DEPOLYMERIZATION METHOD FOR UNSATURATED POLYESTER RESIN, METHOD FOR RECOVERING RAW MATERIAL FOR CROSSLINKING OF UNSATURATED POLYESTER RESIN USING THE DEPOLYMERIZATION METHOD, METHOD FOR PRODUCING UNSATURATED POLYESTER RESIN CROSSLINKED USING THE RAW MATERIAL FOR CROSSLINKING, AND CROSSLINKED UNSATURATED POLYESTER RESIN

摘要

PROBLEM TO BE SOLVED: To provide a depolymerization method for an unsaturated polyester resin capable of producing the raw material for an unsaturated polyester resin suitable for reutilization.SOLUTION: Provided is a depolymerization method for an unsaturated polyester resin comprising a process where, using alcohol having unsaturated bonds, preferably, allyl alcohol and/or ethylene glycol monoallyl ether as a reaction solvent, in the presence of the reaction solvent, an unsaturated polyester resin is irradiated with microwaves so as to be depolymerized in the presence of the reaction solvent, under the condition of pressure which is higher than ordinary pressure but which does not make the reaction solvent into a supercritical or subcritical state. The reaction product obtained by the depolymerization method is reacted with un-crosslinked unsaturated polyester raw material to produce a crosslinked(cured) unsaturated polyester resin.SELECTED DRAWING: Figure 1