Patent ID: 11945884
Assignee: OJI HOLDINGS CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  D | IPC C

Claim 0:
1. A method of producing fibrous cellulose, the method comprising:
introducing phosphoric acid groups or substituents represented by the following formula (1) or (3), or phosphorous acid groups or substituents represented by the following formula (2) into cellulose fibers:, in the formula (1), a and b are natural numbers, and m is an arbitrary number, and a=b×m;
βb+ is a monovalent or higher cation composed of an organic substance or an inorganic substance;
a of α and α′ are O−, and the rest are OR,
R is a hydrogen atom, a saturated-linear hydrocarbon group, a saturated-branched hydrocarbon group, a saturated-cyclic hydrocarbon group, an unsaturated-linear hydrocarbon group, an unsaturated-branched hydrocarbon group, an unsaturated-cyclic hydrocarbon group, or an aromatic group,, in the formula (3), a and b are natural numbers, m is an arbitrary number, n is a natural number of 2 or more, and a=b×m;
βb+ is a monovalent or higher cation composed of an organic substance or an inorganic substance;
a of α1, α2, . . . , αn and α′ are O−, and the rest are either R or OR,
R is a hydrogen atom, a saturated-linear hydrocarbon group, a saturated-branched hydrocarbon group, a saturated-cyclic hydrocarbon group, an unsaturated-linear hydrocarbon group, an unsaturated-branched hydrocarbon group, an unsaturated-cyclic hydrocarbon group, or an aromatic group,, in the formula (2), b is a natural number, m is an arbitrary number, and b×m=1;
βb+ is a monovalent or higher cation composed of an organic substance or an inorganic substance;
α is a hydrogen atom, a saturated-linear hydrocarbon group, a saturated-branched hydrocarbon group, a saturated-cyclic hydrocarbon group, an unsaturated-linear hydrocarbon group, an unsaturated-branched hydrocarbon group, an unsaturated-cyclic hydrocarbon group, or an aromatic group,
obtaining the fibrous cellulose having a fiber width of 1,000 nm or less by performing a defibration treatment on cellulose fibers; and
performing a thixotropy reduction treatment on the fibrous cellulose,
wherein the performing of the thixotropy reduction treatment is selected from the group consisting of setting a degree of polymerization of the fibrous cellulose to 300 or more and 500 or less, an ozone treatment step, an enzyme treatment step, a hypochlorous acid treatment step, and a sub-critical water treatment step.