JPS6169559A - Multilayer tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multilayer tube with excellent fragrance retention. More specifically, it relates to a multilayer tube in which the innermost layer is made of polyester with excellent aroma retention and low-temperature heat-sealing properties, and a polyolefin layer with water vapor barrier properties is provided on the outside of the inner layer.

Specific uses of the present invention include cosmetics,
This is a tube container filled with food, toothpaste, industrial supplies, etc. In particular, in the above contents, the container has fragrance retention, r
This provides an optimal multilayer tube when R element traceability and moisture resistance are required.

[Conventional technology]

The tube containers are filled with cosmetics, foods, toothpaste, industrial supplies, etc. These contents give the container fragrance retention,
Most of them require oxygen barrier and moisture proof properties, and conventionally, 2-laminate tubes, which are made of 2-laminate sheets laminated with paper or thermoplastic resin on aluminum foil, are used.
A multilayer tube obtained by multilayer blow molding using a saponified ethylene-vinyl acetate monomer as a resin having barrier properties is used.

Furthermore, although some tubes are made of a single metal, the use of tubes mainly made of plastic is increasing due to reasons such as ease of extrusion of the contents and appearance.

[Problem that the invention seeks to solve]

Conventionally, polyolefin has been mainly used as the innermost layer of both laminate tubes and multilayered tubes. This is used for joining when making the body of a laminate tube into a cylindrical shape.
Edge sealing: The edge sealing of multilayer tubes is done by heat sealing, where the polyolefin is fused at low temperatures.
Moreover, it is strong. However, polyolefin has the property of easily adsorbing fragrance ingredients, and it adsorbs fragrances contained in toothpaste, cosmetics, etc.
The disadvantage is that it leads to a decrease in flavor level.

[Means for solving problems]

As a result of various studies to solve the above-mentioned drawbacks, the inventor of the present invention has found that a significant improvement can be made by using polyester, which is difficult to adsorb fragrances and has low-temperature heat-sealing properties, as the innermost layer to be heat-sealed. I found it. That is, the multilayer tube of the present invention is made of a polyester whose innermost layer contains 4),4-cyclohexanedimethanol as a glycol component and has low-temperature heat-sealing properties and fragrance retention properties with a Vikato softening point of 90°C or less. Yes, and at least one polyolefin layer outside the layer! This is a #sign.

Here, the above-mentioned polyolefin layer imparts moisture resistance, and in order to increase the moisture resistance, it is effective to provide a saponified ethylene-vinyl acetate copolymer layer. Furthermore, the above-mentioned dicyclohexanedimethanol improves the heat-sealability, and by using one with a Vicat softening point of 90° C. or less, low-temperature heat-sealing performance can be provided.

[Effect]

The above-mentioned present invention will be explained in more detail below using the drawings.

FIG. 7 is a cross-sectional view of an embodiment of the multilayer tube of the present invention during the manufacturing process. This consists of a bottle-shaped adhesive layer obtained by blow molding. The multilayered tape of the present invention shown in FIG. 1 is obtained by cutting this along dashed lines and heat sealing the edges. The edges may be fused by high-frequency sealing ultrasonic sole instead of heat-on-rubber. This is an inventive multilayer tube.

As mentioned above, the polyester in the present invention is one that contains tercyclohexane dimetatool as a glycol component and has a Vicat softening point of 9Q°C or lower. The Vikato softening point referred to herein is measured by ASTM D-/J-COJ, and it is not possible to have appropriate low-temperature heat-sealing properties at temperatures above qo°C. As such polyester, K manufactured by Eastman Chemical Co.
odar (5PET G Ari 63 is available.

Polyolefins include polyethylene, polypropylene, linear low-density polyethylene, ethylene and vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, maleic anhydride, and polyethylene with a density of about 0 to 096. It is a thermoplastic resin mainly composed of olefin monomers such as copolymers with monomers such as ionomers and ionomers.

The saponified ethylene-vinyl acetate copolymer preferably has an ethylene content of 20 to 40 mol% and a saponification degree of 95% or more.

Furthermore, adhesion is achieved by providing a suitable adhesive resin layer between these polyester, polyolefin, and saponified ethylene-vinyl acetate copolymer layers. For this purpose, one or a mixture of two or more of the above-mentioned polyolefins, polyolefins obtained by graft polymerization of unsaturated monomers having a carbonyl group such as maleic anhydride, tackifiers, and low molecular weight polyesters are used. Of course, the material is not limited to these, and any material may be used as long as it provides adhesive strength that does not cause any practical problems.

The multilayer tube of the present invention uses polyester for the inner layer that does not easily absorb fragrance, and is useful for toothpastes and cosmetics containing fragrance as contents.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

Example/ As the innermost layer, Kod from Eastman Chemical Co., USA
ar (J3JPET G A 7 A J, E-J00H made by Mitsubishi Yuka Co., Ltd., which is a modified ethylene-vinyl acetate copolymer, was used as the adhesive layer, and low-density polyethylene with a density of A9 was used as the outermost polyolefin layer. Total thickness with ratio ////I (14' jfl, content ijk/
A tube of Oml was obtained.

(Example) Eval ■F manufactured by Kuraray, which is a saponified ethylene-vinyl acetate copolymer, was provided between the polyester layer and the low-density polyethylene layer of Example /, and both sides of the layer were E-JOOH. Total thickness 0g js where is l/////// A
+yr, a tube containing 1 coornt was obtained.

Comparative Example 1 With a layer configuration of low-density polyethylene/adhesive layer/saponified ethylene-vinyl acetate copolymer N/adhesion 1@/low-density polyethylene and a layer ratio of J///////J, the total thickness o
A tube with 4Ir head and content value/Ov was obtained.

JO the same commercially available cosmetic cream with reduced fragrance in each tube.
Filled with ml light. The results are shown in Table-/.

Table/゛l) The amount of fragrance after time was compared by gas chromatography, setting the value before filling as 900.

〔Effect of the invention〕

By using the multilayer tube of the present invention, the polyester in the innermost layer does not easily adsorb fragrances, so it is possible to create an innovative tube container that has excellent fragrance retention, and also has low-temperature sealing properties, oxygen barrier properties, moisture resistance, etc. can be formed.

The contents can be filled with cosmetics, foods, toothpaste, industrial supplies, etc. The tube has particularly high fragrance retention, so it is ideal for contents containing fragrances.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the multilayer tube of the present invention during manufacture, and FIGS. L: Polyester layer adhesive Layer 3: Polyolefin, FiI Patent requested K Inu Japan 61 products, 1 formula ゛Public agent friend Patent attorney small fiC Shu Shuang! = Polyester layer 2 = Adhesive layer 3 - Polyolefin layer 4 = Cutting position Keni L Bamboo view Figure 1 Figure 2 Figure 3

Claims (7)

[Claims] (1) The innermost layer contains 1,4-cyclohexanedimethanol as a glycol component, and the Vikato softening point is 90°C
A multilayer tube made of the following polyester and having at least one adhesive layer and one polyolefin layer in order outside the polyester layer. (2) The adhesive layer is one or a mixture of two or more of polyolefin, polyolefin graft-polymerized with an unsaturated monomer having a carbonyl group such as maleic anhydride, a tackifier, and a low molecular weight polyester. A multilayer tube according to claim (1), characterized in that: (3) Polyethylene, polypropylene, linear low-density polyethylene, ethylene and vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, anhydrous The multilayer tube according to claim (1), which is a thermoplastic resin mainly composed of an olefin monomer such as a copolymer with a monomer such as maleic acid or an ionomer. (4) The innermost layer contains 1,4-cyclohexanedimethanol as a glycol component and has a Vikato softening point of 90°C
A multilayer tube made of the following polyester and having an adhesive layer, a saponified ethylene-vinyl acetate copolymer layer, an adhesive layer, and a polyolefin layer in order outside the polyester layer. (5) The adhesive layer is one or a mixture of two or more of polyolefin, polyolefin graft-polymerized with an unsaturated monomer having a carbonyl group such as maleic anhydride, a tackifier, and a low molecular weight polyester. A multilayer tube according to claim (4), characterized in that: (6) The saponified ethylene-vinyl acetate copolymer layer has an ethylene content of 20 to 60 mol% and a degree of saponification of 95% or more (hereinafter referred to as the saponified ethylene-vinyl acetate copolymer layer). Claims characterized in that (4)
) Multilayer tube as described in ). (7) Polyethylene, polypropylene, linear low-density polyethylene, ethylene and vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, anhydrous The multilayer tube according to claim (4), which is a thermoplastic resin mainly composed of an olefin monomer such as a copolymer with a monomer such as maleic acid or an ionomer.