High-whiteness, biaxially oriented polyester film, its use...

Details High-whiteness, biaxially oriented polyester film, its use... High-whiteness, biaxially oriented polyester film, its use...

2005-04-26

2005-04-26

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Composite

Of polyester

C428S304400, C428S314400, C428S315500, C428S315900, C428S317900, C428S319300, C428S319700, C428S910000, C428S903300, C525S165000, C525S176000, C264S288400, C264S290200

Reexamination Certificate

active

06884517

ABSTRACT:
The present invention relates to a high-whiteness, biaxially oriented polyester film with at least a base layer made from polyester. The base layer of the polyester film of the invention also comprises from 2 to 60% by weight of a cycloolefin copolymer (COC), from 0.1 to 25% by weight of a white pigment, and, if desired, from 0 to 5% by weight of an optical brightener, based on the weight of the base layer. The glass transition temperature of the COC here is to be within the range from 70 to 270° C. The film is particularly suitable for packing foods or other consumable items which are sensitive to light and/or to air, or for use in industry, e.g. for producing hot-stamping foils or as a label film, or for image-recording papers, printed sheets, or magnetic recording cards, or for processing on high-speed machinery for winding, metallizing, printing or laminating.

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