METHOD FOR MODIFYING RESIN, RESIN COMPOSITION, MOLDED RESIN PRODUCT AND METHOD FOR RECOVERING RESOURCE

摘要

PROBLEM TO BE SOLVED: To provide an injection molded product of a biodegradable resin having durability, or a molded product of a polyester resin, and provide a method for recycling the resin by extracting plastic materials accumulated in microorganisms. SOLUTION: This method for modifying the resin is to add an effective amount of an alkali or an acid ingredient to neutralize acidic or alkaline components included in a high molecular material having ester bonds in high molecular main chains and mix them to practically maintain the resin to be neutral. This resin composition comprises the high molecular material having ester bonds in the high molecular main chains and the effective amount of the alkali or acid ingredient for neutralizing the acidic or alkaline component included in the high molecular material. This method for recovering resource is to degrade a biodegradable resin mold with microorganisms and recover the biodegradable resin accumulated in the microorganisms.