| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resin composition which can industrially be supplied and has practical physical properties, and to provide an agricultural mulching film in which the biodegradability of an aliphatic polyester-based component is inhibited, and the like. <P>SOLUTION: This biodegradable resin composition comprises an aliphatic polyester copolymer (a), carbon black, and, if necessary, another biodegradable resin (b). The aliphatic polyester copolymer (a) has a molecular chain comprising repeating units represented by the general formula (1): -CO-R<SP>1</SP>-CO- (1) (R<SP>1</SP>is a 1 to 12C divalent aliphatic group), repeating units represented by the general formula (2): -O-R<SP>2</SP>-O- (2) (R<SP>2</SP>is a 2 to 12C divalent aliphatic group), and, if necessary, repeating units represented by the general formula (3): -CO-R<SP>3</SP>-O- (3) (R<SP>3</SP>is a 1 to 10C divalent aliphatic group), and has a weight-average mol.wt. of ≥40,000. The agricultural biodegradable mulching film whose biodegradability is inhibited is obtained by molding the biodegradable resin composition. The method for inhibiting the biodegradability of the agricultural biodegradable mulching film is characterized by increasing or decreasing the amount of carbon black added to the film. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
