Title:
COMPOSITE FIBER, METHOD FOR PRODUCING SAME, AND FIBER STRUCTURE INCLUDING SAME
Document Type and Number:
WIPO Patent Application WO/2022/181788
Kind Code:
A1
Abstract:
The present invention relates to a composite fiber including a first component containing poly-L-lactic acid with an optical purity of 95% or more and a second component that contains an aliphatic polyester comprising a glycol and dicarboxylic acid, wherein the crystallization temperature of the second component in a cooling step is 78ºC or more and the heat of fusion per unit mass of the second component is 73.5 mJ/mg or less in a second heating step in a DSC curve obtained by differential scanning calorimetry (DSC). The composite fiber can be produced by performing melt spinning while the first component is at a temperature lower than that of the second component and stretching the result at a stretching rate of 1.4 times or more while at a temperature of 55ºC-90ºC. In this way, it is possible to provide a composite fiber that can be processed into a fiber structure having suitable flexibility and bulkiness, a method for producing the composite fiber, and a fiber structure including the composite fiber.
Inventors:
UTSUMI KEISUKE (JP)
YAMAMOTO SHOTA (JP)
YAMAMOTO SHOTA (JP)
Application Number:
PCT/JP2022/008018
Publication Date:
September 01, 2022
Filing Date:
February 25, 2022
Export Citation:
Assignee:
DAIWA SPINNING CO LTD (JP)
International Classes:
D01F8/14; D04H1/541
Foreign References:
| JP2006112012A | 2006-04-27 | |||
| JP2007119928A | 2007-05-17 | |||
| JP2007126780A | 2007-05-24 | |||
| JP2014037656A | 2014-02-27 | |||
| US20080287024A1 | 2008-11-20 | |||
| CN102560709A | 2012-07-11 | |||
| JP2006112012A | 2006-04-27 | |||
| JP2007119928A | 2007-05-17 | |||
| JP2007126780A | 2007-05-24 | |||
| JP2014037656A | 2014-02-27 |
Attorney, Agent or Firm:
IKEUCHI & PARTNERS (JP)
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