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

A fibrous cellulose composite resin comprising a fibrous cellulose and a resin, wherein

• the fibrous cellulose has an average fiber width of 0.1 μm or more and has a part or all of hydroxyl groups replaced with carbamate groups,
• a replacement ratio with the carbamate group is 1.0 mmol/g or more,
• a fine ratio is 30.8% or more, and
• an average fiber length is 0.16 to 0.95 mm.

A method for manufacturing a fibrous cellulose, the method comprising:

• subjecting a cellulose raw material and at least one of urea and a derivative of urea to a heat treatment to replace a part or all of hydroxyl groups of the cellulose raw material with carbamate groups;
• and
• defibrating the cellulose raw material within a range in which an average fiber width is 0.1 μm or more, wherein
• the heat treatment is performed such that a replacement ratio with the carbamate group is 1.0 mmol/g or more,
• the defibration is performed until a fine ratio reaches 30.8% or more, and
• an average fiber length of the fibrous cellulose is 0.16 to 0.95 mm.