Multi-layer film

Assignee: Idemitsu Petrochemical Co Ltd

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Filing: 1984-11-10

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Granted: —

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Expires: 2004-11-10

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Abstract

Abstract @ The present invention relates to a multi-layer film comprising at least three layers of two outer layers and an intermediate layer sandwiched therebetween wherein the intermediate layer is formed of a resin composition of a high density polyethylene and an ethylene a-olefin copolymer, and the outer layers are formed of an ethylene a-olefin copolymer and at least one of the outer layers is formed of a resin composition of an ethylene a-olefin copolymer and a low density polyethylene. The object of the present invention is to provide a multi-layer film having a high mechanical strength and superior in properties such as heat sealability, antiblocking, and automatic packaging property.

Inventors

👤 Takanori Aishima
👤 Makoto Utsumi
👤 Yoshihiro Ezaki

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-08 13:20

CPC Classifications

B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/322; B32B2307/00; B32B2307/70; B32B2307/72; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913

Claims Analysis

Total Claims: 7

Claim 1

Independent Claim 83 words

A multi-layer film comprising at least three layers of-two outer layers and an intermediate layer sandwiched therebetween wherein the intermediate layer is formed of a resin composition composed of a high density polyethylene and an ethylene a-olefin copolymer, and the two outer layers is formed of an ethylene a-olefin copolymer and at least one of the two outer layers is formed of a resin composition composed of an ethylene a-olefin copolymer and a low density polyethylene produced by the high pressure polymerization method.

Claim 2

Dependent Claim 83 words

Claim 3

Dependent Claim 29 words

The multi-layer film as claimed in Claim 1, wherein the resin composition for the intermediate layer further contains a low density polyethylene produced by the high pressure polymerization method.

Claim 4

Dependent Claim 22 words

The multi-layer film as claimed in Claim 1, wherein the resin composition for the intermediate layer further contains a low-crystallinity a-olefin copolymer.

Claim 5

Dependent Claim 33 words

The multi-layer film as claimed in Claim 1, wherein the ethylene a-olefin copolymers constituting the intermediate layer and two outer layers have a density in the range from 0.900-0.940 gram per cubic centimeter.

Claim 6

Dependent Claim 37 words

The multi-layer film as claimed in Claim 1, wherein the ethylene a-olefin copolymers constituting the _ two outer layers contains from 1 to 20 percents by weight of an a-olefin having from 3 to 20 carbon atoms.

Claim 7

Dependent Claim 42 words

The multi-layer film as claimed in Claim 1, wherein the resin composition for the intermediate layer comprises from 90 to 10 percents by weight of a high density polyethylene and from 10 to 90 percents by weight of an ethylene a-olefin copolymer.

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