US 11,884,754 B2
Sulfonated pulp fibers, derivative pulp, sulfonated fine cellulose fibers, method for producing sulfonated fine cellulose fibers, and method for producing sulfonated pulp fibers
Shou Hiasa, Ehime (JP); Hiromi Uchimura, Ehime (JP); and Tomoki Yabutani, Ehime (JP)
Assigned to MARUSUMI PAPER CO., LTD., Ehime (JP); and NATIONAL UNIVERSITY CORPORATION EHIME UNIVERSITY, Ehime (JP)
Appl. No. 17/050,131
Filed by MARUSUMI PAPER CO., LTD., Ehime (JP); and NATIONAL UNIVERSITY CORPORATION EHIME UNIVERSITY, Ehime (JP)
PCT Filed Apr. 24, 2019, PCT No. PCT/JP2019/017492
§ 371(c)(1), (2) Date Oct. 23, 2020,
PCT Pub. No. WO2019/208656, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 2018-084214 (JP), filed on Apr. 25, 2018; application No. 2018-084215 (JP), filed on Apr. 25, 2018; application No. 2018-209556 (JP), filed on Nov. 7, 2018; and application No. 2018-209557 (JP), filed on Nov. 7, 2018.
Prior Publication US 2021/0139612 A1, May 13, 2021
Int. Cl. C08B 5/14 (2006.01); D21H 11/20 (2006.01)
CPC C08B 5/14 (2013.01) [D21H 11/20 (2013.01)] 5 Claims
 
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.