Transparent, sealable, UV-resistant polyester film, its use...

Details Transparent, sealable, UV-resistant polyester film, its use... Transparent, sealable, UV-resistant polyester film, its use...

2005-03-08

2005-03-08

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

C428S212000, C428S213000, C428S215000, C428S216000, C428S480000, C428S910000, C428S323000, C428S331000, C428S347000, C428S349000, C264S288400, C264S290200

Reexamination Certificate

active

06863954

ABSTRACT:
Biaxially oriented, coextruded polyester films with a base layer at least 90% by weight of which is composed of a thermoplastic polyester, preferably polyethylene terephthalate (PET), and with at least one sealable outer layer and a second nonsealable outer layer and, if desired, with other intermediate layers, and comprising at least one UV absorber, preferably hydroxybenzotriazoles and triazines, have high UV resistance, do not embrittle when exposed to high temperatures, have a surface without undesirable haze and are suitable for numerous indoor and outdoor applications. The outer layers comprise antiblocking agents, such as silica with an average particle diameter preferably below 50 nm and/or above 2 μm, and the sealable outer layer is preferably composed of a copolyester which has been built up from ethylene terephthalate units and ethylene isophthalate units.

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H. Day, D.M. Wiles:J. Appl Polym Sci 16, 1972, p. 203.

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