Multilayer, transparent, biaxially oriented polyester film, process for its production and its use
AssigneeMitsubishi Polyester Film GmbH
InventorsHerbert Peiffer, Gottfried Hilkert
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Abstract
The invention relates to a multilayer, transparent, biaxially oriented polyester film having at least one base layer B composed of a thermoplastic polyester, at least one overlayer A coextruded on the base layer B and at least one acrylic coating D which is applied to the film as an aqueous dispersion. The invention further relates to a process for producing the film and to its use.
Claims11
A coextruded, at least two-layer, transparent biaxially oriented polyester film with at least one base layer B which comprises at least 80% by weight of thermoplastic polyester, and with at least one overlayer A comprising polymer coextruded on the base layer B, and with at least one acrylic coating D, wherein
- a) fillers present in the base layer B are only those which are introduced into the base layer B by way of reground cut material;
- b) the overlayer A comprises an amount of from 500 to 2500 ppm of fillers, based on the weight of the overlayer A,
- c) the fillers are substantially composed of SiO2 with a median particle diameter d50 of from 10 to 60 nm and/or from 1.0 to 5 μm;
- and wherein
- d) at least the overlayer A has a continuous crosslinked acrylic coating D which is applied in the form of an aqueous dispersion to the film
- e) said film further exhibiting a coefficient of friction for the coated overlayer A against itself of less than 0.37.
Dependencies are inferred from the claim text.