Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2006-05-16
2010-11-16
Chen, Vivian (Department: 1787)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S323000, C428S327000, C428S334000, C428S336000, C428S339000, C428S480000, C428S910000, C525S437000
Reexamination Certificate
active
07833614
ABSTRACT:
The present invention relates to a biaxially stretched polyester film comprising a polyester 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 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 μm2of 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.
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Sato Akira
Suzuki Takashi
Chen Vivian
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Mitsubishi Polyester Film Corporation
Neuner George W.
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