White, conformable films for pressure-sensitive-labeling applications
AssigneeJindal Films Americas LLC
InventorsBenoît Ambroise, Daniel L. Hinman, Robert M. Sheppard, Michael D. Cleckner
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Abstract
A squeezable, white polypropylene film is disclosed having a novel balance of conformability, stiffness, modulus, opacity, and whiteness. The film includes an ABCBA structure having a core layer of polypropylene resin with an elastomeric copolymer and a cavitating agent. Two intermediate layers of polypropylene resin are present on either side, the intermediate layers optionally including an elastomeric copolymer and a pigmenting agent. Two polymer skin layers surround the two intermediate layers. The resins are co-extruded into a biaxially oriented film having a thickness between 40 to 70 pm for use in pressure-sensitive labeling applications.
Claims16
A biaxially oriented, conformable, multilayer film comprising:
- a core layer consisting of:
- (i) polypropylene, (ii) between 10 and 50 wt. % propylene-based elastomer, and (iii) a cavitating agent consisting of polybutylene terephthalates, calcium carbonate, zeolite, cyclic olefin polymers or copolymers, glass beads, polymeric and/or mineral cavitating agents, and combinations thereof, wherein the core layer having a first side and a second side;
- a first and second intermediate layers located on the first and second side, respectively, of the core layer, wherein the first and second intermediate layers consist of:
- (i) polypropylene homopolymer, and optionally, a pigmenting agent;
- and
- a first and second skin layers, located on the first and second intermediate layers, respectively,
- wherein the biaxially oriented, conformable, multilayer film is white-opaque, has a film density of less than 0.71 g/cm3 and a light transmission of 30.5% to 92.6%,
- wherein the biaxially oriented, conformable, multilayer film exhibits no creasing after ten cycles of deflation and inflation.
Dependencies are inferred from the claim text.