Transparent polyolefin multilayer film having a low sealing temp

Details Transparent polyolefin multilayer film having a low sealing temp Transparent polyolefin multilayer film having a low sealing temp

Filed on

1993-02-23

Date issued

1995-07-25

Examiner

Buffalow, Edith

Patent Class

Stock material or miscellaneous articles

SubClass

Hollow or container type article

SubSubClass

Paper containing

Other Related Categories

428 359, 428 364, 428215, 428332, 428349, 428354, 428516, 525387, B29D 2200

Type

Patent

Status

active

Patent number

054360412

Description

ABSTRACT:
A transparent, printable, biaxially orientated polyolefin multilayer film which can be sealed on both sides, having a base layer B and different top layers A and C located on both sides thereof in accordance with a layer build-up of ABC is provided. The base layer B contains a peroxidically degraded polypropylene polymer having a degradation factor in the range from about 3 to about 10. Top layer A contains a polymer mixture of two or more of the following co- and/or terpolymers: a copolymer of ethylene and propylene or ethylene and butylene or propylene and butylene or ethylene and another .alpha.-olefin having 5 to 10 carbon atoms or propylene and another .alpha.-olefin having 5 to 10 carbon atoms, or a terpolymer of ethylene and propylene and butylene or ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms. This polymer mixture of top layer A further contains a high-viscosity polydiorganosiloxane and silicon dioxide and, if appropriate, other added additives. Top layer C contains a copolymer of ethylene and propylene or ethylene and butylene or propylene and butylene or ethylene and another .alpha.-olefin having 5 to 10 carbon atoms or propylene and another .alpha. -olefin having 5 to 10 carbon atoms, or a terpolymer of ethylene and propylene and butylene or ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms and, if appropriate, other additives. Top-layer C has a non-cohesive covering of polydialkylsiloxane on its outer surface. The film is useful, for example, as a packaging film and in the production of laminates.

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