JP2005000906A - Amine carrying porous silica, resin composition containing the porous silica and multilayered structure containing resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an adsorbent for an oxygen barrier multilayered structure that scavenges an odor component efficiently accompanying the oxidation reaction of an oxidizing organic component which is an oxygen scavenging component, and to provide the multilayered structure that is excellent in flavoring properties while maintaining the excellent processability and mechanical strengths without transferring the odor component accompanying the oxidative reaction of the oxidizing organic component to the inside and/or outside. <P>SOLUTION: The subject amine carrying porous silica is obtained by bonding a silane coupling agent having an amino group on the surface of the porous silica having a specific surface area of 450 m<SP>2</SP>/g or more and an average pore particle size of 80 Å or less. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an adsorbent for capturing an odorous substance generated by oxidation of an oxidizing organic component contained in an oxygen-absorbing layer of a multilayer structure, and more specifically, has an amino group on the surface thereof. The present invention relates to an amine-supporting porous silica treated with a silane coupling agent.

Conventionally, metal cans, glass bottles, various plastic containers, and the like are used as packaging containers. The plastic container is advantageous in that it is light in weight and excellent in impact resistance to some extent, but it has problems such as deterioration of contents due to oxygen permeating through the container wall and lowering of flavor. In particular, oxygen permeation through the container wall is zero in metal cans and glass bottles, and only the oxygen remaining in the container becomes a problem, whereas in the case of plastic containers, it cannot be ignored through the container wall. Oxygen permeates, which is a problem in terms of storage stability of the contents.
In order to prevent this, as a plastic container, a multilayer structure having at least one resin layer having gas barrier properties such as an ethylene-vinyl alcohol copolymer has been proposed (for example, see Patent Document 1). .
Also, a packaging comprising a polymer having oxygen scavenging properties or a packaging barrier containing a layer of the composition, wherein the composition collects oxygen by metal-catalyzed oxidation of an oxidizable organic component Barriers have been proposed, and polyamides, particularly xylylene group-containing polyamides, are used as oxidizable organic components (see, for example, Patent Document 2).

  Resins with excellent gas barrier properties, such as ethylene-vinyl alcohol copolymer (EVOH), exhibit extremely good oxygen barrier properties under low humidity conditions, but extremely high permeability to oxygen under high humidity conditions. Has the problem. Furthermore, the gas barrier resin is often used in combination with a heat sterilization packaging technique such as hot water sterilization, boil sterilization, or retort sterilization for the purpose of improving the storage stability of the contents. Therefore, during this heat sterilization, EVOH is placed under a high humidity condition, so that not only the oxygen permeability becomes high, but also the water permeability of EVOH has a high oxygen permeability even after the end of sterilization. Subsequently, a predetermined gas barrier property cannot be obtained.

In order to solve such a problem, the present inventors have blended a transition metal catalyst and an oxidizing organic component with a specific gas barrier resin to disperse the oxidizing organic component in the cross section in the thickness direction of the gas barrier layer. It has been found that by controlling the structure and the distribution structure within a specific range, the oxygen permeability coefficient of the multilayer structure during wet heat can be remarkably improved while maintaining excellent processability and mechanical strength (PCT). / JP02 / 13388). In this multilayer structure, the oxidizable organic component is oxidized by the action of the transition metal catalyst to absorb oxygen that passes through the gas barrier resin. The coefficient can be suppressed to a low value.
In addition to the method for suppressing the oxygen permeability coefficient by blending a transition metal catalyst and an oxidizing organic component with the gas barrier resin as described above, the present inventors have added ethylene to a specific thermoplastic resin. By blending a resin containing an unsaturated hydrocarbon and a transition metal catalyst, the resin having an ethylenically unsaturated hydrocarbon triggers the oxidation reaction of the specific thermoplastic resin, and the oxidation of the specific thermoplastic resin. It has been found that the reaction proceeds in a chain and an oxygen-absorbing resin composition having a large amount of oxygen scavenging ability is obtained (Japanese Patent Application No. 2002-243238). Furthermore, the present inventors have found that a hydrogenated styrene-diene copolymer is particularly suitable as a resin that triggers an oxidation reaction of the specific thermoplastic resin (Japanese Patent Application No. 2003-194839). The oxygen-absorbing resin composition containing the specific thermoplastic resin, another resin that triggers the oxidation of the specific thermoplastic resin, and a transition metal catalyst has a large amount of the specific thermoplastic resin that is a matrix. Therefore, a multilayer structure in which a layer made of this oxygen-absorbing resin composition is laminated with a layer made of a gas barrier resin typified by EVOH increases the oxygen permeability of the gas barrier resin. Even under wet heat conditions, the oxygen permeability coefficient of the oxygen-absorbing resin composition can suppress the oxygen permeability coefficient to a low value for a long period of time.

JP-A-1-278344 Japanese National Patent Publication No. 2-500846

However, in the multilayer structure, an odorous substance is generated with the oxidation of the oxidizing organic component which is an oxygen absorbing action, and the odorous substance permeates the oxygen-absorbing layer and other layers of the multilayered structure. As a result, it reaches the outside and inside of the structure, and as a result, the odorous substance is transferred to the contents, resulting in inferior flavor properties. In addition, when storing in a refrigerator, etc., when odor components migrate to other foods stored together, or when opening an outer package that wraps a packaging container using a multilayer structure having an oxidation-absorbing layer There is a problem that a strange odor is produced.
An object of the present invention is to provide an adsorbent for an oxygen barrier multilayer structure that efficiently captures an odor component accompanying an oxidation reaction of an oxidizing organic component that is an oxygen scavenging component.
In addition, the object of the present invention is excellent in wet heat while maintaining excellent processability and mechanical strength without shifting the odor component accompanying the oxidation reaction of the oxidizing organic component to the inside and / or outside. It is to provide a multilayer structure that can maintain gas barrier properties and is excellent in flavor properties.

The present invention provides an amine-supporting porous silica in which a silane coupling agent having an amino group is bonded to the surface of a porous silica having a specific surface area of 450 m ² / g or more and an average pore diameter of 80 mm or less.
The present invention also provides a resin composition comprising the amine-supporting porous silica and a thermoplastic resin having a barrier property against odorous substances.
Furthermore, the present invention provides a multilayer structure having an odor barrier layer and an oxygen-absorbing layer made of the resin composition.

  By using the multilayer structure of the present invention, the odor component accompanying the oxidation reaction of the oxidizing organic component which is an oxygen scavenging component is efficiently adsorbed, and is thermoplastic when dispersed in a thermoplastic resin having a barrier property against the odor substance. Excellent gas barrier properties can be maintained while maintaining excellent processability and mechanical strength without inducing thickening or gelation of the resin.

When amine-supported porous silica treated with a silane coupling agent is included in a multilayer structure having an oxygen-absorbing layer containing an oxidizing organic component, the oxidizing organic component contained in the oxygen-absorbing layer of the multilayer structure It is possible to capture odorous substances that are generated as a result of oxidation. However, when the amine-supported porous silica treated with the silane coupling agent is blended with a thermoplastic resin having a barrier property against odor substances described later, the melt viscosity of the resin composition is changed over time. It has become clear from the examination results of the present inventors that there is a problem of increasing. As a result of further diligent investigations by the present inventors, a multi-layer was obtained by treating the surface of porous silica having a specific surface area of 450 m ² / g or more and an average pore diameter of 80 mm or less with a silane coupling agent having an amino group. It is possible to efficiently capture odorous substances generated with the oxidation of the oxidizing organic component contained in the oxygen-absorbing layer of the structure, and to suppress an increase in the melt viscosity of the resin composition over time. I understood.
The porous silica to be treated with the silane coupling agent preferably has a specific surface area of 450 m ² / g or more, more preferably 450 to 800 m ² / g specific surface area. Further, the porous silica to be treated with the silane coupling agent preferably has an average pore diameter of 80 mm or less, more preferably 30 to 80 mm.
The oil absorption of the porous silica treated with the silane coupling agent is preferably 200 ml / 100 g or less, and more preferably 90 to 180 ml / 100 g.
Furthermore, the average particle diameter of the porous silica to be treated with the silane coupling agent is preferably 1 to 10 μm, and more preferably 1 to 5 μm.
The method for producing the porous silica to be treated with the silane coupling agent is not particularly limited, and a known production method can be used. For example, a porous material obtained by pulverizing and classifying silica synthesized by a wet method. Silica or porous silica synthesized by a dry method can be used in the present invention.

As a silane coupling agent which has an amino group, what is represented by following formula (1) is preferable.
H ₂ N—X—SiR ¹ _n (OR ² ) _3-n (1)

In the formula, n represents 0, 1 or 2.
X represents a linear or branched divalent hydrocarbon group having 1 to 5 carbon atoms. _{Specifically, -CH 2 -, - CH 2} CH 2 -, - CH 2 CH 2 CH 2 -, - CH 2 CH (CH 3) -, - CH 2 CH 2 CH 2 CH 2 -, - CH 2 CH (CH ₃ ) CH ₂ —, —CH ₂ CH ₂ CH (CH ₃ ) —, —CH ₂ C (CH ₃ ) ₂ —, —CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ —, —CH ₂ CH ( _{CH 3) CH 2 CH 2 -} , - CH 2 CH 2 CH (CH 3) CH 2 -, - CH 2 CH 2 CH 2 CH (CH 3) -, - CH 2 C (CH 3) 2 CH 2 -, _{-CH 2 CH 2 C (CH 3} ) 2 - and the like.
R ¹ represents an alkyl group having 1 to 3 carbon atoms. Specifically, —CH ₃ , —CH ₂ CH ₃ , —CH ₂ CH ₂ CH ₃ , —CH (CH ₃ ) CH _{3 and the} like can be mentioned.
R ² represents an alkyl group having 1 to 3 carbon atoms. Specifically, —CH ₃ , —CH ₂ CH ₃ , —CH ₂ CH ₂ CH ₃ , —CH (CH ₃ ) CH _{3 and the} like can be mentioned.
Preferred silane coupling agents having amino groups are γ-aminopropyltriethoxysilane, γ-aminopropyldimethylethoxysilane, γ-aminopropylmethyldiethoxysilane, and γ-aminopropyltrimethoxysilane, which are particularly sanitary. In view of this, γ-aminopropyltriethoxysilane is preferred.

The surface treatment method of the porous silica with the silane coupling agent is not particularly limited, and a known method such as a pretreatment method such as a dry method, a slurry method, a spray method, or an integral blend method is used. be able to. The pretreatment method is preferable in that the silica surface can be uniformly treated.
The amount of the silane coupling agent having an amino group supported on the porous silica is preferably 0.1 to 1 mmol, more preferably 0.3 to 0.8 mmol, with respect to 1 g of the porous silica. .

Next, the multilayer structure containing the amine-supporting porous silica treated with the silane coupling agent will be described.
The amine-supporting porous silica is preferably used as a resin composition blended with a thermoplastic resin having barrier properties against odorous substances.
Examples of the thermoplastic resin having barrier properties against odorous substances include ethylene-vinyl alcohol copolymer, polyamide resin, polyester resin, cyclic olefin resin, and polypropylene. These resins may be used alone or in combination of two or more.
In the present invention, it is desirable to use an ethylene-vinyl alcohol copolymer as a resin particularly excellent in barrier properties against oxygen and aroma components. As the ethylene-vinyl alcohol copolymer, any one known per se can be used. For example, an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol%, particularly 25 to 50 mol%. A saponified copolymer obtained by saponifying the saponification degree so that the saponification degree is 96 mol% or more, particularly 99 mol% or more can be used.
The saponified ethylene-vinyl alcohol copolymer should have a molecular weight sufficient to form a film and is generally measured at 30 ° C. in a mixed solvent of 85:15 by weight ratio of phenol: water. It is desirable to have a viscosity of 01 dL / g or more, particularly 0.05 dL / g or more.

Polyamide resins include (a) an aliphatic, alicyclic or semi-aromatic polyamide derived from a dicarboxylic acid component and a diamine component, (b) a polyamide derived from an aminocarboxylic acid or its lactam, or a copolymer thereof. Examples thereof include polyamides and blends thereof.
Examples of the dicarboxylic acid component include aliphatic dicarboxylic acids having 4 to 15 carbon atoms such as succinic acid, adipic acid, sebacic acid, decanedicarboxylic acid, undecanedicarboxylic acid, and dodecanedicarboxylic acid, and aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid. Examples include acids.
The diamine component includes 1,6-diaminohexane, 1,8-diaminooctane, 1,10-diaminodecane, 1,12-diaminododecane, etc., a straight chain having 4 to 25 carbon atoms, particularly 6 to 18 carbon atoms. Or branched alkylenediamine, bis (aminomethyl) cyclohexane, bis (4-aminocyclohexyl) methane, 4,4'-diamino-3,3'-dimethyldicyclohexylmethane, especially bis (4-aminocyclohexyl) methane, 1 , 3-bis (aminocyclohexyl) methane, alicyclic diamines such as 1,3-bis (aminomethyl) cyclohexane, and araliphatic diamines such as m-xylylenediamine and / or p-xylylenediamine.
As the aminocarboxylic acid component, aliphatic aminocarboxylic acids such as ω-aminocaproic acid, ω-aminooctanoic acid, ω-aminoundecanoic acid, ω-aminododecanoic acid, para-aminomethylbenzoic acid, para-aminophenylacetic acid, etc. And araliphatic aminocarboxylic acid.

Among these polyamides, xylylene group-containing polyamides are preferable, and specifically, polymetaxylylene adipamide, polymetaxylylene sebacamide, polymetaxylylene veramide, polyparaxylylene pimeramide, polymetaxylylene. Homopolymers such as azelamide, and metaxylylene / paraxylylene adipamide copolymer, metaxylylene / paraxylylene pimeramide copolymer, metaxylylene / paraxylylene sebacamide copolymer, metaxylylene / paraxylylene Copolymers such as azeramide copolymers, or homopolymer or copolymer components thereof, aliphatic diamines such as hexamethylenediamine, alicyclic diamines such as piperazine, and para-bis (2aminoethyl) benzene Aromatic diamines, such as terephthalic acid A copolymer obtained by copolymerizing acid, lactam such as ε-caprolactam, ω-aminocarboxylic acid such as 7-aminoheptanoic acid, aromatic aminocarboxylic acid such as para-aminomethylbenzoic acid, and the like. A polyamide obtained from a diamine component mainly composed of xylylenediamine and / or p-xylylenediamine and an aliphatic dicarboxylic acid and / or an aromatic dicarboxylic acid can be particularly preferably used.
These xylylene group-containing polyamides are excellent in gas barrier properties as compared with other polyamide resins, and are preferable for the purpose of the present invention.
These polyamides should also have a molecular weight sufficient to form a film, with a relative viscosity (ηrel) measured at a concentration of 1.0 g / dl in concentrated sulfuric acid and a temperature of 30 ° C. of 1.1 or greater, especially 1. It is desirable to be 5 or more.

Examples of the polyester resin include thermoplastic polyesters derived from aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid and diols such as ethylene glycol, so-called gas barrier polyesters. This gas barrier polyester comprises a terephthalic acid component (T) and an isophthalic acid component (I) in a polymer chain.
T: I = 95: 5 to 5:95
Especially 75:25 to 25:75
The ethylene glycol component (E) and the bis (2-hydroxyethoxy) benzene component (BHEB),
E: BHEB = 99.999: 0.001-2.0: 98.0
Especially 99.95: 0.05-40: 60
In a molar ratio. As BHEB, 1,3-bis (2-hydroxyethoxy) benzene is preferable.
The polyester should have a molecular weight that is at least sufficient to form a film, and is generally 0.3% as measured in a 60:40 weight ratio mixed solvent of phenol and tetrachloroethane at a temperature of 30 ° C. It is desirable to have an intrinsic viscosity [η] of ˜2.8 dl / g, especially 0.4 to 1.8 dl / g.
A polyester resin mainly composed of polyglycolic acid or a polyester resin obtained by blending this polyester resin, a polyester resin derived from the above aromatic dicarboxylic acid and diols can also be used.

（２）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） The cyclic olefin-based resin is an alicyclic hydrocarbon compound having an ethylenically unsaturated bond and a bicyclo ring, particularly a hydrocarbon compound having a bicyclo [2,2,1] hept-2-ene skeleton. The following may be mentioned, but the invention is not limited to these.
Bicyclo [2.2.1] hept-2-ene derivative: For example, a bicyclo [2.2.1] hept-2-ene derivative represented by the following formula (1). In particular, bicyclo [2.2.1] hept-2-ene, 6-methylbicyclo [2.2.1] hept-2-ene, 5,6-dimethylbicyclo [2.2.1] hept-2-ene Ene, 1-methylbicyclo [2.2.1] hept-2-ene, 6-ethylbicyclo [2.2.1] hept-2-ene, 6-n-butylbicyclo [2.2.1] hept 2-ene, 6-isobutylbicyclo [2.2.1] hept-2-ene, 7-methylbicyclo [2.2.1] hept-2-ene.

(2)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（３）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Tricyclo [4.3.0.12.5] -3-decene derivative: For example, a tricyclo [4.3.0.12.5] -3-decene derivative represented by the following formula (2). In particular, tricyclo [4.3.0.12.5] -3-decene, 2-methyltricyclo [4.3.0.12.5] -3-decene5-methyltricyclo [4.3.0 .12.5] -3-decene.

(3)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（４）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Tricyclo [4.4.0.12.5] -3-undecene derivative: For example, a tricyclo [4.4.0.12.5] -3-undecene derivative represented by the following formula (3). In particular, tricyclo [4.4.0.12.5] -3-undecene, 10-methyltricyclo [4.4.0.12.5] -3-undecene.

(4)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（５）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Tetracyclo [4.4.0.12.5.17.10] -3-dodecene derivative, for example, tetracyclo [4.4.0.12.5.17.10]-represented by the following formula (4) 3-dodecene derivative. In particular, tetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-methyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8- Ethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-propyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8- Butyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-isobutyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8- Hexyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-cyclohexyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8- Stearyltetracyclo [4.4.0.12.5.17.10] 3-dodecene, 5,10-dimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 2,10-dimethyltetracyclo [4.4.0.12.5.17 .10] -3-dodecene, 8,9-dimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-ethyl-9-methyltetracyclo [4.4.0 12.5.17.10] -3-dodecene, 11,12-dimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 2,7,9-trimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 2,7-dimethyl-9-ethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene 9-isobutyl-2,7-dimethyltetracyclo [4.4.0. 2.5.17.10] -3-dodecene, 9,11,12-trimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 9-ethyl-11,12- Dimethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 9-isobutyl-11,12-dimethyltetracyclo [4.4.0.12.5.17.10]- 3-dodecene, 5,8,9,10-tetramethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-ethylidenetetracyclo [4.4.0.12. 5.17.10] -3-dodecene, 8-ethylidene-9-methyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-ethylidene-9-ethyltetracyclo [ 4.4.0.12.5.17.10] -3-do Decene, 8-ethylidene-9-isopropyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-ethylidene-9-butyltetracyclo [4.4.0.12.5 17.10] -2R-dodecene, 8-n-propylidenetetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-n-propylidene-9-methyltetracyclo [ 4.4.0.12.5.17.10] -3-dodecene, 8-n-propylidene-9-ethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-n-propylidene-9-isopropyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-n-propylidene-9-butyltetracyclo [4.4.0.12 5.17.10] -3-Dodece 8-isopropylidenetetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-isopropylidene-9-methyltetracyclo [4.4.0.12.5.17. 10] -3-dodecene, 8-isopropylidene-9-ethyltetracyclo [4.4.0.12.5.17.10] -3-dodecene, 8-isopropylidene-9-isopropyltetracyclo [4. 4.0.12.5.17.10] -3-dodecene, 8-isopropylidene-9-butyltetracyclo [4.4.0.12.5.17.10] -3-dodecene.

(5)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（６）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Pentacyclo [6.5.1.13.6.02.77.09.13] -4-pentadecene derivative; for example, pentacyclo [6.5.1.13.6.02 represented by the following formula (5) 7.09.13] -4-pentadecene derivative. In particular, pentacyclo [6.5.1.13.6.0.2.7.09.13] -4-pentadecene, 1,3-dimethylpentacyclo [6.5.1.13.6.6.0.7.0.09. .13] -4-pentadecene, 1,6-dimethylpentacyclo [6.5.1.13.6.02.77.09.03] -4-pentadecene, 14,15-dimethylpentacyclo [6.5 1.13.6.6.0.7.09.13] -4-pentadecene.

(6)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（７）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Pentacyclo [7.4.0.12.5. 19.12.08.13] -3-pentadecene derivative, for example, pentacyclo [7.4.0.12.55.19.12.08.13] -3-pentadecene derivative represented by the following formula (6). In particular, pentacyclo [7.4.0.12.55.19.12.08.13] -3-pentadecene, methyl-substituted pentacyclo [7.4.0.12.55.19.12.08.13]- 3-pentadecene.

(7)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（８）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Pentacyclo [6.5.1.13.3.6.02.77.09.13] -4,10-pentadecadiene derivative, for example, pentacyclo [6.5.1.13. 6.0.2.7.09.13] -4,10-pentadecadiene derivative.
In particular, pentacyclo [6.5.1.13.6.0.2.7.7.0.13] -4,10-pentadecadien.

(8)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（９）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Pentacyclo [8.4.0.12.5.19.12.08.13] -3-hexadecene derivative, for example, pentacyclo [8.4.0.12.5.19. 12.08.13] -3-Hexadecene derivative. In particular, pentacyclo [8.4.0.12.5.19.12.08.13] -3-hexadecene, 11-methyl-pentacyclo [8.4.0.12.5.19.12.08.13. ] -3-hexadecene, 11-ethyl-pentacyclo [8.4.0.12.55.19.12.08.13] -3-hexadecene, 10,11-dimethyl-pentacyclo [8.4.0.12] .5. 19.12.08.13] -3-Hexadecene.

(9)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１０）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Pentacyclo [6.6.1.13.6. 02.7. 09.14] -4-hexadecene derivative, for example, pentacyclo [6.6.1.13.6.6.07.09.04] -4-hexadecene derivative represented by the following formula (9). In particular, pentacyclo [6.6.1.13.6.0.2.7.09.14] -4-hexadecene, 1,3-dimethylpentacyclo [6.6.1.13.6.6.0.7.0.09. .14] -4-hexadecene, 1,6-dimethylpentacyclo [6.6.1.13.6.02.77.09.04] -4-hexadecene, 15,16-dimethylpentacyclo [6.6 1.13.6.6.07.07.014] -4-hexadecene.

(10)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１１）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Hexacyclo [6.6.1.13.6. 110.13. 02.7. 09.14] -4-heptadecene derivative, for example, hexacyclo [6.6.1.13.6.110.13. 02.7.09.14] -4-heptadecene derivative. In particular, hexacyclo [6.6.1.13.6.110.3.03.0.7.0.14] -4-heptadecene, 12-methylhexacyclo [6.6.1.13.6.110.13. 0.02.7.14] -4-heptadecene, 12-ethylhexacyclo [6.6.1.13.6.110.13.02.7.7.0.14] -4-heptadecene, 12-isobutyl Hexacyclo [6.6.1.13.6.110.13.02.7.7.0.14] -4-heptadecene, 1,6,10-trimethyl-12-isobutylhexacyclo [6.6.1. 13.6.10.13.02.7.7.0.14] -4-heptadecene.

(11)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１２）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Heptacyclo [8.7.0.12.99.14.7.11.11.7.0.8.0.12.16] -5-eicosene derivative, for example, heptacyclo [8.7 represented by the following formula (11) .0.12.99.14.7.11.111.7.0.8.02.116] -5-eicosene derivative. In particular, heptacyclo [8.7.0.12.99.14.7.11.111.7.0.8.02.116] -5-eicosene.

(12)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１３）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Heptacyclo [8.7.0.13.6.110.110.112.15.02.7.011.16] -4-eicosene derivative, for example, heptacyclo [8.7 represented by the following formula (12) 0.13.6.110.17.12.12.15.02.7.011.16] -4-eicosene derivative. In particular, heptacyclo [8.7.0.13.6.110.17.12.12.15.02.7.01.16] -4-eicosene, dimethyl substituted heptacyclo [8.7.0.13.6.110 17.112.15.02.7.7.011.16] -4-eicosene.

(13)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１４）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Heptacyclo [8.8.0.12.99.14.7.11.111.8.03.8.12.17] -5-heneicosene derivative, for example, heptacyclo [8.8 represented by the following formula (13) 0.12.99.14.7.11.111.8.03.08.012.17] -5-heneicosene derivative. In particular, heptacyclo [8.8.0.12.99.14.7.11.111.18.8.08.02.117] -5-henecocene.

(14)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１５）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Heptacyclo [8.8.0.14.7. 111.18. 113.16. 03.8. 02.17] -5-heneicosene derivative, for example, heptacyclo [8.8.0.14.7.111.18.113.16.6.0.8.0.17] -5 represented by the following formula (14): -Haneicosene derivatives. In particular, heptacyclo [8.8.0.14.7.11.11.18.113.16.8.08.012.17] -5-heneicosene, 15-methyl-heptacyclo [8.8.0.14.7 111.18.113.13.16.8.08.012.17] -5-heneicosene, trimethyl-substituted heptacyclo [8.8.0.14.7.11.11.18.11.113.6.0.8.012. 17] -5-Hanekosen.

(15)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１６）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Octacyclo [8.8.0.12.99.14.7.11.111.18.11.16.3.8.8.012.17] -5-docosene derivative, for example, octacyclo represented by the following formula (15) [8.8.8.01.92.97.14.7.11.11.113.16.6.0.8.0.12.17] -5-docosene derivative. In particular, octacyclo [8.8.0.12.99.14.7.11.11.18.113.16.8.08.02.117] -5-docosene, 15-methyloctacyclo [8.8.0. 12.19.14.7.11.111.8.13.16.08.08.12.17] -5-docosene, 15-ethyloctacyclo [8.8.0.12.99.14.7. 111.18.013.16.03.08.02.17] -5-docosene.

(16)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１７）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Nonacyclo [10.9.1.14.77.13.20.1158.18.02.10.03.8.012.21.014.19] -5-pentacocene derivative, for example, represented by the following formula (16) Nonacyclo [10.9.1.14.77.13.20.1158.18.02.10.03.8.012.21.014.19] -5-pentacene derivatives. In particular, nonacyclo [10.9.1.14.77.13.20.115.18.8.02.10.03.8.8.12.21.014.19] -5-pentaccocene, dorimethyl substituted nonacyclo [10.9 1.14.7.113.20.1158.18.01.00.03.8.012.21.014.19] -5-pentacene.

(17)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

（１８）
（式中、Ｒは水素原子、アルキル基、シクロアルキル基又はアルキリデン基であり、ｎは１〜４の整数である。） Nonacyclo [10.10.15.18.18.14.21.1116.19.02.11.04.99.03.13.22.015.20] -6-hexacocene derivative, for example, in the following formula (17) The represented nonacyclo [10.10.15.18.18.14.21.1116.19.02.11.04.99.03.13.22.015.20] -6-hexacocene derivative. In particular, nonacyclo [10.10.15.18.18.14.21.1116.19.02.11.04.99.03.13.22.015.20] -6-hexacocene.

(18)
(In the formula, R is a hydrogen atom, an alkyl group, a cycloalkyl group or an alkylidene group, and n is an integer of 1 to 4.)

  Other examples of cyclic olefins include 5-phenyl-bicyclo [2.2.1] hept-2-ene, 5-methyl-5-phenylbicyclo [2.2.1] hept-2-ene, 5- Benzyl-bicyclo [2.2.1] hept-2-ene, 5-tolyl-bicyclo [2.2.1] hept-2-ene, 5- (ethylphenyl) -bicyclo [2.2.1] hept 2-ene, 5- (isopropylphenyl) -bicyclo [2.2.1] hept-2-ene, 5- (biphenyl) -bicyclo [2.2.1] hept-2-ene, 5- (β -Naphthyl) -bicyclo [2.2.1] hept-2-ene, 5- (α-naphthyl) -bicyclo [2.2.1] hept-2-ene, 5- (anthracenyl) -bicyclo [2. 2.1] hept-2-ene, 5,6-diphenyl-bicyclo [ 2.2.1] Hept-2-ene, cyclopentadiene-acenaphthylene adduct, 1,4-methano-1,4,4a, 9a-tetrahydrofluorene, 1,4-methano-1,4,4a, 5 10,10a-Hexahydroanthracene, 8-phenyl-tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8-methyl-8-phenyl-tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8-benzyl-tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8-tolyl-tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (ethylphenyl) -tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (isopropylphenyl) -tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8,9-diphenyl-tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (biphenyl) tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (β-naphthyl) tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (α-naphthyl) -tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, 8- (anthracenyl) -tetracyclo [4.4.0.12.5. 17.10] -3-dodecene, a compound obtained by further adding cyclopentadiene to (cyclopentadiene-acenaphthylene adduct), 11,12-benzo-pentacyclo [6.5.1.13.6. 02.7. 09.13] -4-pentadecene, 11,12-benzo-pentacyclo [6.6.1.13.6. 02.7. 09.14] -4-hexadecene, 11-phenyl-hexacyclo [6.6.1.13.6. 110.13. 02.7. 09.14] -4-heptadecene, 14,15-benzo-heptasis 3N [8.7.0.12.9. 14.7. 111.17. 03.8. 02.16-5-eicosene].

This resin (COC) is derived from 50 to 22 mol%, especially 40 to 22 mol% of cyclic olefin and the remaining ethylene and has a glass transition point (Tg) of 200 ° C. or less, particularly 150 to 60 ° C. It is good.
The molecular weight of this resin is not particularly limited, but it should have an intrinsic viscosity [η] of 0.1 to 20 dl / g measured in decalin at 135 ° C. Generally, it is 10% or less, particularly 5% or less as measured by a diffraction method.
The resin (COC) can be obtained by random polymerization of an olefin and a cyclic olefin in the presence of a known vanadium catalyst or metallocene catalyst. A suitable cyclic olefin resin (COC) is commercially available from Mitsui Petrochemical Co., Ltd. under the trade name of Apel.
The cyclic olefin-based resin is preferably used alone, but in the form of a blended product with other olefin-based resin in a range that does not impair the essence thereof, that is, in an amount less than 50% by weight, particularly in an amount of 30% by weight or less. May be used. As other olefin resins, olefin homopolymers and copolymers are preferably used. For example, low density, medium density or high density polyethylene, linear low density polyethylene, polypropylene, polybutene-1, polypentene-1, poly-4-methylpentene-1, propylene-ethylene copolymer, ionomer, ethylene-acrylic copolymer Examples thereof include a polymer and an ethylene-vinyl acetate copolymer. These olefin resins may be used alone or in combination of two or more.
As the polypropylene, homopolypropylene is preferable.
The thermoplastic resin preferably has a glass transition point (Tg) of 50 ° C. or higher. The amine-supporting porous silica is preferably used in an amount of 0.1 to 5% by weight in the thermoplastic resin, and the addition method may be added as it is, but may be added in the form of a masterbatch. It is preferable from the viewpoint of dispersibility.

The multilayer structure of the present invention is preferably a multilayer structure having an odor barrier layer and an oxygen-absorbing layer made of the resin composition.
The oxygen-absorbing layer in the multilayer structure of the present invention contains an oxidizing organic component and a transition metal catalyst. The oxidizing organic component exhibits an action of absorbing oxygen by being oxidized.
As the oxidizing organic component, a mixture of a thermoplastic resin (A) having an ethylene structure in the molecular structure and a resin (B) which is a resin other than the resin (A) and triggers oxidation of the resin (A) is also suitable. Used.
Examples of the resin (A) include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, linear ultra low density polyethylene, isotactic or syndiotactic polypropylene, and ethylene-propylene copolymer. , Polybutene-1, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ion-crosslinked olefin copolymer, or these The blended material etc. are mentioned. In addition, an acid-modified olefin resin obtained by using these resins as a base polymer and graft-modified with an unsaturated carboxylic acid or a derivative thereof can also be used as the resin (A).
Preferably, the resin (A) is a low density polyethylene, a medium density polyethylene, a high density polyethylene, a linear low density polyethylene, a linear ultra low density polyethylene, an ethylene-propylene copolymer, an ethylene-butene-1 copolymer, or the like. Ethylene copolymers, particularly preferably low density polyethylene and linear low density polyethylene. These resins may be used alone or in combination of two or more.

The resin (B) that triggers the oxidation of the resin (A) includes a resin having an ethylenically unsaturated hydrocarbon in the main chain or side chain, a resin containing a tertiary carbon atom in the main chain, and an active methylene group in the main chain Can be mentioned.
These may be contained alone in the resin, or may be contained in a combination of two or more.
The resin having an ethylenically unsaturated hydrocarbon in the main chain or side chain is preferably a resin containing a unit derived from a linear or cyclic conjugated or non-conjugated polyene.
Examples of these monomers include conjugated dienes such as butadiene and isoprene; 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4 -Chain non-conjugated dienes such as hexadiene, 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene; methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene-2- Cyclic non-conjugated dienes such as norbornene, 5-isopropylidene-2-norbornene, 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, dicyclopentadiene; 2,3-diisopropylidene -5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propeni Triene such as 2,2-norbornadiene and the like.
Specific polymers include conjugated diene polymers such as poly-1,2-butadiene, poly-1,4-butadiene, poly-1,2-isoprene, poly-1,4-isoprene; Examples thereof include conjugated diene copolymers such as polymers and styrene-isoprene copolymers; ethylene-propylene-nonconjugated diene copolymers.
As the resin having tertiary carbon in the main chain, a polymer or copolymer having a benzene ring in the side chain is preferably used.
Of these, a styrene copolymer having a benzene ring in the side chain is preferable because the trigger effect on the resin (A) is remarkable, such as a styrene-diene copolymer or a copolymer obtained by hydrogenating the diene portion. Is preferred. In particular, a styrene-isoprene-styrene triblock copolymer which is a kind of styrene-isoprene copolymer, a hydrogenated styrene-isoprene-styrene triblock copolymer obtained by subjecting a diene portion to hydrogenation treatment, and a hydrogenated styrene-butadiene. -Styrene triblock copolymers are preferred.

In addition to using the oxidizing organic component comprising the resin (A) and the resin (B), only a resin having an ethylenically unsaturated hydrocarbon can be used as the oxidizing organic component. In this case, a form in which a resin having an ethylenically unsaturated hydrocarbon is used by being blended with a gas barrier thermoplastic resin that does not substantially oxidize during the period of use is preferable.
When blended with a gas barrier resin, the resin having an ethylenically unsaturated hydrocarbon preferably has a functional group. Examples of the functional group include a carboxylic acid group, a carboxylic acid anhydride group, a carboxylic acid ester group, a carboxylic acid amide group, an epoxy group, a hydroxyl group, an amino group, and a carbonyl group. Is particularly preferable in terms of compatibility. These functional groups may exist in the side chain of the resin or may exist in the terminal.
Examples of the monomer used to introduce these functional groups include ethylenically unsaturated monomers having the above functional groups.
As a monomer used for introducing a carboxylic acid group or a carboxylic anhydride group into a resin having an ethylenically unsaturated hydrocarbon, it is desirable to use an unsaturated carboxylic acid or a derivative thereof. Specifically, Α, β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, bicyclo [2,2,1] hept-2-ene-5,6- Unsaturated carboxylic acids such as dicarboxylic acids, maleic anhydride, itaconic anhydride, citraconic anhydride, α, β unsaturated carboxylic anhydrides such as tetrahydrophthalic anhydride, bicyclo [2,2,1] hept-2-ene And unsaturated carboxylic acid anhydrides such as -5,6-dicarboxylic acid anhydride.
In the acid modification of a resin having an ethylenically unsaturated hydrocarbon, a resin having an ethylenically unsaturated hydrocarbon is used as a base polymer, and an unsaturated carboxylic acid or a derivative thereof is graft-copolymerized to the base polymer by means known per se. However, it can also be produced by random copolymerization of the above-mentioned resin having an ethylenically unsaturated hydrocarbon and an unsaturated carboxylic acid or a derivative thereof.
A resin having an ethylene-based hydrocarbon having a carboxylic acid or a carboxylic acid anhydride group that is particularly suitable for dispersibility in a gas barrier resin has a carboxylic acid or a derivative thereof having an acid value of 5 KOHmg / g or more. The liquid resin is preferably contained in an amount.
When the content of the unsaturated carboxylic acid or derivative thereof is in the above range, the resin having an ethylenically unsaturated hydrocarbon is well dispersed in the gas barrier resin, and oxygen is smoothly absorbed.
When blended in a gas barrier resin, the resin having an ethylenically unsaturated hydrocarbon is 2 × 10 ⁻³ mol or more at room temperature per gram of the resin having an ethylenically unsaturated hydrocarbon in the presence of a transition metal catalyst. It preferably has an ability to absorb 4 × 10 ⁻³ mol or more of oxygen. That is, when the oxygen absorption capacity is equal to or higher than the above value, it is not necessary to blend a resin having a large amount of ethylenically unsaturated hydrocarbon into the gas barrier resin in order to develop good oxygen barrier properties. The processability and moldability of the resin composition are not reduced.
The carbon-carbon double bond in the resin having an ethylenically unsaturated hydrocarbon used in the present invention is not particularly limited. Even if it exists in the main chain in the form of vinylene group, it also has a side chain in the form of vinyl group. It may be present as long as it can be oxidized.
As the gas barrier resin, the above-described thermoplastic resins such as an ethylene-vinyl alcohol copolymer, a polyamide resin, and a polyester resin are preferably used. These resins may be used alone or in combination of two or more.

The transition metal catalyst is preferably a Group VIII metal component of the periodic table such as iron, cobalt and nickel, but also a Group I metal such as copper and silver: Group IV metals such as tin, titanium and zirconium, vanadium Group V, Group VI such as chromium, and Group VII metal components such as manganese. Among these metal components, the cobalt component has a high oxygen absorption rate and is particularly suitable for the purpose of the present invention.
The transition metal catalyst is generally used in the form of a low-valent inorganic acid salt, organic acid salt or complex salt of the transition metal.
Examples of inorganic acid salts include halides such as chlorides, sulfur oxyacid salts such as sulfates, nitrogen oxyacid salts such as nitrates, phosphorus oxyacid salts such as phosphates, and silicates.
On the other hand, examples of the organic acid salt include a carboxylate, a sulfonate, and a phosphonate. The carboxylate is suitable for the purpose of the present invention, and specific examples thereof include acetic acid, propionic acid, and isopropion. Acid, butanoic acid, isobutanoic acid, pentanoic acid, isopentanoic acid, hexanoic acid, heptanoic acid, isoheptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, 3,5,5-trimethylhexanoic acid, decanoic acid, neodecanoic acid , Undecanoic acid, Lauric acid, Myristic acid, Palmitic acid, Margaric acid, Stearic acid, Arachic acid, Linderic acid, Tuzic acid, Petroceric acid, Oleic acid, Linoleic acid, Linolenic acid, Arachidonic acid, Formic acid, Oxalic acid, Sulfamine Examples thereof include transition metal salts such as acid and naphthenic acid.

  On the other hand, as the transition metal complex, a complex with β-diketone or β-keto acid ester is used, and examples of β-diketone or β-keto acid ester include acetylacetone, ethyl acetoacetate, 1,3-cyclohexane. Sadione, methylenebis-1,3-cyclohexadione, 2-benzyl-1,3-cyclohexadione, acetyltetralone, palmitoyltetralone, stearoyltetralone, benzoyltetralone, 2-acetylcyclohexanone, 2-benzoylcyclohexanone 2-acetyl-1,3-cyclohexanedione, benzoyl-p-chlorobenzoylmethane, bis (4-methylbenzoyl) methane, bis (2-hydroxybenzoyl) methane, benzoylacetone, tribenzoylmethane, diacetylbenzoylmethane Stearoylbenzoylmethane, palmitoylbenzoylmethane, lauroylbenzoylmethane, dibenzoylmethane, bis (4-chlorobenzoyl) methane, bis (methylene-3,4-dioxybenzoyl) methane, benzoylacetylphenylmethane, stearoyl (4-methoxybenzoyl) ) Methane, butanoylacetone, distearoylmethane, acetylacetone, stearoylacetone, bis (cyclohexanoyl) -methane, dipivaloylmethane, and the like can be used.

As an oxidizing organic component, a thermoplastic resin (A) having an ethylene structure in the molecular structure, a resin other than the resin (A) and a resin (B) that triggers oxidation of the resin (A), and a transition metal catalyst When using this oxygen-absorbing resin composition, the resin (B) is preferably blended in an amount of 1 to 10% by weight based on the total weight of the resin (B) and the resin (A). If the compounding quantity of the said resin (B) exists in this range, the trigger effect of the said resin (B) will express efficiently, and degradation during shaping | molding can be suppressed. The transition metal catalyst is preferably 10 to 3000 ppm, particularly 50 to 1000 ppm as the amount of transition metal with respect to the total weight of the oxygen-absorbing resin composition. When the transition metal catalyst is in the above range, the oxygen-absorbing layer has a sufficient oxygen-absorbing ability and can maintain the moldability of the resin composition.
On the other hand, when an oxygen-absorbing resin composition in which a gas barrier resin is blended with a resin having an ethylenically unsaturated hydrocarbon and a transition metal catalyst is used as the oxygen-absorbing layer, the resin having an ethylenically unsaturated hydrocarbon is The content is preferably 1 to 30% by weight, particularly 3 to 20% by weight, based on the resin composition. If the blending amount of the resin having an ethylenically unsaturated hydrocarbon is within the above range, the oxygen-absorbing layer has a sufficient oxygen-absorbing ability and can maintain the moldability of the resin composition. Further, the transition metal catalyst is preferably contained in an amount of 100 to 1000 ppm, particularly 200 to 500 ppm as the amount of transition metal with respect to the total weight of the oxygen-absorbing resin composition.
If the amount of the transition metal catalyst is within the above range, good gas barrier properties can be obtained, and deterioration tendency during kneading and molding of the oxygen-absorbing resin composition can be suppressed.
When a resin composition comprising a resin having an ethylenically unsaturated hydrocarbon and a transition metal catalyst is used for the oxygen-absorbing layer in the gas-barrier resin, the area-method average dispersed particle size in the thickness direction cross section of the oxygen-absorbing layer is 1 μm or less It is also important to control the dispersion state of the resin having an ethylenically unsaturated hydrocarbon so that the area ratio occupied by the dispersed particles is 1% or more. If the dispersed particle diameter is within the above range, good moldability can be obtained, the barrier property is not lowered under high humidity, and if the area ratio is within the above range, a good barrier is obtained. Sex can be obtained.

Various means can be used for blending the oxygen-absorbing resin composition, but a method using a twin screw extruder equipped with a side feed is preferred. The kneading by the twin-screw extruder is preferably performed in a non-oxidizing atmosphere in order to minimize the deterioration of the oxygen-absorbing resin composition. In addition, it is extremely important to maintain the performance of the oxygen-absorbing resin composition that the residence time is short and the molding temperature is as low as possible.

The oxygen-absorbing layer used in the present invention is not generally necessary, but a known activator can be blended if desired. Suitable examples of activators include, but are not limited to, polymers containing hydroxyl and / or carboxyl groups such as polyethylene glycol, polypropylene glycol, ethylene / methacrylic acid copolymers, various ionomers, and the like.
The oxygen-absorbing layer used in the present invention includes a filler, a colorant, a heat stabilizer, a weather stabilizer, an antioxidant, an anti-aging agent, a light stabilizer, an ultraviolet absorber, an antistatic agent, a metal soap and a wax, etc. A known resin compounding agent such as a lubricant, a modifying resin or a rubber can be blended according to a formulation known per se.
For example, by incorporating a lubricant, the bite of the resin into the screw is improved. Lubricants include metal soaps such as magnesium stearate and calcium stearate, hydrocarbons such as fluid, natural or synthetic paraffin, micro wax, polyethylene wax and chlorinated polyethylene wax, and fatty acid systems such as stearic acid and lauric acid. Fatty acid monoamides or bisamides such as stearic acid amide, valmitic acid amide, oleic acid amide, esylic acid amide, methylene bisstearamide, ethylene bisstearamide, butyl stearate, hydrogenated castor oil, ethylene An ester type such as glycol monostearate, an alcohol type such as cetyl alcohol and stearyl alcohol, and a mixed system thereof are generally used.

In the multilayer structure of the present invention, the odor barrier layer is located outside and / or inside the oxygen-absorbing layer. Here, the inside of the oxygen-absorbing layer refers to the side in contact with the contents when the multilayer container of the present invention is used as a packaging container, and the outside of the oxygen-absorbing layer is the outside of the container. Say the side. Thereby, an odor component can be adsorb | sucked and the transfer to the outer side and inner side of a multilayer structure of an odor component can be prevented still more effectively.
In the present invention, the cup, tray, bottle, tube container is provided by providing the oxygen-absorbing layer and the odor barrier layer located outside and / or inside the oxygen-absorbing layer and combining other resin layers as necessary. A plastic multilayer structure in the form of a pouch or the like.
In general, the oxygen-absorbing layer is preferably provided on the inner side of the outer surface of the container so as not to be exposed on the outer surface of the container, and the inner side of the container or the like for the purpose of avoiding direct contact with the contents. It is preferable to provide it outside the surface. Thus, it is desirable to provide an oxygen-absorbing layer as an intermediate layer of a multilayer resin container.
The odor barrier layer is also preferably located as an intermediate layer outside or inside the oxygen-absorbing layer. More preferably, it is located as an intermediate layer outside and inside the oxygen-absorbing layer. In order to further improve the odor barrier property, two or more odor barrier layers made of different types of resins may be provided.

It is also possible to combine other resin layers other than the oxygen-absorbing layer and the odor barrier layer, and examples thereof include moisture-resistant resins such as olefin resins and thermoplastic polyester resins.
Examples of the olefin resin include polyethylene (PE) such as low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and linear very low density polyethylene (LVLDPE). , Polypropylene (PP), ethylene-propylene copolymer, polybutene-1, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene-1 copolymer, ethylene-vinyl acetate Examples thereof include copolymers, ion-crosslinked olefin copolymers (ionomers), and blends thereof.
The thermoplastic polyester resin includes polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), a polyester resin mainly composed of polyglycolic acid, or a copolymer polyester thereof, and further Examples include blends.

A suitable example of the container laminated structure is as follows, in which the oxygen-absorbing layer is represented as OBR and the odor barrier layer is represented as SBR. The left side is represented as the outer surface side, and the right side is represented as the inner surface side.
Four layer structure: PET / SBR / OBR / PET, PET / OBR / SBR / PET, PE / SBR / OBR / PE, PE / OBR / SBR / PE, PP / SBR / OBR / PP, PP / OBR / SBR / PP, PE / SBR / OBR / PET, PE / OBR / SBR / PET,
Five-layer structure: PE / SBR1 / OBR / SBR2 / PE, PET / SBR1 / OBR / SBR2 / PET, PET / SBR / PE / OBR / PET, PET / OBR / PE / SBR / PET,
Etc.
In manufacturing the laminate, an adhesive resin may be interposed between the resin layers as necessary.
As such an adhesive resin, a carbonyl (—CO—) group based on a carboxylic acid, a carboxylic acid anhydride, a carboxylate, a carboxylic acid amide, a carboxylic acid ester or the like is used in a main chain or a side chain of 1 to 700 mm. Examples include thermoplastic (meq) / 100 g resin, particularly thermoplastic resin contained at a concentration of 10 to 500 (meq) / 100 g resin. Suitable examples of the adhesive resin include ethylene-acrylic acid copolymer, ion-crosslinked olefin copolymer, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, acrylic acid grafted polyolefin, ethylene-vinyl acetate copolymer. , One or a combination of two or more of copolyester and copolymer thermoplasticity. These resins are useful for lamination by coextrusion or sandwich lamination.
In addition, an isocyanate-based or epoxy-based thermosetting adhesive resin is also used for adhesive lamination with a preformed oxygen-absorbing barrier resin film, odor barrier resin film, and moisture-resistant resin film.

In the multilayer structure of the present invention, the thickness of the oxygen-absorbing layer is not particularly limited, but is generally in the range of 3 to 100 μm, particularly 5 to 80 μm. That is, if the thickness of the oxygen-absorbing layer is within the above range, good gas barrier performance can be obtained, and the above range is also from the viewpoint of container properties such as economy and material flexibility and flexibility. preferable.
The thickness of the odor barrier layer is not particularly limited, but it is generally preferably in the range of 5 to 50 μm, particularly 10 to 40 μm. That is, if the thickness of the odor barrier layer is within the above range, good odor barrier properties can be expressed, and, as with the oxygen-absorbing layer, containers such as economy, material flexibility and flexibility are used. The above range is preferable from the viewpoint of characteristics.
In the multilayer structure of the present invention, the overall thickness varies depending on the application, but it is generally 30 to 7000 μm, particularly 50 to 5000 μm.
The thickness of the oxygen-absorbing layer is suitably 0.5 to 95%, particularly 1 to 50% of the total thickness.
The thickness of the odor barrier layer is suitably 0.5 to 20%, particularly 1 to 10% of the total thickness.

The multilayer structure of the present invention can be produced by a method known per se, except that the above-described oxygen-absorbing layer and the odor barrier layer are disposed outside thereof.
That is, for the production of the multilayer structure of the present invention, a publicly known coextrusion molding method can be used. For example, using a number of extruders according to the type of resin, a multi-layered multi-die is used. Extrusion molding may be performed.
In the production of the multilayer structure of the present invention, a multilayer injection molded article can be produced by a co-injection method or a sequential injection method using a number of injection molding machines corresponding to the type of resin.
Furthermore, for the production of a film or sheet using the multilayer structure of the present invention, an extrusion coating method or sandwich lamination can be used, and a multilayer film or sheet is produced by dry lamination of a film formed in advance. You can also
Packaging materials such as film can be used as packaging bags of various forms, and the bags can be produced by a known bag making method. Ordinary pouches with three- or four-side seals, pouches with gussets. , Standing pouches, pillow packaging bags, and the like, but are not limited to this example.
The packaging container using the multilayer structure of the present invention is useful as a container that can prevent a decrease in flavor of the contents due to oxygen.
Contents that can be filled include beer, wine, fruit juice, carbonated soft drink, oolong tea, green tea for beverages, fruits, nuts, vegetables, meat products, infant foods for food, coffee, jam, mayonnaise, ketchup, cooking oil, Examples include dressings, sauces, boiled dairy products, dairy products, and the like, and other products such as pharmaceuticals, cosmetics, gasoline, etc. that are susceptible to deterioration in the presence of oxygen, but are not limited to these examples.
The said packaging container is good also as a package further packaged by the exterior body.
Next, an Example and a comparative example are shown and this invention is demonstrated.

(Porous silica)
The following basic physical properties were measured for porous silica (Mizusawa Chemical Industry Co., Ltd .: gel type porous silica) serving as the base of the amine-supporting porous silica.
[Measurement of average particle size]
1 g of porous silica was put into 100 g of distilled water and stirred sufficiently to prepare an aqueous dispersion. This liquid was applied to a laser diffraction particle size distribution analyzer (SALD-3000: Shimadzu Corporation), and the average particle size was measured on a volume basis by a laser scattering method.
[Measurement of oil absorption]
The oil absorption of the porous silica was measured based on a method according to JIS K5101.21.
[Specific surface area measurement]
The specific surface area of the porous silica was calculated by the BET method for determining the surface area from the amount of nitrogen gas physically adsorbed on the solid surface.
[Measurement of average pore diameter]
From the value obtained from the measurement of the specific surface area: Sc [m ² / g] and the total pore volume V V (ml / g) obtained by using the adsorption of nitrogen gas, the average fineness of the porous silica is obtained. Pore diameter: D was determined.

(Amine-supporting porous silica)
[Preparation of amine-supported porous silica]
The porous silica powder was added to a predetermined amount of γ-aminopropyltriethoxysilane (SH6020: Toray Dow Corning Silicone Co., Ltd.), and pure water was further added and sufficiently stirred. Thereafter, the slurry was filtered with a Buchner funnel and washed until the electric conductivity of the filtrate was 20 μS / cm or less. The washed powder was dried at 100 ° C. for 12 hours to obtain amine-supported silica.
[Amine loading]
Measurement was performed in accordance with JIS K0102.45.2 “Measurement Method of Total Nitrogen by UV Absorption Spectrophotometry” to determine the amount of amino groups per unit mass of amine-supporting porous silica.
[Evaluation of deodorizing performance of amine-supported porous silica]
Heptanal was selected as an aldehyde used for evaluation, and this was diluted with methanol to prepare a 2 wt% odor standard solution. 1 μl of this standard solution is weighed with a microsyringe, 0.5 mg of the prepared amine-supporting porous silica is placed in a vial with a capacity of 20 ml together with 1.0 ml of distilled water, and a lid with aluminum tape attached to the inner surface side. It was put on the mouth and sealed with an aluminum cap from above. After being stored for 3 days under a condition of 30 ° C., the amount of volatile components in the container was measured using a gas chromatograph (6890: Agilent Technology) with a headspace sampler (7694: Agilent Technology). With reference to the value measured without the amine-supporting porous silica, the sample containing the amine-supporting porous silica was reduced by 50% or more than this value, ○, 30 to less than 50% △, 0 to less than 30% was evaluated as x.

(Compatibility with resin)
[Preparation of resin composition]
Using a twin-screw extruder (TEM-35B: Toshiba Machine Co., Ltd.) equipped with a strand die at the outlet part, using a powder feeder by the side feed method while pulling a high vacuum vent at a screw rotation speed of 100 rpm, 5 parts by weight of amine-supported porous silica is blended with 100 parts by weight of ethylene-vinyl alcohol copolymer resin (Kuraray F101B Co., Ltd.), a strand is drawn at a molding temperature of 200 ° C., and pellets of the desired resin composition Was made.
[Supply state of silica powder by powder feeder]
The supply state when the amine-supporting porous silica was blended with the ethylene-vinyl alcohol copolymer resin was visually evaluated. The case where the supply amount was stable was evaluated as ◯, the case where the supply was unstable such as when the amine-supporting porous silica powder flew into the air when blended, and the case where the supply was unstable due to blocking or the like.
[Measurement of relative viscosity of molten resin]
Capillograph (Toyo Seiki Co., Ltd.) was used for examining the dispersion suitability and temporal stability of the silica powder with respect to the resin for the prepared pellet. The measurement conditions were a nozzle (D: 1.0 mm, L: 10 mm), left at a temperature of 200 ° C. for 2 minutes, and after confirming that the resin was melted, a velocity viscosity measurement of 0.5 to 500 mm / min was performed.
The viscosity of the initial thickening ratio ethylene-vinyl alcohol copolymer resin and the viscosity of the resin composition containing the produced amine-supporting porous silica were measured by the above method, and the apparent viscosity at a shear rate of 6.08 sec ⁻¹ was measured. On the basis of the evaluation, the following formula was used. Pellets having a relative viscosity of 3 or more were evaluated as “x”.

この初期増粘率は、アミン担持多孔質シリカのエチレン−ビニルアルコール共重合体樹脂への分散性を表す尺度である。

This initial thickening rate is a measure representing the dispersibility of the amine-supported porous silica in the ethylene-vinyl alcohol copolymer resin.

Viscosity increase after standing for 30 minutes Compared to the case of measuring after leaving the resin on the capillograph for 2 minutes, the increase in viscosity when aging at 200 ° C. for 30 minutes was determined from the following formula. The pellets with an increase in viscosity of 1.3 or more were evaluated as “x”, those having a viscosity less than 1.1 to 1.3 were evaluated as Δ, and those having a viscosity less than 1.1 were evaluated as ◯.

この２００℃で３０分放置後の樹脂組成物の粘度増加は、樹脂組成物の熱安定性を表す尺度であり、経時による粘度増加が１に近いほど、樹脂組成物の熱安定性が良いことを示している。

The increase in the viscosity of the resin composition after standing at 200 ° C. for 30 minutes is a measure representing the thermal stability of the resin composition. The closer the increase in viscosity over time to 1, the better the thermal stability of the resin composition. Is shown.

(Multilayer structure)
[Odor barrier material]
The prepared resin composition (a blend of amine-supported porous silica and ethylene-vinyl alcohol copolymer resin (Kuraray F101B)) was used as an odor barrier material.
[Production of oxygen absorber]
Polyethylene oxygen absorber low density polyethylene resin (JB221R: Nippon Polyolefin Co., Ltd.) 95 parts by weight, styrene-isoprene-styrene triblock copolymer resin (SIS 5200: JSR Co., Ltd.) 5 parts by weight and cobalt content 14% by weight of cobalt neodecanoate (DICNATE5000: Dainippon Ink & Chemicals, Inc.) was blended in an amount of 350 ppm in terms of cobalt, and the mixture was preliminarily kneaded with a stirring dryer (Dalton Co., Ltd.) and charged into the hopper. Next, using a twin-screw extruder (TEM-35B: Toshiba Machine Co., Ltd.) equipped with a strand die at the outlet portion, a low vacuum vent was drawn at a screw rotation speed of 100 rpm, and extruded into a strand shape to produce pellets. .
Ethylene-vinyl alcohol copolymer-based oxygen absorbing material Ethylene-vinyl alcohol copolymer resin pellets (EP-F101B: Kuraray Co., Ltd.) copolymerized with 32 mol% of ethylene and cobalt neodecanoate with a cobalt content of 14% by weight ( DICnate 5000: Dainippon Ink Chemical Co., Ltd.) was blended in an amount of 350 ppm in terms of cobalt amount, and after pre-kneading with a stirring dryer (Dalton Co., Ltd.), it was put into a hopper. Next, using a twin screw extruder (TEM-35B: Toshiba Machine Co., Ltd.) equipped with a strand die at the outlet portion, while pulling a low vacuum vent at a screw rotation speed of 100 rpm, an acid value of 40 KOHmg / g 5 parts by weight of maleic anhydride-modified polybutadiene (M-2000-20: Shin Nippon Petrochemical Co., Ltd.) was added dropwise to 95 parts by weight of an ethylene-vinyl alcohol copolymer to which cobalt was adhered, and the molding temperature was 200. Strands were drawn at 0 ° C. to produce pellets.
[Production of multilayer structure]
Using a direct blow molding machine, the odor barrier material, oxygen absorbing material, low density polyethylene (JB221R: Nippon Polyolefin Co., Ltd.), and adhesive resin (Modic L522: Mitsubishi Chemical Corporation) produced by the above method are used. A multilayer structure was produced. Using a molding temperature of 200 ° C., a shell diameter of 15 mm, and a core of 13 mm, a wide-mouthed bottle (diameter 44 mm, internal volume 125 cc) was produced.
When the polyethylene-based oxygen absorbing material is used, the layer structure is lower density polyethylene (LDPE) resin layer (100 μm) / adhesive layer (5 μm) / odor barrier layer (8 μm) / adhesive layer (5 μm) / polyethylene from the outer layer side. There are four types and nine layers of oxygen absorbing layer (20 μm) / adhesive layer (5 μm) / odor barrier layer (8 μm) / adhesive layer (5 μm) / low density polyethylene (LDPE) resin layer (100 μm).
When the ethylene-vinyl alcohol copolymer-based oxygen absorber is used, the layer structure is lower density polyethylene (LDPE) resin layer (100 μm) / adhesive layer (5 μm) / odor barrier layer (8 μm) / ethylene-vinyl than the outer layer side. There are four types and seven layers of an alcohol copolymer system oxygen-absorbing layer (20 μm) / odor barrier layer (8 μm) / adhesive layer (5 μm) / low density polyethylene (LDPE) resin layer (100 μm).

[Evaluation of formability]
During the production of the multilayer structure, the presence or absence of gelation or the like due to the change in the resin pressure of the odor barrier material or the reaction between the resin and the coupling agent was evaluated. Compared to the initial stage of molding, the resin pressure increase during molding was ± 10% or less, ◯, ± 10 to less than 30% was Δ, and ± 30% or more was increased, and gel was generated was marked X.
[Evaluation of appearance]
The appearance of the produced multilayer structure was visually evaluated.
[Odor evaluation]
1 cc of distilled water was added to the produced multilayer structure, and the bottle was heat-sealed with a lid material using an aluminum foil as a barrier layer at the opening of the bottle. The bottle was aged for one month under the conditions of 30 ° C. and 100% RH, then the lid of the bottle was broken, and the odor in the bottle was evaluated by a sensory test with five panelists. The case where no odor was felt was indicated by ○, the case where a slight odor was felt was indicated by △, and the case where odor was felt was indicated by ×.

[Example 1]
Porous silica (P-752 (Mizusawa Chemical Co., Ltd.): average particle size 2.2 μm, specific surface area 450 m ² / g, average pore size 80 mm, oil absorption 160 ml / 100 g) and γ-aminopropyltriethoxysilane 0.3 mmol / g was supported to produce amine-supported porous silica. Next, a resin composition in which this amine-supporting porous silica and an ethylene-vinyl alcohol copolymer resin were blended was produced, and a multilayer structure having a polyethylene-based oxygen absorber layer was produced using the resin composition.

[Example 2]
Except that γ-aminopropyltriethoxysilane was supported at 0.4 mmol / g on porous silica (average particle size 2.2 μm, specific surface area 550 m ² / g, average pore diameter 60 mm, oil absorption 130 ml / 100 g) A multilayer structure was produced in the same manner as in Example 1.

[Example 3]
A multilayer structure was produced in the same manner as in Example 1 except that a multilayer structure having an ethylene-vinyl alcohol copolymer-based oxygen absorber layer was used.

[Example 4]
Porous silica (P-766 (Mizusawa Chemical Co., Ltd.): average particle diameter 6.5 μm, specific surface area 620 m ² / g, average pore diameter 29 mm, oil absorption 90 ml / 100 g) and γ-aminopropyltriethoxysilane A multilayer structure was produced in the same manner as in Example 1 except that 0.3 mmol / g was supported.

[Example 5]
A multilayer structure was produced in the same manner as in Example 1 except that 2 mmol / g of γ-aminopropyltriethoxysilane was supported.

[Example 6]
Except that γ-aminopropyltriethoxysilane was supported at 0.05 mmol / g on porous silica (average particle size 0.5 μm, specific surface area 560 m ² / g, average pore diameter 70 mm, oil absorption 150 ml / 100 g) A multilayer structure was produced in the same manner as in Example 1.

[Example 7]
Except that γ-aminopropyltriethoxysilane was supported at 0.3 mmol / g on porous silica (average particle size 12.5 μm, specific surface area 550 m ² / g, average pore size 44 mm, oil absorption 150 ml / 100 g) A multilayer structure was produced in the same manner as in Example 1.

[Comparative Example 1]
Porous silica (P-707 (Mizusawa Chemical Co., Ltd.): average particle size 2.4 μm, specific surface area 270 m ² / g, average pore size 240 mm, oil absorption 250 ml / 100 g) was added with γ-aminopropyltriethoxysilane. A multilayer structure was produced in the same manner as in Example 1 except that 0.3 mmol / g was supported.

[Comparative Example 2]
Porous silica (P-604 (Mizusawa Chemical Co., Ltd.): average particle size 1.6 μm, specific surface area 55 m ² / g, average pore size 95 mm, oil absorption 130 ml / 100 g) was added γ-aminopropyltriethoxysilane. A multilayer structure was produced in the same manner as in Example 1 except that 0.3 mmol / g was supported.

[Comparative Example 3]
A resin composition in which the porous silica used in Example 1 and the ethylene-vinyl alcohol copolymer resin were blended was prepared, and a multilayer structure having a polyethylene-based oxygen absorber layer was prepared using the resin composition.
Table 1 shows the deodorizing performance of the amine-supporting porous silica in the above Examples and Comparative Examples, and Table 2 shows the results of evaluation of blendability with the resin, moldability of the multilayer structure, appearance, and odor.

表１及び２の結果から明らかなように、アミンの担持量や多孔質シリカの性質（平均粒径、比表面積、平均細孔径、吸油量）の違いにより、脱臭性能、樹脂との成形性、多層構造体の外観評価で相違が見られた。

As is clear from the results in Tables 1 and 2, the deodorization performance, moldability with resin, and the difference in amine loading and porous silica properties (average particle diameter, specific surface area, average pore diameter, oil absorption) Differences were observed in the appearance evaluation of the multilayer structure.

Claims (9)

An amine-supported porous silica obtained by bonding a silane coupling agent having an amino group to the surface of a porous silica having a specific surface area of 450 m ² / g or more and an average pore diameter of 80 mm or less.   The amine-supporting porous silica according to claim 1, wherein the porous silica has an oil absorption of 200 ml / 100 g or less. The amine-supporting porous silica according to claim 1 or 2, wherein the silane coupling agent having an amino group is represented by the following formula (1).
H ₂ N—X—SiR ¹ _n (OR ² ) _3-n (1)
(In the formula, n represents 0, 1 or 2,
X represents a linear or branched divalent hydrocarbon group having 1 to 5 carbon atoms,
R ¹ represents an alkyl group having 1 to 3 carbon atoms,
R ² represents an alkyl group having 1 to 3 carbon atoms. )   The amine-supporting porous silica according to any one of claims 1 to 3, wherein 0.1 to 1 mmol / g of a silane coupling agent having an amino group is supported on the porous silica.   The amine-carrying porous silica according to any one of claims 1 to 4, wherein the average particle diameter of the porous silica is 1 to 10 µm.   The amine-supporting porous silica according to any one of claims 1 to 5, for capturing an odorous substance generated along with oxidation of an oxidizing organic component contained in the oxygen-absorbing layer of the multilayer structure.   A resin composition comprising the amine-supporting porous silica according to any one of claims 1 to 6 and a thermoplastic resin having barrier properties against odorous substances.   The resin composition according to claim 7, wherein the thermoplastic resin is an ethylene-vinyl alcohol copolymer.   A multilayer structure having an odor barrier layer and an oxygen-absorbing layer comprising the resin composition according to claim 7 or 8.