Biaxially oriented polyester film, the use thereof, and process for the production thereof
AssigneeHoechst Diafoil GmbH
InventorsHerbert Peiffer, Gottfried Hilkert, Werner Roth
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Abstract
The invention relates to a biaxially oriented polyester film which has very good optical properties and good processing behavior and which after it has been metallized or coated with oxidic materials exhibits a high oxygen barrier and which is built up from at least one base layer B and at least one layer A applied on top of this base layer, this layer A having a defined number of elevations of defined height and diameter. The invention also relates to the use of the film and a process for the production thereof.
Claims17
A biaxially oriented, coextruded polyester film having a base layer B composed to an extent of at least 80% by weight of a thermoplastic polyester and one or more further layers, where at least one outer layer A contains internal and/or inert particles and where this outer layer has a number of elevations/protrusions N per mm2 of film surface area which is related to their respective heights h and diameters d by the following equations
- log N/mm2<Ah−Bh*log h/μm, (1)
- 0.01 μm<h<10 μm
- Ah=1.4;
- Bh=2.5
- log N/mm2<Ad−Bd*log d/μm, (2)
- 0.4 μm<d<10 μm
- Ad=3.4;
- Bd=2.4.
Dependencies are inferred from the claim text.