Multilayered polyamide film

A technology of polyamide and polyamide layer, which is applied in the field of polyamide laminated film and can solve problems such as bag rupture

Active Publication Date: 2007-02-14
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] That is, it is known that a film made of aromatic polyamide is more resistant to deterioration due to oxidation than aliphatic polyamide, but in the case of aliphatic polyamide or a film mixed with aliphatic polyamide, Or in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Use three 65mmφ extruders to melt and mix poly-m-xylylene adipamide (aromatic polyamide (A): Made by Mitsubishi Gas Chemical Co., Ltd., "MX-Nylon 6007") and polyamide elastomer (improving material for bending and pinhole resistance; "PEBAX4033" made by Atofina Co., Ltd.), relative viscosity is mixed in layer (b) 3.7 Poly(epsilon)-caprolactam (aliphatic polyamide (B): manufactured by Mitsubishi Engineering Plastics Co., Ltd., "NOVAMID1022") and aromatic polyamide (A ) and the resin composition of the aliphatic polyamide (B), and the above-mentioned aliphatic polyamide (B) of the (b) layer and the aromatic polyamide (A) and the aliphatic polyamide (B) of the (c) layer The mixture is divided into roughly half by a distribution block, laminated in a co-extrusion T-die, extruded into a laminated film with a 5-layer structure, and rolled under a 30°C calender roll (casting roll) Closed and quenched, the outer layer is composed of about 32 μm aliphatic polyamide (B), the midd...

Embodiment 2～8、 comparative example 1～3

[0133] A laminated biaxially stretched film was obtained in the same manner as described in the same example except that the layer structure and the resin composition of each layer were changed to those described in Table 1 described later in Example 1. Table 1 shows the results of evaluation of these films.

reference example 1

[0151] Nylon-6 (manufactured by Mitsubishi Engineering Plastics Co., Ltd., "NOVAMID 1022") 99.9 parts by weight as an aliphatic polyamide and N,N'-hexamethylene as a hindered phenolic antioxidant were mixed with a drum mixer. Bis(3,5-di-tert-butyl-4-hydroxy-hydrocinnamic acid amide) (A) (manufactured by Ciba Specialty Chemical Co., Ltd., "IRGANOX1098") 0.1 parts by weight of the obtained mixture (referred to as NY6) as layer (b') As a raw material, polym-xylylene adipamide (MXD: manufactured by Mitsubishi Gas Chemical Co., Ltd., MX-nylon 6007) which is an aromatic polyamide was used as a raw material for the (a) layer, and a mixture of NY6 and MXD (NY +MXD: NY6 / MXD weight ratio = 85 / 15) As the raw material of (c) layer, use three 65mmφ extruders to melt the raw materials of (b'), (a) layer and (c) layer respectively, Then divide the raw materials of (b') layer and (c) layer into 2 parts in the distribution section, introduce them into the co-extrusion T-die, and extrude into a...

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Abstract

There is provided a polyamide-based laminated film with a multi-layered structure including 5 or more layers, comprising (a) an aromatic polyamide layer, (b) an aliphatic polyamide layer and (c) a layer made of a mixture containing an aromatic polyamide and an aliphatic polyamide at a weight ratio of 5:95 to 20:80, said layer (c) being disposed adjacent to the layer (a) and/or the layer (b), and said film having 5 or less pinholes per 497 cm <2> as measured after subjecting the film to 3000 cycles of repeated flexing operation at a temperature of 23 DEG C and a relative humidity of 50%, using a Gelboflex tester. The polyamide-based laminated film is free from interlaminar peeling between the aliphatic polyamide layer and the aromatic polyamide layer, and can exhibit excellent properties including an oxygen gas-barrier property, a flex/pinhole resistance, a transparency, a heat resistance and a toughness. The polyamide-based laminated film in which at least one layer of the film is a polyamide-based resin layer containing a hindered phenol-based antioxidant in an amount of 0.01 to 0.5% by weight, and a thickness of the polyamide-based resin layer is 10% or more but less than 80% of a whole thickness of the film, the resultant laminated film is further excellent in hydrothermal resistance and adhesion to other plastic films and, therefore, can be suitably used as a packaging material for foods, medical products and drugs or chemicals which tend to be deteriorated in quality upon exposure to oxygen.

Description

technical field [0001] The present invention relates to a polyamide-based laminated film which is excellent in oxygen barrier properties, bending resistance, transparency, heat resistance, toughness, etc. or hot water resistance or adhesion to other plastic films, and is suitable for Packaging for food, medical supplies, and pharmaceuticals to prevent the deterioration of the contents due to oxygen. Background technique [0002] Conventionally, films made of polyamide resins have been used alone or as laminates with other films for various general packaging applications. Furthermore, each of these films has advantages and disadvantages, and they can be used for different purposes. [0003] For example, a film made of aliphatic polyamide is excellent in mechanical properties such as tensile strength and bending resistance, but when it is used for retort purposes, the film will deteriorate during retort, and bagging often occurs. rupture. Therefore, the structure containing...

Claims

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Application Information

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IPC IPC(8): B32B27/34
Inventor 中村健次宫下和久秦博司石井和秀杉山政义
Owner MITSUBISHI CHEM CORP
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