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US 6,787,222 B2Granted
Polymeric films
AssigneeTrespaphan GmbH
InventorHelen Ann Biddiscombe
Life of this patent
Estimating the term…
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.
Claims23
A label made from a co-extruded polymeric film;
- said label containing an adhesive thereon;
- said film being a biaxially oriented co-extruded polymeric film comprising an extruded core layer of a voided propylene homopolymer having a density of not more than 0.70 g/cm3, one or more substantially non-voided layers co-extruded on one surface of the core layer and one or more substantially non-voided layers co-extruded on another surface of the core layer, wherein said one or more co-extruded non-voided layers on one surface of the core layer have a combined thickness and said one or more co-extruded non-voided layers on the other surface of the core layer have a combined thickness such that the combined thickness on one surface of the core layer and the combined thickness on the other surface of the core layer are in a ratio of from 2:1 to 1:1;
- with the provisos that said polymeric film has an overall thickness of at least 30 microns and the only voided layer is said voided core layer.
A label made from a polymeric film;
- said label including printing on an exposed surface thereof;
- and said film being 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 co-extruded biaxially oriented 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, one or more substantially non-voided layers of polyolefin co-extruded onto a first side of said core layer, and one or more substantially non-voided layers of polyolefin co-extruded onto a second side of said core layer;
- wherein said one or more non-voided layers of polyolefin on said first side of said core layer have a combined thickness and said one or more non-voided layers of polyolefin on said second side of said core layer have a combined thickness such that the combined thickness on the first side of said core layer and the combined thickness on the second side of said core layer are in a ratio of from 2:1 to 1:1 and wherein the only voided layer is said voided core layer.
1 more element
Dependencies are inferred from the claim text.