METHOD FOR PRODUCING FUNCTIONAL POLYIMIDE FINE PARTICLE, AND REWRITABLE MEMORY MATERIAL UTILIZING C

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A rewritable optical memory material obtained by combining a polymer carrying a carbonyl group in the main chain or a side chain with a function-imparting component such as a compound which produces rare earth ions is disclosed. The fluorescence intensity of the rewritable optical memory material can be enhanced by light irradiation, while the initial state can be recovered through a heat treatment. Fine particle materials imparted with functions such as fluorescence characteristics, magnetic characteristics, coloration or nonlinear characteristics are also disclosed, and particularly a fine particle material imparted with heat resistance through combination with polyimide is disclosed.