JP2523770Y2 - Laminated tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated tube using a thermoplastic elastomer resin for a shoulder, and more particularly, to a laminated tube with improved squeezability of residual contents.

[Related Art] Laminated tubes have been widely used as containers for accommodating dentifrices, cosmetics, foods and drinks, medicines, and the like.
As shown in FIG. 4, the laminating tube is composed of a cylindrical body 3, a frusto-conical shoulder 2, a mouth and neck 1, and a butt 4 which is continuous with the body 3 and is closed. Become.

The shoulder 2 and the mouth and neck 1 are integrally formed of a thicker hard resin, and the shoulder 2 has a thickness of about 1400 μm.
For this reason, the shoulder 2 and its periphery cannot be crushed by hand, and the toothpaste is often left over with the toothpaste remaining on the shoulder 2 and its periphery, which is uneconomical. Was. On the other hand, the thickness of the hard resin at the shoulder portion was reduced to 500 to 600 μm, but the shoulder portion could not be completely crushed. In some cases, the shoulder 2 of the container is cut off and the toothpaste or the like is used.
It was very labor intensive and a problem.

As an attempt to improve the squeezing property,
No. 2832 discloses that an opening 12 is provided at an end side of a cylindrical material made of plastic as a main base material as shown in FIGS. 5 and 6, and an edge member 13 is provided at the opening. Including a cylindrical main body 11 sealed and attached, and a cap 14 screwed into an opening end of the rim member 13, and a peripheral surface of an upper edge portion and a lower edge portion of the cylindrical main body portion 11 or the same. A tube-shaped container in which the vicinity is sealed is disclosed.

In FIGS. 5 and 6, reference numeral 15 denotes a shoulder member, and reference numeral 16 denotes a plate-shaped seal.

Japanese Patent Publication No. Sho 60-20261 discloses that, as shown in FIG. 7, an upper end of a cylindrical body 21 is formed in a slope, and a shoulder 23 is outwardly formed from a lower end of a mouth and neck 22. Disclosed is a synthetic resin tube container which is attached by inclining a shoulder member 24 protruding to the same direction as the upper end of the body portion 21 and joining a peripheral edge of the shoulder portion 23 to an upper end edge of the body portion 23. doing.

Each of these exhibits excellent squeezability.

[Problems to be solved by the invention] However, the above-mentioned Japanese Utility Model Publication No. 57-42832 and Japanese Patent Publication No. 60-202
In the extruded tube container disclosed in Japanese Patent Publication No. 61, there is a problem that the manufacturing apparatus and the manufacturing process are complicated and expensive because the vicinity of the mouth and neck is not symmetrical.

The purpose of the present invention is to solve the above-mentioned problem. The purpose is to squeeze the shoulder and its surroundings by hand, and the squeezing property of the residual contents is good. Provided is a laminate tube which is excellent in resilience of the form without cracks in the portion, has good symmetry of the shape near the mouth and neck, and can be manufactured by slightly modifying the conventional manufacturing apparatus and manufacturing process. It is in.

Means for Solving the Problems The present invention provides a threaded mouth and neck, a frustoconical shoulder continuous with the mouth and neck, and a tube container body continuous with the lower end of the shoulder. And a butted portion continuous with the body and a closed buttocks, wherein the mouth and neck are formed of polyethylene, and the shoulder which is continuous with the mouth and neck comprises (A) a thermoplastic elastomer resin; ) A laminate of a thermoplastic elastomer resin and a thin-walled polyethylene, (C) or a laminate of a thermoplastic elastomer resin and a barrier material (however, in the above (A) to (C), unvulcanized EPM is thermoplastic) (Excluded from the elastomer resin).

[Operation] Since the threaded mouth and neck 1 is made of polyethylene, even if the cap is tightened with a large fastening force, the thread of the mouth and neck 1 may be deformed or the cap may come off. Therefore, the cap can be securely tightened.

In addition, the shoulder 2 continuous with the mouth and neck 1 is formed of a thermoplastic elastomer resin, a laminate of the thermoplastic elastomer resin and thin-walled polyethylene, or a laminate of the thermoplastic elastomer and the barrier material. In addition, the shoulder is soft, and the shoulder and its surroundings can be crushed by hand, so that the residual contents can be easily squeezed out. Is excellent.

Furthermore, by making the material of the shoulder portion 2 a specific material, the squeezability is improved, and it is not necessary to make the shape inferior in symmetry, and squeezability can be ensured even in a shape with good symmetry. Therefore, the manufacturing can be performed by slightly modifying the conventional manufacturing apparatus and manufacturing process without complicating the manufacturing device and the manufacturing process.

[Embodiment] Next, the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 is a front view of a laminated tube according to an embodiment of the present invention with a broken portion showing the configuration of the embodiment, and FIGS. 2 and 3 are broken portions showing another embodiment of the laminated tube of the present invention. It is a principal part front view accompanied with.

The laminated tube shown in FIGS. 1 to 3 has a threaded mouth and neck 1, a conical shoulder 2 continuous with the mouth and neck 1, and a continuous lower end of the shoulder 2. Tube container body 3 and buttocks 8 continuous and closed to body 3
(Not shown in FIGS. 2 and 3).

The mouth and neck 1 in FIGS. 1 to 3 is formed of polyethylene 7.

In the laminate tube shown in FIG. 1, a shoulder 2 continuous with the mouth and neck 1 is formed by injection of a thermoplastic elastomer resin 4 to a thickness of 800 to 1200 μm.

In the laminate tube shown in FIG. 2, a shoulder 2 connected to the mouth and neck 1 is formed by laminating a thermoplastic elastomer resin 4 and a thin polyethylene 5 connected to the mouth and neck 1. The thickness of the thin polyethylene is preferably 200 to 300 μm, and the thickness of the thermoplastic elastomer resin 4 is preferably 800 to 1000 μm.

In the laminate tube of FIG. 3, the shoulder 2 continuous with the mouth and neck 1 is formed of a laminate of a thermoplastic elastomer resin 4 and a barrier material 6 of 800 to 1200 μm. As the barrier material, a laminated film containing aluminum foil, a barrier resin film, or the like is used.
The barrier material used for the shoulder of the laminate tube compensates for the lack of barrier properties of the shoulder part, and is generally called Rondel.

In the laminated tube container shown in FIGS. 1 to 3, since the threaded neck portion 1 is formed of polyethylene 7, the thread of the neck portion 1 is deformed even when the cap is fitted and tightened with a large fastening force. The cap can be securely tightened without the cap or the cap coming off.

Further, since the shoulder portion 2 continuous with the mouth and neck portion 1 is formed of a thermoplastic elastomer resin, a laminate of a thermoplastic elastomer resin and a thin-walled polyethylene, or a laminate of a thermoplastic elastomer resin and a barrier material. In addition, the contents of the container can be squeezed by crushing from the base of the mouth and neck to near the upper end of the buttocks including the shoulder.

In addition, no crack is generated in the crushed portion, and the container is quickly restored to the shape before crushing.

Furthermore, since the squeezability is improved by appropriately selecting the material of the shoulder portion 2, the shape can be made a shape with good symmetry as in the conventional case, and the conventional manufacturing apparatus and manufacturing process are slightly reduced. It can be manufactured simply by reworking.

In the present invention, the thermoplastic elastomer resin can be molded by heating and pressurizing, and includes a variety of thermoplastic elastomer resins which maintain a constant shape during molding and have rubber elasticity at room temperature. However, unvulcanized EPM is excluded.

Examples of thermoplastic elastomer resins include ionomer resins, ethylene-vinyl acetate copolymers, styrene-butadiene block copolymer elastomers, and styrene-butadiene block copolymer hydrogenated elastomers. JP-A-62-263241 (I) (A) 20 to 80% by weight of a propylene-based resin (B) 82 to 98.7% by mole of an ethylene constituent unit 1 to 15% by mole of an ester constituent unit selected from an alkyl acrylate and an alkyl methacrylate 5 to 38% by weight of an ethylene copolymer having 0.3 to 3% by mole of an unsaturated carboxylic anhydride constituent unit and (C) 50 to 85% by mole of an ethylene constituent unit, Mooney viscosity (ML _{1 + 4 at} 100 ° C.) 20-100, ethylene with an iodine value of 20 or less
A thermoplastic elastomer composition comprising 5-70% by weight of propylene and / or ethylene-propylene-non-conjugated diene copolymer rubber.

(II) A thermoplastic elastomer composition obtained by partially cross-linking a mixture of an ethylene copolymer rubber (A) comprising ethylene and an acrylate or methacrylate and an olefin copolymer (B).

And the like.

 The above composition will be described in more detail.

First, the composition (I) will be described. As the polypropylene resin, crystalline polypropylene, crystalline polypropylene / ethylene block or random copolymer, crystalline propylene / α-olefin copolymer (however, α-olefin having 4 to 10 carbon atoms) and the like are used alone. Or in the form of a mixture of two or more.

The polypropylene resin has a melt index (according to JIS K6758) of usually 0.5 to 100, preferably 1 to 50.

Examples of the monomer having an ester constituent unit included in the ethylene copolymer include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, and butyl methacrylate.

Examples of the monomer having an unsaturated dicarboxylic anhydride structural unit include, for example, maleic anhydride, citraconic anhydride, itaconic anhydride, tetrahydrotaphthalic anhydride, and the like. Most preferably, it is used.

In producing the thermoplastic elastomer composition (I), a styrene-butadiene random copolymer and a styrene- Various styrene-based elastomers such as butadiene block copolymers and hydrogenated products thereof, and non-crystalline ethylene-propylene copolymers, various polyolefin-based elastomers such as ethylene-propylene-dicyclopentadiene copolymer, and further, anhydrous Various functional group-containing polyolefins such as maleic acid graft-modified propylene and glycidyl group-containing ethylene copolymer may be additionally mixed.

If necessary, a process oil, that is, a paraffin-based oil, an aromatic-based oil, a naphthenic-based oil, or the like may be added and mixed for the purpose of softening, increasing the amount of rubber, and improving processability.

It is also possible to add appropriate amounts of various additives such as antioxidants, weathering agents, antistatic agents, foaming agents and adhesives.

 Next, the composition (II) will be described.

As the acrylate or methacrylate in the ethylene copolymer rubber (A) of the composition (II), the same acrylates or methacrylates as those described in the composition (I) can be used.

The ethylene-based copolymer rubber (A) in the composition (II) may be an unsaturated glycidyl ester, an acid anhydride, an unsaturated compound having a carboxylic acid group, etc. (hereinafter referred to as “third component”).
) Can be copolymerized.

As unsaturated glycidyl esters, for example,
Glycidyl acrylates described in 46-45085, glycidyl methacrylate, itaconic acid diglycidyl ester, butenetricarboxylic acid triglycidyl ester, p-styrene carboxylic acid glycidyl ester and the like are exemplified as unsaturated compounds having a carboxylic acid group. Examples thereof include acrylic acid, methacrylic acid, maleic acid and a half ester compound of maleic acid, and examples of the acid anhydride include maleic anhydride. The amount of the third component used is 0.05 to 5 mol%, preferably 0.1 to 3 mol%, based on the total of both components (A) and (B).

It is also possible to copolymerize the ethylene copolymer rubber (A) with a copolymer copolymerizable with other ethylene. Specific examples include isobutylene, styrene and derivatives thereof, vinyl acetate, and halogenated olefins such as tetrafluoroethylene and hexafluoropropylene.

Next, the olefin copolymer (B) used in the composition (II) is a copolymer of polypropylene or propylene and an α-olefin having 2 or more carbon atoms. Specific examples of the α-olefin having 2 or more carbon atoms include ethylene, 1-butene, 1-pentene, 8-methyl-
There are 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.

The olefin copolymer rubber (C) used in the composition (II) includes, for example, ethylene-propylene copolymer rubber, ethylene-propylene-nonconjugated diene rubber, ethylene-butene-nonconjugated rubber. It is an amorphous random elastic copolymer containing an olefin as a main component, such as a diene rubber or a propylene-butadiene copolymer rubber. Among these, an ethylene-propylene-non-conjugated diene rubber is particularly preferred. Examples of the non-conjugated diene include dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene, and ethylidene norbornene, with ethylidene norbornene being particularly preferred.

As a more specific example, the propylene content is 10 to 55
Ethylene-propylene-ethylidene norbornene copolymer rubber (hereinafter referred to as "EPDM") having an ethylene-propylene-ethylidene norbornene content of 1 to 30% by weight, preferably 3 to 20% by weight, preferably 20 to 40% by weight. Yes and at 100 ° C
Mooney viscosity (ML _{1 + 4} 100 ° C) is 50-350, preferably 1
50-300.

As the organic peroxide for partially crosslinking the mixture of (A) and (B) or the mixture of (A), (B) and (C), 2,5-dimethyl-2,5-di (t -Butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-di ( t-butylperoxy) 3,5,5-trimethylcyclohexane, 2,5
-Dimethyl-2,5-di (peroxybenzoyl) hexyne-8, dicumyl peroxide and the like. Of these, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane is particularly preferred in terms of odor and scorch.

The amount of the organic peroxide to be added can be selected in the range of 0.03 to 2.0 parts by weight based on 100 parts by weight of the above (A) and (B) or (A), (B) and (C). . If the amount is less than 0.03 parts by weight, the effect of the crosslinking reaction is small, and if it exceeds 2.0 parts by weight, control of the reaction is difficult, and it is not economically advantageous.

When producing the composition of the above (II), N, N'-m-phenylenebismaleimide, toluylenebismaleimide, p
-Peroxide crosslinking aids such as quinone dioxime, nitrobenzene, diphenylguanidine, and trimethylolpropane; or polyfunctional vinyls such as divinylbenzene, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and allyl methacrylate. Monomers can be blended. By compounding such a compound,
A uniform and gentle crosslinking reaction, and (A) and (B),
Alternatively, a reaction occurs between (A), (B), and (C), so that mechanical properties can be improved.

The amount of the peroxide crosslinking aid or the amount of the polyfunctional vinyl monomer to be added may be the above (A) and (B), or (A), (B)
The amount can be selected in the range of 0.01 to 4.0 parts by weight based on 100 parts by weight in total of (C) and (C). Preferably it is 0.05 to 2.0 parts by weight. When the amount is 0.01 part by weight, the effect is hardly exhibited, and when it exceeds 4 parts by weight, it is not economically advantageous.

[Effects of the Invention] The effects of the invention are as follows.

(1) The shoulder and the periphery thereof can be crushed by hand, so that the remaining contents can be squeezed out easily. Cracks do not occur in the crushed portion and the shape can be easily restored.

(2) The shape of the vicinity of the mouth and neck is good symmetry, the manufacturing apparatus and the process are not complicated, and the manufacturing can be performed by slightly modifying the conventional manufacturing apparatus and manufacturing process.

(3) Even when the cap is tightened with a large fastening force, the screw thread at the mouth and neck does not deform or the cap comes off, and the cap can be securely tightened.

[Brief description of the drawings]

FIG. 1 is a front view with a broken portion showing one embodiment of the laminate tube of the present invention, FIG. 2 and FIG. 3 are front views of main parts with a broken portion showing other embodiments, respectively. FIG. 5 is a front view showing a conventional extruded tube with poor squeezability, with a break, FIG. 5 is a perspective view showing a conventional extruded tube with improved squeezability, FIG. 6 is a cross-sectional view of a main part thereof, and FIG. It is a front view with a break part which shows the conventional extrusion tube which improved the property. DESCRIPTION OF SYMBOLS 1 ... Mouth and neck part, 2 ... Shoulder part, 3 ... Body part, 4 ... Thermoplastic elastomer resin, 5 ... Thin polyethylene, 6 ...
... barrier material, 7 ... polyethylene, 8 ... buttocks, 11
…… the cylindrical main part, 12 …… the opening, 13 …… the rim member, 14…
... Cap, 15 ... Shoulder member, 16 ... Plate seal, 17 ...
Butt, 21 ... Torso, 22 ... Mouth and neck, 23 ... Shoulder

Claims (4)

(57) [Scope of request for utility model registration] 1. A threaded mouth and neck, a truncated cone-shaped shoulder continuous with the mouth and neck, a tube container body continuous with a lower end of the shoulder, and a body closed continuously with the body. In the laminated tube having a set butt portion, the mouth and neck are formed of polyethylene, and the shoulder continuous with the mouth and neck is (A) a thermoplastic elastomer resin, (B) a thermoplastic elastomer resin and a thin polyethylene. With a laminate,
(C) or a laminate of a thermoplastic elastomer resin and a barrier material (however, in the above (A), (B) and (C), the unvulcanized EPM is excluded from the thermoplastic elastomer resin). A laminated tube, characterized in that: 2. The laminated tube according to claim 1, wherein the thermoplastic elastomer resin is an ionomer resin, a butadiene-styrene block copolymer elastomer, EPDM, or an ethylene-vinyl acetate copolymer. 3. A thermoplastic elastomer resin comprising: (A) a polypropylene resin; (B) an ethylene copolymer having an ethylene structural unit, an ester structural unit and an unsaturated carboxylic anhydride structural unit; 2. The laminate tube according to claim 1, which is a thermoplastic elastomer composition comprising (a) ethylene-propylene and / or an ethylene-propylene-nonconjugated diene copolymer rubber. 4. A thermoplastic elastomer resin obtained by partially cross-linking a mixture of an ethylene copolymer rubber (A) comprising ethylene and an acrylate or methacrylate and an olefin polymer (B). The laminated tube according to claim 1, which is a plastic elastomer composition.