JP2006001622A - Recyclable multi-layer structure and recycled multi-layer structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recyclable multi-layer structure excellent in water absorbency, and a recycled multi-layer structure made by partially using recycled resin made from the main body or waste part of the multi-layer structure. <P>SOLUTION: The recyclable multi-layer structure comprises: at least a blend resin layer A comprising ethylene-α olefine copolymer resin having a density of 0.850-0.93 g/cm<SP>3</SP>by a single site catalyst and a moisture absorbing inorganic compound; and a thermoplastic resin layer comprising polyolefin resin having a straight chain branch. The polyolefin resin having a straight chain branch is any one of a low density polyethylene resin, a single site ethylene-α olefine copolymer resin, and a long chain branch introduced polypropylene resin. The inorganic compound is any one of or a mixture of zeolite, calcium oxide, calcium chloride, sulfate compound, alumina, activated carbon, clay mineral and silica gel. The recycled multi-layer structure made by recycling the recyclable multi-layer structure is also disclosed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multilayer structure having both moisture absorption and recyclability, and a recycled multilayer structure partially using a recycled resin obtained by crushing a main body portion or an unnecessary portion of the multilayer structure.

  Various functions are required for laminated materials used for packaging foods, pharmaceuticals / medical products, precision electronic parts and other industrial parts, and these functions prevent various alterations of contents. However, in recent years, a recyclable function for reusing the laminated material has been required for the construction of a recycling society. The method for preventing the deterioration due to water vapor will be described. For example, a polyolefin resin having moisture resistance is used, or when a higher water vapor barrier property is required, a polyolefin resin, a polyester resin or a polyamide is used. There is a method of using a film made of a vinyl resin coated with a vinylidene chloride resin, but since the vinylidene chloride resin contains a chlorine component, it generates harmful substances when discarded or incinerated. There was a fear. In addition, some contents may be altered or deteriorated due to slight humidity or moisture in the head space when the contents are packaged, and not only the water vapor barrier property from the outside of the packaging container but also the head There is a need to remove moisture and moisture in the space, and in order to respond to these needs, a desiccant filled and sealed in a sachet is packed with the contents, or inside the cap or lid, Attempts have been made to remove the moisture in the packaging container by installing a desiccant filled and sealed in the sachet, but the desiccant filled and sealed in the sachet has problems such as accidental ingestion and accidental eating. Also, there were problems such as troublesome wearing. To improve these problems, a container having a resin layer in which a desiccant and a channel structure forming agent are blended with a thermoplastic resin and a highly moisture-proof polyolefin resin layer has been proposed (for example, see Patent Document 1). However, in the proposed container, a fine crack is generated in a resin layer in which a channel structure forming agent including a desiccant and a thermoplastic resin is blended, and the crack is used as a passage for moisture so as to be hygroscopic. Therefore, there are problems such as lowering the strength properties of the container, and there is also a problem in terms of recyclability.

Further, when producing a multilayer structure such as a blow molded product, an injection molded product, or a laminated film, unnecessary portions such as burrs and ears (film edge portions) are inevitably generated. Until now, these unnecessary parts have been discarded as they are. However, these unnecessary parts such as burrs and ears have been reused as recycled materials from the viewpoint of cost reduction of products and disposal problems. In the past, recycled materials consisting of unnecessary parts such as burrs and ears have been made by blending a single-material structure into the same material. Multi-layering has become conspicuous, and multi-layered structures have been used as recycled materials as they are. However, when the multilayer structure is crushed and used as a recycled material, the following problems have been encountered. For example, FIG. 3A is a partial cross-sectional view of a two-layer structure, FIG. 3B is a partial cross-sectional view of a two-layer structure, and FIG. FIG. 3 is a partial cross-sectional view of the reproduction structure. The two-layer structure includes a resin layer (31) and a resin layer (32), and the resin used for the resin layer (31) and the resin used for the resin layer (32) are mutually compatible. The resin used in the resin layer (31) and the resin used in the resin layer (32) may be incompatible with each other. Using a mixed resin obtained by blending a recycled resin made by pulverizing the two-layer structure into the resin used in the resin layer (32), the two-layer reproduction structure shown in (b) When the body is prepared, the resin layer (33) has a structure in which the recycled resin and the resin used in the resin layer (32) are completely compatible. In the latter case, the two-layer structure is crushed. A mixed tree in which a recycled resin made of the above is blended with the resin used in the resin layer (32) When the regenerated structure having a two-layer structure shown in (c) is used, the resin layer (34) is incompatible with the resin, and the resin used for the resin layer (31) The resin layer (34) has a structure that exists in a sea-island state, causing problems such as deterioration in molding processability and failure to obtain a good regenerated structure.
US Pat. No. 6,214,255

  The problem of the present invention is that the multilayer structure itself has a moisture absorption property and has an excellent recyclability, and the reproduction of the multilayer structure and the unnecessary portion separated from the multilayer body. An object of the present invention is to provide a reclaimed multilayer structure using a resin partly.

The invention according to claim 1 of the present invention is a multilayer structure, and an innermost surface of the ethylene-α olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a water absorption property by a single site catalyst. A multilayer structure having recyclability, characterized in that it is composed of a blend resin layer A composed of an inorganic compound having a structure, and an outermost surface composed of a thermoplastic resin layer composed of a polyolefin resin having a linear branch.

The invention according to claim 2 of the present invention is a multilayer structure, comprising at least one of the innermost surface and the outermost surface comprising a thermoplastic resin layer made of a polyolefin resin having a linear branch, and the middle is a single site. Recyclability characterized by comprising a blend resin layer A composed of an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / c ³ and a water-absorbing inorganic compound based on a system catalyst. It is a multilayer structure.

  The invention according to claim 3 of the present invention is the invention according to claim 1 or claim 2, wherein the polyolefin resin having a linear branch is a low-density polyethylene resin, a single-site ethylene-polymer obtained by a geometrically constrained catalyst. A multilayer structure having recyclability, which is either an α-olefin copolymer resin or a polypropylene resin into which long-chain branches are introduced by radical reaction.

  The invention according to claim 4 of the present invention is the sulfate according to any one of claims 1 to 3, wherein the inorganic compound comprises zeolite, calcium oxide, calcium chloride, shochu liquor or magnesium sulfate. It is a multilayer structure having recyclability characterized by comprising any one of a compound, alumina, activated carbon, clay mineral, and silica gel, or a mixture thereof.

The invention according to claim 5 of the present invention is a structure having a multilayer structure, the innermost surface of the multilayer structure having recyclability according to any one of claims 1 to 4 It consists of a recycled resin made by crushing the separated unnecessary portion, an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ by a single-site catalyst, and an inorganic compound having moisture absorption. A recycled multilayer structure comprising a blend resin layer B and an outermost surface comprising a thermoplastic resin layer.

The invention according to claim 6 of the present invention is a multilayer structure, wherein the innermost surface and the outermost surface are made of a thermoplastic resin layer, and the middle is the recyclability according to any one of claims 1 to 4. Of ethylene-α-olefin copolymer having a density of 0.850 to 0.930 g / cm ³ using a single-site catalyst and a recycled resin obtained by crushing a main body portion of a multilayered structure having crumbs or an unnecessary portion separated from the main body portion It is a reproduction | regeneration multilayered structure characterized by consisting of the blend resin layer B which consists of resin and the inorganic compound which has a water absorptivity.

The multilayer structure having recyclability of the present invention comprises an ethylene-α-olefin copolymer resin having an innermost surface of a density of 0.850 to 0.930 g / cm ³ by a single-site catalyst, an inorganic compound having moisture absorption, A polyolefin resin having a blended resin layer A and an outermost surface comprising a thermoplastic resin layer having a linear branch or at least one of the innermost surface and the outermost surface having a linear branch A blend resin comprising an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a water-absorbing inorganic compound using a single-site catalyst. Layer A, and the inorganic compound is zeolite, calcium oxide, calcium chloride, shochu liquor or sulfuric acid Because it is composed of any one of sulfate compounds composed of nesium, alumina, activated carbon, clay minerals, and silica gel, or a mixture thereof, it has excellent moisture absorption and is composed of a polyolefin resin having a linear branch. Since it has at least one resin layer, recyclability is also good. Further, the recycled multilayer structure has a density of 0.850 based on a recycled resin and a single-site catalyst formed by pulverizing the main body portion of the multilayer structure having the above-mentioned recyclability and the unnecessary portion separated from the main body portion. together consisting ~0.930g / cm ³ of the blend resin layer comprising an inorganic compound having an ethylenically -α-olefin copolymer resin and moisture absorbent B, or the outermost surface is formed of a thermoplastic resin layer, or the innermost surface and Density of recycled resin and single-site catalyst consisting of a thermoplastic resin layer on the outermost surface and the middle part of the multilayer structure having the above recyclability suitable for crushed unnecessary parts separated from the body part or the body part blend resin comprising an inorganic compound having a 0.850~0.930g / cm ³ ethylene -α-olefin copolymer resin and water absorption Since it is made of B, it has excellent moisture absorption, good workability at the time of manufacture, good adhesion between each layer of the laminated structure, selection of inorganic compounds and selection of thermoplastic resins as appropriate By doing so, it is possible to control the internal humidity, and it is also possible to impart recyclability.

  The multilayer structure having recyclability and the recycled multilayer structure of the present invention will be described below along the embodiments. FIG. 1 (a) is a cross-sectional view showing an embodiment of a multilayer structure having recyclability according to the present invention. The multilayer structure (10) has a two-layer structure, and the innermost surface is an inorganic compound having moisture absorption. It is composed of a blend resin layer A (2) containing (1), the outermost surface is composed of a thermoplastic resin layer (4), and (b) shows another embodiment of a multilayer structure having recyclability. It is sectional drawing, a multilayer structure (11) is 3 layer structure, an innermost surface consists of a thermoplastic resin layer (6), and the middle is the blend resin layer A containing the inorganic compound (1) which has a water absorption property ( 2), and the outermost surface is made of a thermoplastic resin layer (5).

  FIG. 2A is a cross-sectional view showing an embodiment of the reclaimed multilayer structure of the present invention. The reclaimed multilayer structure (20) has a two-layer structure, and the innermost surface is an inorganic compound (1) having moisture absorption. And (b) is a cross-sectional view showing another embodiment of a recycled multilayer structure, wherein the outermost surface is composed of a thermoplastic resin layer (7). The structure (21) has a three-layer structure, the innermost surface is made of the thermoplastic resin layer (9), and the middle is made of the blend resin layer B (3) containing the moisture-absorbing inorganic compound (1). The outer surface is made of a thermoplastic resin layer (8).

The blend resin layer A (2) is composed of an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a water-absorbing inorganic compound (1) by a single-site catalyst. The blend resin layer B (3) is obtained by crushing the main body part of the multilayer structure (10) or the multilayer structure (11) or unnecessary parts (for example, burr parts, ear parts) separated from the main body part. And an inorganic compound (1) having a water-absorbing property and an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a single-site catalyst.

The blend resin layer A (2) and the blend resin layer B (3) use an ethylene-α olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ based on a single site catalyst as follows. This is because of the reason shown. Advantages of using a single-site catalyst are (a) a narrow molecular weight distribution of the resin, (b) easy control of the introduction position of the comonomer, and (c) a large number of tie molecules existing between lamellae. It has excellent characteristics such as (d) flexibility and (e) excellent stress cracking resistance, and further has a density of 0.850 to 0.930 g / cm ³ , particularly a density of 0.850. ~0.925g / cm ³ things enters the category of polyolefin elastomer or plastomer, highly preferred in terms of adhesion and strength properties. That is, in view of the adhesiveness between different types of resins, it is very preferable to use a plastomer or an elastomer having a low low molecular weight component that inhibits the adhesion and a small distortion at the adhesive interface. Further, the ethylene-α olefin copolymer resin based on a single site catalyst has excellent dispersibility of the inorganic compound when blended with the inorganic compound, and the blend resin layer A (2) and the thermoplastic resin layer (4, 5, 6). Even if a multilayer structure is prepared using a resin having an incompatible combination, a material having good moldability and good strength properties can be obtained. Use of a material having a density exceeding 0.930 g / cm ³ is not good because the adhesion with different materials is deteriorated due to the influence of interface distortion accompanying crystallization.

  The inorganic compound (1) preferably has a saturated water absorption of at least 10% of its own weight in an atmosphere with a relative humidity of 90%. Examples of the inorganic compound include zeolite, calcium oxide, calcium chloride, zinc oxide, barium titanate, sulfate compounds such as magnesium sulfate and calcined meteorite, alumina, activated carbon, clay mineral, silica gel, or a mixture thereof. Preferably, if it is selected according to the desired water absorption function and it is desired to keep the inside of the multilayer structure in an absolutely dry state, it is preferable to select a material that hardly absorbs moisture absorbed and has water absorption performance even at low humidity, In that case, zeolite, calcium oxide, silica gel and the like are preferably selected. On the other hand, when it is desired to control (control humidity) the multilayer structure within a certain range of relative humidity, a material capable of adsorbing and desorbing moisture is preferable. In this case, sulfates such as magnesium sulfate and calcined meteorite Compounds are preferred. These inorganic compounds may be pretreated (surface treatment) in advance for improving dispersibility.

  The thermoplastic resin layer (4) is made of a polyolefin resin having a linear branch, and the type thereof is a low-density polyethylene resin, a single-site ethylene-α-olefin copolymer resin obtained by a geometrically constrained catalyst, Or the polypropylene resin which introduce | transduced the long chain branch by radical reaction is preferable.

  Furthermore, the thermoplastic resin layer (5) and the thermoplastic resin layer (6) are made of a polyolefin resin in which either one or both layers have a linear branch. In addition, when using polyolefin resin which does not have long chain branching, for example, polypropylene resin, ethylene-cyclic olefin copolymer resin, high density polyethylene resin, high density ethylene-α olefin copolymer resin, etc. Is used.

The thermoplastic resin layer (7, 8, 9) may use any resin of the polyolefin resin having the straight chain branch or the polyolefin resin having no long chain branch, but the thermoplastic resin layer ( 7) The use of a polyolefin resin having linear branching improves the processability when it is further reused. Similarly, one of the thermoplastic resin layer (8) and the thermoplastic resin layer (9). It is preferable to use a polyolefin resin having a linear branch in order to improve processability when it is reused.

The multilayer structure (10), the multilayer structure (11), and the recycled multilayer structure (20
In any layer constituting the recycled multilayer structure (21), various additives such as various additives, antioxidants, flame retardants, slip agents, antiblocking agents, and dispersants are blended as necessary. It doesn't matter.

  Examples of the multilayer structure and the recycled multilayer structure having recyclability according to the present invention include a hollow bottle container, a tray-shaped container, a packing used for a lid portion of the container, a closure used for the container, and the like.

  Hereinafter, the multilayer structure having recyclability of the present invention and the recycled multilayer structure will be described with reference to specific examples.

<Preparation of resin for masterbatch used for blend resin layer A (2)>
Hereinafter, the masterbatch resin was prepared using a twin screw extruder (φ = 30, L / D = 49) under the conditions of a discharge rate of 9 kg / h, a resin temperature of 200 ° C., and 50 rpm.
(1) Preparation of resin A for masterbatch Using ethylene / hexene-1 copolymer resin having a density of 0.920 g / cm ³ obtained using a single-site catalyst as the base resin, as a moisture-absorbing inorganic compound Using calcium oxide, it was prepared by kneading so that the blending ratio of base resin / inorganic compound = 60/40 (weight% ratio).
(2) Preparation of resin B for masterbatch Using ethylene / hexene-1 copolymer resin with a density of 0.920 g / cm ³ obtained by using a single-site catalyst as the base resin, as a moisture-absorbing inorganic compound It was prepared by kneading using a shochu cake so that the blend ratio of base resin / inorganic compound = 70/30 (weight% ratio).

Blend resin layer A (2) is blended with ethylene hexene-1 copolymer resin (single site catalyst) with a density of 0.920 g / cm ^{3 and} the masterbatch resin A, and the amount of calcium oxide added is 20 wt. %, A high-density polyethylene (HDPE) resin is used as the thermoplastic resin layer (5), and a low-density polyethylene (LDPE) resin is used as the thermoplastic resin layer (6). In molding, the inner surface is LDPE / blend resin layer A / HDPE = 10/30/60 (thickness ratio) (outer surface), and the blend resin layer A contains 1.3 g of calcium oxide, and the inner volume is 100 mm. A multilayer structure having a hollow shape and having recyclability of the present invention was prepared.

Blend resin layer A (2) was prepared by blending resin B for masterbatch with ethylene / hexene-1 copolymer resin having a density of 0.920 g / cm ³ and adjusting the addition amount of shochu cake to 15% by weight. Use multi-layer blow molding, using high density polyethylene (HDPE) resin as the thermoplastic resin layer (5) and low density polyethylene (LDPE) resin as the thermoplastic resin layer (6) (inner surface) LDPE / blend resin layer A / HDPE = 10/30/60 (thickness ratio) (outer surface) in a three-layer configuration, the blend resin layer A contains 1.0 g of shochu soot and has a hollow shape of 100 mm. A multilayer structure having the recyclability was prepared.

The blended resin layer B (3) is a blended resin having a ratio of recycled resin / masterbatch resin A = 10/90 (% by weight) made of crushed burrs separated from the multilayer structure produced in Example 1 Further, a low-density polyethylene resin with a calcium oxide addition amount adjusted to 20% by weight is used, and a high-density polyethylene (HDPE) resin is used as the thermoplastic resin layer (8), and the thermoplastic resin layer (9 ) Using low density polyethylene (LDPE) resin as a multi-layer blow molding, (inner surface) LDPE / blend resin layer B / HDPE = 10/30/60 (thickness ratio) (outer surface) 3 layer composition, blend A resin layer B containing 1.3 g of calcium oxide and having a hollow shape of a reclaimed multilayer structure of the present invention having an internal volume of 100 mm was prepared.

  The blended resin layer B (3) is a blended resin having a ratio of recycled resin / masterbatch resin B = 10/90 (% by weight) made of crushed burrs separated from the multilayer structure produced in Example 2 Using a low-density polyethylene resin with an addition amount of shochu cake adjusted to 15% by weight, a high-density polyethylene resin (HDPE) is used as the thermoplastic resin layer (8), and a thermoplastic resin layer (9 ) Using low density polyethylene resin (LDPE) as a multilayer blow molding, (inner surface) LDPE / blend resin layer B / HDPE layer = 10/30/60 (thickness ratio) (outer surface) in a three-layer configuration, A blended resin layer B containing 1.0 g of shochu cake and having a hollow shape of 100 mm in internal volume was produced as a recycled multilayer structure of the present invention.

  As the blend resin layer A (2), an ethylene / octene-1 copolymer resin having a long-chain branch is blended with the resin A for masterbatch, and the amount of calcium oxide added is adjusted to 20% by weight. This was carried out except that a homopolypropylene resin (homo PP) resin was used as the thermoplastic resin layer (5) and an ethylene / octene-1 copolymer resin having a long chain branch was used as the thermoplastic resin layer (6). A multilayer structure having recyclability is prepared in the same manner as in Example 1, and then, burrs separated from the multilayer structure are crushed to prepare a recycled resin, and the recycled resin / master is used with the recycled resin. A resin blend for batch A = 10/90 (% by weight) was prepared, the blended resin was used as the blend resin layer B (3), and the high density polyethylene was used as the thermoplastic resin layer (8). (HDPE) resin, low density polyethylene (LDPE) resin as the thermoplastic resin layer (9), and multilayer blow molding, (inner surface) LDPE layer / blend resin layer B / HDPE layer = 10 / A three-layer structure of 30/60 (thickness ratio) (outer surface), 1.3 g of calcium oxide was contained in the blend resin layer B, and a hollow multilayer recycled multilayer structure of the present invention having an internal volume of 100 mm was prepared.

  Blend resin layer A (2) is prepared by blending the masterbatch resin A with an ethylene / hexene-1 copolymer resin having no long chain branches and adjusting the addition amount of calcium oxide to 20% by weight. Example 1 except that a block polypropylene resin (block PP) resin having a long chain branch was used as the thermoplastic resin layer (5) and a low density polyethylene resin was used as the thermoplastic resin layer (6). In the same manner as above, a multilayer structure having recyclability is prepared, and then, burrs separated from the multilayer structure are crushed to prepare a recycled resin, and the recycled resin is used for the recycled resin / masterbatch. A blended resin having a ratio of Resin A = 10/90 (% by weight) is prepared, the blended resin is used as the blend resin layer B (3), and the high density polyester is used as the thermoplastic resin layer (8). Len (HDPE) resin, low density polyethylene (LDPE) resin as thermoplastic resin layer (9), multilayer blow molding, (inner surface) LDPE layer / blend resin layer B / HDPE layer = 10 / A three-layer structure of 30/60 (thickness ratio) (outer surface), 1.3 g of calcium oxide was contained in the blend resin layer B, and a hollow multilayer recycled multilayer structure of the present invention having an internal volume of 100 mm was prepared.

  In the following, comparative examples of the present invention will be described.

  A multilayer structure having a comparatively recyclable hollow shape was prepared in the same manner as in Example 1 except that a resin not containing calcium oxide was used as the resin of the blend resin layer A.

  As the blend resin layer A, an ethylene / hexene-1 copolymer resin having no long chain branching is blended with the resin A for masterbatch, and the amount of calcium oxide added is adjusted to 20% by weight. In the same manner as in Example 1 except that a homopolypropylene resin (homo PP) resin was used as the thermoplastic resin layer (5) and an ethylene / hexene-1 copolymer resin was used as the thermoplastic resin layer (6). Then, a multilayer structure having recyclability is prepared, and then, burrs separated from the multilayer structure are crushed to prepare a recycled resin, and the recycled resin / masterbatch resin A = A blended resin having a ratio of 10/90 (% by weight) was prepared, the blended resin was used as the blend resin layer B (3), and the high-density polyethylene (HDPE) was used as the thermoplastic resin layer (8). Using fat, using low density polyethylene (LDPE) resin as the thermoplastic resin layer (9), and multilayer blow molding, (inner surface) LDPE layer / blend resin layer B / HDPE layer = 10/30/60 ( A recycled multilayer structure of the present invention having a three-layer structure (thickness ratio) (outer surface) and containing 1.3 g of calcium oxide in blend resin layer B and having an internal volume of 100 mm was produced.

  As the blend resin layer A, an ethylene / octene-1 copolymer resin having no long chain branching is blended with the resin A for masterbatch, and the amount of calcium oxide added is adjusted to 20% by weight. In the same manner as in Example 1, except that a homopolypropylene resin (homo PP) resin was used as the thermoplastic resin layer (5) and an ethylene-octene-1 copolymer resin was used as the thermoplastic resin layer (6). Then, a multilayer structure having recyclability is prepared, and then, burrs separated from the multilayer structure are crushed to prepare a recycled resin, and the recycled resin / masterbatch resin A = A blended resin having a ratio of 10/90 (% by weight) was prepared, the blended resin was used as the blend resin layer B (3), and the thermoplastic resin layer (8) was high density polyethylene (HDPE) Using fat, using low density polyethylene (LDPE) resin as the thermoplastic resin layer (9), and multilayer blow molding, (inner surface) LDPE layer / blend resin layer B / HDPE layer = 10/30/60 ( A three-layer structure having a thickness ratio (outer surface) of 1.3 g of calcium oxide in blend resin layer B and a hollow multilayer recycled multilayer structure of the present invention having an internal volume of 100 mm was prepared.

<Evaluation>
The multilayer structure having recyclability of the present invention in the hollow shape of Examples 1 to 2, the reclaimed multilayer structure of the present invention in the hollow shape of Examples 3 to 6, and the multilayer structure for comparison of the hollow shape of Example 7 Body and the hollow multi-layer structure for comparison in Examples 8-9, the opening was sealed with a cap equipped with a sensor, and stored in an environment of 40 ° C. and 90% RH, immediately after storage 1 day, 7 days, 14 days, 21 days, and 30 days later, the internal humidity was measured, and the regenerated multilayer structure of the hollow shape of Examples 3-6 and the hollow shapes of Examples 8-9 were used. About the reproduction | regeneration multilayered structure for a comparison, the quality of the moldability and the adhesiveness of an interlayer was evaluated. The results are shown in Table 1.

表１の結果に示すように、実施例１の本発明の再生利用適性を有する多層構造体は４０℃、９０％ＲＨの環境下での保存試験で、多層構造体内部の湿度が保存直後に比べて保存１日後から大きく低下しており、多層構造体が優れた水分吸収性能を有していることを示しており、実施例２の本発明の再生利用適性を有する多層構造体は、同様な保存試験で、多層構造体内部の湿度がコントロールされていることを示しており、一方、実施例７の比較用の多層構造体は同様な保存試験で、多層構造体内部の湿度が保存直後から増加してお
り、多層構造体の水分吸収性性能が悪いことを示している。また、実施例３、実施例５、実施例６の本発明の再生多層構造体は、優れた水分吸収性能を有すると共に、製造時の成形性も良好で、積層構成の層間の接着性も良好であり、実施例４の本発明の再生多層構造体は内部の湿度がコントロールされていると共に、製造時の成形性も良好で、積層構成の層間の接着性も良好であり、実施例８〜９の比較用の再生多層構造体は製造時の成形性が悪く、特に実施例９の比較用の再生多層構造体は、積層構成の層間の接着性が不良であった。

As shown in the results of Table 1, the multilayer structure having recyclability of the present invention of Example 1 was tested in a storage test under an environment of 40 ° C. and 90% RH, and the humidity inside the multilayer structure was immediately after storage. Compared with one day after storage, the content greatly decreased, indicating that the multilayer structure has excellent moisture absorption performance. The multilayer structure having recyclability of the present invention of Example 2 is the same as the multilayer structure. The storage test shows that the humidity inside the multilayer structure is controlled, while the comparative multilayer structure of Example 7 shows that the humidity inside the multilayer structure is just after storage in the same storage test. It indicates that the moisture absorption performance of the multilayer structure is poor. In addition, the recycled multilayer structures of the present invention of Examples 3, 5 and 6 have excellent moisture absorption performance, good moldability at the time of manufacture, and good adhesion between the laminated layers. In the recycled multilayer structure of the present invention of Example 4, the internal humidity is controlled, the moldability during production is good, and the adhesion between the layers of the laminated structure is also good. The comparative recycled multilayer structure of No. 9 had poor moldability at the time of production. In particular, the comparative recycled multilayer structure of Example 9 had poor adhesion between the layers of the laminated structure.

(A) is sectional drawing which shows one Embodiment of the multilayer structure which has the recyclability of this invention, (b) is sectional drawing which shows other embodiment of the multilayer structure which has recyclability. (A) is sectional drawing which shows one Embodiment of the reproduction | regeneration multilayer structure of this invention, (b) is sectional drawing which shows other embodiment of the reproduction | regeneration multilayer structure. (A) is a partial cross-sectional view of a two-layer structure, (b) is a partial cross-sectional view of a two-layer structure, and (c) is another two-layer structure. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inorganic compound 2 ... Blend resin layer A
3. Blend resin layer B
4, 5, 6, 7, 8, 9 ... thermoplastic resin layers 10, 11 ... multilayer structures 20, 21 ... recycled multilayer structures 31, 32, 33, 34 ... resin layers having recyclability

Claims (6)

A blend resin layer A having a multilayer structure and an innermost surface comprising an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a water-absorbing inorganic compound based on a single-site catalyst. A multilayer structure having recyclability, characterized in that the outermost surface comprises a thermoplastic resin layer made of a polyolefin resin having a linear branch. A multi-layered structure, at least one of the innermost and outermost surfaces is made of a thermoplastic resin layer made of a polyolefin resin having a linear branch, and the middle has a density of 0.850 to 0.930 g based on a single-site catalyst. A multilayer structure having recyclability characterized by comprising a blend resin layer A composed of an ethylene / α-olefin copolymer resin of / cm ³ and an inorganic compound having moisture absorption.   The polyolefin resin having linear branches is either a low-density polyethylene resin, a single-site ethylene-α olefin copolymer resin obtained by a geometrically constrained catalyst, or a polypropylene resin into which long-chain branches are introduced by radical reaction. The multilayer structure having recyclability according to claim 1 or 2.   2. The inorganic compound is made of any one of zeolite, calcium oxide, calcium chloride, shochu liquor or magnesium sulfate, alumina, activated carbon, clay mineral, silica gel or a mixture thereof. A multilayer structure having recyclability according to any one of claims 3 to 4. 5. A multi-layer structure having an innermost surface crushed from a main body portion of the multi-layer structure having recyclability according to any one of claims 1 to 4 or an unnecessary portion separated from the main body portion. It consists of a blended resin layer B composed of an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ and a water-absorbing inorganic compound using a regenerated resin and a single-site catalyst, and the outermost surface is heated. A recycled multilayer structure comprising a plastic resin layer. 5. A main body portion or a main body portion of a multi-layer structure having recyclability according to any one of claims 1 to 4, wherein the innermost surface and the outermost surface are made of a thermoplastic resin layer in a multilayer structure. From a regenerated resin obtained by crushing an unnecessary part separated from the resin, an ethylene-α-olefin copolymer resin having a density of 0.850 to 0.930 g / cm ³ by a single-site catalyst, and an inorganic compound having moisture absorption A recycled multilayer structure comprising the blend resin layer B.

Images