a method for recovering an uncrosslinked synthetic resin waste including dissolving the uncrosslinked synthetic resin waste in a solvent containing , as an active ingredient , one or more oxyisobutyric acid esters selected from an alkyl α - alkoxyisobutyrate , an alkyl β - alkoxyisobutyrate and an alkyl α - hydroxyisobutyrate . this invention provides a method for recovering a plastic waste by using a highly safe solvent which is free from the problems encountered in the conventional methods with the use of aromatic hydrocarbons or halogenated hydrocarbons , and comprises non - halogen solvents , forms no substance causing environmental problems , has a high ability to dissolve plastic wastes , has neither toxicity nor any offensive odor , is not accumulated in nature because of its high biodegradability , and has a relatively high boiling point .