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OwnerHerbert Peiffer, Holger Kliesch +2inventors
InventorsHerbert Peiffer, Holger Kliesch, Gottfried Hilkert, Cynthia Bennett
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The invention relates to a white, sealable, thermodeformable, biaxially oriented and coextruded polyester film that comprises at least one base layer B and at least one sealable cover layer A, wherein at least the base layer B contains a polyester starting compound and a cycloolefin copolymer (COC). The polyester starting compound should contain an increased amount of diethylene glycol, polyethylene glycol or isophthtalic acid. The invention further relates to a method for producing the inventive polyester film and to the use thereof for thernoformed articles, especially on high-speed machines.
A white, sealable, biaxially oriented, thermoformable and coextruded polyester film encompassing at least one base layer B and at least one sealable outer layer A, both composed of thermoplastic polyester, wherein at least the base layer B also comprises, besides polyester, an amount in the range from 2 to 60% by weight of a cycloolefin copolymer (COC), based on the weight of the base layer B, where the glass transition temperature Tg of the cycloolefin copolymer (COC) is in the range from 70 to 270° C., and wherein the polyester contains an increased amount of diethylene glycol and/or polyethylene glycol and/or isophthalic acid.
The process as claimed in claim 13, wherein cut material arising directly during production of the film is reused for film production in the form of regrind in an amount in the range from 10 to 70% by weight, based on the total weight of the film.
Dependencies are inferred from the claim text.