Polymeric films
AssigneeTrespaphan GmbH
InventorHelen Ann Biddiscombe
Life of this patent
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Abstract
Biaxially oriented polymeric films having a core layer of a voided propylene homopolymer with a density of not more than 0.70 g/cm3, and at least one substantially non-voided layer on each surface of the core layer, the ratio of the combined thicknesses of the non-voided layers on the respective surfaces of the core layer being from 2:1 to 1:1. Films in accordance with the present invention have low curl, particularly after having been printed.
Claims8
A biaxially oriented co-extruded polymeric film which consists of a plurality of co-extruded layers, an optional adhesive layer applied to one surface of said co-extruded biaxially oriented film and optional printing on an exposed surface of said film;
- said co-extruded layers including a core layer of a voided propylene homopolymer which has a density of not more than 0.70 g/cm3, at least one substantially nonvoided layer of polyolefin co-extruded onto a first side of said core layer, and at least one substantially non-voided layer of polyolefin co-extruded onto a second side of said core layer;
- with the proviso that the ratio of the combined thickness of the non-voided layers on the respective surfaces of the core layer is from 2:1 to 1:1.
Dependencies are inferred from the claim text.