Polyamide laminate film and production method for same

A polyamide-based film and polyamide-based technology, applied in the direction of chemical instruments and methods, layered products, flat products, etc., can solve the problem of uniformity of stretched film thickness, unsatisfactory dimensional stability, and metal foil breakage , low productivity and other problems, to achieve excellent balance of stress, prevent metal foil from breaking, and excellent uniformity of thickness

Active Publication Date: 2019-04-16
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, not only the productivity is low, but also the obtained stretched film is not sufficiently satisfactory in thickness uniformity, dimensional stability, etc.
In particular, when the thickness of the film varies, and cold forming is used to process the laminated body of the film and metal foil, fatal defects such as breakage of the metal foil and pinholes may occur

Method used

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  • Polyamide laminate film and production method for same
  • Polyamide laminate film and production method for same
  • Polyamide laminate film and production method for same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0166] The preparation itself of the melt-kneaded product may be carried out according to a known method. For example, a raw material containing a polyamide resin is put into an extruder equipped with a heating device, heated to a predetermined temperature and melted, the melted kneaded product is extruded through a T die, and cooled by a casting drum or the like. By curing, an unstretched sheet that is a sheet-shaped molded product can be obtained.

[0167] The average thickness of the unstretched sheet at this time is not particularly limited, but is usually about 15 to 250 μm, particularly preferably 50 to 235 μm. By setting it in such a range, a stretching process can be implemented more efficiently.

[0168] stretching process

[0169] In the stretching step, the unstretched sheet is sequentially or simultaneously biaxially stretched in MD and TD to obtain a stretched film.

[0170] As described above, a stretched film obtained by sequential biaxial stretching includ...

Embodiment

[0230] Examples and comparative examples are shown below to more specifically describe the characteristics of the present invention. However, the scope of the present invention is not limited by the examples. In addition, the measurement method and evaluation method of various characteristic values ​​of the polyamide-type film, polyamide-type laminated film, and laminated body obtained in the Example and the comparative example were performed as follows.

[0231] (1) Composition of copolyester resin

[0232] 1H-NMR measurement was performed using an NMR measurement apparatus (JNM-LA400 type manufactured by JEOL Ltd.), and the composition of each copolymerization component was calculated|required. In addition, deuterated trifluoroacetic acid was used as a measurement solvent.

[0233] (2) Number average molecular weight of copolyester resin

[0234] Using gel permeation chromatography (GPC), the polystyrene-equivalent number average molecular weight was measured under the fo...

preparation example 1

[0271] 83g (50 mol%) of terephthalic acid, 83g (50 mol%) of isophthalic acid, 23g (37 mol%) of ethylene glycol, 66g (63 mol%) of neopentyl glycol, 1,4-cyclohexane 36 g (25 mol%) of alkane dimethanol, 100 g (10 mol %) of polytetramethylene glycol, and 0.1 g of tetrabutyl titanate as a polymerization catalyst were charged into the reactor, and the system was replaced with nitrogen. Then, stirring these raw materials at 1000 rpm, the reactor was heated at 245° C. to melt them. The esterification reaction was carried out for 3 hours after the temperature in the reactor reached 245°C. After 3 hours, the temperature in the system was set to 240° C., and the pressure in the system was reduced. In the system to achieve high vacuum (pressure: 0.1 ~ 10 －5 After Pa), the polymerization reaction was carried out for another 3 hours to obtain the copolyester resin (A).

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Abstract

The invention is to provide: a polyamide laminate film that has excellent uniformity of thickness and comparatively little variation in physical properties in a 0 degree direction, a 45 degree direction, a 90 degree direction, and a 135 degree direction; and a production method for the polyamide laminate film. A polyamide laminate film in which there is a copolymer polyester resin layer on at least one side of a polyamide film is provided. (1) The difference between the maximum value and the minimum value for the stress at 5% elongation during uniaxial tensile tests in four directions represented by 0 degrees, which is a specific direction from any point on the polyamide film, and 45 degrees, 90 degrees, and 135 degrees clockwise from said direction is 35 MPa or less. (2) The difference between the maximum value and the minimum value for the stress at 15% elongation during uniaxial tensile tests in the four directions is 40 MPa or less.

Description

technical field [0001] The present invention relates to a novel polyamide-based laminated film and its manufacturing method. Moreover, this invention relates to the laminated body and container which used this laminated film. Background technique [0002] Various resin films are formed into various products such as packages by performing various processes. For example, a vinyl chloride film is used for packages (blister packs; press through packages) of pharmaceuticals (tablets) and the like. Also, for example, a polypropylene film is used when packaging contents requiring moisture resistance. In recent years, from the viewpoint of maintaining the quality of the contents, for the purpose of imparting more excellent gas barrier properties or moisture resistance, laminates in which metal foil is laminated on a resin film have been used. layer (resin film) / metal foil layer (aluminum foil) / sealant layer. [0003] In the industrial field, metal cans have been the mainstream e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/34B29C55/12B32B15/088B32B27/36B65D65/40B29K77/00B29L7/00B29L9/00
CPCB32B15/088B32B27/34B32B27/36B29C55/12B65D65/40
Inventor 松本真实前田幸史朗
Owner UNITIKA LTD
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