JP6808431B2 - Laminated bottle - Google Patents

Description

The present invention relates to laminated bottles.

Conventionally, as a container for accommodating a lotion, for example, a resin bottle to which a pearl-like luster (pearl luster) is imparted by adding a pearl pigment such as mica or titanium to the resin material forming the wall body. It has been known. In addition, various attempts have been made to obtain pearl luster while avoiding the use of expensive pearl pigments. For example, Patent Document 1 describes a resin bottle in which pearl luster is generated by innumerable minute voids generated in the wall body during blow molding.

Japanese Unexamined Patent Publication No. 2012-250713

In addition, we have also developed a resin bottle that produces pearl luster by forming a wall body with a mixed resin material in which polyethylene terephthalate and a resin other than polyethylene terephthalate (for example, polyethylene naphthalate or polypropylene) are mixed. Various attempts have been made. The pearl luster developed by such mixing of resin materials can give a fine and deep pearl luster that cannot be obtained with pearl pigments. However, the impact resistance of the bottle made by mixing the resin materials is significantly inferior, and it is difficult to secure a practical level of impact resistance.

The present invention has been developed in view of such a problem, and an object of the present invention is to provide a laminated bottle having both pearl luster developed by mixing resin materials and impact resistance at a practical level.

Layered bottle according to the present invention is mainly composed of polyethylene terephthalate, possess an outer layer formed by mixing a resin material resin other than polyethylene terephthalate are mixed, and the innermost layer formed by a polyolefin resin, a
The outer layer has a thickness of 70 to 400 μm in the bottle body and has a thickness of 70 to 400 μm.
The innermost layer has a thickness of 400 μm or more in the bottle body and has a thickness of 400 μm or more.
The polyolefin-based resin is characterized by being polypropylene .

Further, in the laminated bottle according to the present invention, it is preferable that the mixed resin material contains polyethylene terephthalate as a main component and is mixed with polyethylene naphthalate.

Further, in the laminated bottle according to the present invention, the compounding ratio of the polyethylene terephthalate and the polyethylene naphthalate is preferably 5: 5 to 7: 3 in terms of mass ratio.

Further, in the laminated bottle according to the present invention, the innermost layer is formed of a polyolefin resin to which a coloring material is added, and the outer layer has a translucency so that the colored layer of the innermost layer can be visually recognized. preferable.

Further, in the laminated bottle according to the present invention, it is preferable that the glossiness of the outer surface of the bottle body is 92 to 101.

According to the present invention, it is possible to provide a laminated bottle having both pearl luster developed by mixing resin materials and impact resistance at a practical level.

It is a figure which shows the laminated bottle which concerns on one Embodiment of this invention, (a) is a partial cross-sectional side view, (b) is a partially enlarged view of (a).

Hereinafter, the laminated bottle according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the laminated bottle 1 according to the present embodiment has a tubular mouth portion 2 connected to a storage space capable of accommodating contents such as a liquid such as a lotion, and a tubular mouth portion 2 connected to the mouth portion 2. It has a bottle shape including a body portion (bottle body portion) 3 having a diameter larger than that of the mouth portion 2 and a bottom portion 4 that closes the lower end of the body portion 3. The laminated bottle 1 has an outer layer 5 formed of a mixed resin material containing polyethylene terephthalate (hereinafter, also referred to as PET) as a main component and a resin other than PET mixed, and an innermost layer 6 formed of a polyolefin resin. And have. An adhesive layer 7 can be appropriately provided between the outer layer 5 and the innermost layer 6 as in the present embodiment. The adhesive layer 7 can be formed from, for example, an adhesive polyolefin resin. Examples of the adhesive polyolefin resin include resins in which a polar group is introduced into a polyolefin resin such as a polyethylene resin or a polypropylene resin (for example, "Admer" manufactured by Mitsui Chemicals Co., Ltd.).

The mixed resin material contains PET as a main component and is mixed with polyethylene naphthalate (hereinafter, also referred to as PEN). However, the resin mixed in PET is not limited to PEN. In order to obtain good pearl luster, the resin mixed with PET is preferably a resin having no compatibility with PET or molding conditions that are not compatible with PET, and the colored layer of the innermost layer 6 is visible. It is more preferable to have translucency that can be achieved. Since both PET and PEN are polyester resins, a reaction called transesterification may occur and be compatible with each other depending on the molding conditions, but molding conditions that do not cause this reaction (for example, 260 in the case of EBM molding). A good pearl luster can be exhibited by molding by extruding parison at ° C.). Further, since the outer layer 7 has translucency, the pearl luster can be enhanced by the hue of the innermost layer 6 to which the coloring material is added.

Further, in order to obtain a good pearl luster, the blending ratio of PET and PEN is preferably 5: 5 to 7: 3 in terms of mass ratio. If it deviates from this mass ratio, the pearl luster as a container decreases. A transparent outermost layer or the like may be appropriately provided on the outside of the outer layer 5.

The innermost layer 6 is formed of a polyolefin resin to which a coloring material is added. By adding the coloring material to the innermost layer 6 in this way, the bottle can be colored while maintaining a good pearl luster. Further, in order to ensure good impact resistance, high-density polyethylene, medium-density polyethylene, low-density potyethylene, polypropylene, etc. can be selected as the polyolefin resin forming the innermost layer 6, and the impact strength required for the container and the impact strength required for the container can be selected. It can be selected according to the rigidity and strength of the body portion 3.

The outer layer 5 preferably has a thickness of 70 to 400 μm in the body portion 3. This is because if it is less than 70 μm, it becomes difficult to obtain a good pearl glossiness, and if it exceeds 400 μm, the wall body of the body 3 becomes too thick and the translucency is lowered, so that the pearl glossiness is lowered. The innermost layer 6 preferably has a thickness of 400 μm or more in the body portion 3. This is because it is difficult to obtain good impact resistance if the thickness is less than 400 μm.

Further, the glossiness of the outer surface of the body portion 3 is preferably 92 to 101. Within such a range, good pearl luster can be obtained. Here, the term "glossiness" as used herein means what is measured at an incident angle of 60 ° in accordance with JIS Z 8741. That is, the glossiness Gs is expressed by the following formula.
Gs = (φs / φos) x 100%
However, φs is a specular reflected light beam from the sample surface measured at an incident angle θ = 60 °, and φos is a glass surface having a refractive index n = 1.567 measured at an incident angle θ = 60 °. It is a specular reflected light beam of.

The laminated bottle 1 can be formed by blow molding such as biaxial stretching blow molding in which a hollow product is formed from a preform (container material) formed in a bottomed tubular shape. Instead of blow molding by such preform, EBM molding (Extrusion Blow Molding) in which synthetic resin materials of each layer are laminated, extruded into a tube shape, sandwiched between molds, and air is blown into the inside to form a hollow product. It may be formed by a blow molding method).

According to the laminated bottle 1 according to the present embodiment described above, the outer layer 5 formed of a mixed resin material containing PET as a main component and a resin other than PET is mixed, and the innermost layer formed of a polyolefin resin. Since it has 6, it is possible to obtain both the pearl luster developed by mixing the resin materials and the impact resistance at a practical level.

Although various embodiments of the present invention have been described above, it goes without saying that the above description is merely an example of the embodiments of the present invention, and various modifications may be made as long as the gist of the invention is not deviated. No.

As the laminated bottle of the present invention, an outer layer formed of a mixed resin material containing PET as a main component and mixed with PEN, an innermost layer formed of polypropylene (hereinafter, also referred to as PP), and an adhesive layer as an intermediate layer. The laminated bottle of the example composed of the three layers of the above was produced. In the laminated bottle of the example, KS710B-8S and KS710B-9 manufactured by Kuraray Co., Ltd. and SA-8369P manufactured by Unitika Co., Ltd. were used as PET, TN-8065S manufactured by Teijin Co., Ltd. was used as PEN, and Prime Polymer Co., Ltd. The compounding ratio of PET and PEN was 5: 5, 6: 4, 7: 3, and a green masterbatch was added to the innermost PP for coloring. Drop impact, glossiness and pearl glossiness were evaluated for the laminated bottles of Examples using such various materials and compounding ratios. The production and evaluation were mainly carried out with a compounding ratio of 6: 4. The thickness of the layer in the body of the example was 100 μm for the outer layer, 100 μm for the adhesive layer, and 700 μm for the innermost layer.

Further, as a bottle of the comparative example, a single-layer bottle was produced by adding a green masterbatch to a mixed material of PET and PEN and coloring the bottle. In the single-layer bottle of the comparative example, KS710B-4 manufactured by Kuraray Co., Ltd. was used as the PET, TN-8065S manufactured by Teijin Co., Ltd. was used as the PEN, and the blending ratio of PET and PEN was 6: 4, 5: 5, 4: 6. And said. With respect to the single-layer bottles of Comparative Examples using such various materials and compounding ratios, the drop impact, glossiness and pearl glossiness were evaluated under the same conditions as in Examples. Further, the thickness of the layer in the body portion of the comparative example was set to 900 μm in which the thickness of the wall body was the same as that of the example.

In the drop impact test, the bottle was dropped from a height of 1 m at an atmospheric temperature of 5 ° C. with water contained and the lid closed. The drop was made by dropping the bottle from a vertically oriented state and then dropping the bottle in a horizontally oriented state to make one set, and continued until 10 sets or damage occurred.

In the examples, none of the manufactured bottles withstood 10 sets of drops and was not damaged. On the other hand, in the comparative example, the bottles produced were damaged in 1 to 3 sets. The glossiness of the body surface was 92 to 101 in the examples, whereas it was 88 to 107 in the comparative examples, all of which were good results. The pearl luster was visually evaluated and was good in both Examples and Comparative Examples, but it was confirmed that the examples provide a deeper and deeper pearl luster. Was done.

From the above results, the laminated bottle of the example is good because it has an outer layer formed of a mixed resin material containing PET as a main component and a PEN mixed, and an innermost layer formed of a polyolefin resin. It is presumed that both pearl luster and impact resistance were obtained. Further, in addition to such a configuration, it is presumed that the innermost layer was colored and the outer layer was made translucent, so that a deeper sense of depth and a deeper pearl luster were obtained.

1 Laminated bottle 2 Mouth 3 Body (bottle body)
4 Bottom 5 Outer layer 6 Innermost layer 7 Adhesive layer

Claims (5)

It has an outer layer formed of a mixed resin material containing polyethylene terephthalate as a main component and a resin other than polyethylene terephthalate mixed, and an innermost layer formed of a polyolefin resin.
The outer layer has a thickness of 70 to 400 μm in the bottle body and has a thickness of 70 to 400 μm.
The innermost layer, have a 400μm thick or thicker in bottle body portion,
A laminated bottle in which the polyolefin-based resin is polypropylene . The laminated bottle according to claim 1, wherein the mixed resin material contains polyethylene terephthalate as a main component and is mixed with polyethylene naphthalate. The laminated bottle according to claim 2, wherein the compounding ratio of the polyethylene terephthalate and the polyethylene naphthalate is 5: 5 to 7: 3 in mass ratio. The innermost layer is formed by the polyolefin resin colorant is added,
The laminated bottle according to any one of claims 1 to 3, wherein the outer layer has translucency so that the colored layer of the innermost layer can be visually recognized. The laminated bottle according to any one of claims 1 to 4, wherein the glossiness of the outer surface of the bottle body is 92 to 101.

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