Patent ID: 8569263

Claim:
A method of producing silane-modified cationized cellulose, comprising the steps of: (1) cationizing water-soluble cellulose ether in the presence of alkali in a mixed solvent of a water-compatible organic solvent and water to obtain a slurry comprising cationized cellulose; (2) adding acid to said slurry and neutralizing said alkali; (3) reacting said cationized cellulose obtained after said neutralization with an aminosilane compound which is 0.3-10% by mass relative to an amount of water-soluble cellulose ether used as raw material of said cationized cellulose; and (4) drying and powderizing the product obtained in step (3), wherein drying is conducted in step (4) at a temperature of 115-160° C. until weight loss on drying is 5% by weight or less, or the method further comprises the step (5) of adding a water-compatible organic solvent or a mixed solvent of a water-compatible organic solvent and water to said cationized cellulose obtained in step (2) so that the water content in the total solvent is 10% by mass or less before performing step (3).