Ultrafine fibers and liquid fiber dispersion
AssigneeToray Industries, Inc.
InventorsKosuke Hamada, Norio Suzuki, Masato Masuda
Life of this patent
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Abstract
An ultrafine fiber has a fiber diameter (D) of 100 to 5000 nm, a ratio (L/D) of a fiber length (L) to the fiber diameter (D) of 3000 to 6000, and a carboxyl terminal group amount of 40 eq/ton or more. At least a part of a surface layer of the ultrafine fiber may be formed of polyester.
Claims13
-12. (canceled)
An ultrafine fiber having a fiber diameter (D) of 100 to 5000 nm, a ratio (L/D) of a fiber length (L) to the fiber diameter (D) of 3000 to 6000, and a carboxyl terminal group amount of 40 eq/ton or more.
A fiber dispersion liquid comprising ultrafine fibers having a fiber diameter of 100 to 5000 nm dispersed in an aqueous medium, wherein the fiber dispersion liquid has a solid content concentration of 0.01% to 10% by weight and a dispersion index of 20 or less, in which the dispersion index is measured by:
- preparing a fiber dispersion liquid such that a solid content concentration is 0.01% by weight with respect to a total amount of the fiber dispersion liquid, an image of the obtained fiber dispersion liquid at a magnification of 50 times is captured with a microscope under transmitted illumination, the image is converted into a monochrome image by using an image processing software, then a luminance histogram is formed with 256 grades, and a standard deviation obtained from the luminance histogram is used as the dispersion index.
Dependencies are inferred from the claim text.