Abstract:
PROBLEM TO BE SOLVED: To provide a suspension of cellulose fiber suitable as a material for manufacturing an oxygen gas barrier film. SOLUTION: The suspension of cellulose fiber includes cellulose fibers, a polyvalent metal, and a volatile base. The cellulose fibers have an average fiber diameter of ≤200 nm, and cellulose constituting the cellulose fiber has a carboxy group content of 0.1-2 mmol/g. This suspension is suitable as a material for manufacturing a film having oxygen gas barrier properties. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a cellulose nanofiber dispersion liquid, in which dispersibility of a cellulose nanofiber in a dispersion medium can be improved and the energy required to re-disperse the cellulose nanofiber in the dispersion medium can be saved.SOLUTION: The method for producing the cellulose nanofiber dispersion liquid comprises: a cellulose nanofiber production step (1) of producing the cellulose nanofiber from a carboxyl group-containing cellulose fiber to be obtained by oxidizing a natural cellulose fiber by using an oxidizer and an N-oxyl compound; a step (2) of mixing the produced cellulose nanofiber with a re-dispersion accelerator to obtain a gelatinized body; and a step (3B) of mixing the obtained gelatinized body, an organic liquid compound, and a dispersant to re-disperse the cellulose nanofiber.
Abstract:
PROBLEM TO BE SOLVED: To provide a cellulose composite capable of efficiently removing active oxygen species such as a fluoride ion and hydrogen peroxide, a method for producing the composite and a water treatment method using the composite.SOLUTION: The present invention provides: [1] a cellulose composite comprising a cellulose fiber and a metal oxyhydroxide, in which the cellulose fiber has an average fiber diameter of 1 to 200 nm; [2] a water treatment method comprising a step of bringing the cellulose composite into contact with water to be treated containing hydrogen peroxide or a fluoride ion; and [3] a method for producing the cellulose composite in which the cellulose fiber and a metal ion-containing aqueous solution are mixed and pH of the resulting solution is adjusted to be on an alkali side with an alkali agent.
Abstract:
PROBLEM TO BE SOLVED: To provide a material containing micro cellulose fibers having excellent dispersion stability in organic solvents, suitable for compounding with a plastic material and giving a composite material having high mechanical strength. SOLUTION: The composite body of the micro cellulose fiber is produced by adsorbing a surfactant to micro cellulose fibers having a carboxyl group content of 0.1-3 mmol/g. The liquid dispersion of the micro cellulose fiber contains the micro cellulose fiber composite body and an organic solvent. The surfactant is preferably a cationic surfactant and the organic solvent is preferably a polar solvent. The liquid dispersion of the micro cellulose fiber can be produced by a production process comprising addition of the surfactant to an aqueous dispersion of the micro cellulose fibers, dehydration and concentration of the aqueous dispersion to obtain a solid material containing the micro cellulose fibers, and dispersion of the solid material in a solvent containing the organic solvent. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a gas-barrier molded article having high permeation barrier properties against an oxygen gas, water vapor and the like. SOLUTION: The gas-barrier molded article has a cellulose fiber layer having a cross-linked structure formed on the surface of a molding serving as a base material. The cellulose fiber layer having the cross-linked structure is formed by the reaction of cellulose fibers and a cross-linking agent having a reactive functional group. The cellulose fibers contain cellulose fibers having an average fiber diameter of 200 nm or less, wherein cellulose that constitutes the cellulose fibers has a carboxy group content of 0.1 to 2 mmol/g. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a gas barrier material from which a formed body having high gas barrier properties against oxygen or the like can be obtained. SOLUTION: The gas barrier material contains cellulose fibers having an average fiber diameter of not larger than 200 nm. The cellulose constituting the cellulose fibers has a carboxyl group content of 0.1-2 mmol/g. By coating a base with the gas barrier material and drying the coated base, there can be obtained a gas barrier composite body having high oxygen barrier properties and the like. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a cellulose nanofiber, in which micronization of an oxidized cellulose fiber can be promoted by micronization treatment while restraining the oxidized cellulose fiber from becoming a short fiber and the energy required to perform micronization treatment can be saved.SOLUTION: The method for producing the cellulose nanofiber comprises: a step of oxidizing a natural cellulose fiber by using an oxidizer and an N-oxyl compound to obtain a carboxyl group-containing cellulose fiber; a step of adding an anionic cellulose derivative to the obtained carboxyl group-containing cellulose fiber; and a micronization step of performing the micronization treatment on the anionic cellulose derivative-added carboxyl group-containing cellulose fiber.
Abstract:
PROBLEM TO BE SOLVED: To provide a resin composition including fine cellulose fibers and a resin, having practically sufficient mechanical strengths, and entailing a scarce coloration of the resin.SOLUTION: The resin composition of the present invention comprises: a fine cellulose fiber composite provided by coupling, via amide bonds, hydrocarbon groups with fine cellulose fibers; and at least one type of resin selected from the group consisting of polyolefin-based resins, polyvinyl chloride-based resins, polyamide-based resins, and polycarbonate-based resins. It is desirable for the hydrocarbon group to be either a hydrocarbon group having one carbon atom or a saturated or unsaturated, linear or branched hydrocarbon group having at least 2 and no more than 30 carbon atoms.