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

• Main Authors: HORIE SHOJIRO, FUTAGOISHI OSAMU, IKENAGA KAZUTOSHI
• Format: Patent
• Language: English; Japanese
• Published: 22.06.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

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 【課題】再利用にとって好適な不飽和ポリエステル樹脂の原料を生成することのできる、不飽和ポリエステル樹脂の解重合方法を提供する。【解決手段】反応溶媒として、不飽和結合を持つアルコール、好ましくはアリルアルコールおよび／またはエチレングリコールモノアリルエーテルを用い、当該反応溶媒の存在下、常圧よりも高いが反応溶媒を超臨界もしくは亜臨界状態にしない圧力条件下で、不飽和ポリエステル樹脂にマイクロ波を照射して解重合する工程を含むことを特徴とする、不飽和ポリエステル樹脂の解重合方法。この解重合方法により得られる反応生成物を、未架橋の不飽和ポリエステル原料と反応させることにより、架橋（硬化）した不飽和ポリエステル樹脂を製造することができる。【選択図】図１