Patent ID: 7858684

Claim:
A method of producing a solid composite material consisting of an organic matrix of fibrous organic polymers and crystalline fine particles of a metal carbonate dispersed in the organic matrix, the method comprising: preparing a liquid mixture by mixing in water hydrophilic nonionic polymers gelling in water and a metal ion source supplying one or more metal ions selected from Ca ion, Mg ion, Fe ion, Cu ion, Co ion, Mn ion, and Ni ion in water; preparing a gel solvent containing the organic matrix of nonionic polymer gel and the metal ion dispersed in the organic matrix by allowing the nonionic polymers in the liquid mixture to gel; and preparing the solid composite material in which the fine particles having an average diameter of 30 nm or less are dispersed in the organic matrix, by adding a carbonic acid source supplying carbonate ion in water to the gel solvent and thus precipitating crystalline fine particles of the metal carbonate in the organic matrix, wherein the hydrophilic nonionic polymers are selected from the group consisting of polyalkyloxides.