Polymeric packaging film comprising aromatic vegetable oil

Details Polymeric packaging film comprising aromatic vegetable oil Polymeric packaging film comprising aromatic vegetable oil

1991-09-27

1994-10-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428218, 4283211, 428497, 428523, B32B 702

Patent

active

053566998

ABSTRACT:
Polyolefin polymeric packaging film is provided with a structure varying across its thickness from monolithic to porous with a density gradient ranging from .rho. to (1/2 to 1/4).rho., where .rho. is the density of monolithic polyolefin. The packaging film is characterized by a varying structure across its thickness. Such a film possesses the functions of a multi-layer film, but has none of the disadvantages of the latter associated with different adhesion of the layers, possible delamination in the course of storage and use, as well as the complex manufacturing process of a multi-layer film. The gradual transition of the porous structure of polyolefin to the poreless one from one surface of the film to another ensures distribution of liquid-phase specific additives along the film thickness.

REFERENCES:
patent: 4701369 (1987-10-01), Duncan
patent: 4847145 (1989-07-01), Matsui
patent: 5028479 (1991-07-01), Pinchuk et al.
patent: 5091262 (1992-02-01), Knott et al.

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