Material for fiber manufacturing and fiber

A technology of fiber and liquid crystal polyester, which is applied in the field of fiber manufacturing materials and fibers, can solve problems such as viscosity increase, achieve high fiber strength, and improve fiber strength

Active Publication Date: 2013-06-05
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing liquid crystal polyester sometimes has a large increase in viscosity when it is in a molten state for a long time

Method used

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  • Material for fiber manufacturing and fiber
  • Material for fiber manufacturing and fiber
  • Material for fiber manufacturing and fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0147] The present invention is illustrated by examples below, but the present invention is not limited to these examples.

[0148] [Melt Viscosity]

[0149] Melt viscosity is measured by using a flow characteristic tester (Capirograph) 1B manufactured by Toyo Machinery Seisakusho Co., Ltd., using a nozzle with a hole diameter of 0.5 mm and a shear rate of 1000 s for each measurement temperature. －1 conditions are measured.

[0150] [Flow start temperature]

[0151] The flow initiation temperature of the liquid crystal polyester, which is a raw material for fiber production, was measured using a flow characteristic evaluation device "Flow Tester CFT-500" manufactured by Shimadzu Corporation. Fill about 2 g of the sample into a capillary rheometer equipped with a die with an inner diameter of 1 mm and a length of 10 mm. 2 ) under a load of 4°C / min to extrude the liquid crystal polyester from the nozzle, the temperature at which the melt viscosity was 4800 Pa·s (48000 poise) ...

Embodiment 2

[0198] The liquid crystal polyester (A)-2-1 was pelletized in the same manner as in Example 1.

[0199] The obtained pellets had a melt viscosity of 35 Pa·s at 350° C. when measured under the above conditions. Generally, as the temperature increases, the melt viscosity of liquid crystal polyester decreases. Therefore, when the melt viscosity of liquid crystal polyester (A)-2-1 is measured at 360°C, a value lower than 35 Pa·s obtained as the above measurement result can be obtained. Value of melt viscosity. That is, it can be seen that the melt viscosity measured at 360° C. of the liquid crystal polyester (A)-2-1 is 70 Pa·s or less.

[0200] Using the obtained pellets, spinning was carried out in the same manner as in Example 1, and the tensile strength of the heat-treated yarn was measured.

[0201]

[0202] The liquid crystal polyester (A)-3-1 was pelletized in the same manner as in Example 1.

[0203] The obtained pellets had a melt viscosity of 35 Pa·s at 350° C. when ...

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Abstract

Disclosed is a material for fiber manufacturing comprising a liquid crystal polyester satisfying the following requirements (a) and (b), wherein (a) the weight-average molecular weight is equal to or less than 30000 and the polydispersity is equal to or less than 2.5; and (b) the melt viscosity measured at 360 DEG C. with conditions of a nozzle pore diameter of 0.5 mm and a shear velocity of 1000 s-1 using a flow feature testing machine is equal to or less than 70 Pas.

Description

technical field [0001] The present invention relates to materials and fibers for fiber manufacture. this application claims priority based on Japanese Patent Application No. 2011-253883 for which it applied to Japan on November 21, 2011, The content is used here. Background technique [0002] Liquid crystal polyesters are widely used as materials for electronic parts and the like because of their excellent low moisture absorption, heat resistance, and thin formability. In recent years, research has been conducted on making liquid crystal polyester into fibers by making full use of the characteristics of such liquid crystal polyester. [0003] When the liquid crystal polyester is formed into fibers, generally, the liquid crystal polyester is once melted, extruded through fine holes, and stretched to form it. At this time, the lower the viscosity of the liquid crystal polyester in the molten state, the finer fibers can be obtained, and the fiberization can be performed favor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60D01F6/84
CPCC08G63/605C08G63/60D01D1/04D01D5/08D01F6/84
Inventor 细田朋也前田光男冈本敏
Owner SUMITOMO CHEM CO LTD
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