Title:
COMPOSITE FIBER, METHOD FOR PRODUCING SAME, AND FIBER STRUCTURE INCLUDING SAME
Document Type and Number:
WIPO Patent Application WO/2024/043348
Kind Code:
A1
Abstract:
The present invention relates to a composite fiber containing a first component and a second component, wherein: the first component contains poly-L-lactic acid; the second component contains a biodegradable resin different from the poly-L-lactic acid; the first component and/or the second component is divided into two or more segments when viewed from a cross-section of the fiber; a part of the first component and a part of the second component are exposed on the surface of the composite fiber; and in a DSC curve, at least one of the following (1) to (4) is satisfied, or in X-ray diffraction measurement, the crystallite size of poly-L-lactic acid is 92-122 Å. (1) The heat of fusion per unit mass of the poly-L-lactic acid in a first heating process is 62.0 mJ/mg or greater. (2) The crystallization temperature of the poly-L-lactic acid in a cooling process is 90°C or higher. (3) The heat of fusion per unit mass of the poly-L-lactic acid in a second heating process is 51.0 mJ/mg or greater. (4) The heat of fusion per unit mass of the biodegradable resin in the second heating process is 60.5 mJ/mg or greater.
Inventors:
UTSUMI KEISUKE (JP)
SUGIYAMA TAKASHI (JP)
SEKIGUCHI YURIA (JP)
SUGIYAMA TAKASHI (JP)
SEKIGUCHI YURIA (JP)
Application Number:
PCT/JP2023/030983
Publication Date:
February 29, 2024
Filing Date:
August 28, 2023
Export Citation:
Assignee:
DAIWA SPINNING CO LTD (JP)
International Classes:
D01F8/14; D01D5/098
Domestic Patent References:
| WO2013129240A1 | 2013-09-06 |
Foreign References:
| JP2000265333A | 2000-09-26 | |||
| KR20050068593A | 2005-07-05 | |||
| JPH0941223A | 1997-02-10 | |||
| JPH09217232A | 1997-08-19 |
Attorney, Agent or Firm:
IKEUCHI & PARTNERS (JP)
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