Polypropylene films
AssigneeVifan USA, Inc.
InventorsVittoriano DiLuzio, Paul Alder, Michael T. Heffelfinger
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Abstract
Polypropylene films and methods for making the films having white opaque characteristics are disclosed. The films typically incorporate polymer blending to improve microcavitation, increased opacity, increased optical density and lower light transmission for a white opaque film with CaCO3 loading at and above 40% by weight. A combination of polypropylene resins of specified density, crystallinity and ratio relationships have been identified with TiO2.
Claims35
A biaxially oriented polypropylene film, comprising:
- a core film layer having a polymer matrix including a propylene polymer, the polymer matrix being about 30-90% by weight;
- and
- a particulate filler disposed within the matrix, the filler being about 50-70% by weight.
A biaxially oriented white opaque film including a film layer, the film layer comprising about 30-90% by weight of a polymer matrix including a low crystallinity propylene polymer;
- and about 50-70% by weight of a particulate filler disposed within the matrix.
A multilayered polypropylene film, comprising:
- a voided core layer having a first surface and a second surface including polypropylene and particulate voiding agent;
- a first non-voided outer layer including polypropylene adhered to the first surface of the core layer;
- and
- a second non-voided outer layer including polypropylene adhered to the second surface of the core layer.
Dependencies are inferred from the claim text.