CN-122029314-A - Fiber and nonwoven fabric

Abstract

Disclosed is a fiber containing a poly (3-hydroxyalkanoate) resin, which is suppressed in melt adhesion during fiber production and which can be thermally fused under low-temperature conditions during thermal processing of a fiber containing a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit. The present invention provides a fiber or the like having a core-sheath structure comprising a core portion and a sheath portion, wherein the core portion and the sheath portion each contain a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit, and the average molar content of the 3-hydroxybutyrate unit in the poly (3-hydroxyalkanoate) resin of the core portion is larger than the average molar content of the 3-hydroxybutyrate unit in the poly (3-hydroxyalkanoate) resin of the sheath portion.

Inventors

• Yurina Ino

Assignees

• 株式会社钟化

Dates

Publication Date

20260512

Application Date

20241010

Priority Date

20231025

Claims (10)

1. 1. A fiber having a core-sheath structure including a core portion and a sheath portion, wherein, The core and the sheath each contain a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit, The average molar content of 3-hydroxybutyrate units in the poly (3-hydroxyalkanoate) resin of the core part is greater than the average molar content of 3-hydroxybutyrate units in the poly (3-hydroxyalkanoate) resin of the sheath part.
2. 2. The fiber of claim 1 wherein, The fiber comprises: a copolymer (A) wherein the molar ratio of 3-hydroxybutyrate units to other hydroxyalkanoate unit monomers is 3-hydroxybutyrate units/other hydroxyalkanoate units=99/1 to 93/7, and And (B) a copolymer wherein the molar ratio of 3-hydroxybutyrate units to other hydroxy alkanoate unit monomers is 3-hydroxybutyrate units/other hydroxy alkanoate units=92/8 to 76/24.
3. 3. The fiber according to claim 2, wherein, The fiber contains 5 to 40% by weight of the copolymer (B) based on 100% by weight of the poly (3-hydroxyalkanoate) resin.
4. 4. The fiber according to claim 2 or 3, wherein, The sheath portion contains the copolymer (B).
5. 5. The fiber according to claim 4, wherein, The sheath portion includes the copolymer (a) and the copolymer (B).
6. 6. The fiber according to claim 1 to 3, wherein, The area ratio of the core part to the sheath part in the cross section of the fiber is core part/sheath part=8/2 to 2/8.
7. 7. The fiber according to claim 1 to 3, wherein, The poly (3-hydroxyalkanoate) resin is poly (3-hydroxybutyrate-co-3-hydroxycaproate).
8. 8. The fiber according to claim 1 to 3, wherein, The single fiber fineness of the fiber is 1-15 dtex.
9. 9. A method for producing a fiber, comprising melt-spinning a core-portion raw material composition and a sheath-portion raw material composition using a core-sheath type composite spinning nozzle to obtain the fiber according to any one of claims 1 to 3.
10. 10. A nonwoven fabric comprising the fiber of any one of claims 1 to 3.

Description

Fiber and nonwoven fabric Technical Field The present invention relates to fibers and nonwoven fabrics. Background In recent years, plastic waste has problems in that it has an influence on an ecological system, harmful gas is generated at the time of combustion, global warming is caused by a large amount of combustion heat, and the like, which are causes of great burden on the global environment. As a method capable of solving this problem, development of biodegradable plastics is becoming more and more popular. In such biodegradable plastics, carbon dioxide generated when the biodegradable plastics obtained by using plant-derived raw materials are burned is originally present in the atmosphere, and thus the carbon dioxide in the atmosphere is not increased. This is called carbon neutralization, and is considered to be a positive use in the frame of the kyoto protocol in which a target value for carbon dioxide emission reduction is set. Recently, from the viewpoints of biodegradability and carbon neutralization, aliphatic polyester resins, in particular polyhydroxyalkanoate) resins have been attracting attention as biodegradable plastics produced by microorganisms using plant-derived raw materials as carbon sources. Patent document 1 discloses a biodegradable conjugate fiber comprising a poly (. Beta. -hydroxyalkanoate) or a copolymer thereof as a core component and poly (. Epsilon. -caprolactone and/or poly (. Beta. -propiolactone) as a sheath component. Patent document 2 discloses a foam-defibration molded article comprising the following copolymer (a) and copolymer (B). (A) A copolymer comprising the following structural units (a 1) and (a 2) in the following ratio (the total of (a 1) and (a 2) is set to 100 mol%) (A1) 3-hydroxybutyrate structural units 92 Mol% or more and 98 mol% or less (A2) Structural unit shown in [ (O-R1-CO- ]) 2 Mol% or more and 8 mol% or less (R1 represents a linear or branched alkyl group having 3 to 17 carbon atoms.) (Wherein the structural unit (a 2) does not contain a 3-hydroxybutyrate structural unit.) (B) A copolymer comprising the following structural units (b 1) and (b 2) in the following ratio (the total of (b 1) and (b 2) is set to 100 mol%) (B1) 3-hydroxybutyrate structural units 85 Mol% or more and less than 92 mol% (B2) Structural unit shown in [ (O-R2-CO- ]) More than 8 mol% and 15 mol% or less (R2 represents a linear or branched alkyl group having 3 to 17 carbon atoms.) (Wherein the structural unit (b 2) does not contain a 3-hydroxybutyrate structural unit.) Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 5-93318 Patent document 2 Japanese patent application laid-open No. 2023-49669 Disclosure of Invention Problems to be solved by the invention However, conventional fibers may be melt-bonded during production or may not be sufficiently heat-welded under low-temperature conditions during heat processing, and thus it is difficult to perform heat processing. Accordingly, an object of the present invention is to provide a fiber containing a poly (3-hydroxyalkanoate) resin, which is suppressed in melt-bonding during production of the fiber and which can be thermally welded under low-temperature conditions during thermal processing of the fiber, and a nonwoven fabric comprising the fiber, wherein the fiber contains a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit. Means for solving the problems The present invention relates to a fiber having a core-sheath structure including a core portion and a sheath portion, The core and the sheath each contain a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit, The average molar content of 3-hydroxybutyrate units in the poly (3-hydroxyalkanoate) resin of the core part is greater than the average molar content of 3-hydroxybutyrate units in the poly (3-hydroxyalkanoate) resin of the sheath part. The present invention also relates to a method for producing a fiber, which comprises melt-spinning a core-portion raw material composition and a sheath-portion raw material composition using a core-sheath type composite spinning nozzle to obtain the fiber. The invention also relates to a nonwoven fabric comprising the fibers. ADVANTAGEOUS EFFECTS OF INVENTION According to the present invention, there can be provided a fiber containing a poly (3-hydroxyalkanoate) resin, which is suppressed in melt-bonding during production of the fiber and which can be thermally welded under low-temperature conditions during thermal processing of the fiber, and a nonwoven fabric comprising the fiber, the fiber containing a poly (3-hydroxyalkanoate) resin containing a 3-hydroxybutyrate unit. Drawings Fig. 1 is a schematic view of a cross section of a single fiber of the present embodiment. Symbol description 1 Single fiber 10 Core part 20 Sheath portion Detailed Description An embodiment of the present invention will be described below with reference to the drawings. < Fiber of the pr