An organopolysiloxane-modified polysaccharide prepared by esterification
reacting (A) an organopolysiloxane having residual carboxylic anhydride
groups and (B) a polysaccharide having hydroxyl groups, wherein the
organopolysiloxane is bonded to the polysaccharide through half ester
groups, and a process for the preparation of organopolysiloxane-modified
polysaccharide, in which component (A) and component (B) are subjected to
an esterification reaction in the presence of (C) a non-protonic polar
solvent. The organopolysiloxane-modified polysaccharide comprising
polysaccharide and organopolysiloxane bonded thereto through half ester
groups is novel. The process for the preparation of
organopolysiloxane-modified polysaccharide permits introduction of
organopolysiloxane into polysaccharide at a high introduction ratio.