JPH06199333A - Colored and multilayered blow-molded container - Google Patents

Abstract

PURPOSE:To provide a colored container which has a deep color tone, a mat feeling and a high sense. CONSTITUTION:In the title colored and multilayered blow-molded container, an external layer 6 is made of a low or high concentration polyethylene and a block polypropylene, and an internal layer 7 is made of a laminated body comprising polypropylene and coloring agent contained in it. The surface of the external layer 6 is made to be rough and pearl essence is incorporated, if necessary, in at least one of a middle layer 8 made of polypropylene, the external layer 6 and the internal layer 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored multi-layer blow-molded container, and more particularly to a colored multi-layer blow-molded container having a deep shade and a high-grade feeling.

[0002]

2. Description of the Related Art Conventionally, in a colored container, an inner layer made of a colored synthetic resin has been used as an alternative to a colored container made of a single layer which gives a flat color impression.
A colored multi-layer container having a laminated structure of outer layers made of transparent or translucent synthetic resin has been proposed.

In such a colored multi-layered container, the transparent or semi-transparent outer layer softens the color of the inner colored layer to provide a deep decorative effect. As such a colored multi-layer container, for example, one having a laminated structure of a resin layer containing a pearl essence as an outer layer and a colored resin layer as an inner layer (Japanese Patent Publication No. 53-41596), or a transparent container having a different light refractive index Alternatively, it has a laminated structure of a semitransparent outer layer and an intermediate layer and an inner layer made of a colored resin (Japanese Patent Publication No. 54-1031).
No. 8) is known.

[0004]

The multi-layered colored container has a sufficient depth as compared with the single-layered colored container, and can give a high-class feeling by the pearly luster of pearl essence. However, the tastes of consumers are gradually changing, and in particular, it is no longer possible to sufficiently deal with high-grade products with such a container. In particular, since the surface of the container gives off a cheap luster inherent in the resin regardless of the layer structure, there is a problem that the high-class feeling is impaired.

[0005]

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a colored container having a deep color tone, a matte feel, and a high-grade feel.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and in particular, the resin composition constituting the outer layer and the roughened structure, and the inner and outer layers made of a specific polymer. It is characterized by the combination of. That is, according to the present invention, it comprises a laminate having an outer layer made of low-density polyethylene or high-density polyethylene, and block polypropylene, and an inner layer made of polypropylene containing a coloring agent, and the outer layer surface is roughened. A colored multilayer blow-molded container is provided. Further, in the present invention, it is preferable to provide an intermediate layer made of polypropylene between the outer layer and the inner layer, and it is particularly preferable to add pearl essence to at least one of these layers.

[0007]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, the outer layer is made of low-density polyethylene or high-density polyethylene and block polypropylene, and the surface thereof is roughened, so that a matt feeling can be given to the container. ,
It is possible to give depth to the hue developed by the inner layer made of the colored polypropylene resin. As the polymer constituting the outer layer, among the above resins, high-density polyethylene having a melt flow rate of 0.1 to 5 g / 10 min, ethylene content of 3 to 10% by weight, and melt flow rate of 0.8 to 10 g / 10 min. Mixtures of ethylene-propylene block copolymers of are preferably used.

Further, in the present invention, by providing a natural polypropylene layer as an intermediate layer between the outer layer and the inner layer, a matt feeling and a deep hue obtained by the combination of the outer layer and the inner layer are more preferable. Can be obtained. Since natural polypropylene is transparent in itself, it is possible to give more depth without impairing the color tone of the inner layer which is the coloring layer.

Further, in the present invention, an outer layer, an intermediate layer,
By including pearl essence in at least one of the inner layers, it is possible to impart a pearly luster and further enhance the high-class feeling. In this case, in the outer layer and the inner layer, the resin constituting them may directly contain pearl essence, or a resin layer containing pearl essence may be further provided.
In order not to impair the depth obtained by the transparency of natural polypropylene in the intermediate layer, it is preferable to provide a resin layer containing pearl essence separately to the intermediate polypropylene layer to form the intermediate layer.

(Outer Layer) The outer layer of the blow-molded container of the present invention comprises low-density polyethylene or high-density polyethylene and block polypropylene. The mixing ratio of low-density polyethylene or high-density polyethylene and block polypropylene is 9 It is desirable to use it in a ratio of 1 to 1: 9, preferably 5: 5 to 2: 8. If necessary, pearl essence may be added to the outer layer. In this case, the amount of pearl essence is preferably 0.1 to 1% by weight based on the total weight of the outer layer.

(Inner Layer) As the inner layer of the blow-molded container of the present invention, polypropylene is used as a main component, and a colorant is mixed therein. The colorant content is 1 for the entire inner layer.
It is preferably from 0.1 to 15% by weight, particularly preferably from 5 to 10% by weight. Further, as the inner layer resin, the scrap resin generated at the time of making the parison of the container of the present invention is contained in 70% of the entire inner layer.
It can be compounded in the range of not more than wt%. When the amount of scrap resin is more than the above range, the excellent properties of virgin polypropylene may be impaired. Further, pearl essence can be blended also in the inner layer, and in addition to being blended directly with the inner layer resin, a layer containing pearl essence may be separately provided outside the colored layer. The pearl essence is preferably in the range of 0.1 to 1% by weight based on the total weight of the inner layer so as not only to give pearl luster but also to prevent coloring. When a scrap resin or pearl essence is mixed with the inner layer resin, a natural polypropylene layer may be provided as the innermost layer.

The colorant that can be blended with the resin for the inner layer is not limited thereto, but the following pigments can be exemplified. White pigment Titanium white (titanium dioxide) Black pigment Carbon black, lamp flap, bone black Yellow pigment Hansa yellow, naphthol yellow, titanium yellow, benzidine yellow, permanent yellow orange pigment Permanent orange, vulcan orange, benzidine orange, indanthrene brilliant orange Red pigment Resole red, Brilliant carmine, Permanent red Purple pigment Manganese purple, First violet, Methyl violet lake, Quinacridone violet Blue pigment Ultramarine blue, Navy blue, Phthalocyanine blue, First sky blue Green pigment Malachite freen lake, Phthalocyanine green,
Naphthol Green These pigments can be used alone or in combination of two or more kinds, and further in combination with extender pigments such as calcium carbonate, barium sulfate, calcium sulfate, magnesium carbonate, clay, silica, talc and alumina white. However, it can be used.

(Intermediate Layer) In the present invention, by providing the intermediate layer as described above, it is possible to further add depth to the hue. The intermediate layer preferably has a layer made of natural polypropylene. Therefore, when the intermediate layer is made of natural polypropylene alone, or as described later, a layer of polypropylene containing pearl essence is laminated to form an intermediate layer. Are preferably formed. In particular, a structure in which a layer having pearl essence is sandwiched between natural polypropylene layers can be preferably used. When a layer containing pearl essence is laminated with a layer of natural polypropylene to form an intermediate layer, the layer containing pearl essence is in a ratio of 0.1 to 1.5 with respect to the layer of polypropylene alone. It is preferable to make it thick. The amount of pearl essence compounded is 0.1% of the total resin that will be the intermediate layer.
It is preferably in the range of 1 to 1%.

(Layer Structure) The container of the present invention is essentially composed of the outer layer and the inner layer, and an intermediate layer may be added thereto if desired. The layer structure is
Outer layer: inner layer = 1: if it consists of outer and inner layers only.
It is preferable that the layers are stacked at a ratio of 20 to 20: 1. When it is composed of an outer layer, an inner layer and an intermediate layer, outer layer: intermediate layer: inner layer = 1: 18: 1 to 1: 3:
It is preferable that 16 layers are stacked.

Hereinafter, an example of a laminated structure applicable to the container of the present invention will be shown, but of course it is not limited to this as long as it has the above-mentioned basic structure. Here, (outer) is an outer layer, (middle) is an intermediate layer, (inner) is an inner layer, PP is polypropylene, HDPE is high-density polyethylene, and LD.
PE is low density polyethylene, B.I. PP is block polypropylene, PE is pearl essence, PIG is a colorant,
RP means scrap resin respectively. (Outside) HDPE or LDPE + B.PP [+ PE] (Inside) PP + PIG (Outside) HDPE or LDPE + B.PP [+ PE] (Inside) PP + PIG / PP
＋ RP (Outside) HDPE or LDPE ＋ B.PP [＋ PE] (Inside) PP ＋ RP ＋ PI
G (outside) HDPE or LDPE + B.PP [+ PE] (inside) PP (inside) PP
＋ PIG (Outside) HDPE or LDPE ＋ B.PP [＋ PE] (Medium) PP / PE
(Inside) PP + PIG (Outside) HDPE or LDPE + B.PP [+ PE] (Medium) PP / PP + PE / P
P (inside) PP + PIG (outside) HDPE or LDPE + B.PP (inside) PP / PP + PE / PP (inside)
PP + PIG + PE (outside) HDPE or LDPE + B.PP (inside) PP / PP + PE (inside) PP +
PIG (outside) HDPE or LDPE + B.PP + PE (inside) PP (inside) PP + RP
＋ PIG (Outside) HDPE or LDPE ＋ B.PP ＋ PE (Medium) PP (Inside) PP ＋ RP
＋ PIG

(Molding of Container) An example of the colored multilayer blow-molded container of the present invention is shown in FIG.
Has a laminated structure of an outer layer 6, an inner layer 7 and an optional intermediate layer 8 in all parts of the container body such as the body portion 2, the bottom portion 3, the shoulder portion 4 and the neck portion 5. The container of the present invention is obtained by molding a parison composed of the above-mentioned laminate by extrusion molding or the like, and blow-molding this parison in a blow mold. Therefore, it is necessary to perform blow molding in a mold having a finely uneven surface.
As a mold used for molding the container of the present invention, a mold having fine irregularities formed by spraying glass beads having a particle size of about 250 to 500 μm on the mold surface is preferably used. The surface of the molded blow-molded container preferably has a gloss (according to JIS K 7105, incident angle 60 °) of 20% or less, particularly 7% or less, in order to give a sufficient matt feeling. The wall thickness is preferably 0.8 to 1.5 mm, especially 1 to 1.2 mm.

[0017]

【Example】

<Example 1> A parison made of a laminate having the following layer structure was blown to mold a container. Outer layer: High density polyethylene (MFR 0.5g / 10
Min) 20 wt%: block polypropylene (ethylene content 5 wt%, MFR 2.1 g / 10 min ethylene-propylene block copolymer) 80 wt% Inner layer: random polypropylene (MFR 1.1 g / 1
0 minutes) 90% by weight: pigment (phthalocyanine blue) 10
Weight% Outer layer to inner layer thickness ratio is outer layer: inner layer = 15: 85 Instrument wall thickness: 1.2 mm 60 ° Gloss value: 6% The resulting container has a pale deep blue color tone as a whole. It was a calm feeling.

Example 2 A parison made of a laminate having the following layer constitution was blown to mold a container. Outermost layer: High density polyethylene (MFR 0.3g / 10
Min) 20% by weight: block polypropylene (ethylene content 5% by weight, ethylene / propylene block copolymer with MFR 2.5 g / 10 min) 80% by weight Second layer: random polypropylene (MFR 1.1 g / 1
0 minutes) Third layer: Random polypropylene (same as the second layer) 9
9.6% by weight: high density polyethylene (same as outermost layer)
0.4% by weight Innermost layer: Random polypropylene (same as the second layer) 91
% By weight: pigment (permanent orange) 9% by weight The thickness ratio of each layer is as follows: outermost layer: second layer: third layer: innermost layer =
5: 70: 5: 20 Wall thickness: 1.2 mm 60 ° Gloss value: 6% The obtained container had a light skin color with deep depth and a high-class feeling.

Example 3 A parison made of a laminate having the following layer constitution was blown to mold a container. Outermost layer: High density polyethylene (MFR 0.8g / 10
Min) 20% by weight: block polypropylene (ethylene content 5% by weight, MFR 1.5 g / 10 min ethylene-propylene block copolymer) 80% by weight Intermediate layer: random polypropylene (MFR 0.9 g / 1
0 min) Innermost layer: Random polypropylene (same as middle layer) 9
1.6% by weight: pigment (manganese purple) 9% by weight: high density polyethylene (same as the outermost layer) 0.4% by weight The thickness ratio of each layer is as follows: outermost layer: middle layer: innermost layer = 5:75:
20 Wall thickness: 1.2 mm 60 ° Gloss value: 6% The obtained container had a deep, pale violet color and a high-class feeling as a whole.

[0020]

According to the present invention, in a colored container, the outer layer has a laminated structure of low density polyethylene or high density polyethylene, and block polypropylene, and the inner layer comprises colorant-containing polypropylene, and the outer layer surface is roughened. As a result, it is possible to provide a colored container having a deep color tone and a matte feel, and a high-grade feeling.
Moreover, by providing an intermediate layer made of polypropylene between the outer layer and the inner layer, it is possible to further increase the depth of color, and if at least one of these layers contains pearl essence, it becomes like a pearl. It is possible to impart a high gloss and further enhance the high-class feeling. Therefore, the container of the present invention can be preferably used for contents such as cosmetics, which require a particularly high-grade feeling.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a colored multilayer blow-molded container of the present invention.

[Explanation of sign]

 1 container body 6 outer layer 7 inner layer 8 middle layer

Claims (4)

[Claims] 1. An outer layer comprising low density polyethylene or high density polyethylene, and block polypropylene,
A colored multi-layer blow-molded container comprising a laminate having an inner layer made of polypropylene containing a colorant, and having a roughened outer layer surface. 2. The blow molded container according to claim 1, wherein the laminate further has an intermediate layer made of polypropylene. 3. The blow-molded container according to claim 2, wherein at least one of the outer layer, the inner layer and the intermediate layer contains pearl essence. 4. The blow-molded container according to claim 1, wherein the inner layer of the laminate contains scrap resin.