Transparent, sealable, flame-retardant polyester film,...

Details Transparent, sealable, flame-retardant polyester film,... Transparent, sealable, flame-retardant polyester film,...

2005-04-19

2005-04-19

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

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

C428S213000, C428S215000, C428S216000, C428S323000, C428S331000, C428S480000, C428S910000, C428S346000, C428S347000, C428S349000, C428S3550RA, C264S288400, C264S290200, C106S015050, C106S018110, C106S018180, C106S018310, C106S018140

Reexamination Certificate

active

06881470

ABSTRACT:
Biaxially oriented, co-extruded polyester films comprising a base layer consisting of at least 90 wt. % thermoplastic polyester, preferably polyethylene terephthalate (PET), at least one sealable outer layer and a second non-sealable outer layer and, optionally, other intermediate layers, in addition to at least one flame-retardant agent, preferably organic phosphorous compounds. The inventive films are characterized by low inflammability, no embrittlement when subjected to thermal stress and a surface which is devoid of troublesome opacity, and are suitable for a multiplicity of uses both indoors and outside. The outer layers contain anti-blocking agents such as silicic acid having a particle diameter of preferably less than 50 nm and/or more than 2 μm. Preferably, the sealable outer layer consists of a copolyester which is made of ethylene terephthalate and ethylene isophthalate units.

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