Fibrous cellulose and method for manufacturing the same, and fibrous cellulose composite resin and method for manufacturing the same

A fibrous cellulose composite resin,

• which is a kneaded product of a fibrous cellulose having an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, and a resin.

A fibrous cellulose composite resin comprising

• a fibrous cellulose having an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid.

A method for manufacturing a fibrous cellulose, comprising

• defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%.

A method for manufacturing a fibrous cellulose composite resin, comprising

• kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0% with a resin.

A method for manufacturing a fibrous cellulose composite resin, comprising

• kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid to modify the fibrous cellulose with the polybasic acid during this kneading.

A method for manufacturing a fibrous cellulose composite resin, comprising

• kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid to obtain a fibrous cellulose composite resin containing the polybasic acid.