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Multi-component fiber, the method for making said and polyurethane matrix sheets formed from said
| Details |
Inventors: Okamoto, Miyoshi; Watanabe, Koji; Izumi, Zenji; Aya, Toshihiko; Kitagawa, Hideaki;
Assignee: Toray Industries, Inc. (Tokyo, JA)
Primary Examiner: Cannon; J.C.
Assistant Examiner:
Attorney, Agent or Firm:
A multi-component thermoplastic fiber comprising a specified component of a copolymer of the vinyl series, and having very excellent drawability at a low temperature and excellent dimensional stability and a method of obtaining said product. |
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DETAILED DESCRIPTION The following is claimed: 1.
In a method of making a sheet-like material comprising bundles of fiber forming synthetic polyester fine fibers and a polyurethane binder, the steps which comprise (1) spinning a plurality of multi-component fibers comprising (A) a fiber forming synthetic polyester and (B) a component removable by dissolution in a solvent which does not dissolve the fine fibers comprising component (A), wherein said component (B) comprises substantially a copolymer of styrene and about 10 - 30% by weight of a higher alcohol ester of an acid selected from the group consisting of acrylic acid and methacrylic acid, said higher alcohol containing 6 - 20 carbon atoms and having a boiling point of at least 150.
degree.
C at 760 mm Hg, (2) making a primary sheet material from said multi-component fibers, (3) impregnating said primary sheet material with a water soluble sizing agent, (4) dissolving out component (B) to make an intermediate sheet material comprising bundles of fiber forming synthetic polyester fine fibers and the water soluble sizing agent, (5) combining said bundles with a polyurethane binder, and (6) removing said water soluble sizing agent.
2.
In a method of making a sheet-like material comprising bundles of fiber forming synthetic polyester fine fibers and a polyurethane binder, the steps which comprise (1) spinning a plurality of multi-component fibers comprising (A) a fiber forming synthetic polyester and (B) a component removable by dissolution in a solvent which does not dissolve the fine fibers comprising component (A), wherein said component (B) comprises substantially a copolymer of styrene and about 10 - 30% by weight of a higher alcohol ester of an acid selected from the group consisting of acrylic acid and methacrylic acid, said higher alcohol containing 6 - 20 carbon atoms and having a boiling point of at least 150.
degree.
C at 760 mm Hg, (2) making a primary sheet material from said multi-component fibers, (3) dissolving out component (B) to make an intermediate sheet material comprising bundles of fiber forming synthetic polyester fine fibers, and (4) combining said bundles with a polyurethane binder
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