Abstract: A low density opaque polymer film containing at least one layer having a propylene polymer matrix that has been cavitated by a two component cavitation system, wherein the first component of the two component cavitation system is a beta-nucleating agent to produce the beta-crystalline form of polypropylene, and the second component is filler. A method of manufacturing a low density cavitated opaque polymer film, including: forming a melt containing a propylene polymer, a beta nucleating agent and filler; cooling the melt to form a film layer; and stretching the film layer to form voids therein. The cavitated opaque film has a density falling within the range of 0.2 g/cm3 to 0.45 g/cm3.

Abstract: A permeable, propylene-containing film structure including a core layer containing a propylene polymer matrix that has been cavitated by a two-component cavitation system, wherein the first component of the two-component cavitation system is a beta-nucleating agent to produce the beta-crystalline form of polypropylene and the second component is a filler. The film structure also includes first and second thermoplastic skin layers on either side of the core layer, respectively. A method of manufacturing a permeable propylene-containing film structure, including: forming a melt containing a propylene polymer, a beta-nucleating agent and a filler; cooling the melt to form a film layer; and stretching the film layer. The film structure has a water vapor transmission rate greater than 300 g/m2/day and a Gurley air permeability less than 3,000 s/10 cc.

Abstract: The invention provides a labelling process comprising providing a container and a polymeric film label, applying water-based adhesive to one side of the label and applying the side of the label to which adhesive has been applied to the container, characterised in that the adhesive is applied to the label in a discontinuous pattern. The pattern is preferably formed from non-contiguous indicia, in particular dots.