JP2007181969A - Ultraviolet ray cutting film and container using the film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet ray cutting film which is transparent to make contents indications be read without assuming a yellowish color characteristic of a film cutting ultraviolet and near-ultraviolet rays, prevents the occurrence of a pinhole during heating/molding and even in a transportation process after the contents are packed, and is superior in easily tearing properties, straight line-cutting properties, dimensional stability after film-making, heat resistance, chemical resistance, and water vapor-barrier properties and a container using the film. <P>SOLUTION: The ultraviolet ray cutting film includes at least an ultraviolet absorber-mixed layer (C) which is made of a polyolefin resin containing an ultraviolet absorber, absorbs ultraviolet rays 410 nm or below in wavelength, and has a transmittance of light 410 nm in wavelength of 25% or below, a transmittance of light 405 nm in wavelength of 5% or below, and a transmittance of light at least 600 nm in wave length of at least 45%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the field of medical pharmaceuticals and foods, the present invention has contents such that the contents are significantly deteriorated by transmitting light in the ultraviolet region (380 nm or less) and the visible light short wavelength region (380 nm to 450 nm). Suitable for packaging materials to be packaged, particularly characterized in that the injection container is pre-filled with a chemical solution, and suitable for a blister container which is a packaging form in which an internal space is provided by thermoforming, and the use thereof Related to the container.

  Conventionally, in laminated films having ultraviolet absorbing ability, laminating films printed with ink containing ultraviolet light absorbing metal oxide and organic compounds, laminating polyethylene naphthalate (PEN) film, There has been one that uses a polyolefin film having an ultraviolet absorbing ability by dispersing a metal oxide in a polyolefin resin. However, due to the UV absorber used, its UV absorption ability is effective at 380 nm or less, and its effect is poor in the visible light short wavelength region of 380 nm to 405 nm, or when it is thermoformed. Some of the effects were halved, and some were not suitable for thermoforming.

  For this reason, the contents have been prevented from being deteriorated by printing ink that absorbs the near-ultraviolet region or using a colored polyolefin resin. However, since the near-ultraviolet region is absorbed by coloring, it is difficult to understand the change in color due to deterioration of the contents, the display of the contents is difficult to read, or the contents do not have transparency that can be recognized from the outside. There was a problem that there was no suitability for thermoforming.

  Further, when an ultraviolet absorber is used, depending on the wavelength region, there is a problem that yellowishness occurs and the transparency is impaired. As a countermeasure, there is a proposal of an ultraviolet absorbing film using a fluorescent whitening agent. (For example, refer to Patent Document 1). However, the application is used by attaching to a window glass or the like, and it is not suitable for a packaging material that requires easy tearability, straight cutability, and the like.

  Then, there exists a proposal of the cyclic olefin polymer film which has the said easy tear property and was excellent in transparency. (For example, refer to Patent Document 2). There is also a proposal for a method for opening a blister container comprising a combination of a molded container and a lid. (For example, refer to Patent Document 3). In addition, there is a proposal for a blister tray film that utilizes the tear properties of ionomers. (For example, refer to Patent Document 4).

Prior art documents are shown below.
JP 2003-112391 A JP 2002-80649 A JP-A-11-334760 Japanese Patent No. 3482854

The present invention is intended to solve such problems of the prior art, and can read the content display without taking on the yellowish characteristic of films that cut the ultraviolet and near ultraviolet regions. It has transparency, does not generate pinholes at the time of thermoforming, and does not generate pinholes in the transportation process after the contents are filled. It aims at providing the ultraviolet cut film excellent in dimensional stability, heat resistance, chemical resistance, and water vapor | steam barrier property later, and a container using the same.

  The present invention has been made in order to solve the above-mentioned problems. The invention according to claim 1 of the present invention absorbs ultraviolet rays of 410 nm or less, which is made of a polyolefin resin containing an ultraviolet absorber, and has a thickness of 410 nm. At least an ultraviolet absorbent blend layer (C) having a light transmittance of 25% or less, a light transmittance of 405 nm of 5% or less, and a light transmittance of 600 nm or more of 45% or more. It is an ultraviolet cut film.

  The invention according to claim 2 of the present invention is the ultraviolet cut film according to claim 1, wherein the ultraviolet absorbent blend layer (C) has a thickness of 15 μm or more, and the polyolefin resin and the ultraviolet absorbent are (100-A): An ultraviolet cut film characterized by being mixed at a weight percentage of A and comprising A of 4 or more.

  The invention according to claim 3 of the present invention is the ultraviolet cut film according to claim 1 or 2, wherein the ultraviolet absorbent contains a fluorescent brightening agent.

  The invention according to claim 4 of the present invention is the ultraviolet cut film according to any one of claims 1 to 3, wherein the ultraviolet absorbent blend layer (C) contains 3% by weight or more of a cyclic olefin resin. It is the ultraviolet cut film characterized by this.

  The invention according to claim 5 of the present invention is a container characterized in that the ultraviolet cut film according to any one of claims 1 to 4 is used at least in part.

  The ultraviolet cut film according to the present invention uses an ultraviolet absorbent containing a fluorescent brightening agent, so that it is almost transparent and near ultraviolet without being yellowish, which is characteristic of a film that cuts the ultraviolet and near ultraviolet regions. It becomes possible to cut the area.

  Also, by blending a UV absorber with a heat-moldable polyolefin resin, if the thickness after heat molding is 10 μm or more, no pinholes are generated during heat molding and the contents are filled Even in the transportation process, UV cut can be stably satisfied without generating pinholes.

  Furthermore, by using a cyclic olefin resin, easy tearability, linear cutability, dimensional stability after film formation, heat resistance, chemical resistance, water vapor barrier properties, and heat moldability are excellent.

  An embodiment of the present invention will be described in detail based on FIG. 1 and FIG.

  FIG. 1 is a side sectional view showing one embodiment of a layer structure of an ultraviolet cut film (1) according to the present invention, and FIG. 2 is a container (2) formed using the ultraviolet cut film (1) according to the present invention. It is a sectional side view which shows one Example of the usage pattern which filled the contents (3) in and sealed with the cover material (e).

  As shown in FIG. 1, the layer structure of the ultraviolet cut film (1) of one example according to the present invention is a polyolefin resin layer (a), a cyclic olefin resin layer (b), an ultraviolet absorber blend layer (c), The cyclic olefin resin layer (b) and the polyolefin resin layer (a) are sequentially laminated.

  If the said polyolefin resin layer (a) is a low density polyethylene resin, there will be no restriction | limiting. Furthermore, the low density polyethylene resin used in the ultraviolet absorber blend layer (c) is better in film forming suitability by using the same grade of the same manufacturer and can produce a film with less curl.

  Next, for the cyclic olefin resin layer (b), Appell made by Mitsui Chemicals, Zeonore made by Nippon Zeon, Topas made by plastic, Arton made by JSR can be used, but compatible with low density polyethylene resin. In view of the above, the cyclic olefin copolymer containing an ethylene component is more desirable. In order to increase the interlayer strength between the cyclic olefin layer (b) and the other layers, the cyclic olefin layer (b) and the other layers are interposed between the layers. An adhesive resin layer (not shown) may be provided, or a modifier may be blended in the polyolefin resin.

Next, the ultraviolet absorbent blend layer (c) has a density of 0.91 to 0.94 g / cm ³ and a melt flow rate (MFR) of 1 to 40 g / 10 min. For example, it is preferable to use a low-density polyethylene resin of the same manufacturer and the same grade as the low-density polyethylene resin used for the polyolefin resin layer (a).

  As the ultraviolet absorber blended with the polyolefin resin, it is preferable to use an ultraviolet absorber described in Japanese Patent Application Laid-Open No. 2003-112391. In this case, the blend ratio of the polyolefin resin and the ultraviolet absorber is (100-A): mixed by weight% of A, and A is preferably 4 or more, and the ultraviolet absorber blend layer (C) Is preferably 15 μm or more. By blending the ultraviolet absorber with the polyolefin resin that can be heat-molded in this way, if the thickness after heat-molding is 10 μm or more, no pinhole is generated during heat-molding and the contents are filled. Even in the transporting process after being performed, the ultraviolet cut film (1) can be stably obtained without generating pinholes.

  When the thickness of the ultraviolet absorbent blend layer (C) is less than 15 μm and the contained ultraviolet absorbent is less than 4% by weight, the ultraviolet absorbent of 410 nm or less is absorbed and the light transmittance at 410 nm is 25% or less. In addition, it is difficult to satisfy the transmittance with a light transmittance of 405 nm of 5% or less and a light transmittance of 600 nm or more of 45% or more.

  Next, since the ultraviolet absorber contains a fluorescent brightening agent, it emits blue, which is a complementary color of yellow, so that it can generally exhibit transparency without being yellowish. As the fluorescent whitening agent, the fluorescent whitening agent described in JP-A-2003-112391 of Patent Document 1 described above can be preferably used.

  Next, the ultraviolet absorbent blend layer (C) contains 3% by weight or more of a cyclic olefin resin, thereby blocking the migration of the ultraviolet absorbent in the flow (MD) direction and the width (TD) direction. Easily tearable and straight cut. When the cyclic olefin resin is less than 3% by weight, the easy tearing property is remarkably lowered. In consideration of the migration (bleeding) of the ultraviolet absorber, it is desirable that the ultraviolet absorber blend layer (C) be one layer and a plurality of layers in the multilayer laminated film.

  Moreover, since the dimensional stability after film formation and heat resistance are provided by using this cyclic olefin resin, the heat moldability is also excellent. Furthermore, the ultraviolet cut film (1) having better chemical resistance and water vapor barrier properties than conventional polyethylene resins can be obtained.

By doing so, the ultraviolet absorbent blend layer (C) absorbs ultraviolet rays of 410 nm or less, the light transmittance of 410 nm is 25% or less, and the light transmittance of 405 nm is 5% or less. An ultraviolet cut film (1) having a light transmittance of 600% or more and 45% or more is obtained. In addition, since the light transmittance of 600 nm or more is 45% or more, and by using an ultraviolet absorber containing a fluorescent brightening agent, blue light, which is a complementary color of yellow, is emitted. Therefore, the contents, the contents display body, and the like can be seen through. Moreover, it is desirable to maintain the transmittance of the above-mentioned wavelength in powders and liquids containing vitamins and the like whose contents deteriorate due to transmission of visible light at short wavelengths.

FIG. 2 shows an embodiment of a usage pattern in which a container (2) molded using the ultraviolet cut film (1) according to the present invention is filled with the contents (3) and then sealed with a lid (e). It is a sectional side view.
In general, the lower film subjected to heat molding is referred to as a bottom material (d), and the upper film bonded by thermal fusion is referred to as a lid material (e). The lid material (e) comprises a printing base material layer (f), an adhesive layer (g), and a peel material layer (h). In addition, the bottom material (d) and the lid material (e) can take out the content (3) by peel-opening, and can also take out the content (3) by tearing from the notch portion. There are two kinds of opening methods.

  Hereinafter, the present invention will be described in more detail with reference to specific examples.

  The ultraviolet cut film (1) according to the present invention having the following constitution shown in FIG. 1 was produced.

<Example 1>
Polyolefin resin layer (a) (each 25 μm): Low density polyethylene resin (Mitsui Chemicals, M16P)
Cyclic olefin resin layer (b) (25 μm each): Cyclic olefin copolymer topas (
(Polyplastic Co., Ltd., 9506)
Ultraviolet absorber blend layer (c) (50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 94% by weight) and ultraviolet absorber (Fuji Photo Film Co., Ltd., JP 2003-112391, 6%) %), Total thickness: 150 μm
<Example 2>
Polyolefin resin / cyclic olefin resin blend layer (a) (b) (each 50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 90% by weight) and cyclic olefin resin (Polyplastic Co., 9506, 10) weight%)
Ultraviolet absorber blend layer (c) (50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 94% by weight) and ultraviolet absorber (Fuji Photo Film Co., Ltd., JP 2003-112391, 6 wt. %), Total thickness: 150 μm
Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
Polyolefin resin layer (a) (each 25 μm): Low density polyethylene resin (Mitsui Chemicals, M16P)
Cyclic olefin resin layer (b) (25 μm each): Cyclic olefin copolymer topas (
(Polyplastic Co., Ltd., 9506)
Ultraviolet absorber blend layer (c) (50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 97% by weight) and ultraviolet absorber (Fuji Photo Film Co., Ltd., JP-A-2003-112391), 3% %), Total thickness: 150 μm
<Comparative example 2>
Polyolefin resin / cyclic olefin resin blend layer (a) (b) (each 50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 96 wt%) and cyclic olefin resin (Polyplastics, 9506, 4) weight%)
Ultraviolet absorber blend layer (c) (50 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 94% by weight) and ultraviolet absorber (Fuji Photo Film Co., Ltd., JP 2003-112391, 6 wt. %), Total thickness: 150 μm
<Comparative Example 3>
Polyolefin resin layer (a) (45 μm each): Low density polyethylene resin (Mitsui Chemicals, M16P)
Cyclic olefin resin layer (b) (each 25 μm): Cyclic olefin copolymer Topas (Polyplastic Co., 9506)
UV absorber blend layer (c) (10 μm): low density polyethylene resin (Mitsui Chemicals, M16P, 94% by weight) and UV absorber (Fuji Photo Film Co., Ltd., JP 2003-112391, 6 wt. %), Total thickness: 150 μm
<Evaluation 1>
The light transmittance of the ultraviolet cut film (1) obtained in Examples 1 and 2 and Comparative Examples 1 to 3 was measured using the following measuring device. The results are shown in Table 1.

<Measurement of light transmittance>
Measuring instrument: UV-3100 (manufactured by Shimadzu Corporation)

表１は、可視光短波長領域の光線透過率の測定結果を記す。

Table 1 shows the measurement results of the light transmittance in the visible light short wavelength region.

<Evaluation 2>
The ultraviolet cut film (1) obtained in Examples 1 and 2 and Comparative Examples 1 to 3 was evaluated for tear strength and linear cut property by the following measurement methods. The results are shown in Table 2.

<Measurement of tear strength>
Tear strength (width direction) [N] (JIS K7128 A method): Tear rate 200 mm / min
<Measurement of linear cut performance>
Straight line cut property: Confirm linearity by visual inspection

表２は、引き裂き強度、直線カット性の測定結果を記す。

Table 2 describes the measurement results of tear strength and linear cutability.

<Comparison result>
Below, the comparative result of an Example and a comparative example is demonstrated. The ultraviolet cut film (1) obtained in Examples 1 and 2 absorbs ultraviolet rays of 410 nm or less, the light transmittance of 410 nm is 25% or less, and the light transmittance of 405 nm is 5% or less. Light transmittance of 600 nm or more has an ultraviolet cut ability of 45% or more, can cut ultraviolet and near ultraviolet regions without being yellowish, and has transparency that allows the contents and contents display to be seen through It was confirmed that it had. Moreover, it was confirmed that the tear strength was low, the linearity was good, the easy tearability, and the linear cutability were excellent. In Comparative Example 1, since the amount of the ultraviolet absorber was small, the light transmittance at 410 nm and 405 nm was high, and the ultraviolet cutting property was not good. In Comparative Example 2, since the amount of the cyclic olefin resin was small, the tear strength was high, the linearity was insufficient, and the easy tearability and the linear cutability were not good. In Comparative Example 3, the amount of the UV absorber was appropriate, but the UV absorber blend layer (c) was thin, so that the light transmittance at 410 nm and 405 nm was high, and the UV cut ability was not good.

It is a sectional side view which shows one Example of the laminated constitution of the ultraviolet cut film which concerns on this invention. It is a sectional side view which shows one Example of the usage pattern which filled the content into the container shape | molded using the ultraviolet-ray cut film which concerns on this invention, and sealed with the cover material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ultraviolet cut film 2 ... Container 3 ... Contents a ... Polyolefin resin layer b ... Cyclic olefin resin layer c ... Ultraviolet absorber blend layer d ... Bottom material e. ..Cover material f ... Printing substrate layer g ... Adhesive layer h ... Peel material layer

Claims (5)

  A polyolefin resin containing an ultraviolet absorber, which absorbs ultraviolet rays of 410 nm or less, has a light transmittance of 410 nm of 25% or less, a light transmittance of 405 nm of 5% or less, and a light transmittance of 600 nm or more. An ultraviolet cut film comprising at least an ultraviolet absorbent blend layer having a content of 45% or more.   The ultraviolet absorber blend layer has a thickness of 15 μm or more, and the polyolefin resin and the ultraviolet absorber are mixed at a weight percentage of (100-A): A, and A is 4 or more. The ultraviolet cut film according to claim 1.   The ultraviolet cut film according to claim 1 or 2, wherein the ultraviolet absorber contains a fluorescent brightening agent.   The ultraviolet cut film according to any one of claims 1 to 3, wherein the ultraviolet absorbent blend layer contains 3% by weight or more of a cyclic olefin resin.   A container characterized by using at least part of the ultraviolet cut film according to any one of claims 1 to 4.

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