Multilayered polyester film and process for producing the same

Details Multilayered polyester film and process for producing the same Multilayered polyester film and process for producing the same

2007-07-03

2007-07-03

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S213000, C428S480000, C428S910000, C264S173110, C264S173120, C264S173150, C264S280000, C264S288400, C264S290200, C528S302000, C528S307000, C528S308000, C528S308600, C528S308700

Reexamination Certificate

active

10505048

ABSTRACT:
The present invention is a multilayer polyester film comprising a layer A and a layer B which are laminated alternately, the layer A constituting the outermost layer on both sides of the film, wherein (1) the layer A comprises a polyester A, and the layer B comprises a polyester B, (2) the melting point of the polyester A is higher than the melting point of the polyester B by at least 15° C., (3) the layer A is a layer having an oriented structure, and the layer B is a layer having a substantially unoriented structure, (4) the ratio (a/b) of the total thickness (a) of the layer A to the total thickness (b) of the layer B is 0.01 to 3, and (5) the in-plane tensile strength of the multilayer polyester film is 50 MPa or lower at a maximum, and the difference between its maximum value and minimum value is 20 MPa or smaller; and a method for producing the multilayer polyester film. According to the present invention, there is provided a film having excellent isotropy of in-plane tensile strength, excellent transparency, a low degree of thickness unevenness and excellent moldability.

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patent: 2002-096438 (2002-04-01), None
patent: 2002-096439 (2002-04-01), None

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