JP2015098110A - Foam laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a foam laminate exhibiting excellent heat insulation properties and also having excellent gas barrier properties.SOLUTION: A foam laminate at least includes: a layer (A) arranged adjacent to a paper substrate; a layer (B) being a foam layer arranged on the other side of the paper substrate and adjacent to the paper substrate; and a layer (C) arranged outer than the layer (B). The layer (A) includes a polyethylene-based resin (a) whose density is 935-970 kg/m. The layer (B) includes a high-pressure-processed low density polyethylene (b) whose density is 910-930 kg/m. The layer (C) includes a gas barrier coating agent (c).

Description

  The present invention relates to a foam laminate having a large thickness of a foam layer, showing good heat insulating properties and excellent gas barrier properties.

  Conventionally, as a container having a heat insulating property, a synthetic resin, in particular, a polystyrene foamed one is often used. However, the expanded polystyrene container has drawbacks such as high environmental load at the time of disposal and poor printability, and alternatives to other materials are being studied. Under such circumstances, a container in which corrugated paper is pasted on the outer peripheral surface of the paper cup body to form a heat insulating layer, a container in which a laminate of pulp nonwoven fabric and coated paper is bonded to the outer peripheral surface of the paper cup, etc. Has been developed and used.

  However, each method has a drawback that it is not easy to process and mold, and the cost is high. Therefore, by laminating and heating a low-melting-point thermoplastic synthetic resin film on at least one surface of the moisture-containing base material, the synthetic resin film is foamed into irregularities using the moisture contained in the base material. Has been devised (see, for example, Patent Documents 1 to 3). However, the material thus obtained has a thin foam layer and insufficient heat insulation.

  Further, as a means for obtaining a foam having a thick foam layer, a technique has been proposed in which at least a part of the foam surface is vacuum-sucked to thicken the foam layer of the foam cell (see, for example, Patent Document 4). In addition, the container body member and the bottom plate member are laminated, and a high melting point thermoplastic synthetic resin film is laminated on the inner wall surface of the base material of the container body member and the bottom plate member. There has been proposed a heat-insulating paper container in which a plastic synthetic resin film is laminated and the low-melting thermoplastic synthetic resin film is foamed by heat treatment (see, for example, Patent Document 5).

  However, the method of thickening the foamed layer by vacuum suction is inferior in cost performance because a vacuum suction device is necessary and a step of performing vacuum suction in the manufacturing process is necessary. In addition, the heat insulating paper container having a high-melting thermoplastic synthetic resin on the inner wall surface is inferior in gas barrier properties.

  Moreover, the method of providing the barrier layer which consists of an aluminum foil and the stretched polyester film which suppress permeation | transmission of water vapor | steam on an inner wall surface, and providing a sealant layer on it is proposed (for example, refer patent documents 6-7).

Japanese Patent Publication No. 48-32283 JP-A-57-110439 JP 2001-270571 A JP 2004-58534 A Japanese Patent Laid-Open No. 2007-217024 JP 2003-261128 A JP 2004231197 A

  However, the method of providing a barrier layer and a sealant layer uses an expensive barrier layer, and the layer configuration is complicated, resulting in poor cost performance.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a specific foam laminate exhibits excellent heat insulation and gas barrier properties, and have completed the present invention.

That is, at least the (A) layer is arranged adjacent to the paper base layer, and the other paper base is a foam layer adjacent to the paper base (B) layer and the outer surface from the (B) layer. (C) is a foamed laminate in which the layer (A) has a density measured by JIS K6922-1 (2011) of 935 kg / m ³ or more and 970 kg / m ³ or less. resin (a), (B) layer is JIS K6922-1 density measured by (2011) is 910 kg / ^{m 3} or more 930 kg / ^{m 3} or less is high-pressure low-density polyethylene (b), the (C) layer The present invention relates to a foam laminate comprising a gas barrier coating agent (c).

  Hereinafter, the present invention will be described in detail.

The density (hereinafter simply abbreviated as density) measured by JIS K6922-1 (2011) of the polyethylene-based resin (a) constituting the present invention is excellent in heat insulation and foaming stability. / ^m is in the range of ^3, more preferably in the range of 945～970Kg / ^{m 3,} most preferably from 950～965Kg / ^{m 3.} When the density of the polyethylene-based resin (a) is less than 935 kg / m ^3, it is not preferable because of poor heat insulation, and when it exceeds 970 kg / m ³ , it is not preferable because of poor foam appearance.

  The polyethylene resin (a) constituting the present invention is an ethylene homopolymer or an ethylene / α-olefin copolymer and a composition thereof, and the molecular chain may be linear and has 6 carbon atoms. You may have the above long chain branching. Such a polyethylene-based resin (a) is not particularly limited, and may be as long as the density range is not exceeded.

  Examples of the ethylene homopolymer include low-pressure ethylene homopolymer and high-pressure low-density polyethylene. The low-pressure ethylene homopolymer can be obtained by a conventionally known low-pressure ion polymerization method. Moreover, the high pressure method low density polyethylene can be obtained by a conventionally known high pressure radical polymerization method.

  Examples of the α-olefin used in the ethylene / α-olefin copolymer include propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and the like can be mentioned, and one or more of these can be used.

  The method for obtaining the ethylene / α-olefin copolymer is not particularly limited, and examples thereof include a high / medium / low pressure ion polymerization method using a Ziegler-Natta catalyst, a Philips catalyst, or a metallocene catalyst. Such a copolymer can be conveniently selected from commercially available products.

  Among these, since the laminate moldability is excellent, the high-density polyethylene (c) 10 to 90% by weight and the high-pressure method low-density polyethylene (d) 90 to 10% by weight (the total of (c) and (d) is 100). It is preferable that it is an ethylene resin composition (e) containing (weight%).

  Examples of such high-density polyethylene (c) include low-pressure ethylene homopolymers and ethylene / α-olefin copolymers.

  Further, in the high density polyethylene (c), the melt processability of the ethylene resin composition (e) is excellent, so the melt mass flow rate (hereinafter simply abbreviated as MFR) measured according to JIS K6922-1 (2011) is The range of 6 to 100 g / 10 min is preferable, and the range of 8 to 60 g / 10 min is more preferable.

Further, in the high density polyethylene (c), the ethylene resin composition (e) is excellent in laminate processability and productivity, so that the density is preferably in the range of 935 to 980 kg / m ³ , more preferably 945 to 975 kg / m. ³ range.

  In the high-pressure method low-density polyethylene (d), the MFR is preferably in the range of 0.1 to 20 g / 10 min, more preferably 0.3 to 10 g, because the extrusion processability of the ethylene-based resin composition (e) is excellent. / 10 minutes, most preferably in the range of 1-4 g / 10 minutes.

Moreover, in the high-pressure method low-density polyethylene (d), the density is preferably in the range of 910 to 935 kg / m ³ because the film-forming stability of the ethylene-based resin composition (e) is excellent.

  The MFR of the ethylene-based resin composition (e) is preferably in the range of 1 to 50 g / 10 minutes and more preferably in the range of 3 to 20 g / 10 minutes because of excellent laminate moldability.

  In addition, the polyolefin resin (a) constituting the present invention may be blended with other polyolefins such as polypropylene, and the blending ratio of these polyolefins is 1 to 30% by weight of laminate moldability and laminate appearance. It is preferable from the point.

  When the polyolefin is mixed with the polyethylene resin (a) constituting the present invention, a pellet mixture in which the pellets of the polyethylene resin (a) and the polyolefin pellets are mixed in a solid state may be used. A mixture obtained by melt-kneading with a twin screw extruder, kneader, Banbury or the like is preferable because a product with stable quality can be obtained. When using a melt-kneading apparatus, the melting temperature is preferably about the melting point of polyethylene resin to about 300 ° C.

  Furthermore, for the polyethylene resin (a) constituting the present invention, additives generally used for polyolefin resins, such as an antioxidant, a light stabilizer, an antistatic agent, a lubricant, and an antiblocking agent, as necessary. May be added as long as the object of the present invention is not impaired.

  The high-pressure low-density polyethylene (b) constituting the present invention can be obtained by a conventionally known high-pressure radical polymerization method.

High-pressure low-density polyethylene (b) is excellent in heat insulating property and foam appearance, density in the range of 910~930kg / ^{m 3,} more preferably 914~926kg / ^{m 3,} more preferably 916~924kg / m ³ range. When the density of the high-pressure low-density polyethylene (b) is less than 910 kg / m ^3, it is not preferable because the foam appearance is inferior, and when it exceeds 930 kg / m ³ , it is not preferable because the heat insulating property is poor.

  The MFR of the high-pressure method low-density polyethylene (b) is preferably in the range of 10 to 30 g / 10 minutes because of excellent heat insulation and foam appearance, more preferably 12 to 30 g / 10 minutes, and still more preferably 13 It is in the range of ˜24 g / 10 minutes, most preferably 13 to 18 g / 10 minutes.

  The high-pressure low-density polyethylene (b) constituting the present invention may be blended with another polyolefin such as an ethylene / α-olefin copolymer.

  When the polyolefin is mixed with the high-pressure method low-density polyethylene (b) constituting the laminate of the present invention, the pellet mixture obtained by mixing the high-pressure method low-density polyethylene (b) pellets and the polyolefin pellets in a solid state may be used. Although a mixture obtained by melt-kneading with a single screw extruder, twin screw extruder, kneader, Banbury or the like is preferable, a product with stable quality can be obtained. When using a melt kneader, the melting temperature is preferably about the melting point of the polyolefin resin to about 300 ° C.

  In addition, the high-pressure low-density polyethylene (b) constituting the laminate of the present invention is generally used for polyolefin resins such as an antioxidant, a light stabilizer, an antistatic agent, a lubricant, and an antiblocking agent as necessary. The additives that have been used may be added within a range that does not impair the object of the present invention.

  The barrier coating agent (c) constituting the present invention is a liquid containing a barrier resin or an inorganic filler having an effect of improving gas barrier properties, and is not particularly limited as long as the object of the present invention is achieved. For example, as the commercially available barrier coating agent (c), “Ecostage GB7” manufactured by Sakata Inx Co., Ltd. “LG-OX Barrier Agent” manufactured by Tokyo Ink Co., Ltd., “TAKELAC WPB-341 manufactured by Mitsui Chemicals, Inc. "Maxive M-100" manufactured by Mitsubishi Gas Chemical Co., Ltd. and the like.

  The thickness of such a barrier coating agent (c) is not particularly limited as long as the object of the present invention is achieved, but is 0.2 to 2.0 μm because it is excellent in handling property, gas barrier property and economy. It is preferable that the thickness is 0.5 to 1.0 μm.

  The thickness before foaming of the layer (B) constituting the laminate of the present invention is not particularly limited as long as the object of the present invention is achieved, but is excellent in foaming properties and has few problems such as breakage. The thickness is preferably ˜100 μm, and the range of 20 to 50 μm is most preferable from the viewpoint of economy.

  The thickness of the layer (A) is not particularly limited as long as the object of the present invention is achieved, but is preferably in the range of 60 to 150 μm, more preferably 80 to 120 μm, and still more preferably, because of excellent foam appearance. 80-100 μm.

Although there is no limitation in particular about the paper base material which comprises the laminated body of this invention, since the expansion ratio of a high pressure method low density polyethylene (b) can be improved, the basic weight of a paper base material is 150-400 g / m. ² is more preferable, and 250 to 350 g / m ² is more preferable.

While such no particular limitation on the water contained in the paper substrate, such, since the improved expansion ratio of the thermoplastic resin is preferably from 20 to 40 g / m ^2, more preferably 20 to 35 g / m ² .

  As a method for obtaining the laminate of the present invention, a polyethylene-based resin (a) and a high-pressure low-density polyethylene (b) are subjected to extrusion laminating, coated with a barrier coating agent (c), and then heated and foamed. An example is a technique obtained by adhering the foam to be the layer (B) to paper, extrusion-laminating the polyethylene resin (a), and then coating the barrier coating agent (c). Since processing is easy, a technique obtained by tandem laminating the polyethylene resin (a) and the high-pressure low-density polyethylene (b), applying the barrier coating agent (c), and then heating and foaming is preferable. .

  Examples of the method for obtaining a laminate by an extrusion laminate molding method include various extrusion lamination methods such as a single lamination method, a tandem lamination method, a sandwich lamination method, and a coextrusion lamination method. The temperature of the resin in the extrusion laminating method is preferably in the range of 260 to 350 ° C, and the surface temperature of the cooling roll is preferably in the range of 10 to 50 ° C.

In addition, in the extrusion laminating process, when a method in which the base material adhesion surface of the layer is bonded to the base material by exposing the base material adhesion surface of the layer to the oxygen-containing gas or the ozone-containing gas immediately after forming the extruded layer in a molten state, It is preferable because of its excellent adhesiveness with the material layer. When the adhesiveness between the thermoplastic resin and the substrate is improved by the ozone-containing gas, the ozone gas treatment amount is 0.5 mg or more of ozone per 1 m ^{2 of the} film made of the thermoplastic resin extruded from the die. It is preferable to spray.

  The extrusion laminating method in the method of obtaining the laminate of the present invention by heat foaming further improves the adhesion between the thermoplastic resin layer and the base material layer, so that the polyethylene resin does not foam, for example, 30 ° C. Heat treatment can be performed at a temperature of ˜60 ° C. for 10 hours or more. Moreover, you may perform well-known surface treatments, such as a corona treatment, a flame treatment, and a plasma treatment, with respect to the adhesive surface of a paper base material as needed. If necessary, an anchor coating agent may be applied to the paper substrate.

  The method of applying such a barrier coating agent (c) is not particularly limited as long as the object of the present invention is achieved, and a gravure coating device, a bar coating device, a doctor coating device, a roll coating device, a blade coating. A technique using a device, a knife coater, etc. can be exemplified.

  As a method for obtaining the foam laminate of the present invention, water is applied to one or both sides of the paper substrate before laminating the polyethylene resin and the paper substrate layer in order to be excellent in heat insulation and economy of the foam laminate. May be.

  The method of applying moisture is not particularly limited as long as the object of the present invention is achieved, and examples thereof include methods using a roll coater, a lip coater, a spray device, a die coater, a gravure device, a dampening device, and the like. be able to. A method using a dampening device is preferable because the amount of water applied is uniform.

  Such a dampening apparatus includes, for example, a product name “High Rotor S” from Suzuki Sangyo Co., Ltd., a product name “WEKO Rotor Dampening” from Nikka Co., Ltd., and a trade name “Toko Electronics Co., Ltd.” "TSD-3000" is sold. In particular, it is preferable to use “High Rotor S” because there is no uneven application of water and the quality is stable.

The amount of water applied in the present invention is not particularly limited as long as the object of the present invention is achieved, but the expansion ratio of the high-pressure method low-density polyethylene (b) can be increased, and the paper base material and the polyethylene resin ( 2-30 g / m < ² > or less is preferable and 15-25 g / m < ² > or less is more preferable because the adhesive strength with a) and / or the high-pressure method low density polyethylene (b) does not decrease.

  The heat source for heating in the method of obtaining the laminate of the present invention by heat foaming is not particularly limited as long as this object is achieved, and in the laminate and the molded container, hot air, electric heat, electron beam, etc. can be exemplified. For example, in a container in which a body is molded, a high-temperature object is filled and the heat of the filling is used. Further, the heating method can be performed by a batch method in an oven, a continuous method using a conveyor, or the like.

Furthermore, the conditions such as the heating temperature and the heating time are not particularly limited as long as the object of the present invention is achieved. In general, when hot air is used as the heat source, the heating temperature is the high-pressure low density polyethylene (a). The melting point is 150 ° C. or less, the air volume is 0.5 to 2.0 m ³ / hour, and the heating time is 10 seconds to 6 minutes.

As such a heating condition, it is preferable that the water reduction rate constant k (min− ¹ ) satisfies the condition of 0.60 to 1.30, more preferably 0.65 to 1. 30, most preferably from 0.80 to 1.10.

This water reduction rate constant k (min− ¹ ) is a water change amount dW / dt per unit time in a heating time t (min) in the step of foaming the high-pressure method low density polyethylene (b). It is a proportionality constant in the first-order velocity equation represented by the following equation (1), which is a relational expression with the moisture concentration W in the paper substrate at the heating time t (minutes).

dW / dt = −kW (1)
Specifically, the water reduction rate constant k (min− ¹ ) is laminated in the order of paper base / polyethylene resin, the density of the polyethylene resin is 940 kg / m ³ , and the thickness of the polyethylene resin is 40 μm. It can obtain | require using the weight change at the time of the heating of a certain laminated body. Derived from weight loss ΔW _t (g / m ² ) per unit area after heating at a certain time t (min) obtained when heat-treating a laminate comprising paper base material / polyethylene resin and formula (1) The weight loss ΔW _{t, cal} (g / m ² ) per unit area at a certain time t (minute) obtained by calculating the following equation (2) is 0.5 to 6 every 0.5 minutes. When calculating up to minutes, the water decrease rate constant k (minutes) so that the total value from 0.5 minutes to 6 minutes of the error ε _t at a certain time t (minutes) expressed by the following equation (3) is minimized. ^-1 ).

ΔW _{t, cal} = W ₀ [1-exp (−kt)] (2)
ε _t = [(ΔW _t −ΔW _{t, cal} ) / ΔW _t ] ² (3)
Here, W ₀ is the moisture content (g / m ² ) per unit area before heating in the paper base material / polyethylene resin.

  About the laminated body of this invention, since it is excellent in heat insulation, 700 micrometers or more are preferable for the total of the thickness of a foam layer, More preferably, it is 800 micrometers or more, Most preferably, it is 900 micrometers or more.

  In the laminate of the present invention, the (A) layer is disposed at least adjacent to the paper base material layer, and the (B) layer which is a foam layer adjacent to the paper base material on the surface of the other paper base material ( The (C) layer is arranged on the outer surface from the B) layer, and the (B) layer and the (C) layer may be adjacent to each other or may not be adjacent to each other. Moreover, it may contain not only what consists only of 4 components of (A) layer, a paper base material, (B) layer, and (C) layer but other components, for example, (D) layer. Specifically, (A) layer / paper substrate / (B) layer / (C) layer, (A) layer / paper substrate / (B) layer / (A) layer / (C) layer, (A ) Layer / paper substrate / (B) layer / (C) layer / (A) layer, (A) layer / (A) layer / paper substrate / (B) layer / (C) layer, (B) layer / (A) layer / paper substrate / (B) layer / (C) layer, (A) layer / paper substrate / (B) layer / (C) layer / (B) layer, (C) layer / ( A) layer / paper substrate / (B) layer / (C) layer, (A) layer / paper substrate / (B) layer / (C) layer / (D) layer, (A) layer / paper substrate / (B) layer / (D) layer / (C) layer, (D) layer / (A) layer / paper substrate / (B) layer / (C) layer, (A) layer / paper substrate / ( B) layer / (D) layer / (B) layer / (C) layer, (A) layer / paper substrate / (B) layer / (C) layer / (D) layer / (C) layer, (B ) Layer / (A) layer / paper substrate / (B) layer / (D) layer / (A) layer / (C) layer There are exemplified.

  Examples of the layer (D) include a layer formed from a synthetic polymer, a woven fabric, a nonwoven fabric, a metal foil, papers, cellophane, and the like. For example, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins such as nylon 6 and nylon 66, high density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-ethyl acrylate copolymer, ethylene- Methacrylic acid copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyethylene resin such as ionomer, polypropylene resin, polybutene, acrylic resin, polyvinyl alcohol, polymethylpentene, polyvinyl chloride, Examples thereof include a layer formed from a synthetic polymer such as polyvinylidene chloride, polystyrene, polycarbonate, polyurethane, and cellulose resin. Further, these polymer films and sheets may be further subjected to aluminum vapor deposition, alumina vapor deposition, silicon dioxide vapor deposition, or acrylic treatment. Further, these polymer films and sheets may be further printed using urethane ink or the like. Examples of the metal foil include aluminum foil and copper foil, and examples of paper include kraft paper, fine paper, stretched paper, glassine paper, paperboard such as base paper for cups and photographic paper.

  The foam laminate of the present invention is a foam laminate having a large thickness of the foam layer, showing good heat insulation and excellent gas barrier properties.

Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to these.
(1) Density Density was measured based on JIS K6922-1 (2011).
(2) Melt mass flow rate (MFR)
MFR was measured according to JIS K6922-1 (2011).
(3) Heat-foaming Gear type aging tester (No. 102-SHF-77 manufactured by Yasuda Seiki Seisakusakusho Co., Ltd.) obtained by heating a sample obtained by cutting the laminate obtained in the example into 10 cm × 20 cm and forming it into a cylindrical shape. ) Was left standing for a predetermined time while applying hot air, and then taken out and cooled in air to room temperature. Further, the air volume during heating was set to “HIGH” of the “AGING” button.
(4) Water content of paper base material The paper base material before lamination of the polyethylene resin was measured by using a Karl Fischer method water measuring device (trade name CA-05, manufactured by Mitsubishi Chemical Corporation). The measurement temperature is 165 ° C.
(5) Foam Layer Thickness Samples were taken of the foam obtained in the examples and the laminate laminate before foaming as a blank, and a cross-sectional photograph was taken with an optical microscope. The thickness of the foam layer was measured from the cross-sectional photograph and measured at five locations.
(6) Oxygen permeability Using the laminate before foaming obtained in the examples, it was measured according to JIS K7126 A method using a differential pressure type gas permeation tester (manufactured by Toyo Seiki Seisakusho). .

Example 1
As the resin for the layer (A), a high-density polyethylene (trade name Petrocene LW04-1 manufactured by Tosoh Corp.) (A1) having an MFR of 7 g / 10 min and a density of 940 kg / m ³ is used. As a coating agent for the (C) layer, Ecostage GB7 was prepared by using high pressure method low density polyethylene (trade name Petrocene 212 manufactured by Tosoh Corporation) (B1) having an MFR of 13 g / 10 min and a density of 918 kg / m ^3. (Sakata Inx Co., Ltd.) (C1) was used.

First, (A1) is supplied to a single-screw extrusion laminator (manufactured by Musashinokikai Co., Ltd.) having a screw having a diameter of 90 mmφ, extruded from a T die at a temperature of 320 ° C., has a water content of 24 g / m ² , and has a basis weight of 320 g. / ^m take-off speed on the ² a is a paper substrate is 60 m / min, was extrusion lamination molding to air gap length a thickness of 40μm at 130 mm. Furthermore, (B1) was supplied to a single screw extruder (manufactured by Musashinokikai Co., Ltd.) having a screw with a diameter of 90 mmφ, at a temperature of 320 ° C., a take-up speed of 60 m / min, and an air gap length of 130 mm, (B1) After extruding to a thickness of 70 μm, the surface of the layer (B) was subjected to a corona treatment under the condition of 83 W · min / m ² . The obtained laminate was cut into 30 cm × 40 cm and subjected to corona treatment on the surface of the (B) layer, bar coater No. 6 (manufactured by Yasuda Seiki Seisakusho Co., Ltd.) was used to laminate (C1) so that the film thickness after drying was 0.4 μm. A laminate obtained by laminating B1) and the barrier coating agent (C1) in this order was obtained. The obtained laminate was foamed by heating at 120 ° C. and an air volume of HIGH for 5 minutes to obtain a foam laminate. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Example 2
(B) On the surface of the layer, a bar coater No. 12 (manufactured by Yasuda Seiki Seisakusho Co., Ltd.) was used to obtain a laminate before and after foaming by the same method as in Example 1 except that (C1) was laminated so that the film thickness after drying was 0.8 μm. It was. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Example 3
(B) On the surface of the layer, a bar coater No. 24 (made by Yasuda Seiki Seisakusho Co., Ltd.) was used to obtain a laminate before and after foaming by the same method as in Example 1 except that (C1) was laminated so that the film thickness after drying was 1.6 μm. It was. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Example 4
(C) LG-OX barrier agent (manufactured by Tokyo Ink Co., Ltd.) (C2) was used as the barrier coating agent for the layer, and the bar coater No. 6 was used to obtain a laminate before and after foaming by the same method as in Example 1, except that (C2) was laminated so that the film thickness after drying was 0.3 μm. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Example 5
(A) As a resin of the layer, 90% by weight of high density polyethylene (trade name Nipolon Hard 2000 manufactured by Tosoh Corporation) having an MFR of 21 g / 10 min and a density of 952 kg / m ³ and MFR of 1.6 g / 10 min The high-pressure low-density polyethylene having a density of 919 kg / m ³ (trade name Petrocene 360 manufactured by Tosoh Corporation) was blended to 10% by weight, and a single-screw extruder (Placo Corporation diameter 50 mm) was used. A laminate before and after foaming was obtained in the same manner as in Example 1 except that the melt-kneaded ethylene resin composition (A2, MFR 16 g / 10 min, density 949 kg / m ³ ) was used. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Example 6
(A) As a resin of the layer, 90% by weight of high-density polyethylene (trade name Nipolon Hard 1000 manufactured by Tosoh Corporation) having an MFR of 20 g / 10 min and a density of 966 kg / m ³ , and MFR of 1.6 g / 10 min The high-pressure low-density polyethylene having a density of 919 kg / m ³ (trade name Petrocene 360 manufactured by Tosoh Corporation) was blended to 10% by weight, and a single-screw extruder (Placo Corporation diameter 50 mm) was used. A laminate before and after foaming was obtained in the same manner as in Example 1 except that the melt-kneaded ethylene resin composition (A3, MFR 16 g / 10 min, density 961 kg / m ³ ) was used. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 1.

Comparative Example 1
(C) The laminated body before and behind foaming was obtained by the same method as Example 1 except not having laminated | stacked a layer. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 2. The oxygen permeability was inferior.

Comparative Example 2
(C) The laminated body before and behind foaming was obtained by the same method as Example 5 except not having laminated | stacked a layer. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 2. The oxygen permeability was inferior.

Comparative Example 3
(C) A laminate before and after foaming was obtained in the same manner as in Example 6 except that the layer was not laminated. About the obtained laminated body before and behind foaming, the thickness and oxygen permeability of the foamed layer were evaluated. The evaluation results are shown in Table 2. The oxygen permeability was inferior.

  The foamed laminate of the present invention is suitably used for containers that require heat insulation, such as paper containers for high-temperature beverages such as coffee and soup, and containers for instant foods such as instant noodles.

Claims (7)

The (A) layer is disposed at least adjacent to the paper base material layer, and on the other paper base surface, the foam layer adjacent to the paper base material (B) layer and the outer surface from the (B) layer ( C) A foamed laminate in which layers are arranged, and the (A) layer is a polyethylene resin having a density measured by JIS K6922-1 (2011) of 935 kg / m ³ or more and 970 kg / m ³ or less ( a), (B) layer is JIS K6922-1 (density measured by 2011) is 910 kg / ^{m 3} or more 930 kg / ^{m 3} or less is high-pressure low-density polyethylene (b), (C) layer gas barrier properties A foam laminate comprising the coating agent (c). (C) The thickness of a layer is 0.2 micrometer or more and 2.0 micrometers or less, The foaming laminated body of Claim 1 characterized by the above-mentioned. Polyethylene resin (a) The foam laminate according to claim 1 or 2 in which the density measured by JIS K 6922-1 (2011 years) is equal to or less than 945 kg / ^{m 3} or more 970 kg / ^{m 3} body. Foam laminate according to claim 3 in which the polyethylene resin (a) is the density measured by JIS K 6922-1 (2011 years) is characterized in that it is 950 kg / ^{m 3} or more 965 kg / ^{m 3} or less. Polyethylene resin (a) is high-density polyethylene (c) 10 to 90% by weight, and high-pressure low-density polyethylene (d) 10 to 90% by weight (the total of (c) and (d) is 100% by weight). The foamed laminate according to any one of claims 1 to 4, which is an ethylene-based resin composition (e). The foam laminate according to any one of claims 1 to 5, wherein the basis weight of the paper substrate is 150 g / m ² or more and 400 g / m ² or less. The container which consists of a foaming laminated body in any one of Claims 1-6.