| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a packaging film having biodegradability, heat fusion properties and drawing properties suitable for stretch packaging. <P>SOLUTION: An intermediate layer comprises an aliphatic/aromatic copolyester resin containing 30-80 mole% of an aliphatic monomer component and having a crystalline melting point of at least 100°C and an aliphatic copolyester resin comprising 35-49.99 mole% of an aliphatic or alicyclic diol unit of formula (1): -O-R<SP>1</SP>-O- (R<SP>1</SP>is a divalent aliphatic hydrocarbon group or a divalent alicyclic hydrocarbon group), 35-49.99 mole% of an aliphatic dicarboxylic acid unit of formula (2): -OC-R<SP>2</SP>-CO- (R<SP>2</SP>is a directly bonded or divalent aliphatic hydrocarbon group), and 0.02-30 mole% of an aliphatic oxycarboxylic acid unit of formula (3): -O-R<SP>3</SP>-CO- (R<SP>3</SP>is a divalent aliphatic hydrocarbon group) and having a crystalline melting point of at least 100°C as main components. Each surface layer on both sides of the intermediate layer comprises a polymer which is an aliphatic copolyester resin similar to the aliphatic copolyester resin of the intermediate layer and has a crystalline melting point of 90°C or below as a main component. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
