film ecoloju sep manufactured by mitsubishi plastics industries ltd 100 lactic acid polymer thickness 25 u03bcm was used as a base material film this film was used as a surface protection film one side of the base material film described in example 1 was subjected to a corona treatment thereafter a backside treatment agent was applied to the untreated side of the film with a 9 wire wound bar and the coating was dried at 80 u00b0 c for 1 minute to form a backside treatment layer as the backside treatment agent was used a solution prepared by dissolving an alkylcarbamate type release agent peel oil 1010 manufactured by ipposha oil industries co ltd in toluene in a solid content of 0 3 by weight subsequently an antistatic agent was applied to the corona treated side of the film with a 6 wire wound bar and the coating was dried at 80 u00b0 c for 1 minute to form a priming layer as the antistatic agent was used one containing an ionically conductive polymer bondeip manufactured by konishi co ltd i e one comprising 1 g of bondeip px main ingredient solid content about 32 1 g of bondeip px hardener solid content about 8 12 g of isopropyl alcohol and 6 g.