Uniaxially oriented label film with compatibilizer
AssigneeAvery Dennison Corporation
InventorsKarl Josephy, Mitchell J. Rackovan, Donald F. Kimes
Life of this patent
Estimating the term…
Abstract
Physical properties of extruded, uniaxially oriented films useful in label manufacture and formed from blends of olefinic base materials and soft polar additives such as ethylene vinyl acetate (EVA) are changed in a directionally selective manner that improves abrasion resistance while preserving conformability by use of compatibilizers or coupling agents in the blends. Machine direction strength properties, including stiffness and tensile modulus, increase with little or no degradation of cross-direction elongation, and with limited degradation of cross-direction tensile modulus, both required for good label conformability.
Claims23
A polymeric label die-cut from an extrusion-cast multilayer film uniaxially oriented at a stretch ratio of between 2 and 9 and comprising at least one skin layer and a relatively thick core layer, at least said skin layer comprising a blend of at least one polyolefin and at least one soft polar additive and a compatibilizer, said skin layer comprising between about 30% and 60% by weight soft polar additive, and said core comprising a blend of at least one polyolefin and at least one soft polar additive containing between about 5% and 50% by weight soft polar additive, and an adhesive layer associated with said film for adhering said label to a substrate, provided that the polyolefin or the weight ratio of the soft polar additive in the skin layer is different from the polyolefin or weight ratio of the soft polar additive in the core layer.
Dependencies are inferred from the claim text.