EP2108661A1 — Metal salt of crosslinked cellulose derivative

USPTO Abstract

The invention provides a metal salt of a crosslinked cellulose derivative represented by the following formula (I), wherein the degree of substitution of the hydroxyl group of glucose unit of the crosslinked cellulose derivative by a functional group a is 1 or more.         R-O-A     (I) {In the formula (I), R represents a crosslinked cellulose residue and A represents a functional group a having cation-exchange ability.}