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Biaxially stretched, multi-layereded polyamide film and production method thereof

A technology of biaxial stretching and polyamide film, which can be applied to other household appliances, etc., can solve the problems of not being able to improve barrier properties, and achieve excellent transparency, small shrinkage, and excellent pinhole resistance.

Active Publication Date: 2013-06-05
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the barrier properties cannot be improved by the mentioned methods
No method has been proposed to effectively improve barrier properties when reusing trimmings, etc.

Method used

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  • Biaxially stretched, multi-layereded polyamide film and production method thereof
  • Biaxially stretched, multi-layereded polyamide film and production method thereof
  • Biaxially stretched, multi-layereded polyamide film and production method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0078] Through the above-mentioned preparation method, when measured using the Gelbo test (bending number: 1000) to be described below, the number of pinholes formed is preferably controlled at 2 / 624cm 2 or lower range. In order to effectively prepare such a biaxially stretched multilayer polyamide film resistant to pinhole formation, the following preparation conditions are preferred:

[0079] Casting roll temperature: 20-60°C,

[0080] Heating roller temperature for longitudinal stretching: 80-100°C,

[0081] Longitudinal stretch rate: 3.0-3.3 times,

[0082] Transverse stretching temperature: 80-120°C,

[0083] Transverse stretch rate: 3.6-4.2 times,

[0084] Heat treatment temperature: 210-220°C, and

[0085] Heat treatment time: 4-10 seconds.

[0086] Through the above-mentioned preparation method, when the distillation treatment is carried out at 121° C. for 30 minutes, the shrinkage in both the longitudinal and transverse directions is preferably controlled at 3-8...

Embodiment 1

[0113] In three 65 mmΦ extruders, nylon MXD6 (polyamide resin X, "MX Nylon 6011" (trademark) manufactured by Mitsubishi Gas Chemical Company, Inc., diamine structural unit = m-xylylenediamine unit , dicarboxylic acid structural unit = adipic acid unit) and poly(ε-caprolactam) (aliphatic polyamide resin Y, "Ube Nylon1022FDX04" manufactured by Ube Industries, Ltd.), laminated in a T-die, and then extruded into a three-layer laminated film (Y / X / Y(B / A / B)). The laminated film was brought into close contact with a casting roll at 30°C for quenching using a pinning device to obtain a multilayer original film of Y / X / Y=50 / 50 / 50 μm (non-stretched laminated film ). The non-stretched laminated film was longitudinally stretched 3 times by a roll at 85° C. using a roll stretcher. After holding the edges of the film with tenter clips, the film was stretched 3.3 times in the transverse direction in a tenter oven at 100-120°C. Thereafter, the film was heat-set at 215° C. for 10 seconds to o...

Embodiment 2

[0115] A biaxially stretched multilayer polyamide film was obtained in the same manner as in Example 1, except that the temperature of the casting roll was changed to 40°C, and the temperature of the longitudinal stretching roll was changed to 95°C. The evaluation results are shown in Table 1.

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Abstract

A method of producing a biaxially stretched, multi-layered polyamide film which includes a step of biaxially stretching a non-stretched laminate film composed of a layer mainly made of a polyamide resin and a layer mainly made of an aliphatic polyamide resin. The biaxial stretching is made by a roll / tenter successive biaxial stretching method. The polyamide resin is composed of a diamine constitutional unit mainly made of m-xylylenediamine units and a dicarboxylic acid constitutional unit mainly made of units derived from an alpha,omega-aliphatic dicarboxylic acid having 6 to 12 carbon atoms.The non-stretched laminate film is cooled by a cooling roll having a temperature within a limited range and then successively and biaxially stretched. With such a production method, the biaxially stretched, multi-layered polyamide film is excellent in the gas barrier properties, pinhole resistance, flexibility, and impact resistance.

Description

technical field [0001] The present invention relates to a biaxially oriented multilayer polyamide film having excellent flexibility, impact resistance, pinhole resistance, transparency and resistance to boiling treatment or retort treatment ), the present invention also relates to the preparation method of the biaxially stretched multilayer polyamide film. Background technique [0002] Currently, a multilayer film having a gas barrier layer made of polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), or polyamide has been used as a gas barrier packaging material. Compared with other known gas barrier resins, the m-xylylenediamine-containing unit produced by polycondensation of m-xylylenediamine and α,ω-aliphatic dicarboxylic acid The polyamide has less loss of gas barrier performance and can quickly recover gas barrier performance when subjected to boiling treatment or distillation treatment. In particular, polym-xylylene adipamide (which may be referre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/14B29C55/18B29C71/02B32B27/34B29L9/00B29K77/00
Inventor 难波宽行河野宪治高桥诚
Owner MITSUBISHI GAS CHEM CO INC
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