| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a biaxially stretched laminated film having biodegradability, transparency, flexibility and heat fusibility. <P>SOLUTION: The base material layer I of a biaxially stretched film comprises an aliphatic polyester copolymer A of which the molecular chain comprises a repeating unit represented by general formula (1):-CO-R<SP>1</SP>-CO- (wherein R<SP>1</SP>is a 1-12C divalent aliphatic group), a repeating unit represented by general formula (2):-O-R<SP>2</SP>-O- (wherein R<SP>2</SP>is a 2-12C divalent aliphatic group) and a repeating unit represented by general formula (3):-CO-R<SP>3</SP>-O- (wherein R<SP>3</SP>is a 1-10C divalent aliphatic group) and is characterized in that the repeating unit represented by general formula (3) is 1-30 mol%. A coating layer II of a polyester composition (D), which comprises 70-20 wt.% of the aliphatic polyester copolymer A and 30-80 wt.% of an aromatic polyester copolymer E of which the molecular chain comprises a repeating unit represented by general formula (4):-CO-R<SP>4</SP>-CO- (wherein R<SP>4</SP>is a 0-8C divalent aliphatic group), a repeating unit represented by general formula (5):-CO-R<SP>5</SP>-CO- (wherein R<SP>5</SP>is an 8-12C divalent aromatic group) and a repeating unit represented by general formula (6):-O-R<SP>6</SP>-O- (wherein R<SP>6</SP>is a 2-12C divalent aliphatic group) and is characterized in that the unit 4 is 20-95 mol% and the unit 5 is 80-5 mol%, is provided on at least one side of the base material layer I. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
