Modifier of cellulose fibers and modification method of cellulose fibers

A method of modifying refined solvent-spun cellulose fibers, wherein fibrillation of the refined cellulose fibers is prevented, the method comprising:

• bringing a fixing amount of compound A, expressed by the following chemical formula
• wherein R denotes an organic group selected from the group consisting of a hydrocarbon group, an alkanolamine group, an aromatic group and a polyoxyalkylene adduct;
• m denotes a positive integer of 0 to 3 and can be represented by a plurality of values;
• and k denotes a positive integer of 2 to 6,
• into contact with cellulose fibers in an aqueous phase in the presence of an alkali metal compound, wherein an added amount of the alkali metal compound is 1.1 to 2.5 times moles with respect to the molecular number of the chlorohydrin group positioned at the terminal end of the compound A resulting in;
• chemically bonding compound A to the refined cellulose fibers such that they are covalently bonded to one another;
• and,
• crosslinking the refined cellulose fibers by two or more chlorohydrin groups included in each molecule of the compound A at the molecular structure level.