| 摘要 |
<p>There is provided a biaxially stretched polyester film comprising a polyester layer (layer A) which comprises polybutylene terephthalate and at least one of a copolyester and an amorphous polyester, said biaxially stretched polyester film satisfying any one of the following requirements: (1) the polyester layer (layer A) exhibiting one melting point as measured by temperature-rise DSC method, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof; and (2) an average number of uncompatilized polybutylene terephthalate masses having a maximum length of not less than 1 µm which are present in a section of the layer A is not more than 1.0 per 100 µm 2 of the section of the layer A, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof. The polyester film of the present invention exhibits a less deviation in thickness as well as a good hand cut-off property, and can be suitably used as a packing material for industrial materials, drugs, sanitary materials, foods, etc.</p> |
