Polyolefin film having improved mechanical properties

Details Polyolefin film having improved mechanical properties Polyolefin film having improved mechanical properties

1985-10-21

1987-10-06

Buffalow, Edith

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428332, 428349, 428352, 428516, 428518, B32B 300

Patent

active

046982612

ABSTRACT:
An opaque polyolefin film having a three-layer support film and transparent or clear polyolefin covering layers which cover the two surfaces of the support film. In the support film, either the inner layer or the two intermediate layers arranged between the inner layer and the covering layers are composed of a filler-free polyolefin which is modified with a natural or synthetic resin having a softening point ranging from 70.degree. C. to 180.degree. C. The respective non-modified polyolefin layer or layers of the support film have a filler and exhibit a vacuole structure which produces a relatively low density film of less than 0.9 g/cm.sup.3. The production of the opaque polyolefin film comprising five layers is carried out by coextrusion and biaxial stretching, followed by heat setting the coextruded film. The film is advantageously used for packaging purposes.

REFERENCES:
patent: 4239822 (1980-12-01), McGee
patent: 4303708 (1981-12-01), Gebhardt et al.
patent: 4377616 (1983-03-01), Ashcraft et al.
patent: 4522887 (1985-06-01), Koebisu et al.
patent: 4526823 (1985-07-01), Farrell et al.
patent: 4608284 (1986-08-01), Roales

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