METHOD FOR PRODUCING FUNCTIONAL POLYIMIDE FINE PARTICLE, ANDREWRITABLE MEMORY MATERIAL UTILIZING CHANGE IN FLUORESCENCE CHARACTERISTICSCAUSED BY LIGHT IRRADIATION OR HEAT TREATMENT

摘要

A rewritable optical memory material obtained by combining a polymer carryin g 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. Th e 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 su ch as fluorescence characteristics, magnetic characteristics, coloration or nonlinear characteristics are also disclosed, and particularly a fine partic le material imparted with heat resistance through combination with polyimide is disclosed.