Composite for cellulose fiber dispersion and cellulose fiber composition

A nanocellulose dispersion liquid composition comprising:

• a composite for nanocellulose dispersion,
• nanocellulose having a diameter of 500 nm or less, and
• a resin solution,
• the composite having a structure in which a vinyl polymer is grafted to a reactive cellulose derivative into which 20 or less polymerizable unsaturated groups and/or thiol groups on average per molecule of the cellulose derivative are introduced by utilizing an unmodified hydroxy group of the cellulose derivative, the polymerizable unsaturated groups and/or thiol groups serving as starting points,
• wherein a weight ratio of the nanocellulose to the composite ranges from 1:0.01 to 1:10, and
• wherein the cellulose derivative is at least one selected from the group consisting of methylcellulose, ethylcellulose, butylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxybutylmethylcellulose, carboxymethylcellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cellulose triacetate, nitrocellulose, and cationic cellulose.