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Polyamide-based laminated film and manufacturing method thereof

A polyamide-based film and polyamide-based technology, which is applied in chemical instruments and methods, layered products, flat products, etc., can solve the problem of stretched film thickness uniformity, unsatisfactory dimensional stability, and metal foil breakage. , low productivity, etc., to achieve the effect of excellent stress balance, prevention of metal foil breakage, and excellent thickness uniformity

Active Publication Date: 2021-12-21
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-based laminated film and manufacturing method thereof
  • Polyamide-based laminated film and manufacturing method thereof
  • Polyamide-based laminated film and manufacturing method thereof

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 present invention provides a polyamide-based laminated film having excellent thickness uniformity and less variation in physical properties in four directions including a 0-degree direction, a 45-degree direction, a 90-degree direction, and a 135-degree direction, and a method for producing the same. A polyamide-based laminated film having a copolyester resin layer on at least one surface of the polyamide-based film, (1) at 0 degrees from an arbitrary point in the polyamide-based film in a specific direction , 4 directions of 45 degrees, 90 degrees and 135 degrees rotated clockwise with respect to this direction, the difference between the maximum value and the minimum value of each stress when the elongation is 5% based on the uniaxial tensile test is 35 MPa or less; (2 ) In the above four directions, the difference between the maximum value and the minimum value of each stress at 15% elongation based on a uniaxial tensile test 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 Patents(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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