Biodegradable hydrophilic crosslinked polymer, process for producing it, and uses thereof

摘要

The invention provides biodegradable crosslinked polymers, which have a chelating effect and a dispersing effect to disperse an oily substance and an inorganic substance hardly soluble in water and are excellent in dispersion into water. The crosslinked polymers comprise; an ingredient of molecular weight 5,000 or less in 50% by weight, a bond having at least one of a group (II) represented by the chemical formula -CO-O- and a group (III) represented by the chemical formula -CO-NH- as a composition unit between main chains having a water-soluble oligomer structure having the functional group (I) represented by the general formula -COOM (here, M denotes anyone of a hydrogen atom, monovalent metal, divalent metal, trivalent metal, an ammonium group and organic amine group.), and showing a viscosity of 1,000 cP or less at 20 degrees C. by a 20% by weight aqueous solution of the crosslinked polymer.