JP4361324B2 - Packaging film and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging film suitable for protecting electronic components such as ICs and LSIs which are easily damaged by gas such as water vapor and oxygen, static electricity and the like, and a substrate incorporating the electronic components, and a method for manufacturing the packaging film.

  Conventionally, as a packaging film for the purpose of protecting electronic parts or the like, for example, a coating film of carbon or metal powder on the outer surface of the substrate disclosed in Patent Document 1 (Japanese Patent Publication No. 7-121570) or A so-called laminate film is known in which a conductive layer made of a metal vapor-deposited film, a heat seal layer made of polyolefin kneaded with an antistatic agent on the inner surface, and an aluminum foil layer having a thickness of 7 to 20 μm are laminated between the outer surface and the inner surface. ing.

  Laminate films for packaging electronic parts, etc., must have excellent antistatic properties, and the electronic parts, etc., which are the contents during transportation and storage, are exposed to water vapor, oxygen, etc. from the external environment. Barrier properties that are not affected by the gas are required.

  In order to impart antistatic properties, an antistatic agent is applied to the outer surface layer and inner surface layer, or an antistatic agent is added to the film, and an effect is obtained. To impart barrier properties, a metal foil is provided. And using metal / inorganic vapor-deposited films.

Japanese Examined Patent Publication No. 7-121570

  The means of Patent Document 1 is that the polyolefin layer used on the inner surface may use additives such as antioxidants and lubricants in order to improve and improve processability and practical quality in addition to the antistatic agent. Always. However, it is conceivable that such an additive precipitates on the film surface and adversely affects the contact with the contents.

  On the other hand, when it is processed without adding an additive, it may be considered that slipping or blocking is caused in the bag-making process after the lamination process and the productivity and workability are lowered in the bag-making process.

  The purpose of the present invention is to protect moisture-proof, anti-static properties, low contact with the contents of the additive, electronic components such as IC, LSI, etc., which are excellent in bag making processes, etc., and substrates incorporating electronic components. It is to provide a suitable packaging film.

The present invention, in order to solve the above problems, a base material imparted with antistatic properties from the outer surface in order, a metal barrier foil layer, a polyolefin layer imparted with antistatic properties is laminated polyolefin layer imparted with antistatic properties Can be obtained by adding a higher fatty acid amide as an antistatic agent and a lubricant, preferably 50 to 500 ppm of erucic acid amide, to obtain a film excellent in suitability for a bag making process or the like. Specific claims of the invention will be described below.

The present invention according to claim 1 is a polyolefin layer to which an antistatic property-provided base material, a metal barrier foil layer, an antistatic agent are added and 50 to 500 ppm of a higher fatty acid amide is added as a lubricant in order from the outer surface. Is a film for packaging characterized in that both the outer surface and the inner surface have antistatic properties.

  In general, the antistatic agent added to the polyolefin includes higher fatty acid ester, higher aliphatic alcohol, and higher aliphatic amine.

  Examples of higher fatty acid ester antistatic agents include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monooleate, diglycerin monolaurate, diglycerin dilaurate, Diglycerol monomyristate, diglycerol dimyristate, diglycerol sesquimyristate, diglycerol monopalmitate, diglycerol dipalmitate, diglycerol sesquipalmitate, diglycerol monostearate, diglycerol distearate, diglycerol Sesquistearate, diglycerol monobehenate, diglycerol dibehenate, diglycerol sesquibehenate, diglycerol monooleate, diglycerol dioleate, di Li Serinse Schio rate, sorbitan monolaurate, sorbitan mono-myristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate, sorbitan monooleate.

  Examples of the higher fatty acid alcohol antistatic agent include lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol and the like.

  Examples of the higher fatty acid amine-based antistatic agent include lauryl diethanolamine, myristyl diethanolamine, palmityl diethanolamine, stearyl diethanolamine, oleyl diethanolamine, lauryl diisopropanolamine, myristyl diisopropanolamine, palmityl diisopropanolamine, stearyl diisopropanolamine, oleyl diethanolamine. Isopropanolamine etc. are mentioned.

  Fatty acid amide lubricants generally added to olefins include aliphatic amides having 8 to 24 carbon atoms such as erucic acid amide, oleic acid amide, stearic acid amide, palmitic acid amide, behenic acid amide, ethylenebisoleic acid amide, Examples thereof include ethylene bis stearic acid amide.

  The present invention according to claim 2 is a packaging film in which a second base material layer is further laminated between the metal barrier foil layer and the polyolefin layer.

In the present invention according to claim 3, the polyolefin layer is a low-density polyethylene or a high-pressure radical produced by a high-pressure radical polymerization method, to which at least one higher fatty acid ester-based antistatic agent is added as the antistatic agent. An ethylene copolymer produced by a polymerization method and having at least one higher fatty acid ester-based antistatic agent added as the antistatic agent , and laminated by an extrusion laminating method. It is a film for packaging of description.

Further, in the method for producing a packaging film of the present invention, it is produced by a high-pressure radical polymerization method, and at least one higher fatty acid ester antistatic agent is added and higher fatty acid amide is 50 to 500 ppm as a lubricant. Polyolefin layer consisting of added low density polyethylene, or ethylene produced by high pressure radical polymerization method, with at least one higher fatty acid ester antistatic agent added and higher fatty acid amide added as a lubricant in an amount of 50 to 500 ppm A polyolefin layer made of a copolymer is laminated on a base material layer imparted with antistatic properties and a metal barrier foil layer laminated on the base material layer by an extrusion laminating method or a dry laminating method. (Claim 4).

Further, the polyolefin layer is an ethylene-α olefin copolymer to which at least one higher fatty acid ester antistatic agent is added and erucic acid amide is added in an amount of 50 to 200 ppm as the higher fatty acid amide. They can be laminated and formed by a processing method or a dry laminating method (claims 5 and 6 ).

  The packaging film of the present invention is formed by laminating a base material imparted with antistatic properties, a metal barrier foil layer, a polyolefin layer imparted with antistatic properties and containing 50 to 500 ppm of a higher fatty acid amide in order from the outer surface. In addition, both the outer surface and the inner surface are effective in ensuring stable antistatic properties. By adding 50 to 500 ppm of a higher fatty acid amide, high aptitude (no occurrence of defects during bag making) can be maintained, which is effective. In addition, by providing the second base material layer between the metal barrier layer and the polyolefin layer, the second base material layer is strong against bending and piercing, and is effective in suppressing the generation of pinholes during storage and transportation.

  Further, the polyolefin layer produced by the production method of the present invention and the packaging film high-pressure radical polymerization method by the production method, to which at least one higher fatty acid ester-based antistatic agent is added, can be processed without adding a lubricant. Films that can be kept properly can be produced.

Further, the at least one higher fatty acid ester-based antistatic agent 50～200Pp m added pressurized polyolefin layer added vital erucic acid amide, it was possible to further promote the bag making appropriate and antistatic properties.

  Embodiments of the present invention will be described below with reference to the drawings.

  Reference numeral 1 denotes a first base material layer imparted with antistatic properties, 2 denotes a metal barrier foil layer, 3 denotes a polyolefin layer imparted with antistatic properties, and 4 denotes a second base material layer.

As shown in FIG. 1, the embodiment corresponding to Example 1 of the present invention includes a first base layer 1 imparted with antistatic properties from the outer surface, a metal barrier foil layer 2, and a polyolefin layer 3 imparted with antistatic properties. Are stacked.

As shown in FIG. 2, the embodiment corresponding to Example 2 of the present invention includes a first base layer 1 imparted with antistatic properties from the outer surface, a metal barrier foil layer 2, and a polyolefin layer 3 imparted with antistatic properties, The second base material layer 4 is further laminated between the metal barrier foil layer 2 and the polyolefin layer 3 imparted with antistatic properties.

  Examples of the first base layer 1 include a biaxially stretched polyethylene terephthalate film, a uniaxially or biaxially stretched nylon film, and a uniaxially or biaxially stretched polypropylene film.

  The metal barrier foil layer 2 may be any of iron foil, stainless steel foil, copper foil, and aluminum foil. In the case of aluminum foil, it is compared with alloy number 1N30 according to JISH0001, which has been widely used as an aluminum foil for general packaging. Therefore, it is preferable to use alloy numbers 8021 and 8079 according to JISH0001 which are excellent in elongation and spreadability.

The polyolefin layer 3 impart antistatic properties, a low contact resistance is required for the contents of the additives, at least one higher fatty acid ester-based antistatic agent from the request of suitability improve various bag-making processes kneading with the written ethylene -α-olefin copolymer forme Ri 50～200Pp m kneading erucic acid amide, for example linear low density polyethylene (LLDPE).

  If it is 49 ppm or less, the processability in the bag making process is poor, and if it is 201 ppm or more, the antistatic property is lowered, and whitening described later occurs.

  The thickness of the polyolefin layer imparted with antistatic properties is 15 to 150 μm, and preferably 30 to 80 μm, in order to exhibit sufficient antistatic performance and heat sealing performance.

  The second base material layer 4 may be a uniaxial or biaxially stretched polyethylene terephthalate film, a uniaxial or biaxially stretched nylon film, a uniaxial or biaxially stretched polypropylene film, or an unstretched nylon film. It is preferable to use a tougher biaxially stretched or unstretched nylon film in order to suppress the contents during storage, external piercing stress, and pinhole generation in the metal barrier foil due to bending. Although an unstretched nylon film is not limited to this, as a 1st base material layer, workability is bad, expansion-contraction arises, and it is weak to stress, such as a puncture as an outermost layer.

Reference example 1
On the back of a biaxially stretched polyethylene terephthalate film (PTME made by Unitika Co., Ltd.) with antistatic properties on the surface having a thickness of 12 μm, a 9 μm thick aluminum foil (Sumitomo Aluminum Foil Co., Ltd.) using urethane adhesive Manufactured by BESPA). The laminating method used was a dry laminating method. Subsequently, a low-density polyethylene (Sumitomo) manufactured by a high-pressure radical polymerization method using a urethane-based adhesive on the aluminum foil surface, without adding a lubricant, and with at least one higher fatty acid ester-based antistatic agent added. Chemical Industry Co., Ltd. product, Sumikasen CE4043) was laminated in a film form having a thickness of 50 μm. The lamination method used was an extrusion laminating method. Table 1 shows the physical properties of the prepared film and the suitability when bags are made using this film.

Example 1
Ethylene in which a higher fatty acid ester-based antistatic agent having a thickness of 50 μm is added and 200 ppm of erucic acid amide is added to the aluminum foil surface of a laminated film of a biaxially stretched polyethylene terephthalate film and an aluminum foil having the same configuration as in Reference Example 1. An α-olefin copolymer (L150R manufactured by Aicello Chemical Co., Ltd.) was laminated. The laminating method used was a dry laminating method using a urethane adhesive. Table 1 shows the physical properties of the prepared film and the suitability when bags are made using this film.

Example 2
A biaxially stretched nylon film (ONBC manufactured by Unitika Ltd.) having a thickness of 15 μm is applied to the aluminum foil surface of a laminated film of a biaxially stretched polyethylene terephthalate film and an aluminum foil having the same configuration as in Reference Example 1. Laminated. The laminating method used was a dry laminating method.

Was further laminated ethylene -α-olefin copolymer films of the same formulation as in Example 1 using a urethane adhesive to the biaxially stretched nylon film plane. The laminating method used was a dry laminating method. Table 1 shows the physical properties of the prepared film and the suitability when bags are made using this film.

Comparative Example 1
A film obtained by adding 600 ppm of erucic acid amide as a lubricant to the low density polyethylene of Reference Example 1 was laminated in a film form. The lamination method used was an extrusion laminating method. Table 1 shows the physical properties of the prepared film and the suitability when bags are made using this film.

Comparative Example 2 (FIG. 2)
A film in which the amount of erucamide added in the ethylene-α-olefin copolymer of Example 1 was 600 ppm was used for lamination. The laminating method used was a dry laminating method. Table 1 shows the physical properties of the prepared film and the suitability when bags are made using this film.

  Evaluation Method [Antistatic Property] Measured after leaving for 12 hours or more in an atmosphere of temperature 23 ° C. and humidity 65% RH based on the surface resistance value JISK-6991. [Water vapor permeability] Based on JISK-7129, measured at a temperature of 40 ° C. and a humidity of 90% RH. [Bending Method] Using a Gelboflex tester manufactured by Tester Sangyo Co., Ltd., twisting a sample of 210 × 330 mm by 440 ° is repeated 30 times. [Appropriate for bag making] The situation when a 300 × 300 mm three-side sealed bag is made at a speed of 50 bags / min.

比較例１，２は、帯電防止性が悪く、高級脂肪酸アミドであるエルカ酸アミドの添加量が重要であること、表面白化により、内容物を汚染させる欠点となる。また、実施例２の第２基材層により、屈曲においても、水蒸気透過度が極めて少ないことが判る。

In Comparative Examples 1 and 2, the antistatic property is poor, the addition amount of erucic acid amide, which is a higher fatty acid amide, is important, and the contents are contaminated by surface whitening. Moreover, it turns out that the water vapor permeability is very small even in bending by the second base material layer of Example 2 .

As a commercial utility of the present invention, it is a packaging film suitable for protecting electronic components such as ICs and LSIs, which are easily damaged by gas such as water vapor, oxygen, etc., or static electricity, and a substrate incorporating the electronic components. In addition, as a packaging bag for resin pellets and a food packaging bag, there is provided a packaging film that does not cause biting of the contents due to static electricity in a seal portion in an automatic filling and packaging line.

FIG. 1 shows a laminated structure of Example 1 of the present invention. FIG. 2 shows a laminated structure of Example 2 of the present invention.

Explanation of symbols

1 1st base material layer (antistatic property provision)
2 Metal barrier foil layer 3 Polyolefin layer (providing antistatic properties)
4 Second base material layer

Claims (6)

A base material layer imparted with antistatic properties,
A metal barrier foil layer laminated on the substrate layer;
A packaging film comprising a polyolefin layer, which is laminated on the metal barrier foil layer, to which an antistatic agent is added and 50 to 500 ppm of a higher fatty acid amide is added as a lubricant.   The packaging film according to claim 1, wherein a second base material layer is laminated between the metal barrier foil layer and the polyolefin layer. The polyolefin layer is produced by a high-pressure radical polymerization method, at least one higher fatty acid ester-based antistatic agent added as an antistatic agent, or at least 1 produced by a high-pressure radical polymerization method. The packaging film according to claim 1 or 2, which is an ethylene copolymer to which a kind of higher fatty acid ester antistatic agent is added as the antistatic agent , and is laminated by an extrusion laminating method. A polyolefin layer made of low-density polyethylene produced by a high-pressure radical polymerization method, to which at least one higher fatty acid ester antistatic agent is added and 50 to 500 ppm of a higher fatty acid amide is added as a lubricant, or a high-pressure radical polymerization method A polyolefin layer made of an ethylene copolymer to which at least one higher fatty acid ester antistatic agent is added and 50 to 500 ppm of higher fatty acid amide is added as a lubricant is provided with antistatic properties. A method for producing a packaging film, comprising: laminating a material layer and a metal barrier foil layer laminated on the base material layer by an extrusion laminating method or a dry laminating method. The polyolefin layer is an ethylene-α olefin copolymer to which at least one higher fatty acid ester antistatic agent is added and erucic acid amide is added in an amount of 50 to 200 ppm as the higher fatty acid amide. or packaging fill beam according to claim 1 or 2, wherein laminated by dry lamination method.   The polyolefin layer is an ethylene-α olefin copolymer to which at least one higher fatty acid ester antistatic agent is added and erucic acid amide is added in an amount of 50 to 200 ppm as the higher fatty acid amide. Or the manufacturing method of the film for packaging of Claim 4 laminated | stacked by the dry-laminating method.

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