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US 11,686,017 B2Granted
Liquid crystalline polyester fiber and method for producing the same
AssigneeKuraray Co., Ltd.
InventorsHiroki Tonosaki, Takashi Katayama, Junya Ide, Keiichi Ikehata
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Abstract
A liquid-crystal polyether fiber with high tensile strength has an ash content of 0.3 percent by weight or less, a degree of fusion (f) of 3 or less, and a tensile strength of 18 cN/dtex or more. The liquid-crystal polyether fiber has few residues of an anti-fusion agent and causes no fusion between filaments.
Claims10
A method for manufacturing a liquid crystalline polyester fiber, the method comprising:
- attaching a water-soluble alkali metal halide salt to a raw spun yarn of the liquid crystalline polyester fiber before performing a heat treatment,
- wherein the liquid crystalline polyester fiber has an ash content of 0.1% by weight or less and a degree of fusion (f) of 1.5 or less, and
- an amount of the water-soluble alkali metal halide salt attached to the raw spun yarn is 0.1% by weight or more and 4% by weight or less with respect to a total weight of the raw spun yarn.
A method for manufacturing a liquid crystalline polyester fiber, the method comprising:
- attaching an aqueous solution of a water-soluble alkali metal halide salt to a raw spun yarn of the liquid crystalline polyester fiber;
- drying the raw spun yarn to precipitate the solid alkali metal halide salt;
- and subsequently
- performing a heat treatment,
- wherein the liquid crystalline polyester fiber has an ash content of 0.1% by weight or less and a degree of fusion (f) of 1.5 or less, and
- an amount of the water-soluble alkali metal halide salt attached to the raw spun yarn is 0.1% by weight or more and 4% by weight or less with respect to a total weight of the raw spun yarn.
3 more elements
Dependencies are inferred from the claim text.