JPH0966924A - Light shielding type container of 5-layer structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container which is superior in light shielding property, has make the surface a brighter tone, and has a thin thickness by using a five- layer-laminated material of a thermoplastic resin consisting of an innermost layer, an internal layer and an external layer which contain a hiding component, an intermediate layer which contains a light-shielding component, and an outermost layer. SOLUTION: A light shielding container is formed of a thermoplastic resin with five layers in which an innermost layer 5, an internal hiding layer 6 which contains a hiding component, a light-shielding layer 7 which contains a light- shielding component, an external hiding layer 8 which contains a hiding component, and an outermost layer 9 are laminated in this order. In this light shielding container of the five-layer structure, each layer is formed of a thermoplastic resin layer, and the container can be formed into a bottle shape, etc., by a blow-molding, etc., and the light shielding property can be imparted on the whole surface. In addition, the color of a content can be hidden by the internal layer 6, and at the same time, the color of the intermediate layer 7, which is a dark color tone, can be hidden by the external layer 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 5-layer light-shielding container for containing cosmetics and the like.

[0002]

2. Description of the Related Art Conventionally, in various containers such as squeeze bottles, in order to prevent deterioration of contents due to light rays such as ultraviolet rays,
It has a light blocking effect. As such a container, there is a multi-layer plastic container disclosed in JP-A-6-255052. This multi-layered plastic container is a three-layered or four-layered multi-layered plastic container, the outermost layer of which is made of uncolored polypropylene random copolymer,
Inside thereof, a concealing layer in which titanium white is added to a polypropylene block copolymer and a light shielding layer in which carbon black is added to a polypropylene block copolymer are provided.

[0003]

However, this one has a light transmittance of 0.37% to 0.45%, and does not have a sufficient light-shielding property. Moreover, in the light-shielding layer in the minimum thickness portion of the container, the relationship between C: carbon black content ratio (wt%) and T: thickness of the light-shielding layer (mm) is C ×.
T ≧ 0.1 is set. For this reason, when the thickness of the light-shielding layer is reduced, the carbon black content ratio is increased and the degree of dark color of the light-shielding layer is increased, which cannot be concealed only by the concealment layer and the container surface becomes grayish. There is a problem. On the other hand, when the carbon black content ratio is reduced and the thickness of the light shielding layer is increased, the thickness of the entire container is increased, the squeeze property is deteriorated, and it is difficult to take out the contents.

The present invention has been made in view of the above circumstances, and provides a light-shielding container having an excellent light-shielding property, capable of forming a light-colored container surface, and having a thin five-layer structure. Is its purpose.

[0005]

To achieve the above object, a light-shielding container having a five-layer structure of the present invention comprises five thermoplastic resin layers, an innermost layer and an inner layer containing a concealing component. A layer, an intermediate layer containing a light-shielding component, an outer layer containing a hiding component, and an outermost layer are laminated in this order.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION That is, the present inventor has conducted a series of studies to obtain a container excellent in light-shielding property, and as a result,
5 layers of thermoplastic resin layers, an innermost layer, an inner layer containing a hiding component, an intermediate layer containing a light-shielding component,
A light-shielding container in which an outer layer containing a concealing component and an outermost layer are laminated in this order is excellent in light-shielding property, and the container surface can be light-colored, and the light-shielding property is thin. The inventors arrived at the present invention by discovering that a container can be manufactured. Like this 5-layer light-shielding container,
When each layer is formed of a thermoplastic resin layer, it can be molded into a bottle shape or the like by blow molding or the like, whereby light shielding properties can be imparted to the entire surface. Also,
Since it has a five-layer structure, it has excellent light-shielding properties and high strength. Moreover, the color of the contents can be hidden by the inner layer, and the color of the intermediate layer, which has a dark shade due to the light-shielding component such as carbon black, can be hidden by the outer layer. In particular, when the inner layer, the outer layer and the outermost layer are colored in a light color system, there is a hiding effect in the outermost layer as well as the hiding effect in the inner layer and the outer layer, and the light color of the outermost layer. The system and the light color system of the outer layer coincide with each other, and the container surface can be made to be a completely light color system. Furthermore, since it is not necessary to color the innermost layer, it is not necessary to incorporate a pigment, and the cost can be reduced. Further, in the light-shielding container having the five-layer structure of the present invention, the intermediate layer in the minimum thickness portion of the container is
The relationship between C: carbon black content ratio (wt%) and T: thickness of the light shielding layer (mm) can be set to 0.1 ≧ C × T ≧ 0.02. Therefore, the carbon black content ratio can be reduced to weaken the degree of dark color of the light shielding layer, which facilitates making the container surface a bright color system. Moreover, the thickness of the light-shielding layer can be reduced, which reduces the thickness of the entire container and improves the squeeze property, making it easier to take out the contents. Further, in the present invention, when the intermediate layer also contains a hiding component, the hiding effect is very excellent, and when titanium white or the like is used as the hiding component, the light-coloring property is also excellent.

The five-layer light-shielding container of the present invention will be described in detail.

The light-shielding container having the above-mentioned five-layer structure is composed of five thermoplastic resin layers and comprises an innermost layer, inner and outer layers containing a concealing component, and an intermediate layer containing a light-shielding component. It consists of the outermost layer.

Examples of the thermoplastic resin include polyethylene, polypropylene, polystyrene, polyvinyl acetate,
Examples thereof include polyvinyl alcohol, polycarbonate, polyamide (nylon), polyvinyl chloride and the like.

As the above-mentioned concealing component, titanium white,
Examples thereof include titanium oxide such as titanium yellow and titanium black. When the constituents of the inner layer and the outer layer containing such a concealing component are the same, a structure of four layers and five layers can be used.

Examples of the light-shielding component include carbon black. In addition, ultraviolet absorbers such as salicylic acid-based ultraviolet absorbers, benzophenol-based ultraviolet absorbers, and benzotriazole-based ultraviolet absorbers can be used.

It is conceivable that the outermost layer contains a white pigment component such as titanium white or a pearl pigment component.

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

[0014]

First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention. In the figure, 1 is a cosmetic (not shown) inside
Is a light-shielding bottle having a squeeze property containing
Reference numeral 2 is a cap screwed onto the bottle 1. The bottle 1 is formed by blow molding, and as shown in FIGS. 3 and 4, an oval bottomed cylindrical body 1a.
And a neck 1b. And as shown in FIG.
The threaded portion 2a formed on the inner peripheral surface of the cap 2 is screwed to the threaded portion formed on the outer peripheral surface of the neck portion 1b, and the step portion 1c provided on the shoulder of the body portion 1a has 6 and a shoulder ring 3 as shown in FIG. 7 is detachably attached. In FIG. 5, reference numeral 4 denotes an inner plug. As shown in FIG. 8, such a bottle 1 has an innermost layer 5, an inner hiding layer (inner layer) 6, a light-shielding layer (intermediate layer) 7, and an outer hiding layer (outer layer).
It is formed in a five-layer structure including 8 and the outermost layer 9. That is, the innermost layer 5 is not colored and is made of polypropylene resin. The inner hiding layer 6 and the outer hiding layer 8 are colored white and are made of polypropylene resin containing 5% by weight of titanium white. The light shielding layer 7 is made of polypropylene resin containing 0.132 wt% of carbon black. The outermost layer 9 is made of polypropylene resin colored in a pearl color. In addition, each part (a) to (f) on the front and side surfaces of this bottle 1
The wall thicknesses (see FIGS. 4 and 9) are shown in Tables 1 and 2.

[0015]

[Table 1]

[0016]

[Table 2]

According to the first embodiment described above, by blow molding, it is possible to impart light-shielding properties to the entire surface. The light transmittance is 0 over the entire range from ultraviolet to visible.
%, And the light-shielding property is perfect (the light transmittance was measured in accordance with JIS K7105-1981).
In addition, the pinch-off portion is very strong practically, and there is no problem with respect to a drop impact or when left in a vacuum. Further, the color becomes white (bright color) which is preferable as a bottle for cosmetics, and the sense of cleanliness overflows. In addition, since it is not necessary to include the pigment in the innermost layer 4, there is an effect of cost reduction. Further, in the light-shielding layer 7 in the minimum thickness portion (b on the side surface), C × T = 0.0264 (0.132w
t% × 0.2 mm). In this way, the carbon black content is low, and the container surface is a light color system (white or light color).
The light-shielding layer 7 is thin and the squeeze property is improved.

[0018]

Second Embodiment A second embodiment of the present invention will be described. In the second embodiment, the body 1a of the bottle 1 shown in FIG. 3 is formed in a circular shape. The innermost layer 5, inner hiding layer (inner layer) 6, light-shielding layer (intermediate layer) 7, outer hiding layer (outer layer) 8 and outermost layer 9 of this bottle 1 have the same construction as in the above-mentioned embodiment. There is. Tables 3 and 4 show the wall thicknesses of the respective parts (a) to (f) on the front and side surfaces of the bottle 1. Also in this Example 2, C × T = 0.0264 (0.132) in the light-shielding layer 7 in the minimum thickness portion (e on the side surface).
wt% × 0.2 mm).

[0019]

[Table 3]

[0020]

[Table 4]

[0021]

Third Embodiment FIG. 10 shows a third embodiment of the present invention. In the third embodiment, the adhesive layers 10 to 13 are provided between the layers 5 to 9 of the first embodiment. Also in this case,
The bottle 1 is molded by blow molding. As the adhesive constituting the adhesive layers 10 to 13, an adhesive polyolefin resin (Mitsui Petrochemical Co., Ltd., Admer HB030) is used.
Is used. According to this Example 3, the adhesion between the layers 5 to 9 is excellent, and peeling is difficult.

[0022]

Fourth Embodiment In the first embodiment, the light shielding layer 7 is
Carbon black 0.1 wt% in polypropylene resin
It is composed of what is contained. In this case, the light transmittance was 0%. Other than that is the same as the first embodiment.

[0023]

Fifth Embodiment In the above first embodiment, the light shielding layer 7 is
0.08wt of carbon black in polypropylene resin
% Contained. In this case, the light transmittance was 0.15%. Other than that is the same as the first embodiment.

[0024]

Sixth Embodiment In the first embodiment, the light shielding layer 7 is
0.05 wt% of carbon black in polypropylene resin
% Contained. In this case, the light transmittance was 0.21%. Other than that is the same as the first embodiment.

[0025]

Seventh Embodiment In the first embodiment, the light shielding layer 7 is
Carbon black 0.132w on polypropylene resin
t%, and titanium white 1 to 4 wt%
It is composed of what is contained. In this case, a container having a light transmittance of 0% and a whiter and more clean feeling than those of Examples 1 to 6 was produced. Other than that is the same as the first embodiment.

[0026]

As described above, according to the light-shielding container having the five-layer structure of the present invention, the light-shielding property is excellent, the container surface can be made a light color system, and the light-shielding property is thin. The container can be made. Further, since each layer is formed of the thermoplastic resin layer, it can be molded into a bottle shape or the like by blow molding or the like, whereby light shielding properties can be imparted to the entire surface. Moreover, the color of the contents can be hidden by the inner layer, and the color of the intermediate layer, which has a dark shade due to the light-shielding component such as carbon black, can be hidden by the outer layer. In particular, when the inner layer, the outer layer and the outermost layer are colored in a light color system, there is a hiding effect in the outermost layer as well as the hiding effect in the inner layer and the outer layer, and the light color of the outermost layer. The system and the light color system of the outer layer coincide with each other, and the container surface can be made to be a completely light color system. Furthermore, since it is not necessary to color the innermost layer, it is not necessary to incorporate a pigment, and the cost can be reduced. Further, in the light-shielding container having a five-layer structure of the present invention, the C: carbon black content ratio (wt
%) And T: the relationship between the thickness (mm) of the light shielding layer is 0.1 ≧ C
It can be set to × T ≧ 0.02. Therefore, the carbon black content ratio can be reduced to weaken the degree of dark color of the light shielding layer, which facilitates making the container surface a bright color system. Moreover, the thickness of the light-shielding layer can be reduced, which reduces the thickness of the entire container and improves the squeeze property, making it easier to take out the contents. Further, in the present invention, when the intermediate layer also contains a hiding component, the hiding effect is very excellent, and when titanium white or the like is used as the hiding component, excellent light-coloring property is obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a light-shielding container of the present invention.

FIG. 2 is a plan view of the light-shielding container.

FIG. 3 is a front view of the bottle.

FIG. 4 is a plan view of the bottle.

FIG. 5 is a sectional view of a main part of the light-shielding container.

FIG. 6 is a front view of a shoulder ring.

FIG. 7 is a plan view of a shoulder ring.

FIG. 8 is an explanatory diagram of a five-layer structure of the bottle.

FIG. 9 is a cross-sectional view of the bottle.

FIG. 10 is an explanatory diagram of a five-layer structure showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Bottle 2 Cap 5 Innermost Layer 6 Inner Concealing Layer 7 Light-shielding Layer 8 Outer Concealing Layer 9 Outermost Layer

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 27/20 B32B 27/20 A

Claims (4)

[Claims] 1. A thermoplastic resin layer comprising 5 layers, an innermost layer, an inner layer containing a hiding component, an intermediate layer containing a light-shielding component, an outer layer containing a hiding component, and an outermost layer. A light-shielding container having a five-layer structure, wherein an outer layer is laminated in that order. 2. The light-shielding container having a five-layer structure according to claim 1, wherein an adhesive layer is formed between each layer. 3. The light-shielding container having a five-layer structure according to claim 1, wherein the inner layer, the outer layer and the outermost layer are colored in a light color system. 4. The light-shielding container having a five-layer structure according to claim 1, wherein the intermediate layer also contains a concealing component.