WO2019230929A1 - Récipient en plastique multicouche comprenant un copolymère d'éthylène-alcool vinylique - Google Patents

Récipient en plastique multicouche comprenant un copolymère d'éthylène-alcool vinylique Download PDF

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Publication number
WO2019230929A1
WO2019230929A1 PCT/JP2019/021658 JP2019021658W WO2019230929A1 WO 2019230929 A1 WO2019230929 A1 WO 2019230929A1 JP 2019021658 W JP2019021658 W JP 2019021658W WO 2019230929 A1 WO2019230929 A1 WO 2019230929A1
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Prior art keywords
oxygen barrier
layer
ethylene
vinyl alcohol
alcohol copolymer
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PCT/JP2019/021658
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English (en)
Japanese (ja)
Inventor
雄介 安齋
小松　威久男
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メビウスパッケージング株式会社
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Priority to JP2020522616A priority Critical patent/JP7311503B2/ja
Publication of WO2019230929A1 publication Critical patent/WO2019230929A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes

Definitions

  • the present invention relates to a multilayer plastic container having an oxygen barrier layer made of an ethylene / vinyl alcohol copolymer as an intermediate layer, and further to oxygen used as an adhesive for forming the multilayer structure of the plastic container. Also related to barrier reinforcement.
  • Olefin resins such as polyethylene and polypropylene are excellent in properties such as moldability, transparency, mechanical strength, and chemical resistance, and are particularly used as packaging materials for bottles and the like.
  • the barrier property against oxygen is enhanced by providing a multilayer structure in which an oxygen barrier layer is provided in the intermediate layer.
  • the resin used for forming the oxygen barrier layer is typically an ethylene / vinyl alcohol copolymer (saponified ethylene-vinyl acetate copolymer).
  • the ethylene / vinyl alcohol copolymer (EVOH) has a low resistance to moisture, and has a drawback that, for example, under a high humidity condition, the oxygen barrier property is greatly reduced.
  • the oxygen barrier layer made of EVOH is used as a multilayer structure sandwiched by a low hygroscopic resin layer such as an olefin resin as disclosed in Patent Document 1 and the like. Even in this case, deterioration of EVOH due to moisture cannot be sufficiently prevented. In particular, when the contents stored in the container are edible liquid substances such as beverages, this tendency is remarkable. In addition, EVOH has a problem of poor adhesion to olefinic resins. For this reason, in the multilayer structure described above, the oxygen barrier layer of EVOH has a layer structure bonded to the olefin resin layer using an adhesive layer.
  • Examples of the adhesive used for the adhesive layer as described above include, for example, Patent Document 1, an ethylene-acrylic acid copolymer, an ion-crosslinked olefin copolymer (ionomer), a maleic anhydride grafted polyolefin, an acrylic acid grafted polyolefin, Examples include ethylene-vinyl acetate copolymer.
  • burrs are generated when a container is formed by blow molding, and punching scraps are generated by cup molding.
  • Such scrap is generally mixed with a virgin resin to be reused as a regrind layer and as an intermediate layer of a multilayer container.
  • the regrind layer containing scrap generated when molding a container including an oxygen barrier layer of an ethylene / vinyl alcohol copolymer contains a large amount of olefin resin used for inner and outer layer resins. It has poor adhesion. Therefore, when such a regrind layer is provided, it is necessary to use the adhesive layer as described above between the virgin EVOH layer.
  • EVOH is contained in this regrind layer, it has received a thermal history and further dispersed in the layer, so it does not have sufficient oxygen barrier properties. Therefore, by providing the regrind layer, it is impossible to avoid a decrease in oxygen barrier property due to moisture.
  • an object of the present invention includes an inner and outer layer of an olefin resin and an oxygen barrier layer of an ethylene / vinyl alcohol copolymer provided as an intermediate layer, and a decrease in oxygen barrier property due to moisture is effectively avoided. It is to provide a multilayer plastic container. Another object of the present invention is to prevent deterioration of oxygen barrier properties due to moisture, and at the same time, improve the adhesion between the regrind layer and the ethylene / vinyl alcohol copolymer, and provide a regrind layer. Another object of the present invention is to provide a multi-layer plastic container in which exfoliation of the ethylene / vinyl alcohol copolymer is effectively prevented.
  • Still another object of the present invention is to provide an oxygen barrier that can effectively mitigate a decrease in oxygen barrier properties of an ethylene / vinyl alcohol copolymer due to moisture while being used as an adhesive with an ethylene / vinyl alcohol copolymer layer. It is to provide a reinforcing material.
  • the inventors of the present invention conducted a number of experiments on the adhesion of ethylene / vinyl alcohol copolymer and reduced oxygen barrier properties due to moisture, and as a result, ethylene / vinyl alcohol copolymer, low-density polyethylene, compatibilizer, In order to complete the present invention, it has been found that the composition blended with the composition exhibits not only high oxygen barrier properties by itself, but also excellent adhesion to olefin resin layers and regrind layers. It came.
  • a multilayer plastic container including an inner and outer layer made of an olefin resin and an oxygen barrier layer made of an ethylene / vinyl alcohol copolymer as an intermediate layer, An oxygen barrier reinforcing layer containing ethylene-vinyl alcohol copolymer and low-density polyethylene as main materials and further containing a compatibilizing agent is provided adjacent to at least the inner surface of the oxygen barrier layer.
  • a multilayer plastic container is provided.
  • the oxygen barrier reinforcing layer is provided adjacent to the container outer surface side of the oxygen barrier layer.
  • At least one regrind layer containing scrap generated during molding of a container containing ethylene / vinyl alcohol as an oxygen barrier resin is provided as an intermediate layer.
  • the oxygen barrier reinforcing layer is located between the regrind layer and the oxygen barrier layer.
  • the hygroscopic material is an ethylene / vinyl alcohol copolymer.
  • An ionomer is used as the compatibilizing agent.
  • the oxygen barrier reinforcing layer contains the ethylene / vinyl alcohol copolymer and the low-density polyethylene in a mass ratio of 95: 5 to 50:50.
  • the oxygen barrier reinforcing layer contains the compatibilizing agent in an amount of 1 to 49 parts by mass per 100 parts by mass of the total amount of the ethylene / vinyl alcohol copolymer and the low density polyethylene.
  • the ethylene / vinyl alcohol copolymer forming the oxygen barrier layer and the ethylene / vinyl alcohol copolymer used in the oxygen barrier reinforcing layer have an ethylene content of 20 to 60 mol%. Be in the range.
  • the oxygen barrier layer is present with a peel strength of 100 mN / 15 mm or more.
  • the body thickness is in the range of 10 to 1500 ⁇ m and the oxygen permeability is 100 cc / m 2 ⁇ day ⁇ atm or less.
  • (11) A direct blow bottle.
  • the oxygen barrier reinforcing material further comprising an ethylene / vinyl alcohol copolymer and low-density polyethylene as main materials, and further containing a compatibilizer, wherein the melt flow rate at 190 ° C. of the low-density polyethylene is An oxygen barrier reinforcing material characterized by being 0.3 to 30 g / 10 min is provided.
  • the ethylene / vinyl alcohol copolymer and the low density polyethylene are contained in a mass ratio of 95: 5 to 50:50, and the compatibilizing agent is an ethylene / vinyl alcohol copolymer and a low density polyethylene. It is included in an amount of 1 to 49 parts by mass per 100 parts by mass in total.
  • the compatibilizing agent is an ethylene / vinyl alcohol copolymer and a low density polyethylene. It is included in an amount of 1 to 49 parts by mass per 100 parts by mass in total.
  • the low density polyethylene has a melt flow rate at 190 ° C. of 1.0 to 20 g / 10 min.
  • An ionomer is used as the compatibilizer, Is preferred.
  • the multilayer plastic container of the present invention includes an oxygen barrier layer made of ethylene / vinyl alcohol copolymer (EVOH) as an intermediate layer together with inner and outer layers made of olefin resin, and is adjacent to the inner surface side of the oxygen barrier layer.
  • EVOH ethylene / vinyl alcohol copolymer
  • the oxygen barrier reinforcing layer includes a hygroscopic material and low density polyethylene (LDPE) as main materials, and is further formed of an oxygen barrier reinforcing material containing a compatibilizing agent.
  • Such an oxygen barrier reinforcing layer contains a large amount of a hygroscopic material as a main material.
  • a hygroscopic material for example, a substance containing a large amount of water such as a beverage or a seasoning liquid as a container content.
  • the hygroscopic material in the oxygen barrier reinforcing layer absorbs moisture, and effectively suppresses the decrease in oxygen barrier properties due to moisture in the adjacent oxygen barrier layer (EVOH layer). Sex can be reinforced.
  • LDPE and compatibilizing agent are also homogeneously distributed in the oxygen barrier reinforcing layer described above. Therefore, it has excellent adhesion to EVOH gas barrier layers and olefin resin layers.
  • this oxygen barrier reinforcing material when this oxygen barrier reinforcing material is provided as an adhesive layer adjacent to the oxygen barrier layer of EVOH, the peel strength of the oxygen barrier layer is 100 mN / 15 mm or more. It becomes. Therefore, in the present invention, it is possible to effectively avoid peeling of the oxygen barrier layer and the regrind layer without forming a special adhesive resin layer, and to change the die head of the extruder by forming the adhesive resin layer, etc.
  • the oxygen barrier property can be enhanced while avoiding the cost increase derived from the above.
  • the multilayer plastic container of the present invention has inner and outer layers formed of an olefin resin, and includes an oxygen barrier layer made of ethylene / vinyl alcohol copolymer (EVOH) as an intermediate layer, and further includes at least an oxygen barrier layer.
  • An oxygen barrier reinforcing layer is provided adjacent to the inner surface side, and a regrind layer is provided as necessary.
  • olefin resin used as the inner and outer layers low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), linear ultra-low Polyethylene such as density polyethylene (LVLDPE), polypropylene, ethylene-propylene copolymer, polybutene-1, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene-1 copolymer Examples thereof include a copolymer, an ethylene-vinyl acetate copolymer, and an ion-crosslinked olefin copolymer (ionomer). Among these, polyethylene is most suitable because it has high adhesiveness with an oxygen barrier reinforcing layer described later.
  • the olefin-based resin for forming the inner and outer layers as described above may be of an extrusion grade or an injection grade conventionally used in the field of packaging materials.
  • the thickness of the inner and outer layers as described above is not particularly limited, and is appropriately set according to the application utilizing the characteristics of the olefin resin used for the inner and outer layers, but in general, the total thickness of each layer About 10 to 50% of the total thickness of a certain multilayer structure is set to be the total thickness of the inner layer and the outer layer.
  • a lubricant in the inner and outer layers, a lubricant, a modifier, a pigment, an ultraviolet absorber and the like may be blended as necessary.
  • ethylene-vinyl alcohol copolymer (EVOH) used for forming the oxygen barrier layer specifically, an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol% is used.
  • This ethylene-vinyl alcohol copolymer (saponified ethylene-vinyl acetate copolymer) is generally 0.01 dl / g or more measured at 30 ° C. in a mixed solvent having a phenol / water mass ratio of 85/15. In particular, it has an intrinsic viscosity of 0.05 dl / g or more.
  • the above-mentioned EVOH has a higher oxygen barrier property as the ethylene content is smaller.
  • the oxygen barrier reinforcement layer mentioned later shows high adhesiveness with respect to EVOH. Therefore, in the present invention, it is desirable to use EVOH having a low ethylene content. For example, those having an ethylene content in the range of 20 to 60 mol% are used, but high barrier properties in the range of 20 to 38 mol% are used. It is further preferred to use EVOH.
  • Such an oxygen barrier layer formed of EVOH is not limited to one layer, and may be provided in two or more layers. In particular, it is preferable to provide a plurality of oxygen barrier layers in terms of ensuring oxygen barrier properties at a certain level or higher.
  • the thickness of the oxygen barrier layer is set to an appropriate thickness according to the number of oxygen barrier layers provided in the multilayer structure and the required oxygen barrier property provided in the container.
  • an oxygen barrier reinforcing layer is provided adjacent to at least the inner surface side of the oxygen barrier layer.
  • Such an oxygen barrier reinforcing layer includes a hygroscopic material and low density polyethylene (LDPE) as main materials, and further includes an oxygen barrier reinforcing material including a compatibilizing agent.
  • the low density polyethylene in the present application includes linear low density polyethylene.
  • the hygroscopic material include an ethylene / vinyl alcohol copolymer (EVOH) and a polyamide resin. These materials can be blended alone in the oxygen barrier layer.
  • hygroscopic materials include polysaccharides such as starch and cellulose; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; poly ⁇ and ⁇ unsaturated carboxylic acids such as polyacrylic acid or sodium polyacrylate or ionic cross-linked products thereof. ; Polyalkylene oxide derivatives such as polyethylene oxide or polypropylene oxide; Organic compounds having hydrophilic groups such as polyester; Zeolite, silica gel, activated carbon, activated clay, activated aluminum oxide, clay, kaolin, talc, bentonite, sepiolite, aluminum silicate, oxidation Mention may also be made of inorganic compounds such as calcium, calcium chloride and magnesium sulfate. These materials are blended in EVOH and then blended into the oxygen barrier reinforcing layer. This is to ensure adhesion with the oxygen barrier layer made of EVOH.
  • Such an oxygen barrier reinforcing layer has a hygroscopic material and LDPE compatibilized by a compatibilizing agent and is homogeneously distributed. Excellent adhesiveness is exhibited. Furthermore, moisture entering from the container is absorbed by the hygroscopic material in the oxygen barrier reinforcing layer, and as a result, deterioration of the oxygen barrier layer (EVOH layer) adjacent to the oxygen barrier reinforcing layer is effectively mitigated. Thus, it is possible to effectively suppress a decrease in oxygen barrier property due to moisture, and to maintain a certain level of oxygen barrier property.
  • the hygroscopic material used as the main material in the oxygen barrier reinforcing material the same material as that used for forming the oxygen barrier layer described above may be used.
  • those having the ethylene content in the range of 20 to 60 mol% are used, and high barrier EVOH in the range of 20 to 38 mol% is more preferably used.
  • the LDPE used as the other main material in the oxygen barrier reinforcing material is polyethylene having a density in the range of 0.910 g / cm 3 or more and less than 0.930 g / cm 3 .
  • EVOH is used as the hygroscopic material
  • such LDPE generally has a melt flow rate at 190 ° C. (from the viewpoint of avoiding phase separation with EVOH during molding and preventing delamination).
  • the MFR) is preferably 0.3 g / 10 min or more, 30 g / 10 min or less, particularly 1.0 to 20 g / 10 min from the viewpoint of moldability.
  • the compatibilizing agent in the oxygen barrier reinforcing layer is used for compatibilizing EVOH and LDPE having poor adhesion to each other and preventing phase separation between them.
  • carboxylic acid such as maleic acid, itaconic acid, fumaric acid or its anhydride, maleic acid-polyethylene copolymer, maleic anhydride-polyethylene copolymer, amide, ester, etc.
  • Graft-modified olefin resin ethylene- (meth) acrylic acid copolymer; ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer having a saponification degree of 20 to 100%, ethylene content of 85% or more
  • examples thereof include ethylene-vinyl alcohol copolymer, hydrotalcite compound; ionomer (ion-crosslinked olefin copolymer).
  • ionomers are particularly preferably used.
  • the compatibilizer such as ionomer is preferably used in an amount of 1 to 49 parts by mass, particularly 5 to 30 parts by mass, per 100 parts by mass of the total amount of the main materials (EVOH and LDPE). If the compatibilizing agent is used in excess, not only the properties required for EVOH and LDPE used as the main material are impaired, but the cost is increased and there is no merit. Moreover, when there is too little usage-amount of a compatibilizing agent, EVOH and LDPE will isolate
  • the oxygen barrier reinforcing layer formed from the above-described oxygen barrier reinforcing material is provided adjacent to at least the inner surface side of the above-described oxygen barrier layer. That is, since the oxygen barrier reinforcing material layer exhibits excellent adhesion to the oxygen barrier layer and the inner layer of the olein resin, it is possible to effectively prevent delamination of the oxygen barrier layer. Further, since this oxygen barrier reinforcing material layer contains EVOH, it reinforces the oxygen barrier property. However, by providing the oxygen barrier reinforcing material layer on the inner surface side of the oxygen barrier layer, it absorbs moisture contained in the container contents, Deterioration due to moisture of EVOH forming the layer can be effectively suppressed.
  • the above oxygen barrier reinforcing material can be easily prepared by, for example, melt-kneading in a kneading part provided in an extruder or an injection machine.
  • the layer made of the above-mentioned oxygen barrier reinforcing material is usually formed with a thickness of 1 ⁇ m or more, particularly about 5 to 30 ⁇ m, to improve adhesion with the oxygen barrier layer (or a regrind layer described later).
  • the oxygen barrier layer or a regrind layer described later.
  • Such an oxygen barrier reinforcing material layer is not limited to a single layer but can be provided with a plurality of layers, provided that it is provided adjacent to at least the inner surface side of the oxygen barrier layer.
  • the oxygen barrier reinforcing material layer also functions as an adhesive layer with respect to the oxygen barrier layer, it is generally preferable that the oxygen barrier reinforcing material layer is also provided on the outer surface side of the oxygen barrier layer.
  • the multilayer plastic container of the present invention can be provided with a regrind layer, thereby enabling reuse of scrap. Can do.
  • Scraps can be used alone, but scraps such as burrs and punching scraps generated during the molding of containers have undergone a thermal history, and various physical properties have deteriorated. It is mixed with the virgin olefin resin used for forming and reused as a regrind layer.
  • the regrind layer may contain virgin olefin resin at a rate of 1% by mass or more of scrap. preferable.
  • the scrap generated by container molding can be directly mixed with a virgin olefin resin and applied to the formation of a regrind layer without performing, for example, a drying process for removing water.
  • Such a regrind layer is not limited to a single layer, but a plurality of regrind layers can be provided.
  • the total thickness of the regrind layer is the thickness of the container wall (total thickness of each layer).
  • the thickness of one regrind layer is preferably set to about 9 to 1350 ⁇ m.
  • the multilayer plastic container of the present invention having the inner and outer layers, the oxygen barrier layer, and the oxygen barrier reinforcing layer described above is provided that the oxygen barrier reinforcing layer is provided adjacent to the inner surface side of the oxygen barrier layer (EVOH layer).
  • EVOH layer oxygen barrier layer
  • Various layer configurations such as providing a regrind layer can be employed. Although such a layer structure is not limited to this, when the example is given, it is as follows.
  • the inner and outer olefin resin layers were abbreviated as PO, the oxygen barrier layer as EVOH, the regrind layer as RG, and the oxygen barrier reinforcing layer as ROB.
  • the peel strength of the EVOH layer is 100 mN / 15 mm or more, particularly 100 It can be ⁇ 900 mN / 15 mm.
  • the thickness of the container body having a multilayer structure is in the range of 10 to 1500 ⁇ m, and is 100 cc / m 2 ⁇ day ⁇ atm or less The oxygen permeability can be expressed.
  • the above-mentioned multilayer plastic container forms a tube-shaped or sheet-shaped preform by extrusion molding or injection molding using the resin or resin composition forming each layer, and then known as blow molding or plug assist molding.
  • a bottle or cup-shaped container is formed and used.
  • the oxygen barrier reinforcing material used in the present invention exhibits a high oxygen barrier property by itself and an excellent adhesiveness to EVOH and olefin-based resins. Therefore, in particular, an oxygen barrier layer (EVOH layer) and an olefin It can be suitably used for adhesion to a regrind layer containing a resin.
  • Oxygen permeability (cc / m 2 ⁇ day ⁇ atm) (V ⁇ (Cg / 100)) / (A ⁇ 0.209 ⁇ t)
  • V Inert gas filling amount (cc)
  • Cg Oxygen permeation amount (vol%)
  • oxygen permeability was evaluated according to the following criteria, based on Reference Example 1 in which a normal adhesive layer (maleic anhydride-modified polyethylene layer) was provided instead of the oxygen barrier reinforcing layer.
  • a normal adhesive layer maleic anhydride-modified polyethylene layer
  • Oxygen permeability is 3 cc / m 2 ⁇ day ⁇ atm as compared to Reference Example 1.
  • Smaller than + Oxygen permeability is 0.3 cc / m 2 ⁇ day ⁇ compared to Reference Example 1. atm or more but less than 3 cc / m 2 ⁇ day ⁇ atm small
  • EVOH-A Ethylene / vinyl alcohol copolymer Nihon Gosei Co., Ltd.
  • EVOH-B Ethylene / vinyl alcohol copolymer Kuraray Co., Ltd.
  • LDPE-A Low density polyethylene G801 manufactured by Sumitomo Chemical Co., Ltd. (Density 0.921 g / cm 3 , MFR 20 g / 10 min)
  • LDPE-B Low density polyethylene F218-0 manufactured by Sumitomo Chemical Co., Ltd.
  • LDPE-C Low density polyethylene LB420M manufactured by Nippon Polyethylene (Density 0.928 g / cm 3 , MFR 0.7 g / 10 min)
  • LDPE-D Low density polyethylene F101-1 manufactured by Sumitomo Chemical Co., Ltd. (Density 0.928 g / cm 3 , MFR 0.3 g / 10 min)
  • Compatibilizer-A High Milan 1601 manufactured by Mitsui DuPont Polychemical Co., Ltd.
  • Compatibilizer-B Nippon Polyethylene ET220X Regrind layer: 50 parts by mass of scrap when the container of Reference Example 1 was made, and the same material 5 as the low-density polyethylene used for the inner and outer layers What dry-blended 0 mass part was used.
  • Adhesive layer Maleic anhydride-modified polyethylene L522 manufactured by Mitsubishi Chemical Corporation
  • Example 2 A container was prepared in the same manner as in Experimental Example 1 except that the mass ratio of EVOH to LDPE of the oxygen barrier reinforcing material was 89:11, and the obtained container was measured for oxygen permeability and evaluated by the above method. It was. The results are shown in Table 1.
  • Example 3 A container was prepared in the same manner as in Experimental Example 1 except that the LDPE of the oxygen barrier reinforcing material was changed to LDPE-D of MFR 0.3 g / 10 min (190 ° C.), and the obtained container was subjected to oxygen permeation by the above method. The degree was evaluated. The results are shown in Table 1.
  • Reference Example 6 A container was prepared in the same manner as in Reference Example 5 except that the LDPE constituting the oxygen barrier reinforcing layer was changed to LDPE-D with MFR 0.3 g / 10 min (190 ° C.), and the obtained container was bonded by the above method. The strength was evaluated. The results are shown in Table 2.
  • Example 5 A container was prepared in the same manner as in Experimental Example 1 except that the LDPE constituting the oxygen barrier reinforcing material was changed to LDPE-B of MFR 1.0 g / 10 min (190 ° C.), and the obtained container was bonded by the above method. The strength was evaluated. The results are shown in Table 2.
  • Example 6 A container was prepared in the same manner as in Experimental Example 5 except that the compatibilizer-A constituting the oxygen barrier reinforcing material was changed to the compatibilizer-B, and the adhesive strength of the obtained container was evaluated by the above method. went. The results are shown in Table 2.
  • Example 7 A container was prepared in the same manner as in Experimental Example 1 except that the LDPE constituting the oxygen barrier reinforcing material was changed to LDPE-C having an MFR of 0.7 g / 10 min (190 ° C.), and the obtained container was bonded by the above method. The strength was evaluated. The results are shown in Table 2.
  • Example 8 A container was prepared in the same manner as in Experimental Example 1 except that the LDPE of the oxygen barrier reinforcing material was changed to LDPE-D of MFR 0.3 g / 10 min (190 ° C.). Was evaluated. The results are shown in Table 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne un récipient en plastique multicouche qui comprend : des couches interne et externe qui sont composées d'une résine à base d'oléfine; et une couche barrière à l'oxygène qui est disposée en tant que couche intermédiaire et qui comprend un copolymère d'éthylène-alcool vinylique, le récipient en plastique multicouche étant caractérisé en ce qu'il contient, comme matériaux principaux, un matériau hygroscopique et un polyéthylène basse densité, et en ayant une couche de renforcement de barrière à l'oxygène contenant un agent de compatibilité qui est disposée de manière contiguë au moins sur un côté de surface périphérique interne du récipient de la couche barrière à l'oxygène.
PCT/JP2019/021658 2018-05-31 2019-05-31 Récipient en plastique multicouche comprenant un copolymère d'éthylène-alcool vinylique WO2019230929A1 (fr)

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CN114670520A (zh) * 2022-03-31 2022-06-28 合肥无涯科技有限公司 一种高阻隔耐穿刺的生物工艺袋用膜材及其制备方法

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