JP2002114260A - Unsymmetrical liner with high gas cutoff properties and closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liner and a closure, which is a plastic liner capable of reducing a gas permeability rate between a container and the external environment as compared with a liner in the prior art, which has a gas barrier layer capable of holding its gas barrier properties under the high-humidity condition, which is simple in structure and low in the production cost, and which has reliability in operation. SOLUTION: The closure for a container is provided with the unsymmetrical liner. This liner includes a first and a second layers, and the second layer is the nearest layer to the container. The liner includes a gas barrier layer, preferably a liquid crystal polymer, between the first layer and the second layer. In order to reduce gas leaking passages between the container and the external environment, the thickness of the second layer is made thinner than that of the first layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to liners suitable for use in container closures, and more particularly to closures with asymmetric gas barrier liners that reduce the rate of gas permeation of food or beverage containers.

[0002]

BACKGROUND OF THE INVENTION Plastic liners for closures have become widely used and are a commercially successful product in the food and beverage packaging industry. Plastic liners are generally a series of polymer layers, including an outer layer with good slip and torque properties to properly seal the container and remove the closure from the container, and a gas barrier layer to reduce gas permeation. is there. The liner is inserted inside the closure such that the liner contacts the container lip to reduce gas transmission into or out of the container. The reduced gas transmission extends the life of the food or beverage in the container.

However, the problem with prior art liners is that they do not adequately delay the permeation of gas, causing loss of carbon dioxide (from soft drinks) and / or oxygen ingress into the container, resulting in poor food quality. That is. For example, a typical barrier liner uses an ethylene-vinyl alcohol copolymer (EVOH) as the gas barrier layer. However, EVOH is moisture sensitive and loses its gas barrier properties upon prolonged exposure to moisture. To eliminate this problem, closures containing an EVOH liner separated the EVOH layer from the side facing the container and / or added a moisture barrier to protect the EVOH gas barrier. The problem with adding a vapor barrier is that it adds complexity and closure cost. Separating the EVOH layer from the contents of the container enlarges the gas leakage path (shown in FIG. 1), resulting in an increased gas permeation rate.

FIG. 1 is a cross-sectional view of a prior art closure showing a screw thread 103 mounted on a container 105.
And a closure 101 with a liner 102. The container 105 contains contents 106 (for example, carbonated beverage).
Contains. The liner 102 includes a first outer layer 110, a gas barrier layer 114, and a second outer layer 112. The second outer layer 112 is the layer closest to the contents 106 of the container 105. The problem with the prior art closure 101 may be that there are leak paths (eg, leak paths 120 and 122) that allow gas to escape from the vessel 105 or allow oxygen to enter the vessel 105 from the outside environment 130.

[0005] Leakage channels 120 and 122 are for illustration only, but show how gas may permeate between container 105 and outer environment 130.
For example, for cost reasons, the closure 101 is generally made of a gas permeable material, such as polyethylene or polypropylene. These are generally 3-
Shows gas permeability four orders of magnitude higher. For example, the leak path 120
Shows the manner in which gas permeates from the container 105 through the permeable second outer layer 112 of the liner 102 and through the walls of the closure 101 to the outer environment 130.

[0006] Leakage channel 122 illustrates how gas may permeate through permeable second outer layer 112 and threads 103 to outer environment 130. Thus, even if the closure 101 is made of a high gas barrier material such as aluminum, gas can still escape through the threads of the closure 101.

[0007] Accordingly, the leakage paths 120 and 122 have a high gas permeation rate, and thus shorten the storage life of the contents 106 of the container 105.

[0008]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a plastic liner that reduces the rate of gas transmission between the container and the outside environment as compared to the prior art liners.

Another object of the present invention is to provide a gas barrier layer which can maintain its gas barrier properties under high humidity conditions and is suitable for use in plastic liners. It is another object of the present invention to provide a closure with a small gas leakage path to reduce the amount of gas permeation between the container and the outside environment.

It is yet another object of the present invention to provide a liner and closure that is simple, inexpensive to manufacture, and reliable in operation.

[0011]

SUMMARY OF THE INVENTION The object of the invention is achieved by providing an asymmetric liner suitable for use in a container closure. The liner includes a first layer and a second layer, the second layer being the layer closest to the container. The liner also includes a gas barrier between the first and second layers.
To reduce gas leakage between the container and the outside environment,
The thickness of the second layer is smaller than the thickness of the first layer.

In another aspect of the present invention, there is provided a closure for a container, the closure including a base wall and a peripheral skirt. The skirt is fixed to a base wall that defines the interior of the closure and is adjusted to connect to the container. A liner is located inside the interior of the closure. This liner has a first layer, a second layer,
And a gas barrier layer between the first and second layers, wherein the gas barrier layer is a liquid crystal polymer (LCP).

[0013] The present invention is directed to an asymmetric liner designed to reduce the rate of gas permeation between the contents of the container and the outside environment. Reducing the leakage path between the closure and the outside environment reduces the gas permeation rate. In the present invention, asymmetric means that the gas barrier layer is not located at an intermediate point of the liner.

The asymmetric liner includes a first layer and a second layer, the second layer being the layer closest to the container. The liner also includes a gas barrier between the first and second layers. The thickness of the second layer is less than the thickness of the first layer to reduce gas leakage between the container and the outside environment.

FIG. 2 is a cross-sectional view of one embodiment of the liner according to the present invention. The liner 202 includes a first outer layer 210, a second outer layer 212, and a first outer layer 210 and a second outer layer 212.
And a gas barrier layer 214 disposed therebetween. Second outer layer 2
12 is a layer closest to the container, and is thinner than the first outer layer 210.

Generally, the thickness of the entire liner 202 is about 50
0-about 2000 micrometers (μm). First
Outer layer 210 preferably has a thickness of about 375 to about 1250.
μm, more preferably about 625 to about 875 μm.
The thickness of the second outer layer 212 is generally less than about 250 μm, preferably less than about 150 μm, more preferably about 75 μm
Less than, more preferably about 25 to about 75 μm, or about 40 to about 60 μm.

The thickness of the gas barrier layer 214 is typically about 50
μm, preferably less than about 25 μm, more preferably about 2 to about 15 μm, and about 5 to about 10 μm. The exact thickness of the gas barrier layer 214 is a trade-off between permeation speed and cost. The thicker the gas barrier layer, the lower the gas permeation rate, but the higher the cost.

It should be further noted that multiple gas barrier layers can be used in the present invention. Multiple gas barrier layers can be located between the same materials used to create the outer layer, or can be located between other gas barrier layer materials.

The gas barrier layer is preferably made of a material that provides a barrier to gas permeation and is moisture insensitive because it is located in close proximity to the contents of the container. EVOH can be used as the gas barrier layer, but is not preferred in the present invention. EVOH is moisture sensitive and loses its gas barrier properties when exposed to moisture for extended periods of time.

Therefore, preferred materials for use in the gas barrier layer are those that are resistant to moisture degradation. The term “moisture decomposition resistance” means that the gas barrier properties are not substantially reduced by exposure to moisture. Examples of moisture resistant gas barrier layers include, but are not limited to, liquid crystal polymer (LCP) and polyvinylidene chloride. More preferably, the gas barrier layer is made of LCP, and even more preferably, it is made of fully aromatic LCP.

[0021] Liquid crystal polymers (LCP) are characterized by having a liquid crystal phase at temperatures higher than the temperature at which the polymer melts. They have good gas barrier properties and can withstand high humidity environments. The LCP used in the liners described herein is generally a polyester or poly (ester-
Amides) and generally comprises, in their structure, in addition to functional groups, monomeric units which contain one or more of the following aromatic nuclei:
1,4-phenylene, 1,3-phenylene, 4,4'-
Biphenylene, and 2,6- and / or 2,7
-Naphthylene. Certain LCPs also contain monomer units derived from ethylene glycol. LCPs that can be used in the present invention include VEC available from Ticna.
BP-Amo, a polymer sold under the trademark TRA
LCP available from co Chemicals and sold under the trademark XYDAR, and LCP available from DuPont and sold under the trademark ZENITE
Is included.

In general, L containing fully aromatic monomer units
CP comprises one or more of the following monomers, generally at least 2
Can be derived from one of the following monomers: terephthalic acid, isophthalic acid, 1,4-hydroquinone, resorcinol,
4-aminobenzoic acid, 3-aminobenzoic acid, 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 4-aminophenol, 3-aminophenol, 1,4-phenylenediamine, 4,4′-biphenol, 4, 4'-biphenyldicarboxylic acid, 6-hydroxy-2-naphthoic acid,
2,6-naphthalenedicarboxylic acid and 2,6-dihydroxynaphthalene.

Examples of other gas barrier layer materials that can be used in the present invention are blends of LCP with a thermoplastic, preferably a polyolefin or other gas barrier layer material. LC
Examples of polyolefins that can be blended with P include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate (EVA), ethylene-methyl acrylate, styrene-ethylene copolymer, EVO
H and the like, but are not limited thereto. Preferred polyolefins that can be blended with LCP are polyethylene, polypropylene, polyvinylidene chloride, EVA, E
VOH and mixtures thereof. Examples of gas barrier layer materials that can be blended with LCP are polyvinylidene chloride, EVO
H, polyethylene terephthalate, polyethylene naphthalate, cyclic olefin copolymers, polyamides such as MXD6 (copolyamide of meta-xylenediamine and adipic acid; Mitsubishi Gas Che
medical products), polyacrylonitrile, and mixtures thereof. The amount of LCP in the LCP blend may be from about 0.1 to about 99% by weight based on the total weight of the blend.

A compatibilizer is used.
Preferably, r) is used in the LCP blend. The role of the compatibilizer is to facilitate obtaining a more homogeneous dispersed blend, for example, by lowering the surface tension and / or improving the adhesion between the components. To obtain a homogeneous dispersion blend, any suitable compatibilizer, such as WO96 /
00752 and WO 93/24574, which are incorporated herein by reference, can be used. Preferred compatibilizers for use in the LCP blend are functionalized polyolefins, which include carboxyl groups and their esters, carboxylic anhydride groups, glycidyl groups, alkoxysilane groups and combinations thereof, It is not limited to these. The amount of the compatibilizer is about 0.5% based on the total weight of LCP and thermoplastic resin.
1-about 30% by weight.

The first outer layer 210 and the second outer layer 212 can be made from the same or different materials, such as thermoplastic elastomers, polyolefins and combinations thereof. Thermoplastic elastomers are polymers that have the processability of thermoplastic materials and the functionality and properties of thermoset rubber. Examples of thermoset elastomers include, but are not limited to, styrene block copolymers, elastomer alloys, thermoplastic polyurethanes, thermoplastic polyesters, and thermoplastic polyamides. Polyolefins can also be considered as thermoplastic elastomers. Thermoplastic elastomers are available from Modern Plastics Handb.
book, McGraw-Hill, 1988, p. 93
It is described below.

The polyolefin used in the first and second outer layers in the present invention may be a homopolymer or a copolymer containing more than one type of monomer repeating unit. Examples of polyolefins that can be used are polyethylene,
Examples include, but are not limited to, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate, ethylene-methyl acrylate, styrene-ethylene copolymer, and the like. Preferred polyolefins are polyethylene, polypropylene and ethylene-vinyl acetate.

FIG. 3 shows another embodiment of the liner of the present invention, in which an adhesive layer is provided between the first or second outer layer and the internal gas barrier layer. The liner 202 of FIG. 3 includes a first outer layer 210, a second outer layer 212, a gas barrier layer 214, and at least one adhesive layer 216 and / or disposed between the outer layer 210 and / or 212 and the gas barrier layer 214.
Or 218. The second outer layer 212 is the layer closest to the container and is thinner than the first outer layer 210. The same material as described above can be used for the outer layer 210, the second outer layer 212, and the gas barrier layer 214.

An adhesive is any material that can bond other materials together by surface attachment, such as by reactive bonding (covalent or dipole-dipole bonding) or non-reactive means (chain entanglement with the polymer). is there. Outer layers 210 and 212
Any suitable adhesive can be used to bond the gas barrier layer 214 with the gas barrier layer 214. When the gas barrier layer is LCP,
Preferably, the adhesive layer is a functionalized polyolefin.
Examples of suitable functional groups for the functionalized polyolefin include, but are not limited to, carboxyl groups and esters thereof, carboxylic anhydride groups, glycidyl groups, alkoxysilane groups, and combinations thereof. A preferred adhesive layer is
Terpolymer of ethylene, methyl acrylate and glycidyl methacrylate. Such LCP adhesives are disclosed in USP 6,015,524 and 6,013,37.
3 which are incorporated herein by reference.

[0029] The liner of the present invention can be made in any suitable manner. For example, the layers are co-extruded or different layers are formed separately and they are laminated together. The multilayer film is then "punched out" to form a liner. In a preferred method, the gas barrier layer is a wholly aromatic LCP
And extruded simultaneously with the polyolefin outer layer.

Referring to FIG. 4, another aspect of the present invention is a closure 201 that includes a base wall 207 coupled to a peripheral skirt 208. The peripheral skirt 208 is adjusted so that the skirt connects to the container 205. Inside the closure 201 is a liner 202. Liner 202 is positioned within the closure in any suitable manner, such as by a friction fit or adhesive. Liner 2
When bonding 02, the first outer layer 210 generally directly contacts the base wall 207. Liner 202 may be any of the liners described herein, such as the liners and liner materials described in FIGS. Liner 20
2 includes a first outer layer 210, a second outer layer 212, and a gas barrier layer 214 disposed between the first outer layer 210 and the second outer layer 212. The liner 202 of FIG. 4 may be symmetrical, as long as the gas barrier layer is a LCP, preferably a fully aromatic LCP, or the second outer layer 212 may be a first outer layer 2
It may be thicker or thinner than 10. To minimize gas permeation rate, an LCP gas barrier layer should be
Preferably, it is located within the closure such that it is less than 50 μm, more preferably less than about 75 μm. It should also be understood that multiple gas barrier layers and multiple outer layers can be used in the present invention.

Base wall 207 and peripheral skirt 208
May be any material commonly used in the closure arts, for example, a metal such as aluminum, or a plastic resin. Preferred plastic resins are
Moldable thermoplastic polymers such as polyethylene, polypropylene, ethylene-vinyl acetate, polyethylene terephthalate, polyvinyl chloride and the like.

Further, as shown in FIG.
An adhesive layer may be disposed between 14 and outer layers 210 and 212. It should be understood that all figures in the specification are not drawn to scale and are exaggerated for explanation. FIG. 4 shows a screw-type cap, and in the present invention, a twist-off (twist-
off), anti-theft, crown, lug, tear off, and ring pull (r)
It should also be understood that any type of closure is contemplated, such as ing pull).

While not wishing to be bound by any theory,
It is believed that the closure of the present invention using an asymmetric liner reduces gas permeation by reducing the vent area. The vent area is the second outer layer thickness of the liner times the circumference. Since the ventilation area is a permeable area of the closure, reducing the ventilation area decreases the gas permeation rate.
Moisture decomposition resistant gas barrier layers (e.g., LCP) are preferred for the present invention, as the gas barrier layer must be located closer to the contents of the container to reduce the ventilation area. Moisture sensitive gas barrier layers, such as EVOH, can be used in the present invention, but they are not preferred because prolonged contact with moisture reduces gas barrier properties.

Many features of the present invention will become apparent from the following description of embodiments. They have been set forth for the purpose of describing the invention and are not intended to limit the invention.

[0035]

EXAMPLES 1-3 Preparation of the Liners of Examples 1-3 The liners of Examples 1-3 below were made from multilayer plastic sheets produced by a conventional sheet coextrusion process. Three extruders equipped with a multilayer feed block and a single manifold die were fed with the polymer used for the liner. The feed boxes were used to distribute and / or orient the various polymers and regulate the flow to form multiple layers. The polymer layers from the feed block were then directed to an extrusion slot die and each layer was dispersed both parallel and transverse to the direction of polymer flow to form a film. 3
The roll vertical stack was placed in line with the extrusion die slot and quenched as the molten polymer was cast. The 760 μm sheet was then wound into rolls and die cut to make a 38 mm circular disc for use as a liner.

The EVA material used for the liner was an extruded EVA containing about 9% vinyl acetate. The barrier layer may be made of ethylene-vinyl alcohol (EVOH) or a fully aromatic liquid crystal polymer (LC) containing monomers derived from hydroxybenzoic acid, hydroxynaphthoic acid, terephthalic acid, aminophenol and biphenol.
P). The adhesive layer was a terpolymer of ethylene, methyl acrylate and glycidyl methacrylate (E-M
A-GMA).

The approximate thickness of each layer in Examples 1-3 is shown in Table 1 below. These were estimated based on the volumetric flow through the extruder.

[0038]

[Table 1]

^* Bottom EVA is the layer closest to the container ^** Single layer, total thickness = 760 μm Preparation of Liner of Example 4-9 Liner 4-9 was also prepared by the same coextrusion method as described above. However, these liners were made in two steps. First, a symmetric five-layer cast thin film is manufactured, and then a single-layer E
It was extruded and laminated on a VA sheet.

The film was made by a conventional film casting method in which a molten curtain extruded from a flat, vertically mounted die was drawn onto a single rotating chrome abrasive casting roll. For Example 4-7, a draw ratio of about 4 times (die gap / final sheet thickness) was used and Example 8 was used.
For and 9, a draw ratio of about 10 times was used.

Next, these films were extruded and laminated on an EVA sheet to form a liner having a thickness of about 760 μm. This was done by: The rolls of film were attached to a tension controlled "unwind" station and the film was fed between the first and second rolls of a three roll stack used in a typical sheet extrusion process. EV
A molten sheet of A film is also fed between the second and third rolls, and the adhesion of the films to the single layer EVA sheet melts the film where they meet between the rolls.
This was done by "fusing" the VA polymer. The final sheet was cooled on a roll stack and then pulled to a winder for subsequent use. The laminated sheet was then die cut into a 38 mm disk for use as a liner, as in Examples 1-3 above.

The approximate thicknesses of the thin film layers (ie, barrier, adhesive and thin EVA layers) used to make the liners of Examples 4-9 are shown in Table 2 below. These were estimated based on draw ratio and volumetric flow through the film casting extruder. The thickness of the thicker EVA layer is 760
The difference between the liner thickness in μm and the estimated thin film layer thickness.

[0043]

[Table 2]

^* Bottom EVA is the layer closest to the container. ^** Thin film layer thickness estimated based on draw ratio and volume flow. Example 10-16 Gas Permeation Rate Test For the disk liner of Example 1-9, the following method was used. Gas permeation rate measurements were made: (1) creation of closures,
(2) Conditioning the closure for 1 week at 100% humidity and room temperature; and (3) Testing the closure for gas permeation rate. Closures were made by inserting the 760 μm liner of Examples 1-9 into an approximately 38 mm plastic polypropylene cap. The liner was held in place by a ridge or lip in the cap. These closures were applied to "barrier" PET bottles molded for use with a threaded cap (torque spec: 24 in-lb).
The bottle was then cut 3 mm below the "handling or transfer ring" of the bottle, about 25 mm above the PET bottle.

The closure was conditioned as follows. A small amount of carbonated water was introduced into a cylindrical "manifold" of about 28 mm used as a "special fixture" for testing. This water was needed to provide a 100% relative humidity (RH) environment inside the closure. The manifold is essentially a thin aluminum tube closed at one end, arranged vertically, with vacuum grease O- to allow "sealing" to the inside of the cut PET bottleneck.
Had a ring. The cut top of the bottle with the closure was then clamped to the manifold at the transfer ring. Directly to the clamping thick transfer ring above, and to allow for pressurization was to minimize the CO ₂ transmission loss through the PET bottle. The inside of the closure was then pressurized by introducing 3.0 atmospheres of pure dry CO ₂ from one of the two side ports into the cylindrical manifold. These ports were located below the O-ring.

The outside atmosphere was maintained at 29 ° C. and 75% RH by placing the manifold in an environmental chamber. The closure was then conditioned in this condition for a minimum of 7 days before the gas transmission rate test.

The conditioned closure / bottle on the manifold is then removed from the MoCon C-IV
The gas permeation rate was tested in a carbon dioxide test device.
This device is a standard CO ₂ detector using the infrared (IR) method. The conditioned closure / bottle on the manifold was first placed under an aluminum capture volume container. The aluminum capture volume vessel is essentially an inverted aluminum cup with two gas flow ports similar to that used for the cylindrical manifold. These "capture vessels" were then sealed against the "base" with vacuum grease and O-rings. A nitrogen carrier gas is then applied from one of the two ports to about 50-7.
It was introduced into the capture vessel via a mass flow meter at a rate of 5 cc / min. Gas flowed around the closure / bottle manifold and exited through the other port into the IR detector. Gas was passed through the capture vessel until chart recorder tracing showed a steady baseline ("zero"). During the purge period, the effluent gas stream contained a fine, steady stream of nitrogen and a small amount of CO ₂ to be kinetic permeating from the pressurized closure / bottle.

Next, the test apparatus was switched from the purge mode to the accumulation mode. The total test time in accumulation mode was about 60 minutes. The accumulation mode first measures the IR response to the exhaust gas for 35 minutes and then standard volume CO 2
₂ (0.022 cc at standard pressure and temperature) was injected into the capture vessel and detector loop. The detector response was determined as the difference between the initial gas flow and the IR detection gradient of the gas flow after introducing a known amount of CO ₂ into the flow. The data was then converted to transmission speed.

The gas transmission rates for the liners of Examples 1-9 are shown in Table 3 below.

[0050]

[Table 3]

Comparing Example 12 with Comparative Example C-11, a symmetric liner with a thin LCP (18-20 μm) gas barrier layer may have a much lower gas permeation rate than a thicker (50 μm) EVOH liner. I understand. These examples demonstrate that LCP has excellent gas permeability even when much thinner than EVOH.

Asymmetric liner with LCP thickness of 5-10 μm Comparison of Examples 13 and 18 demonstrates that placing the LCP closer to the container (ie, having a thinner bottom EVA layer) reduces the gas transmission rate. You.

The above is a description of the present invention and should not be construed as limiting the present invention. The present invention is defined by the claims, and equivalents thereof are also included in the claims.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a prior art closure, showing that there is a gas leak path between the container and the closure.

FIG. 2 is a cross-sectional view of one embodiment of a liner according to the present invention.

FIG. 3 is a sectional view of another embodiment of the liner according to the present invention.

FIG. 4 is a cross-sectional view of one embodiment of a closure according to the present invention.

[Explanation of symbols]

 101,201 closure 102,202 liner 103,203 screw screw 105,205 container 106,206 contents 110,210 first outer layer 112,212 second outer layer 114,214 gas barrier layer 130 outer environment 120,122 leakage path 216, 218 adhesive layer

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor David Raymond Constant, New Jersey, USA 07928, Clinton, Rachel Court, New Jersey 13 (72) Inventor Arno Ewald Wolff 08836, Martinsville, NJ, United States , Woodfield Road 1779 (72) Inventor Linda Claire Soyer Sunset Drive, Chatham, New Jersey, USA 07928 14F Term (Reference) 3E084 AA12 AB01 BA02 CA01 CC02 CC03 DA01 DB12 DC02 DC03 FA09 FB01 GA04 GB04 HA02 HB09 HC07 HC09 HD01 KB01 LA17 LB02 LD01

Claims (40)

[Claims] 1. An asymmetric liner suitable for use in a container closure comprising: a first layer; a second layer: the second layer is closer to the container than the first layer; A gas barrier layer between the two layers, wherein the thickness of the second layer is the first
Liner smaller than layer thickness. 2. The liner of claim 1, wherein the gas barrier layer is resistant to moisture degradation. 3. A gas barrier layer comprising a liquid crystal polymer (LCP)
And selected from the group consisting of polyvinylidene chloride,
The liner according to claim 2. 4. The liner of claim 2, wherein the gas barrier is LCP. 5. The liner of claim 4, wherein the LCP is a fully aromatic LCP. 6. LCP is terephthalic acid, isophthalic acid, 1,4-hydroquinone, resorcinol, 4-aminobenzoic acid, 3-aminobenzoic acid, 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 4-aminophenol , 3-aminophenol, 1,4-phenylenediamine, 4,4'-biphenol, 4,4'-biphenyldicarboxylic acid, 6-hydroxy-2-naphthoic acid, 2,6
The liner according to claim 5, wherein the liner is derived from at least one monomer selected from the group consisting of -naphthalenedicarboxylic acid and 2,6-dihydroxynaphthalene. 7. The liner of claim 4, wherein the first and second layers can be the same or different and are selected from the group consisting of thermoplastic elastomers, polyolefins and combinations thereof. 8. The liner of claim 7, wherein the first or second layer is a polyolefin. 9. The liner of claim 8, wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and ethylene-vinyl acetate. 10. A gas barrier layer and a first layer or a second layer.
5. The liner of claim 4, comprising an adhesive layer between the layers. 11. The liner of claim 10, wherein the adhesive layer comprises a functionalized polyolefin material. 12. The liner of claim 11, wherein the functionalized polyolefin material comprises at least one functional group selected from the group consisting of carboxyl groups or esters thereof, carboxylic anhydride groups, glycidyl groups and alkoxysilane groups. . 13. The liner of claim 11, wherein the functionalized polyolefin material is a terpolymer of ethylene, methyl acrylate and glycidyl methacrylate. 14. The method of claim 1, wherein the first layer has a thickness of about 375 to about 1250.
μm, and the thickness of the second layer is less than about 150 μm;
A liner according to claim 4. 15. The method of claim 1, wherein the first layer has a thickness of about 625 to about 875 μm.
5. The liner of claim 4, wherein the thickness of the second layer is less than about 75 μm. 16. The gas barrier layer has a thickness of about 2 to about 15 μm.
The liner according to claim 15, wherein 17. The liner according to claim 16, wherein the first and second layers are ethylene-vinyl acetate. 18. A closure for the container, including: a base wall; a peripheral skirt fixed to the base wall defining an interior of the closure; the skirt is adjusted to connect to the container; and an interior of the interior of the closure. Liner disposed at: The liner comprises: a first layer; a second layer; and a gas barrier layer between the first and second layers: the gas barrier layer is a liquid crystal polymer (LCP).
It is. 19. The closure of claim 18, wherein the liner is asymmetric and the LCP is a fully aromatic LCP. 20. The closure of claim 18, wherein the gas barrier layer is a blend of LCP and a thermoplastic. 21. The closure of claim 20, wherein the thermoplastic resin is a polyolefin selected from the group consisting of polyethylene, polypropylene, polyvinylidene chloride, EVA, and mixtures thereof. 22. The thermoplastic resin is a gas barrier layer selected from the group consisting of polyvinylidene chloride, EVOH, polyethylene terephthalate, polyethylene naphthalate, cyclic olefin copolymer, polyamide, polyacrylonitrile, and mixtures thereof. Item 21. The closure according to Item 20, 23. The closure of claim 20, wherein the blend further comprises a compatibilizer. 24. The closure of claim 19, wherein the second layer is the layer closest to the container, wherein the thickness of the second layer is less than the thickness of the first layer. 25. The second layer is placed in contact with the container,
The closure according to claim 18. 26. The closure of claim 24, wherein the first layer is adhered to the base wall. 27. LCP is terephthalic acid, isophthalic acid, 1,4-hydroquinone, resorcinol, 4-aminobenzoic acid, 3-aminobenzoic acid, 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 4-aminophenol , 3-aminophenol, 1,4-phenylenediamine, 4,4'-biphenol, 4,4'-biphenyldicarboxylic acid, 6-hydroxy-2-naphthoic acid, 2,6
25. The closure of claim 24, wherein the closure is derived from at least one monomer selected from the group consisting of -naphthalenedicarboxylic acid and 2,6-dihydroxynaphthalene. 28. The closure according to claim 27, wherein the first or second layer is a polyolefin. 29. The closure of claim 28, wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and ethylene-vinyl acetate. 30. A gas barrier layer and a first layer or a second layer.
19. The closure of claim 18, comprising an adhesive layer between the layers. 31. The closure of claim 30, wherein the adhesive layer comprises a functionalized polyolefin material. 32. The closure according to claim 31, wherein the functionalized polyolefin material comprises at least one functional group selected from the group consisting of carboxyl groups or esters thereof, carboxylic anhydride groups, glycidyl groups and alkoxysilane groups. . 33. The closure of claim 28, wherein the functionalized polyolefin material is a terpolymer of ethylene, methyl acrylate and glycidyl methacrylate. 34. The first layer having a thickness of about 375 to about 1250
μm, and the thickness of the second layer is less than about 150 μm;
The closure according to claim 24. 35. The first layer having a thickness of about 625 to about 875 μm
25. The closure of claim 24, wherein the thickness of the second layer is less than about 75 [mu] m. 36. The gas barrier layer has a thickness of about 2 to about 15 μm.
36. The closure of claim 35, wherein 37. The closure of claim 36, wherein the first and second layers are ethylene-vinyl acetate. 38. The closure according to claim 18, wherein the gas barrier layer is less than about 150 μm from the container. 39. The closure of claim 18, wherein the gas barrier layer is less than about 75 μm from the container. 40. The closure according to claim 18, wherein the closure is selected from the group consisting of a screw, twist-off, anti-theft, crown, lug, tear-off, and ring pull.
Closure.