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Multilayer polyolefin film for use in paper container for liquids, material for use in paper container for liquids comprising the same, and paper container for liquids using the same

A paper container and polyolefin technology, applied in the field of polyolefin film, can solve the problems of insufficient performance

Inactive Publication Date: 2008-02-06
NIPPON PAPER PAK +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve this problem, it has been proposed to use an ethylene-α-olefin copolymer (Patent Document 1) or a polyester (Patent Document 2) instead of polyethylene as a thermoplastic synthetic resin constituting the innermost sealing layer of the liquid paper container. A material that is proposed as a material for liquid paper containers, but has not yet achieved sufficient performance

Method used

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  • Multilayer polyolefin film for use in paper container for liquids, material for use in paper container for liquids comprising the same, and paper container for liquids using the same
  • Multilayer polyolefin film for use in paper container for liquids, material for use in paper container for liquids comprising the same, and paper container for liquids using the same
  • Multilayer polyolefin film for use in paper container for liquids, material for use in paper container for liquids comprising the same, and paper container for liquids using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] First, a biaxially stretched laminated polyolefin film serving as a strength-imparting layer was produced as follows.

[0145] The propylene-ethylene random copolymer (4.6% by weight of monomer units derived from ethylene, melting point of 135° C., and MFR of 2.1 g / 10 minutes) as the resin A constituting the first layer of the polyolefin film was 95% by weight, The propylene-ethylene random copolymer (0.4% by weight of monomer units derived from ethylene, melting point of 156° C., and MFR of 2.3 g / 10 minutes) as resin B constituting the first layer of polyolefin film was 5% by weight, mixed Resin A and resin B, make the resin of polyolefin film I layer.

[0146] A propylene-ethylene random copolymer (0.4% by weight of monomer units derived from ethylene, melting point of 156° C., MFR of 2.3 g / 10 minutes) as the resin C constituting the biaxially oriented oriented polyolefin film II layer 60% by weight, propylene-ethylene-1-butene terpolymer (6.2% by weight of monomer u...

Embodiment 2

[0176] The liquid paper container material of the present invention is produced as follows.

[0177] As the sealing layer A layer, a three-layer non-stretched polyolefin film with a total thickness of 30 μm laminated in the order of a / b / c was produced by three-layer co-extrusion, wherein a) was mixed with 50% by weight Propylene-ethylene random copolymer (3.6% by weight of monomer units derived from ethylene, melting point of 146° C., MFR of 7.0 g / 10 minutes) and 50% by weight of ethylene-1-butene copolymer (derived from 1- Butene monomer unit is 17% by weight, melting point is 63 ℃, MFR is 4.9g / 10 minutes) the layer that the thickness that constitutes of the resin of 4.9g / 10 minutes); The monomer unit derived from ethylene is 3.6% by weight, the melting point is 146° C., the MFR is 7.0 g / 10 minutes) and 30% by weight of ethylene-1-butene copolymer (the monomer unit derived from 1-butene is 17 % by weight, a melting point of 63° C., and a MFR of 4.9 g / 10 minutes), a layer hav...

Embodiment 3

[0184] The liquid paper container material of the present invention is produced as follows.

[0185] As the sealing layer A layer, a three-layer non-stretched polyolefin film with a total thickness of 30 μm laminated in the order of a / b / c was prepared by three-layer co-extrusion, wherein a) was mixed with 40% by weight Propylene-ethylene random copolymer (3.6% by weight of monomer units derived from ethylene, melting point of 146° C., MFR of 7.0 g / 10 minutes) and 60% by weight of ethylene-1-hexene copolymer (derived from 1- The monomer unit of hexene is 11% by weight, melting point is 100 ℃, MFR is 8.0g / 10 minutes) the layer that the thickness that constitutes of the resin of 8.0g / 10min); 3.6% by weight of monomer units derived from ethylene, melting point of 146° C., MFR of 7.0 g / 10 minutes) and 30% by weight of ethylene-1-butene copolymer (16% by weight of monomer units derived from 1-butene % by weight, a melting point of 66° C., and a MFR of 4.0 g / 10 minutes), a layer hav...

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Abstract

Disclosed are a multilayer polyolefin film which has a such specified layer structure that, when used as a sealant layer to be provided on the innermost surface of a paper container for liquids, can prevent the deterioration in flavor, taste or smack of a content in the container; a material for a paper container for liquids comprising the film; and a paper container for liquids using the film. A multilayer polyolefin film for use in a paper container for liquids comprising at least a surface layer (layer a), an opposite surface layer (layer c) and a middle layer (layer b), the layers a, b and c having the following properties: layer a: a layer comprising a propylene homopolymer or a propylene copolymer; layer b: a layer comprising a propylene copolymer and an ethylene-a-olefin copolymer; and layer c: a layer comprising an ethylene-a-olefin copolymer and having a melting point ranging from 60 to 140 DEG C and a thickness ranging from 1 to 20 [mu]m; a material for use in a paper container for liquids comprising the film; and a paper container for liquids using the film.

Description

technical field [0001] The present invention relates to a polyolefin film which does not change the taste, taste and flavor of the content when used as the innermost sealing layer of a liquid paper container, a liquid paper container material and a liquid paper container using the film. Background technique [0002] Conventionally, as liquid paper containers for milk, fruit juice, or other beverages, various types of containers such as gable top type, flat top type, and brick type are known. These liquid paper containers are molded using a liquid paper container material that is laminated with a thermoplastic synthetic resin as a sealing layer on both sides of the paper base material, and, when molding, must include an outermost layer of this liquid paper container material. A process in which a layer (for example, the innermost sealing layer when forming a liquid paper container) is heat-sealed with another outermost layer (which becomes the same outermost sealing layer). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B65D65/40B65D77/28
Inventor 佐瀬和彦宫川茂和阿曾井荣一大寺俊也仓本直彦植木新
Owner NIPPON PAPER PAK
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