Abstract: A powder of modified cellulose fibers has an average fiber length of 1 ?m or more and 500 ?m or less, wherein the modified cellulose fibers are made from anionically modified cellulose fibers introduced at an anionic group with a modifying group. A dispersion contains a powder of modified cellulose fibers as defined above and a medium, wherein the powder of modified cellulose fibers is dispersed in the medium. A resin composition contains a powder of modified cellulose fibers as defined above and a resin, wherein the powder of modified cellulose fibers and the resin are blended. A resin molded article is obtained by molding a resin composition as defined above. A powder of cellulose fibers having excellent dispersibility in a solvent, which can be obtained by an inexpensive process, and a method for producing the same can be provided.

Abstract: A method for producing shortened anionically modified cellulose fibers having an average fiber length of 1 ?m or more and 500 ?m or less, the method including cleaving sugar chains of anionically modified cellulose fibers by thermal decomposition under temperature conditions of 50° C. or higher and 230° C. or lower, wherein the average fiber length of the anionically modified cellulose fibers is 700 ?m or more and 10000 ?m or less. By the use of shortened anionically modified cellulose fibers or the like obtained by the method for production of the present invention, a dispersion containing fine cellulose fibers having a low viscosity and excellent handling property can be prepared while at a high concentration, so that the dispersion can be suitably used in various industrial applications such as daily sundries, household electric appliance parts, packaging materials for household electric appliances, automobile parts, and materials for three-dimensional modeling.

Abstract: The present invention relates to a film comprising hydrophobically modified cellulose fibers in which cellulose fibers are bound to a modifying group at one or more members selected from anionic groups and hydroxyl groups, and an oil having an SP value of 10 or less. The film of the present invention can be utilized in the fields of materials for packaging containers for cosmetics and foods.

Abstract: The present invention relates to a film comprising hydrophobically modified cellulose fibers in which cellulose fibers are bound to a modifying group at one or more members selected from anionic groups and hydroxyl groups, and an oil having an SP value of 10 or less. The film of the present invention can be utilized in the fields of materials for packaging containers for cosmetics and foods.

Abstract: The present invention relates to a film comprising hydrophobically modified cellulose fibers in which cellulose fibers are bound to a modifying group at one or more members selected from anionic groups and hydroxyl groups, and an oil having an SP value of 10 or less. The film of the present invention can be utilized in the fields of materials for packaging containers for cosmetics and foods.

Abstract: The present invention relates to a powder of modified cellulose fibers having an average fiber length of 1 ?m or more and 500 ?m or less, wherein the modified cellulose fibers are made from anionically modified cellulose fibers introduced at an anionic group with a modifying group; a dispersion containing a powder of modified cellulose fibers as defined above and a medium, wherein the powder of modified cellulose fibers is dispersed in the medium; a resin composition containing a powder of modified cellulose fibers as defined in above and a resin, wherein the powder of modified cellulose fibers and the resin are blended; and a resin molded article obtained by molding a resin composition as defined above. According to the present invention, a powder of cellulose fibers having excellent dispersibility in a solvent, which can be obtained by an inexpensive process, and a method for producing the same can be provided.

Abstract: A rubber composition containing a rubber and modified cellulose fibers, wherein one or more substituents selected from substituents represented by the following general formulas (1) and (2): —CH2—CH(OH)—R1 (1), —CH2—CH(OH)—CH2—(OA)n—O—R1 (2), wherein each R1 in the general formulas (1) and (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms are bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure. The rubber composition of the present invention can be suitably used for machine tool parts, household electric appliance parts, automobile parts, and the like.

Abstract: A method for producing shortened anionically modified cellulose fibers having an average fiber length of 1 ?m or more and 500 ?m or less, the method including cleaving sugar chains of anionically modified cellulose fibers by thermal decomposition under temperature conditions of 50° C. or higher and 230° C. or lower, wherein the average fiber length of the anionically modified cellulose fibers is 700 ?m or more and 10000 ?m or less. By the use of shortened anionically modified cellulose fibers or the like obtained by the method for production of the present invention, a dispersion containing fine cellulose fibers having a low viscosity and excellent handling property can be prepared while at a high concentration, so that the dispersion can be suitably used in various industrial applications such as daily sundries, household electric appliance parts, packaging materials for household electric appliances, automobile parts, and materials for three-dimensional modeling.

Abstract: Modified cellulose fibers, wherein each of (A) one or more substituents selected from substituents represented by the following general formula (1) and substituents represented by the following general formula (2): —CH2—CH(OH)—R1 (1); —CH2—CH(OH)—CH2—(OA)n-O—R1 (2), wherein each R1 in the general formula (1) and the general formula (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms, and (B) a substituent represented by the following general formula (3): —CH2—CH(OH)—R2 (3), wherein R2 in the general formula (3) is an alkyl group having 1 or more carbon atoms and 2 or less carbon atoms, is independently bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure.

Abstract: The present invention relates to a film comprising hydrophobically modified cellulose fibers in which cellulose fibers are bound to a modifying group at one or more members selected from anionic groups and hydroxyl groups, and an oil having an SP value of 10 or less. The film of the present invention can be utilized in the fields of materials for packaging containers for cosmetics and foods.

Abstract: A resin composition containing a) a resin, and b) a cellulose fiber composite having a carboxy group in the cellulose molecule, wherein an aldehyde group content is 0.20 mmol/g or less, and wherein the cellulose fiber composite contains a modifying group bound to one or more members selected from a carboxy group and a hydroxyl group. The resin composition of the present invention can be suitably used in various industrial applications such as daily sundries, household electric appliance parts, and automobile parts.

Abstract: Modified cellulose fibers, wherein each of (A) one or more substituents selected from substituents represented by the following general formula (1) and substituents represented by the following general formula (2): —CH2—CH(OH)—R1 (1); —CH2—CH(OH)—CH2—(OA)n-O—R1 (2), wherein each R1 in the general formula (1) and the general formula (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms, and (B) a substituent represented by the following general formula (3): —CH2—CH(OH)—R2 (3), wherein R2 in the general formula (3) is an alkyl group having 1 or more carbon atoms and 2 or less carbon atoms, is independently bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure.

Abstract: A rubber composition containing a rubber and modified cellulose fibers, wherein one or more substituents selected from substituents represented by the following general formulas (1) and (2): —CH2—CH(OH)—R1 (1), —CH2—CH(OH)—CH2—(OA)n—O—R1 (2), wherein each R1 in the general formulas (1) and (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms are bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure. The rubber composition of the present invention can be suitably used for machine tool parts, household electric appliance parts, automobile parts, and the like.