WO2015137450A1 - 酸素吸収性樹脂組成物 - Google Patents
酸素吸収性樹脂組成物 Download PDFInfo
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- WO2015137450A1 WO2015137450A1 PCT/JP2015/057307 JP2015057307W WO2015137450A1 WO 2015137450 A1 WO2015137450 A1 WO 2015137450A1 JP 2015057307 W JP2015057307 W JP 2015057307W WO 2015137450 A1 WO2015137450 A1 WO 2015137450A1
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- oxygen
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3415—Five-membered rings
- C08K5/3417—Five-membered rings condensed with carbocyclic rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
- B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/012—Additives improving oxygen scavenging properties
Definitions
- the present invention relates to an oxygen-absorbing resin composition containing a compound having an oxygen-absorbing characteristic by itself as an oxygen absorbent.
- Thermoplastic resins such as polyester resins such as polyethylene terephthalate (PET) are excellent in properties such as moldability, transparency, mechanical strength and chemical resistance, and have a relatively high gas barrier property such as oxygen. For this reason, polyester resins are used in various fields as packaging materials for films, sheets, bottles and the like. Further, in order to improve the gas barrier property of such a packaging material, a layer made of a gas barrier resin having an excellent gas barrier property such as a saponified ethylene-vinyl acetate copolymer or polyamide is interposed through an appropriate adhesive resin layer. A multilayer structure provided as an intermediate layer between inner and outer layers made of a polyester resin is also known.
- an inorganic oxygen absorbent such as iron powder as a means for improving the oxygen barrier property.
- Such an oxygen absorbent exhibits a barrier property by absorbing oxygen by being oxidized and blocking oxygen permeation through oxygen absorption.
- the inorganic oxygen absorbent colors the resin, it is not applied to the field of packaging that requires transparency. Accordingly, in the field of packaging, it is common to use an organic oxygen absorbent that does not cause resin coloring.
- Patent Document 1 proposes an oxygen-absorbing resin composition containing an organic oxygen absorbent (oxidizing organic component) such as unmodified polybutadiene and maleic anhydride-modified polybutadiene.
- Patent Document 2 proposes an oxygen scavenging composition containing a compound having an unsaturated alicyclic structure (cyclohexene structure) as an organic oxygen absorbent.
- Patent Documents 3 and 4 by the present applicant include: The following formula: Where Ring X is an aliphatic ring having one unsaturated bond, n is a number of zero or one; Y is an alkyl group, An acid anhydride represented by the following: an ester derived from the acid anhydride, a derivative such as an amide, an imide, or a dicarboxylic acid; or a polymer containing a structural unit derived from the acid anhydride; An oxygen-absorbing resin composition contained as has been proposed.
- the organic oxygen absorbent as described above is not disadvantageous in that the resin serving as the binder is colored unlike the inorganic oxygen absorbent, but according to the study by the present inventors, as the oxygen is absorbed. There was a problem of yellowing. Although the degree of this yellowing is not so great, it cannot be ignored in the field of packaging containers that require transparency, and improvements are required.
- an object of the present invention is to provide an oxygen-absorbing resin composition containing an organic oxygen absorbent and effectively solving the problem of yellowing due to oxygen absorption.
- Another object of the present invention is to provide a packaging container having a layer containing the oxygen-absorbing resin composition.
- the present inventors While examining the organic oxygen absorbent, the present inventors selected a bisimide compound obtained by reacting an aliphatic diamine with an anhydride having a tetrahydrophthalic anhydride structure as an organic oxygen absorbent, By using this organic oxygen absorbent in combination with a small amount of a transition metal catalyst, the inventors have found a new finding that yellowing due to oxygen absorption can be effectively suppressed without impairing oxygen absorbability, thereby completing the present invention. It was.
- the content of the bisimide compound (B) is 1.0 to 5.0% by weight, and the content of the transition metal catalyst (C) is 20 to 100 ppm in terms of metal, (2) the aliphatic diamine has an acyclic structure; Is preferred.
- a packaging container having a layer containing the above oxygen-absorbing resin composition.
- the oxygen-absorbing resin composition of the present invention uses an organic oxygen absorbent ⁇ that is, component (B) ⁇ as an oxygen-absorbing component, the problem of coloring is effectively avoided. Furthermore, since the specific bisimide compound derived from the acid anhydride of formula (1) and the aliphatic diamine is used as the organic oxygen absorbent, the problem of yellowing due to oxygen absorption is effectively suppressed. Has been.
- the bisimide used as the organic oxygen absorbent exhibits extremely high heat resistance. For this reason, even if it melt-kneads with polyester resins, such as polyethylene terephthalate (PET) which requires the melt kneading at high temperature, the oxygen absorptivity is not impaired.
- PET polyethylene terephthalate
- the oxygen-absorbing resin composition of the present invention containing the above bisimide as an organic oxygen absorbent has excellent properties such as non-coloring properties, yellowing resistance, and heat resistance in addition to oxygen barrier properties due to oxygen absorption. Therefore, it is useful in the field of packaging containers that require transparency, and is also suitably used as a heat-resistant container that is stretch-formed and has improved heat resistance and strength by heat setting.
- the oxygen-absorbing resin composition of the present invention contains (A) a base resin, (B) an organic oxygen absorbent, and (C) a transition metal catalyst as essential components.
- Various compounding agents known per se are blended within a range not impairing the object of the present invention.
- the base resin functions as a matrix for dispersing (B) an organic oxygen absorbent and (C) a transition metal catalyst described below.
- the base resin a thermoplastic resin is used from the viewpoint of moldability and the like.
- thermoplastic base resin any thermoplastic resin can be used as long as it can be molded, and examples thereof include the following.
- Olefin resins such as low density polyethylene, high density polyethylene, polypropylene, poly 1-butene, poly 4-methyl-1-pentene or ⁇ -olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene Random or block copolymers, cyclic olefin copolymers, etc .
- Ethylene / vinyl copolymers such as ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl chloride copolymer, etc .
- Styrenic resin such as polystyrene, acrylonitrile / styrene copolymer, ABS, ⁇ -methylstyrene / styrene copolymer, etc .
- Vinyl resins such as polyvinyl chloride, polyvinyliden
- the oxygen-absorbing composition of the present invention exhibits an oxygen barrier property due to oxygen absorption, and further, since yellowing due to oxygen absorption is suppressed, among the thermoplastic resins exemplified above, olefin-based resins and polyester resins It is preferable to use as a base resin what is preferably used as a packaging material, and since the (B) bisimide compound (organic oxygen absorbent) described later exhibits high heat resistance, the heat exemplified above Among the plastic resins, the glass transition temperature (Tg) is high, and when the polyester resin kneaded and molded at a high temperature is used as the base resin, the advantages of the present invention can be maximized.
- Such a polyester resin only needs to have at least a molecular weight sufficient to form a film.
- the intrinsic viscosity (IV) is 0.6 to 1.40 dl / g.
- a polyester resin in the range of 0.63 to 1.30 dl / g is preferably used.
- thermoplastic polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, these polyesters and polycarbonate, Blends such as arylate resins can be used.
- a packaging grade PET polyester in which 60 mol% or more, more preferably 80 mol% or more of the ester repeating units are ethylene terephthalate units is particularly preferably used.
- Such packaging grade PET-based polyester has no unsaturated group, has a glass transition point (Tg) as high as 50 to 90 ° C., particularly 55 to 80 ° C., and has a melting point (Tm). ) Is in the range of 200-275 ° C.
- dibasic acids other than terephthalic acid include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid and naphthalenedicarboxylic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; succinic acid and adipic acid , Aliphatic dicarboxylic acids such as sebacic acid and dodecanedioic acid; or a combination of two or more.
- diol component other than ethylene glycol examples include one or more of propylene glycol, 1,4-butanediol, diethylene glycol, 1,6-hexylene glycol, cyclohexanedimethanol, bisphenol A ethylene oxide adduct, and the like. Is mentioned.
- the gas barrier resin is a resin excellent in oxygen barrier property, and by using the gas barrier resin as a base resin, the useful life of the oxygen absorbent is extended, and the excellent oxygen barrier property is expressed over a long period of time. Can do.
- the barrier property with respect to gas other than oxygen for example, water vapor
- gas barrier resin examples include nylon 6, nylon 6,6, nylon 6 / 6,6 copolymer, polymetaxylylene adipamide (MXD6), nylon 6,10, nylon 11, nylon 12, A polyamide resin such as nylon 13 is representative.
- amount of terminal amino groups is 40 eq / 10 6 g or more, particularly 50 eq / 10 poly meta xylylene adipamide exceeding 6 g, because resistance is high with respect to oxidative degradation, which is preferable.
- a gas barrier resin other than the polyamide resin an ethylene-vinyl alcohol copolymer is representative.
- the gas barrier resin as described above only needs to have a molecular weight enough to form a film.
- an organic oxygen absorbent (B) that absorbs oxygen the following formula (1): Where Ring X is an aliphatic ring having one unsaturated bond, n represents the number of substituents Y bonded to the ring X, and is an integer of 0 or 1.
- Y is an alkyl group, A bisimide compound derived from an acid anhydride represented by and an aliphatic diamine is used. In this bisimide compound, the unsaturated bond portion in the unsaturated ring in the molecule is easily oxidized, whereby oxygen is absorbed and oxygen absorbability is exhibited. For example, unsaturated bonds in aromatic rings do not exhibit such oxidizability.
- the bisimide compound is organic, it is not colored and can be suitably used for applications requiring transparency, and also has good heat resistance and a polyester resin such as PET having a high molding temperature. Even when used as a resin, its excellent properties are not impaired.
- the unsaturated bond in the unsaturated alicyclic structure in the bisimide compound is oxidized, the ring is not cleaved, and a low molecular weight decomposition product (for example, ketone or aldehyde) is not by-produced by the oxidation. Therefore, even if a bisimide compound having such an unsaturated alicyclic structure is used as an oxygen-absorbing component, no off-flavor is generated during oxygen absorption. Therefore, when the said bisimide compound (B) is used as a packaging material and a packaging container is shape
- a low molecular weight decomposition product for example, ketone or aldehyde
- a layer comprising this composition can be disposed on the side in contact with the container contents, and further comprising this composition.
- the container can be formed with only layers (ie, a single layer structure).
- this layer exhibits excellent oxygen barrier properties due to its excellent oxygen absorption, so that the wall of the container can be made thinner, which is extremely important from the viewpoint of weight reduction and resource saving of the container. It will be advantageous.
- the above-mentioned bisimide compound is used as the organic oxygen absorbent (B), and by using it together with a small amount of the transition metal catalyst (C) described later, the problem of yellowing due to oxygen absorption is effectively obtained. Can be suppressed. This is the greatest advantage of the present invention.
- the bisimide compound can be obtained by reacting an unsaturated aliphatic ring-containing acid anhydride of formula (1) with an aliphatic diamine and heat-treating the resulting amide.
- a cyclohexene ring is preferable, but a bridging group (for example, a methylene group or A bicyclo ring having an ethylene group) or a ring having a polycyclic structure in which an aliphatic ring is further bonded to the bicyclo ring is also suitable.
- a polycycle include the following formula (1a); (1a) In the formula, Z is a methylene group or an ethylene group. The thing containing bicyclo ring structure represented by these is mentioned.
- the ring carbon atom to which the bridging group Z is bonded is a tertiary carbon atom, and this tertiary carbon atom is also easily oxidized. Therefore, the oxygen absorptivity by oxidation is further improved.
- polycyclic ring examples include, but are not limited to, the following.
- the positional relationship between the unsaturated bond in the ring X and the acid anhydride group bonded to the ring X is basically not particularly limited as long as the oxidizability of the unsaturated bond is not impaired. In consideration of the synthesis property and the stability of the compound, the following positional relationship is preferable.
- ring X is a cyclohexene ring;
- the bonding carbon atom of the acid anhydride group is at the 1st and 2nd positions, and the unsaturated bond is at the 3rd or 4th position.
- Ring X is bicyclo [2.2.1] hept-2-ene; With respect to the unsaturated bond at the 2-position, the bonding carbon atom of the acid anhydride group is at the 5-position and 6-position.
- Ring X is tricyclo [4.4.0.1 2.5 ] -3-undecene; With respect to the unsaturated bond at the 3-position, the bonding carbon atom of the acid anhydride group is at the 8-position and 9-position.
- Ring X is tetracyclo [4.4.0.1 2.5 . 1 7.10 ] when 3-dodecene; With respect to the unsaturated bond at the 3-position, the bonding carbon atom of the acid anhydride group is at the 8-position and 9-position.
- Ring X is pentacyclo [8.4.0.1 2.5 . 1 9.12 .
- Y represents a substituent bonded to the aliphatic ring X.
- Y is an alkyl group.
- Such an alkyl group is not particularly limited, but is generally a lower alkyl group having 3 or less carbon atoms, particularly a methyl group, from the viewpoint of synthesis and oxidizability.
- the number n of such substituents Y is not particularly limited, but the substituent Y is bonded to at least two carbon atoms forming the unsaturated bond of the ring X. Structure should be avoided. This is because if the substituent Y (alkyl group) is bonded to both of these carbon atoms, the oxidizability of the unsaturated bond is impaired. That is, in the present invention, as long as the substituent Y is not bonded to both of the two carbon atoms, the number n of substituents Y (alkyl groups) is 2 or more. Of course, it may be zero.
- the number n of substituents Y is preferably zero or one.
- the number n is 1, for example, when the ring X is a cyclohexene ring, the substituent Y (alkyl group) is preferably bonded to either the 3-position or the 4-position, and bicyclo [2.2 .1] In the case of hepta-2-ene, it is desirable that it is bonded to the 3-position.
- the above-mentioned acid anhydride of the formula (1) is synthesized by, for example, a Diels-Alder reaction between maleic anhydride and a diene.
- the most preferred examples of the acid anhydride of the above formula (1) include 3-methyl- ⁇ 4 -tetrahydrophthalic anhydride represented by the following formula (2) and the following formula (3): There may be mentioned 4-methyl- ⁇ 3 -tetrahydrophthalic anhydride.
- the bisimide compound (B) used as the organic oxygen absorbent in the present invention is obtained by heat-treating an amide formed by reacting the above acid anhydride with an aliphatic diamine.
- the intermediate product amide and the final product bisimide are represented by the following formulae.
- X and R are the same as described above.
- the diamine to be reacted with the acid anhydride is an aliphatic diamine.
- examples and comparative examples described later are used. As shown in FIG. 1, yellowing due to oxygen absorption cannot be avoided.
- the aliphatic diamine to be reacted with the acid anhydride is not particularly limited as long as it can react with the above acid anhydride, and the divalent aliphatic group between the amino groups is linear or branched.
- any cyclic hydrocarbon group may be used, but in view of high yellowing prevention effect, an alkylene diamine which is a non-cyclic (that is, linear or branched) alkylene group such as methylene diamine, Ethylenediamine and propylenediamine are preferred.
- acid anhydrides and aliphatic diamines can be selected from a plurality of types and used for the reaction.
- the obtained bisimide compound has an asymmetric structure.
- the amount of the organic oxygen absorbent (B) blended into the thermoplastic base resin (A) described above is in the range of 0.1 to 10.0% by weight in the resin composition, Preferably, it is in the range of 1.0 to 5.0% by weight. If this amount is less than the above range, the oxygen absorbability becomes unsatisfactory, and if it is used in a larger amount than the above range, the tendency to yellow due to oxygen absorption becomes remarkable.
- the transition metal catalyst is used for accelerating the oxidation of the bisimide compound (B) and increasing its oxygen absorption capacity, and is commonly used in combination with an organic oxygen absorbent. It is.
- transition metals in such a transition metal catalyst are iron, cobalt, nickel, copper, silver, tin, titanium, zirconium, vanadium, chromium, manganese, and the like. Cobalt is optimal from the viewpoint of promoting the oxidation of the agent (B) ⁇ and increasing the oxygen absorption.
- Such transition metal catalysts are generally used in the form of low-valent inorganic salts, organic salts or complex salts of these transition metals. The specific form is known and is described in detail in, for example, Japanese Patent Application Laid-Open No. 2004-161796.
- the transition metal catalyst should be incorporated in a small amount.
- the amount in terms of metal is in the range of 10 to 350 ppm, preferably in the range of 20 to 100 ppm in the resin composition.
- the blending amount of the transition metal catalyst is larger than the above range, it is difficult to effectively suppress yellowing due to oxygen absorption. Probably, low-molecular-weight components such as aldehyde are generated by oxidation, and this may be caused by yellowing.
- compositions of the present invention containing the above-described components (A) to (C) as essential components, there are various types of materials within a range that does not impair the yellowing-suppressing ability, oxygen-absorbing property, moldability, and the like.
- Compounding agents such as fillers, colorants, heat stabilizers, weathering stabilizers, antioxidants, anti-aging agents, light stabilizers, UV absorbers, antistatic agents, lubricants such as metal soaps and waxes, and modifying resins Or rubber
- the oxygen-absorbing resin composition of the present invention described above is generally prepared by kneading the above-described components using a extruder or the like in a non-oxidizing atmosphere. It is also possible to adopt means such as mixing in advance and mixing the remaining components later.
- a master batch pellet is obtained by melt-kneading a part of the thermoplastic base resin (A), the oxygen absorbent (B), and other compounding agents appropriately blended while degassing using a twin screw extruder.
- the remaining thermoplastic base resin (A) can be kneaded and used for molding immediately before use.
- the thermoplastic resin used for preparing the masterbatch and the thermoplastic resin kneaded later may have different physical properties.
- the physical properties can be adjusted according to the application.
- the transition metal catalyst (C) is blended homogeneously, so that the transition metal catalyst is mixed with an appropriate organic solvent (for example, an organic solvent such as alcohol, ether, ketone, or hydrocarbon). It is preferable to prepare a solution dissolved in (3) and mix this solution with other components in a kneader such as an extruder.
- the oxygen-absorbing resin composition of the present invention not only exhibits an oxygen-absorbing ability sufficient to ensure the gas barrier properties required in the field of packaging containers, but can effectively suppress yellowing due to oxygen absorption, In particular, it is extremely useful in fields where transparency is required. Furthermore, even when a polyester resin having a high molding temperature, such as PET, is used as the base resin, the excellent oxygen absorbing ability (oxidation property) of the bisimide compound used as the organic oxygen absorbent is not impaired. Therefore, polyester resins such as PET are widely used for the resin composition of the present invention, and are most suitably used in the field of packaging materials that require transparency.
- the resin composition of the present invention is also a packaging material in that it does not accompany the generation of a low molecular weight decomposition product that causes an unpleasant odor during oxygen absorption, thereby preventing oxidative deterioration of the contents and not losing flavor. It is very suitable for the field. Therefore, the oxygen-absorbing resin composition of the present invention is suitably used as a packaging material in the form of a film, sheet, cup, tray, bottle, tube, lid or the like. Moreover, it can also be used for the purpose of absorbing oxygen in a hermetically sealed container in the form of powder, film, sheet or the like.
- the oxygen-absorbing resin composition of the present invention does not involve the by-product of a low molecular weight decomposition product that causes a strange odor during oxygen absorption, when used for molding packaging containers such as bags, cups, bottles, and tubes.
- the layer made of this resin composition can be positioned on the side in contact with the container contents. Therefore, a packaging container can be formed only with the layer which consists of this oxygen absorptive resin composition.
- the oxygen barrier property due to the excellent oxygen absorption of the layer composed of the resin composition can be utilized to reduce the thickness of the container wall, thereby reducing the weight and resources of the container. Cost reduction can be realized.
- the molding into the packaging container as described above may be performed by a publicly known means.
- a film is formed by extrusion molding using the above resin composition, and the obtained film is bonded by heat sealing.
- a bag-like container can be obtained.
- a sheet-like or test-tube preform is formed by extrusion molding, injection molding, etc., and is used for secondary molding such as vacuum molding, stretch molding, pressure forming, plug assist molding, blow stretch molding, etc.
- a cup-shaped, tray-shaped or bottle-shaped packaging container can be obtained.
- a tube-shaped packaging container can be directly formed by extrusion molding, injection molding, direct blow molding, or the like.
- polyester is used as the base resin, a stretch-molded container, and a heat-resistant bottle whose heat resistance is enhanced by heat fixing, etc. Most preferably.
- the oxygen-absorbing resin composition of the present invention can also be made into a multi-layered packaging container in combination with other resins or resin compositions.
- the barrier property against oxygen can be further improved, but also the barrier property against gas other than oxygen (for example, carbon dioxide gas or water vapor) can be enhanced, and further, the oxygen absorption property can be maintained for a long time.
- OAR oxygen-absorbing layer formed using the oxygen-absorbing resin composition of the present invention
- PET polyethylene terephthalate layer
- PE a layer comprising low, medium or high-density polyethylene, linear low-density polyethylene or linear ultra-low-density polyethylene
- PP Layer made of polypropylene
- COC Layer of cyclic olefin resin
- GBAR Gas barrier layer made of aromatic polyamide or ethylene / vinyl alcohol copolymer
- an embodiment including a gas barrier resin layer is suitable for maintaining the oxygen absorption of the oxygen absorption layer (OAR) for a long period of time.
- any side may be formed on the inner surface side or the outer surface side of the container. If the adhesiveness between the layers is insufficient, a layer of an adhesive resin such as an olefin resin modified with an unsaturated carboxylic acid may be interposed as appropriate.
- the oxygen absorption layer (OAR) formed from the oxygen-absorbing resin composition using polyester as the thermoplastic base resin exhibits excellent adhesion to the PET layer, and intervenes a special adhesive resin layer. There is an advantage in that it can be laminated on the PET layer without causing them.
- a packaging container having such a multilayer structure is manufactured by molding in the same manner as in the case of the single-layer structure described above, utilizing multilayering by coextrusion, co-injection, or the like.
- the packaging container provided with the layer containing the oxygen-absorbing resin composition of the present invention exhibits excellent oxygen barrier properties due to its excellent oxygen-absorbing property, beer, Beverages such as wine, fruit juice, carbonated soft drinks, fruits, nuts, vegetables, meat products, infant food, coffee, jam, mayonnaise, ketchup, cooking oil, dressing, sauces, boiled dairy products, dairy products, other pharmaceuticals, It is extremely suitable as a container for filling various contents that deteriorate in the presence of oxygen, such as cosmetics and gasoline. Moreover, since it is excellent also in transparency, it can be suitably used for applications requiring transparency.
- Synthesis Example 2 Synthesis was performed in the same manner as in Synthesis Example 1 except that 250 g of BX, 101 g of metaxylenediamine, and 200 mL of ethanol were used to obtain Compound B2.
- Synthesis Example 3 200 g of BY, 75 g of hexamethylenediamine, 50 mL of toluene (manufactured by Wako Pure Chemical Industries, Ltd.), N-methylpyrrolidone (NMP) in a 1000 mL separable flask equipped with a stirrer, nitrogen inlet tube, and Dean-Stark type water separator 150 mL (made by Wako Pure Chemical Industries, Ltd.) was charged and reacted for about 4 hours while removing water produced at 140 ° C.
- NMP N-methylpyrrolidone
- Synthesis Example 4 Synthesis was performed in the same manner as in Synthesis Example 3 except that 200 g of BY, 80 g of metaxylenediamine, 50 mL of toluene, and 150 mL of NMP were used to obtain Compound B4.
- Oxygen-absorbing resin pellets Using a twin-screw extruder with a granulation facility with a barrel set temperature of 280 ° C (TEM-35B: Toshiba Machine Co., Ltd.), various components are mixed and kneaded into polyester resin A and extruded into a strand. Resin composition pellets were obtained. The components were introduced in a solid pellet form using a powder feeder, and in a liquid form using a liquid feeder (Mono pump: manufactured by Hyojin Equipment Co., Ltd.) so as to be 10% by weight from the opening in the middle of the extruder.
- TEM-35B Toshiba Machine Co., Ltd.
- Examples 1-2, Comparative Examples 1-3 The polyester resin, oxygen-absorbing resin pellets, and transition metal catalyst described in the above materials were dry blended and placed in a hopper of a molding machine, and a 24 g single layer preform for a bottle was molded by injection molding. Next, the molded preform was biaxially stretch blow molded into a 500 mL bottle. Weight ratio and dissolved oxygen concentration in the molded bottle material used, the b * shown in Table 1.
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Abstract
Description
また、特許文献2には、不飽和脂環構造(シクロヘキセン構造)を有する化合物を有機系酸素吸収剤として含む酸素捕集組成物が提案されている。
本発明の他の目的は、上記酸素吸収性樹脂組成物を含む層を有する包装容器を提供することにある。
(A)熱可塑性樹脂からなる基材、
(B)下記式(1):
環Xは、1つの不飽和結合を有する脂肪族環であり、
nは、前記環Xに結合した置換基Yの数を示し、0または1の整
数であり、
Yは、アルキル基である、
で表される酸無水物と脂肪族ジアミンとから誘導されるビスイミド化合物、
及び、
(C)遷移金属触媒
を含み、前記ビスイミド化合物(B)の含有量が0.1~10.0重量%であり、前記遷移金属触媒(C)の含有量が金属換算量で10~350ppmであることを特徴とする酸素吸収性樹脂組成物が提供される。
(1)前記ビスイミド化合物(B)の含有量が1.0~5.0重量%であり、前記遷移金属触媒(C)の含有量が金属換算量で20~100ppmであること、
(2)前記脂肪族ジアミンが非環状構造を有していること、
が好適である。
例えば、後述する実施例及び比較例に示されているように、式(1)の酸無水物を使用したとしても、これに芳香族ジアミンを反応させて得られるビスイミドが配合されている樹脂組成物では、これを用いて成形されたボトルは、酸素吸収量の増加とともに、L*、a*、b*表色系でのb*値が大きく上昇しており、黄色度が高まっていることが認められるが(比較例3)、式(1)の酸無水物に脂肪族ジアミンを反応させて得られるビスイミドが配合されている本発明の樹脂組成物では、これを用いたボトルの酸素吸収に伴うb*値の変動はかなり小さく、酸素吸収に伴う黄変が有効に抑制されていることが判る。
本発明の酸素吸収性樹脂組成物において、基材樹脂は、以下に述べる(B)有機系酸素吸収剤や(C)遷移金属触媒を分散させるためのマトリックスとして機能するものである。基材樹脂としては、成形性などの観点から熱可塑性樹脂が使用される。
オレフィン系樹脂、例えば、低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、ポリ1-ブテン、ポリ4-メチル-1-ペンテンあるいはエチレン、プロピレン、1-ブテン、4-メチル-1-ペンテン等のα-オレフィン同士のランダムあるいはブロック共重合体、環状オレフィン共重合体など;
エチレン・ビニル系共重合体、例えば、エチレン・酢酸ビニル共重合体、エチレン・ビニルアルコール共重合体、エチレン・塩化ビニル共重合体等;
スチレン系樹脂、例えば、ポリスチレン、アクリロニトリル・スチレン共重合体、ABS、α-メチルスチレン・スチレン共重合体等;
ビニル系樹脂、例えば、ポリ塩化ビニル、ポリ塩化ビニリデン、塩化ビニル・塩化ビニリデン共重合体、ポリアクリル酸メチル、ポリメタクリル酸メチル等;
ポリアミド樹脂、例えば、ナイロン6、ナイロン6-6、ナイロン6/6-6共重合体、ポリメタキシリレンジアジパミド、ナイロン6-10、ナイロン11、ナイロン12、ナイロン13等;
ポリエステル樹脂、例えば、ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート、ポリエチレンナフタレート、及びこれらの共重合ポリエステル等;
ポリカーボネート樹脂;
ポリフエニレンオキサイド樹脂;
生分解性樹脂、例えば、ポリ乳酸など;
勿論、成形性が損なわれない限り、これらの熱可塑性樹脂のブレンド物を基材樹脂として使用することもできる。
このような共重合ポリエステルにおいて、テレフタル酸以外の二塩基酸としては、イソフタル酸、フタル酸、ナフタレンジカルボン酸等の芳香族ジカルボン酸;シクロヘキサンジカルボン酸等の脂環族ジカルボン酸;コハク酸、アジピン酸、セバチン酸、ドデカンジオン酸等の脂肪族ジカルボン酸;などの1種又は2種以上の組み合わせを例示することができる。
また、エチレングリコール以外のジオール成分としては、プロピレングリコール、1,4-ブタンジオール、ジエチレングリコール、1,6-ヘキシレングリコール、シクロヘキサンジメタノール、ビスフェノールAのエチレンオキサイド付加物等の1種又は2種以上が挙げられる。
また、ポリアミド樹脂以外のガスバリア性樹脂としては、エチレン-ビニルアルコール共重合体が代表的である。例えば、エチレン含有量が20~60モル%、特に25~50モル%のエチレン-酢酸ビニル共重合体を、ケン化度が96%以上、特に99モル%以上となるようにケン化して得られる共重合体ケン化物が好適に使用される。
上記のようなガスバリア性樹脂は、フィルムを形成し得る程度の分子量を有していればよい。
本発明において、酸素を吸収する有機系酸素吸収剤(B)としては、下記式(1):
環Xは、1つの不飽和結合を有する脂肪族環であり、
nは、前記環Xに結合した置換基Yの数を示し、0または1の整数
であり、
Yは、アルキル基である、
で表される酸無水物と脂肪族ジアミンとから誘導されるビスイミド化合物が使用される。このビスイミド化合物は、分子中の不飽和環内の不飽和結合の部分が容易に酸化され、これにより、酸素が吸収され、酸素吸収性が発揮される。例えば芳香族環内の不飽和結合は、このような被酸化性は示さない。
従って、例えば、この酸素吸収性樹脂組成物を用いて容器を成形するとき、この組成物からなる層を容器内容物と接触する側に配置することができるし、さらには、この組成物からなる層のみで(即ち単層構造)で容器を成形することができる。特に単層構造の容器としたときは、この層が優れた酸素吸収性により良好な酸素バリア性を示すため、容器壁の薄肉化が可能となり、容器の軽量化や省資源などの観点から極めて有利となる。
式中、Zは、メチレン基またはエチレン基である、
で表されるビシクロ環構造を含むものが挙げられる。このような多環は、橋絡基Zが結合している環内炭素原子が3級炭素原子となっており、この3級炭素原子も酸化され易くなっている。そのため、酸化による酸素吸収性がより高められている。
-ヘキサデセン
ヘキサデセン
環Xがシクロヘキセン環であるとき;
酸無水物基の結合炭素原子が1位及び2位であり、不飽和結合が3位
或いは4位。
環Xがビシクロ[2.2.1]ヘプト-2-エンであるとき;
2位の不飽和結合に対して、酸無水物基の結合炭素原子が5位及び6
位。
環Xがトリシクロ[4.4.0.12.5]-3-ウンデセンであるとき;
3位の不飽和結合に対して、酸無水物基の結合炭素原子が8位及び9
位。
環Xがテトラシクロ[4.4.0.12.5.17.10]-3-ドデセンであるとき;
3位の不飽和結合に対して、酸無水物基の結合炭素原子が8位及び9
位。
環Xがペンタシクロ[8.4.0.12.5.19.12.08.13]-3-ヘキサデセンであるとき;
3位の不飽和結合に対して、酸無水物基の結合炭素原子が10位及び
11位。
環Xがペンタシクロ[6.6.1.13.6.02.7.09.14]-4-ヘキサデセンであるとき;
4位の不飽和結合に対して、酸無水物基の結合炭素原子が11位及び
12位。
本発明において、上記式(1)の酸無水物の最も好適な例としては、下記式(2)で表される3-メチル-Δ4-テトラヒドロフタル酸無水物、及び下記式(3)で表される4-メチル-Δ3-テトラヒドロフタル酸無水物を挙げることができる。
中間生成物のアミド;
HOOC-X-CONH-R-CONH-X-COOH
式中、
Xは、式(1)の酸無水物が有する不飽和脂肪族環であり、
Rは、反応に用いたジアミンに由来する脂肪族基である、
最終生成物のビスアミド;
X-(CO)2-N-R-N-(CO)2-X
式中、X及びRは、上記と同じである。
この量が上記範囲よりも少ないと、酸素吸収性が不満足となり、また、上記範囲よりも多量に使用すると、酸素吸収による黄変傾向が顕著となる。
本発明において遷移金属触媒は、上記のビスイミド化合物(B)の酸化を促進させ、その酸素吸収能を高めるために使用されるものであり、有機系酸素吸収剤との組み合わせに常用されているものである。
上述した(A)~(C)成分を必須成分として含む本発明の酸素吸収性樹脂組成物においては、その黄変抑制能や酸素吸収性、成形性等の特性を損なわない範囲で、種々の配合剤、例えば充填剤、着色剤、耐熱安定剤、耐候安定剤、酸化防止剤、老化防止剤、光安定剤、紫外線吸収剤、帯電防止剤、金属石鹸やワックス等の滑剤、改質用樹脂乃至ゴム等を適宜の量で配合することもできる。
上述した本発明の酸素吸収性樹脂組成物は、一般的には、前述した各成分を、非酸化性雰囲気中で押出機等を用いて混練することにより調製されるが、一部の成分を予め混合しておき、残りの成分を後から混合する等の手段も採用することができる。
例えば、熱可塑性基材樹脂(A)の一部と、酸素吸収剤(B)及び適宜配合される他の配合剤とを二軸押出機を用いて脱気しながら溶融混練してマスターバッチペレットを調製しておき、使用直前に、残りの熱可塑性基材樹脂(A)を混練して成形に供することもできる。この場合、マスターバッチの調製に用いられる熱可塑性樹脂と後から混練する熱可塑性樹脂とが異なる物性を有するものであってもよい。このような手段を採用することにより、用途に応じて物性を調整することができる。
また、遷移金属触媒(C)に関しては、遷移金属触媒(C)を均質に配合するため、遷移金属触媒を適当な有機溶媒(例えばアルコール系、エーテル系、ケトン系、炭化水素系等の有機溶媒)に溶解させた溶液を調製し、この溶液を、押出機等の混練機中で他の成分と混合することが好適である。
さらに、PET等の成形温度の高いポリエステル樹脂を基材樹脂として使用した場合にも、有機系酸素吸収剤として用いるビスイミド化合物の優れた酸素吸収能(被酸化性)は損なわれない。従って、本発明の樹脂組成物は、PET等のポリエステル樹脂が汎用されており、透明性が要求される包装材料の分野で最も好適に使用される。
また、酸素吸収に際して、異臭の原因となる低分子量分解物の副生を伴わないため、内容物の酸化劣化を防止し且つフレーバーを損なわないという点でも、本発明の樹脂組成物は、包装材の分野に極めて好適である。
従って、本発明の酸素吸収性樹脂組成物は、例えばフィルム、シート、カップ、トレイ、ボトル、チューブ或いは蓋体等の形態で包装材として好適に使用される。また、粉末、フィルム、シート等の形態で密封包装容器内の酸素を吸収する目的で使用することもできる。
このような単層構造の包装容器では、上記樹脂組成物からなる層の優れた酸素吸収による酸素バリア性を活かして、その容器壁を薄肉化することができ、容器の軽量化や省資源化、低コスト化を実現できる。
さらに、有機系酸素吸収剤として用いるビスイミド化合物が耐熱性に優れていることから、基材樹脂としてポリエステルを使用し、延伸成形容器、さらには熱固定等により耐熱性が高められた耐熱ボトルなどとするのが最も好適である。
OAR:本発明の酸素吸収性樹脂組成物を用いて形成された酸素吸収層
PET:ポリエチレンテレフタレート層
PE:低、中或いは高密度ポリエチレン、直鎖低密度ポリエチレンまたは
線状超低密度ポリエチレンからなる層
PP:ポリプロピレンからなる層
COC:環状オレフィン樹脂の層
GBAR:芳香族ポリアミド或いはエチレン・ビニルアルコール共重合体
からなるガスバリア層
PET/OAR
三層構造の例;
PE/OAR/PET
PET/OAR/PET
GBAR/OAR/PET
PE/OAR/COC
四層構造;
PE/PET/OAR/PET
PE/OAR/GBAR/PET
PET/OAR/GBAR/PET
PE/OAR/GBAR/COC
PE/OAR/GBAR/PE
五層構造;
PET/OAR/PET/OAR/PET
PE/PET/OAR/GBAR/PET
PET/OAR/GBAR/COC/PET
PET/OAR/PET/COC/PET
PE/OAR/GBAR/COC/PET
PE/GBAR/OAR/GBAR/PE
PP/GBAR/OAR/GBAR/PP
六層構造;
PET/OAR/PET/OAR/GBAR/PET
PE/PET/OAR/COC/GBAR/PET
PET/OAR/GBAR/PET/COC/PET
PE/GBAR/OAR/PE/GBAR/PE
PP/GBAR/OAR/PP/GBAR/PP
七層構造;
PET/OAR/COC/PET/GBAR/OAR/PET
上記の多層構造では、何れの側が容器の内面側或いは外面側に形成されていてもよい。
各層の間の接着性が不十分な場合には、適宜、不飽和カルボン酸で変性されたオレフィン系樹脂などの接着剤樹脂の層を間に介在させることも可能である。尚、熱可塑性基材樹脂としてポリエステルを用いた酸素吸収性樹脂組成物から形成される酸素吸収層(OAR)は、PET層に対して優れた接着性を示し、格別の接着剤樹脂層を介在させることなくPET層に積層させることができるという利点がある。
このような多層構造の包装容器は、共押出や共射出等による多層化を利用して、前述した単層構造の場合と同様にして成形を行うことにより製造される。
また、透明性にも優れているため、透明性の要求される用途にも好適に使用できる。
<ポリエステル樹脂(A)>
イソフタル酸(共重合比率=1.8mol%)共重合ポリエチレンテレフタレート樹脂(5015w:新光合繊製、IV=0.83)
<酸素吸収成分原料(BX)>
4-メチル-Δ3-テトラヒドロ無水フタル酸を45重量%およびcis-3-メチル-Δ4-テトラヒドロ無水フタル酸を21重量%含有するメチルテトラヒドロ無水フタル酸混合物(HN-2200:日立化成製)を酸素吸収成分の原料(酸無水物)とした。
<酸素吸収成分原料(BY)>
cis-4-シクロヘキセン-1,2-ジカルボン酸無水物(東京化成工業製)を酸素吸収成分の原料(酸無水物)とした。
<遷移金属触媒(C)>
ネオデカン酸コバルト(DICNATE5000:大日本インキ化学工業製)
(合成例1)
攪拌装置、窒素導入管、滴下漏斗を備えた1000mLの4ツ口のセパラブルフラスコに酸素吸収成分原料(酸無水物)としてBX250gを仕込んだ。ここへエタノール200mLに溶解させたアミン成分;ヘキサメチレンジアミン(東京化成工業製)87.1gを徐々に加えた。全量投入後、窒素雰囲気下120~180℃で、生成する水を取り除きながら約5時間反応させることにより酸素吸収成分B1を得た。
(合成例2)
BXを250g、メタキシレンジアミンを101g、エタノールを200mL使用した点以外は、合成例1と同様に合成を行い、化合物B2を得た。
(合成例3)
攪拌装置、窒素導入管、Dean-Stark型水分離器を備えた1000mLのセパラブルフラスコにBYを200g、ヘキサメチレンジアミンを75g、トルエン(和光純薬製)を50mL、N-メチルピロリドン(NMP)(和光純薬製)を150mL仕込み、窒素雰囲気中140℃で生成する水を取り除きながら約4時間反応させた。反応液に2-プロパノールを500mL加え、得られたスラリーを吸引ろ過し2-プロパノール100mLで洗浄した。その後40℃で12時間真空乾燥することで化合物B3を得た。
(合成例4)
BYを200g、メタキシレンジアミンを80g、トルエンを50mL、NMPを150mL使用した点以外は、合成例3と同様に合成を行い、化合物B4を得た。
バレル設定温度を280℃とした造粒設備付帯二軸押出機{TEM-35B:東芝機械(株)}を用い、ポリエステル樹脂Aに各種構成成分を混合混練しストランド状に押出し、樹脂組成ペレットを得た。
構成成分の導入方法は、固体ペレット状のものは紛体フィーダーにより、液状のものは液体フィーダー(モーノポンプ:兵神装備製)により押出機中途の開口部より10重量%になるように添加した。
(1)溶存酸素濃度
無酸素水製造器(LOW DISSOLVED OXYGEN:三浦工業(株)製)でほぼ酸素濃度が0である無酸素水を作成し、これを成形したボトルに満注充填し、プラスチックキャップで密封した。23℃50%RHの恒温恒湿室に2ヶ月間保管した後のボトル内水中溶存酸素濃度を水中溶存酸素濃度計(oxygen indicater:orbisphere laboratories製)で測定した。
(2)ボトル胴部b*値の測定
成形直後のボトル及び溶存酸素を測定したボトルの胴部を切り出し、カラーコンピュータ{SM-4:スガ試験器(株)}を用いてb*を測定した。
Claims (4)
- 前記ビスイミド化合物(B)の含有量が1.0~5.0重量%であり、前記遷移金属触媒(C)の含有量が金属換算量で20~100ppmである請求項1に記載の酸素吸収性樹脂組成物。
- 前記脂肪族ジアミンが非環状構造を有している請求項1に記載の酸素吸収性樹脂組成物。
- 請求項1に記載の酸素吸収性樹脂組成物を含む層を有している包装容器。
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JPWO2018062429A1 (ja) * | 2016-09-28 | 2019-07-11 | 東洋製罐グループホールディングス株式会社 | ガスバリア性に優れた成形体 |
EP3521344A4 (en) * | 2016-09-28 | 2020-06-03 | Toyo Seikan Group Holdings, Ltd. | MOLDED BODY HAVING EXCELLENT GAS BARRIER PROPERTIES |
CN109790303B (zh) * | 2016-09-28 | 2021-12-24 | 东洋制罐集团控股株式会社 | 阻气性优异的成形体 |
Also Published As
Publication number | Publication date |
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EP3118262A1 (en) | 2017-01-18 |
US20170066903A1 (en) | 2017-03-09 |
CN106103595A (zh) | 2016-11-09 |
KR20160127788A (ko) | 2016-11-04 |
JP2015174895A (ja) | 2015-10-05 |
EP3118262A4 (en) | 2017-10-04 |
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