Patent ID: 11884754
Assignee: NATIONAL UNIVERSITY CORPORATION EHIME UNIVERSITY
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  D | IPC C  D

Claim 0:
1. A sulfonated fine cellulose fiber, which is a fine cellulose fiber obtained by fibrillating a cellulose fiber,
a part of hydroxyl groups of the fine cellulose fiber being substituted with sulfo groups,
an introduction amount of sulfur attributable to the sulfo groups being adjusted to be higher than 0.42 mmol/g,
the fine cellulose fiber having an average fiber width of 30 nm or less, and
a haze value of a dispersion liquid in which the fine cellulose fiber is dispersed in a water-soluble solvent so that the solid concentration is 0.2% by mass to 0.5% by mass being 30% or less,
wherein the fine cellulose fiber has a viscosity of 10,000 mPa·s or more in a state where the fine cellulose fiber is dispersed in a water-soluble solvent so that the solid concentration is 0.5% by mass.