JP2012066401A - Packaging material, and manufacturing method - Google Patents

Abstract

A packaging material excellent in non-adsorbability and a method for producing the same are provided at low cost.
A base film 1 and a non-adsorbing sealant film 2 are sequentially laminated, and the non-adsorbing sealant film 2 is laminated in the order of polyolefin resin 3 / adhesive resin 4 / acrylonitrile copolymer resin 5. Polyolefin resin 3, adhesive resin 4 and acrylonitrile copolymer resin 5 have a melt viscosity of 1000 to 6000 (Pa · s) at a temperature of 200 (° C.) and a shear rate of 60 (1 / s). Non-adsorbent packaging material having a difference of 1000 (Pa · s) or less. A production method in which a non-adsorptive sealant film is co-extruded into a polyolefin resin / adhesive resin / acrylonitrile copolymer resin in this order, and the base film and the non-adsorptive sealant film are extrusion laminated or knee laminated.
[Selection] Figure 1

Description

  The present invention relates to a packaging material excellent in non-adsorbability and a method for producing the same.

  Conventionally, as a packaging material excellent in non-adsorbability with respect to the active ingredients of the contents (hereinafter referred to as non-adsorbent packaging material), a laminate including a metal foil or a laminate including a plastic film formed with a metal deposition layer is widely used. It is used after being molded (bag making) into a bag-like container. As the metal, aluminum foil is often used in terms of cost and workability.

  However, the metal foil and the metal vapor-deposited layer are opaque when the thickness is non-adsorptive, and the contents are not visible when used as a packaging material. In addition, the metal foil becomes a lump in the furnace during incineration, and there is a problem in disposal.

  On the other hand, the acrylonitrile copolymer resin does not have the above-mentioned problems and can be practically used as a non-adsorbing material. Therefore, it is generally used in the construction of non-adsorbing packaging materials. Furthermore, the acrylonitrile copolymer is also known as an aroma retaining material that does not allow permeation of aroma components.

  This acrylonitrile copolymer is provided as, for example, a 20 to 30 μm film, and is generally dry-laminated or sand-laminated with another base film to form a part of the packaging material.

Although a method of coating an acrylonitrile copolymer in a solution has been devised, it is not easy to form a film by coating because the acrylonitrile copolymer is not dissolved in a general solvent suitable for mass production.
In addition, the following patent documents 1-4 are mentioned as a prior art regarding a non-adsorbable packaging material.

JP-A-11-170445 International Publication WO2003 / 043895 Pamphlet JP 2004-210356 A JP 2007-099324 A

  As described above, acrylonitrile copolymer is used in the form of a film, and a method of laminating with a base film to make a packaging material is common, but in recent years, the base film and acrylonitrile copolymer have been reduced in order to reduce the number of processes. Attempts have been made to perform multilayer coextrusion laminating with a plurality of types of resins including the above. When performing multilayer coextrusion, in order to improve the quality of the film formed by coextrusion, it is extremely important to align the viscosity characteristics of the resins constituting each layer.

  Therefore, the present invention provides a multilayer coextrusion of a plurality of types of resins containing an acrylonitrile copolymer, which has the same level of non-adsorption property as a packaging material using a general acrylonitrile copolymer film, and a substrate film and a coextrusion laminate. Alternatively, an object of the present invention is to provide a non-adsorbent packaging material that has been neat laminated and a method for producing the same.

The invention according to claim 1 is a non-adsorbing packaging material in which a base film and a non-adsorbing sealant film are sequentially laminated, and the non-adsorbing sealant film is a polyolefin resin / adhesive resin / acrylonitrile copolymer. The polyolefin resin, the adhesive resin, and the acrylonitrile copolymer resin have a melt viscosity of 1000 to 6000 (Pa · s) at a temperature of 200 (° C.) and a shear rate of 60 (1 / s). And a difference in melt viscosity between them is 1000 (Pa · s) or less.
In the invention described in claim 2, the non-adsorbing sealant film is composed of a polyolefin resin / adhesive resin / acrylonitrile copolymer resin, and the surface of the polyolefin resin of the non-adsorbing sealant film is relative to the base film. The non-adsorbent packaging material according to claim 1, wherein the non-adsorbable packaging material is laminated.
The invention according to claim 3 is characterized in that the base film is made of a stretched film, and a printed layer is formed on the surface of the base film on which the non-adsorbent sealant film is laminated. The non-adsorbing packaging material according to 1 or 2.
The invention according to claim 4 is a packaging material in which a base film and a non-adsorptive sealant film are sequentially laminated, and the non-adsorptive sealant film is made of polyolefin resin / adhesive resin / acrylonitrile copolymer resin. The method for producing a non-adsorbent packaging material according to any one of claims 1 to 3, wherein the film is co-extruded in order, and the base film and the non-adsorbable sealant film are extrusion laminated.
The invention according to claim 5 is a packaging material in which a base film and a non-adsorptive sealant film are sequentially laminated, and the non-adsorptive sealant film is made of polyolefin resin / adhesive resin / acrylonitrile copolymer resin. The method for producing a non-adsorbing packaging material according to any one of claims 1 to 3, wherein the non-adsorbing packaging material according to any one of claims 1 to 3, wherein the base film and the non-adsorbing sealant film are co-extruded to form a neram laminate. .

  As described above, according to the present invention, a packaging material in which a base film and a non-adsorptive sealant film are sequentially laminated, wherein the non-adsorptive sealant film is a polyolefin resin / adhesive resin / acrylonitrile copolymer resin. The polyolefin resin, adhesive resin, and acrylonitrile copolymer resin are laminated in order, and the melt viscosity at a temperature of 200 (° C.) and a shear rate of 60 (1 / s) is in the range of 1000 to 6000 (Pa · s). In addition, by setting the difference in melt viscosity of each resin to 1000 (Pa · s) or less, a non-adsorbable sealant film obtained by multilayer coextrusion film formation of a plurality of types of resins including acrylonitrile copolymer, flow marks, wrapping phenomenon, etc. High quality can be maintained without causing any defects.

  Further, according to the method for producing a non-adsorbing packaging material of the present invention, since the base film and the non-adsorbing sealant multilayer co-extruded film are co-extruded laminated or knee laminated in the same step, There is no need to laminate the non-adsorbing sealant film in a separate process, and the manufacturing cost of the packaging material can be reduced.

  In addition, by forming a base film as a stretched film and forming a print layer on the surface of the base film on which the non-adsorbent sealant film is laminated, the print layer is protected and a packaging material suitable for packaging pharmaceuticals and the like is obtained. . Furthermore, since it prints on the smooth stretched film surface, a printing layer with high designability can be formed.

It is sectional drawing which shows one Example of the packaging material of this invention. It is a graph which shows the result of having measured the flurbiprofen adsorption amount of the packaging material of Examples 1, 2 and Comparative Examples 1, 2 by HPLC (liquid chromatography).

  Next, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the non-adsorbing packaging material of the present invention is a packaging material in which a base film 1 and a non-adsorbing sealant film 2 are sequentially laminated, and the non-adsorbing sealant film 2 is a polyolefin resin 3. Co-extrusion film formation is performed in the order of: / adhesive resin 4 / acrylonitrile copolymer resin 5.

  The base film 1 is a main layer of the packaging material, and gives the packaging material properties such as mechanical strength, tear properties, slip properties, and heat resistance. As a preferable material, a material excellent in mechanical strength such as a polyester film such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, 6-nylon; polyamide film such as 6,6-nylon, or polypropylene film can be used. . In particular, it is preferable to use these uniaxially or biaxially stretched films. Moreover, well-known additives; for example, an antistatic agent, a slip agent, an antifogging agent, an ultraviolet absorber, etc. can be added to these films as needed. Moreover, a well-known process; for example, a corona discharge process, an ozone process, a flame process etc. can be performed as needed.

  The thickness of the base film 1 is not particularly limited, but is preferably 12 to 40 μm.

  Although the printing layer 6 is usually formed on the packaging material, it is preferably formed on the surface of the base film 1 on which the non-adsorptive sealant film 2 is laminated as shown in the figure.

  The method for forming the printing layer 6 is not particularly limited, and may be appropriately selected from various printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, ink jet printing, and pad printing.

In addition, the base film 1 has a two-layer configuration in which paper or a nonwoven fabric (basis weight 15 to 90 g / m ² ) is laminated on the outer surface side or inner surface side of the film for the purpose of imparting texture or rigidity, and the content A two-layer structure in which an aluminum foil is laminated according to the chemical reactivity of the product can be used.

  A non-adsorptive sealant film 2 is laminated on the base film 1. The non-adsorptive sealant film 2 is composed of polyolefin resin 3 / adhesive resin 4 / acrylonitrile copolymer resin 5. According to the present invention, the polyolefin resin 3, the adhesive resin 4, and the acrylonitrile copolymer resin 5 constituting the non-adsorptive sealant film 2 have a melt viscosity at a temperature of 200 (° C.) and a shear rate of 60 (1 / s). It is preferably in the range of 1000 to 6000 (Pa · s) and the difference in melt viscosity of each resin is 1000 (Pa · s) or less.

  That is, when the melt viscosity at a temperature of 200 (° C.) and a shear rate of 60 (1 / s) of the polyolefin resin 3, the adhesive resin 4, and the acrylonitrile copolymer resin 5 is higher than 6000 (Pa · s), In the case of coextrusion film formation, a resin film breakage or the like occurs, and when the melt viscosity is lower than 1000 (Pa · s), neck-in or ear distortion occurs during coextrusion film formation. However, a film film with satisfactory quality cannot be obtained. Furthermore, when the difference in melt viscosity of each of the polyolefin resin 3, adhesive resin 4, and acrylonitrile copolymer resin 5 at a temperature of 200 (° C.) and a shear rate of 60 (1 / s) is greater than 1000 (Pa · s). In other words, the viscosity balance of each resin becomes non-uniform, and defects such as a flow mark and a wrapping phenomenon occur in the coextruded film film, and the quality is remarkably deteriorated.

  The polyolefin resin 3 is preferably a low density polyethylene or a linear low density polyethylene in consideration of coextrusion suitability with the acrylonitrile copolymer resin 5 and adhesiveness with the base film 1.

  Further, as the adhesive resin 4, it is preferable to employ a maleic anhydride-modified polyolefin adhesive resin in which adhesion between the polyolefin resin 3 and the acrylonitrile copolymer resin 5 is good.

  A known additive; for example, an antistatic agent, a slip agent, an antifogging agent, or the like may be added to each layer of the non-adsorptive sealant film 2 as necessary. Moreover, a well-known process; for example, a corona discharge process, an ozone process, a flame process etc. can be performed as needed. In particular, as described later, in the present invention, the non-adsorptive sealant film 2 is laminated from a co-extrusion laminate or a kneelam laminate. Adhesion improving treatment such as corona discharge treatment or ozone treatment is required for the non-adsorbent sealant film 2.

  The film thicknesses of the non-adsorbing sealant film 2, the polyolefin resin 3, the adhesive resin 4, and the acrylonitrile copolymer resin 5 are not particularly limited, but the polyolefin resin 3 is 10 to 20 μm, and the adhesive resin 4 is 3 to 10 μm. The acrylonitrile copolymer resin 5 is preferably 10 to 20 μm, and the non-adsorptive sealant film 2 as a laminate is preferably about 20 to 50 μm.

  The embodiment shown in FIG. 1 is obtained by coextruding and knee laminating a non-adsorbing sealant film 2 on a base film 1. Prior to lamination, application of an anchor coating agent to the laminated surface and pretreatment (corona treatment, ozone treatment, etc.) can be performed as necessary. In addition, the method of coextrusion lamination and knee lamb lamination may be performed by a conventional method and can be easily determined by those skilled in the art.

  By applying co-extrusion laminating and knee laminating as described above, it is possible to omit the process for the purpose of adhering each film, such as dry laminating, which has been widely used in the past, thus reducing the manufacturing cost of packaging materials. Can do.

  Specific examples of the non-adsorbing packaging material of the present invention will be described below, but the present invention is not limited to these examples.

A biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm was used as the base film, and a printing layer was formed on the base film with an ink using a polyurethane resin as a vehicle. On this printed layer, an anchor coating agent composed mainly of a polyurethane resin was applied at a coating amount of 4 g / m ² . Further, a linear low-density polyethylene resin [melting viscosity 1700 (Pa · s); 200 (° C.), shear rate 60 (1 / s)] as a polyolefin resin is 15 μm by a three-type three-layer coextrusion machine. / Acid-modified polyolefin resin [melt viscosity 1300 (Pa · s); 200 (° C.), shear rate 60 (1 / s)] as an adhesive resin is 5 μm / acrylonitrile copolymer resin [melt viscosity 1600 (Pa · s) ); 200 (° C.), shear rate 60 (1 / s)] was coextruded at an extrusion temperature of 200 (° C.) to form a non-adsorbable sealant film at 10 μm. Laminate the base film and non-adsorptive sealant film by extrusion lamination so that the surface of the chain low density polyethylene resin is laminated to the base film. To obtain a non-adsorbing packaging material of the present invention.

In Example 1, when laminating the base film and the non-adsorptive sealant film, the non-adsorptive packaging material of the present invention was obtained in the same manner as Example 1 except that the extrusion laminate was changed to the nelam laminate. .
[Comparative Example 1]

A printing layer was formed on a biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm with an ink using a polyurethane resin as a vehicle. On this printed layer, an anchor coating agent mainly composed of a polyurethane resin is applied at an application amount of 4 g / m ² , and an acrylonitrile copolymer film (Tamapoly Co., Ltd. “Hytron BX”) having a thickness of 30 μm is used as a sealant. A dry laminate film was obtained by bonding together.
[Comparative Example 2]

A printing layer was formed on a biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm with an ink using a polyurethane resin as a vehicle. On this printed layer, an anchor coating agent composed mainly of a polyurethane-based resin was applied at a coating amount of 4 g / m ² , and a 30 μm-thick linear low-density polyethylene film (Nimura Chemical Co., Ltd. “ A dry laminate film bonded with XMTN ") was obtained.
[Comparative Example 3]

  In Example 1, a linear low density polyethylene resin constituting a non-adsorptive sealant film [melt viscosity 1700 (Pa · s); 200 (° C.), shear rate 60 (1 / s)] 15 μm was reduced to low density polyethylene. A non-adsorbing packaging material was obtained in the same manner as in Example 1 except that the resin [melt viscosity: 600 (Pa · s); 200 (° C.), shear rate: 60 (1 / s)] was 15 μm.

  The non-adsorbent packaging materials obtained in Examples 1 and 2 and Comparative Example 3 were examined for appearance and cross-sectional film thickness in the width direction.

  As a result, no abnormalities were found in both appearance and film thickness for Examples 1 and 2, and good visibility was maintained for the printed layer of the base film, but in Comparative Example 3 due to the enveloping phenomenon of polyethylene resin The acrylonitrile copolymer resin and the adhesive resin are close to the center in the width direction of the film, the polyethylene resin escapes to the outer periphery, and the thickness distribution in the width direction becomes non-uniform, so the printed layer of the base film is also distorted. As a result, a satisfactory quality packaging material could not be obtained.

  Further, after packaging the contents in bags made using the packaging materials of Examples 1 and 2 and Comparative Examples 1 and 2, actual packaging and storage tests were conducted for the purpose of evaluating non-adsorption.

  The packaging materials of Examples 1 and 2 and Comparative Examples 1 and 2 are cut into a predetermined size, and the sealant film is opposed to the inner surface to heat-seal the three sides into a bag shape. Seven patches containing 20 mg of fen (Mikasa Pharmaceutical Co., Ltd. Zepolus tape) were inserted, and the openings were heat sealed and sealed. Further, they were stored for 744 hours under a temperature and humidity of 40 ° C. and 75% RH, and then the amount of flurbiprofen adsorbed per unit area of the bag was measured by HPLC (liquid chromatography). The results are shown in FIG.

  As is clear from the results of FIG. 2, Examples 1 and 2 and Comparative Example 1 were excellent in flurbiprofen non-adsorbability. Furthermore, there was no difference in the non-adsorbability between Examples 1 and 2 and Comparative Example 1. On the other hand, in Comparative Example 2, it can be seen that the adsorption of the drug is significant and does not serve as a non-adsorbing packaging material.

  From the above, the non-adsorbing packaging material of the present invention is free from the occurrence of defects such as flow marks and wrapping phenomenon in the non-adsorbing sealant film formed by multilayer coextrusion film formation of plural kinds of resins including acrylonitrile copolymer. High quality can be maintained.

  In addition, the base film and the non-adsorptive sealant multilayer co-extruded film are in the same process while maintaining the same non-adsorption performance as the non-adsorptive packaging material laminated with the base film and the non-adsorptive sealant film in separate processes. By co-extrusion laminating or knee lamb laminating, the manufacturing cost of the packaging material can be reduced.

  In addition, by forming a base film as a stretched film and forming a print layer on the surface of the base film on which the non-adsorbent sealant film is laminated, the print layer is protected and a packaging material suitable for packaging pharmaceuticals and the like is obtained. . Furthermore, since it prints on the smooth stretched film surface, a printing layer with high designability can be formed.

DESCRIPTION OF SYMBOLS 1 ... Base film 2 ... Non-adsorptive sealant film 3 ... Polyolefin resin 4 ... Adhesive resin 5 ... Acrylonitrile copolymer resin 6. .... Printing layer

Claims (5)

  A non-adsorbing packaging material in which a base film and a non-adsorbing sealant film are sequentially laminated, wherein the non-adsorbing sealant film is laminated in the order of polyolefin resin / adhesive resin / acrylonitrile copolymer resin; The polyolefin resin, adhesive resin and acrylonitrile copolymer resin have a melt viscosity at a temperature of 200 (° C.) and a shear rate of 60 (1 / s) in the range of 1000 to 6000 (Pa · s), and the respective melts. A non-adsorbent packaging material having a viscosity difference of 1000 (Pa · s) or less.   The non-adsorptive sealant film is composed of a polyolefin resin / adhesive resin / acrylonitrile copolymer resin, and the polyolefin resin surface of the non-adsorptive sealant film is laminated on the base film. The non-adsorbent packaging material according to claim 1.   The non-adsorbing property according to claim 1 or 2, wherein the base film is a stretched film, and a printed layer is formed on a surface of the base film on which the non-adsorbing sealant film is laminated. Packaging material.   A packaging material in which a base film and a non-adsorptive sealant film are sequentially laminated, wherein the non-adsorptive sealant film is coextruded into a polyolefin resin / adhesive resin / acrylonitrile copolymer resin in this order, The method for producing a non-adsorbing packaging material according to any one of claims 1 to 3, wherein the material film and the non-adsorbing sealant film are extrusion laminated.   A packaging material in which a base film and a non-adsorptive sealant film are sequentially laminated, wherein the non-adsorptive sealant film is coextruded into a polyolefin resin / adhesive resin / acrylonitrile copolymer resin in this order, The method for producing a non-adsorbing packaging material according to any one of claims 1 to 3, wherein a material film and the non-adsorbing sealant film are laminated with a neram.

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