, a modified polyvinyl alcohol containing from 0.1 to 25 mol % of C1-4 α-olefin units and/or vinyl ether units, having a molar fraction, based on vinyl alcohol units, of a hydroxyl group of vinyl alcohol unit located at the center of 3 successive vinyl alcohol unit chain in terms of triad expression of from 66 to 99.9 mol %, having a carboxylic acid and lactone ring content of from 0.02 to 0.15 mol %, and has a melting point (Tm) falling between 160° C. and 230° C., and which contains an alkali metal ion in an amount in terms of sodium ion of 0.0003 to 1 part by weight based on 100 parts by weight of the polyvinyl alcohol.
Dependencies are inferred from the claim text.