| abstract |
A cellulose derivative which has a suitable elastic modulus and viscosity when it is dissolved in water and is useful as an adhesion barrier. n The cellulose derivative has a molecular weight of 5×10 3 to 5×10 6 and is composed of a repeating unit represented by the following formula (1): n n n n n n n n n n wherein R 1 , R 2 and R 3 are each independently selected from the group consisting of the following formulas (a), (b), (c) and (d) in predetermined amount: n n n n n n n n n n (X in the formula (c) is an alkali metal, and R 4 and R 5 in the formula (d) are each independently an alkyl group or alkenyl group having 10 to 28 carbon atoms). |