| abstract |
(57) [Abstract] [Purpose] To provide a biodegradable cross-linked polymer having a chelating function and a function of dispersing an oily substance or an inorganic substance that is poorly soluble in water, having good dispersibility in water. .. The cross-linked polymer of the present invention contains 50% by weight or more of a component having a molecular weight of 5000 or less, and has the general formula —COO M [Here, M represents any one of hydrogen, monovalent metal, divalent metal, trivalent metal, ammonium group and organic amine group. ] Between main chains which consist of a water-soluble oligomer having a functional group (I) represented by the following formula-CO-O- A group (II) represented by the formula (II) and a group (III) represented by the chemical formula —CO—NH— as a structural unit, and a bond is formed, and a 20% by weight aqueous solution has a temperature of 20 ° C. Has a viscosity of 1000 cP or less. |