JP6958030B2 - A packaging material composed of a low-odor laminate and the laminate, and a method for manufacturing the laminate. - Google Patents

Description

The present invention relates to a laminate having excellent low odor and a method for producing the laminate.

The laminate according to the present invention is a laminate in which the odor emitted from the laminate itself is reduced, and the odor is mainly heat deterioration of the heat-sealing resin, which is a component of the sealant layer, at the time of producing the laminate. It is derived from the odor that was generated by the above and remained in the laminate.

The low odor laminate of the present invention can be applied to products in various fields that require low odor. For example, it can be used for packaging products, electric / electronic products such as solar cells, organic light emitting diodes, wavelength conversion sheets, and display devices, and as a packaging material for applications such as pharmaceuticals, cosmetics, chemicals, and foods and drinks. It can be used particularly preferably.

A resin film using a resin having a specific density and a low volatile component amount in order to obtain low odor in a resin film laminate is known, but it requires a special raw material and further has a resin composition. Since a special processing facility such as heating an object under reduced pressure to remove volatile components is required, there is a problem such as cost due to the introduction of the device. (Patent Document 1)

Japanese Patent No. 4752219

The present invention relates to a laminate including a layer composed of an inflation-formed film, and in particular, a laminate including a base material layer and a sealant layer, and the sealant layer including a layer composed of an inflation-formed film. In the production of a low odor laminate having a reduced odor emitted from the laminate itself and having excellent laminate properties and heat sealability, a packaging material made of the low odor laminate, and further, the low odor laminate. It provides a method.

The present inventors have studied diligently to solve the above problems, and the low-odor laminate having a sealant layer formed by the inflation method of the present invention is used to deodorize the sealant layer with hydrophobic zeolite powder. It has been found that a low odor laminate can be obtained by containing a deodorant-containing layer containing an agent and a heat-sealing resin-containing film.

The present invention is characterized by the following points.
1. 1. A low-odor laminate having a base material layer and a sealant layer.
The sealant layer contains one layer or two or more heat-sealing resin-containing films formed by inflation, and at least one layer is a deodorant-containing sealant layer containing a powder deodorant.
The powder deodorant is a hydrophobic zeolite and is
The odor of the low odor laminate is the odor generated from the heat-sealing resin during the inflation film formation.
Low odor laminate.
2. The low odor laminate according to 1 above, wherein the heat-sealing resin is a polyolefin-based resin.
3. 3. 2. The low density resin according to 2 above, wherein the polyolefin resin is one or more selected from the group consisting of low density polyethylene, linear low density polyethylene, medium density polyethylene, random polypropylene, homopolypropylene, and block polypropylene. Odor laminate.
4. The low odor laminate according to 3 above, wherein the odor is a polyethylene odor or a polypropylene odor.
5. The low odor laminate according to any one of 1 to 4 above, wherein the hydrophobic zeolite has an average particle size of 1 to 10 μm.
6. The low odor laminate according to any one of 1 to 5 above, wherein the hydrophobic zeolite is a high silica zeolite having a silica / alumina mass ratio of 5 to 2000.
7. The deodorant-containing layer contains a deodorant masterbatch.
The low odor laminate according to any one of 1 to 6 above, wherein the deodorant masterbatch contains the powder deodorant and a thermoplastic resin.
8. The low odor laminate according to 7 above, wherein the content of the powder deodorant in the deodorant masterbatch is 10 to 60% by mass.
9. The low odor laminate according to any one of 1 to 8 above, wherein the content of the powder deodorant in the deodorant-containing layer is 0.1 to 20% by mass.
10. The low odor laminate according to any one of 1 to 8 above, wherein the content of the powder deodorant per unit area of the low odor laminate is 0.1 to 10 g / m2.
11. The low odor laminate according to any one of 1 to 10 above, wherein the sealant layer is laminated on the low odor laminate by dry lamination or lamination via a melt-extruded adhesive layer.
12. A low odor packaging material comprising the low odor laminate according to any one of 1 to 11 above.
13. The method for producing a low-odor laminate according to any one of 1 to 11 above, which comprises at least the steps a) to d) below.
a) A step of preparing the deodorant masterbatch by melt-blending the powder deodorant and the thermoplastic resin.
b) A step of dry-blending the deodorant masterbatch and the heat-sealing resin to prepare a deodorant layer composition.
c) A step of inflating the deodorant composition to prepare a film for a sealant layer.
d) A step of laminating the sealant layer film on a laminate by dry lamination or by lamination via a melt-extruded adhesive layer.

According to the present invention, the sealant layer contains a deodorant-containing layer containing a powder deodorant while using a normal heat-sealing resin for the sealant layer without using a special resin raw material or apparatus. Therefore, it is possible to provide a low odor laminate in which the release of odor generated from the heat-sealing resin during inflation film formation and remaining in the laminate is reduced.

The low odor laminate of the present invention can be applied to products in various fields. For example, it can be used for packaging products, electric / electronic products such as solar cells, organic light emitting diodes, wavelength conversion sheets, and display devices, and in particular, has low odor properties such as pharmaceuticals, cosmetics, chemicals, and foods and drinks. It can be suitably used for applications as packaging materials that are strictly required.

It is a schematic cross-sectional view which shows one aspect of the layer structure of the low odor laminate which concerns on this invention. It is a schematic cross-sectional view which shows one aspect of the layer structure of the low odor laminate which concerns on this invention. It is a schematic cross-sectional view which shows one aspect of the layer structure of the low odor laminate which concerns on this invention.

The present invention will be described in more detail below with reference to drawings and the like. Hereinafter, the resin names used in the present specification will be those commonly used in the industry. Moreover, the present invention is not limited to the specific examples described. Further, the film and the sheet are collectively referred to as a film.

<Layer structure of the low odor laminate of the present invention>
FIG. 1 is a schematic cross-sectional view showing an aspect of the layer structure of the low odor laminate of the present invention. As shown in FIG. 1, in the low odor laminate of the present invention, at least one base material layer and two sealant layers containing a powder deodorant are laminated. In some cases, it may be laminated via an adhesive layer.

The low odor laminate of the present invention is a laminate in which the sealant layer includes a layer made of an inflation-formed heat-sealing resin-containing film and a deodorant-containing layer containing a powder deodorant. , The layer made of the heat-sealing resin-containing film formed by inflation may be the deodorant-containing layer.

FIG. 2 is a schematic cross-sectional view showing an aspect of the layer structure of the low odor laminate of the present invention. As shown in FIG. 2, the low odor laminate of the present invention contains 1 base material layer, 2a sealant layer a not containing a powder deodorant, and 2b a sealant containing a powder deodorant. The layer b is laminated. Each layer may be laminated with an adhesive layer in some cases.

FIG. 3 is a schematic cross-sectional view showing an aspect of the layer structure of the low odor laminate of the present invention. As shown in FIG. 3, in the low odor laminate of the present invention, a functional material layer is laminated between 1 base material layer and 2 a sealant layer containing a powder deodorant. ..

Each layer of the low odor laminate of the present invention may be laminated with another layer via an adhesive layer by dry lamination, non-solvent lamination, sand lamination or the like, or is laminated together with the other layer by melt extrusion lamination. Of course, it is preferable to laminate by dry lamination or melt extrusion lamination, and in particular, the sealant layer is laminated on the low odor laminate by dry lamination or lamination via the melt-extruded adhesive layer. Is preferable.

(Odor)
In the present invention, the odor is emitted from the laminate, and the heat-sealing resin mainly contained in the sealant layer is thermally deteriorated by heating during the production of the laminate, especially during the inflation film formation of the sealant layer. Was generated and remained in the laminated body.

The odor is generally called, for example, polyethylene or polypropylene odor when polyethylene or polypropylene is used for the sealant layer, and is perceived as an offensive odor by humans, and is perceived by humans as an offensive odor from the packaging material or packaging body. When it is released or the odor is transferred to the contents of the package, it adversely affects the commercial value of the packaging material and the package.

In the present invention, it is possible to obtain a highly efficient deodorizing effect by providing a deodorant-containing layer in the sealant layer which is an odor generating source.

[Base layer]
Examples of those that can be used for the base material layer include uniaxially or biaxially stretched plastic films. Specific examples of the uniaxial or biaxially stretched plastic film include uniaxial or biaxially stretched polyester film such as polyethylene terephthalate and polyethylene naphthalate, and uniaxial or biaxial such as nylon 6, nylon 66 and MXD6 (polymethoxylylen adipamide). Examples thereof include a stretched polyamide film and a biaxially stretched polypropylene film OPP.

Further, it is also possible to use the above film by depositing an inorganic compound or an inorganic oxide on the film, and specific examples thereof include transparent vapor deposition such as silica vapor deposition and alumina vapor deposition.

The thickness of the base material layer can be arbitrarily selected, but from the viewpoint of moldability and transparency, it is preferable to select and use from the range of 1 to 300 μm, and the range of 1 to 100 μm is more preferable. If it is thinner than this, the strength tends to be insufficient, and if it is thicker than this, the rigidity becomes too high and processing tends to be difficult.

Further, in order to improve the adhesion, the base material layer is subjected to a low temperature using corona discharge treatment, ozone treatment, oxygen gas, nitrogen gas or the like in advance on the surface of the base material layer before laminating or vapor deposition, if necessary. Physical treatments such as plasma treatment and glow discharge treatment, chemical treatments such as oxidation treatment using chemicals, adhesive layer, primer coating agent layer, undercoat layer, vapor deposition anchor coating agent layer, etc. And other treatments may be performed. The same applies to the adhesion between the layers in the base material layer when the base material layer is prepared.

As the base material layer film, for example, one kind or two or more kinds of resins selected from the above-mentioned resin group are used, and conventionally used such as extrusion method, cast molding method, T-die method, cutting method, inflation method and the like have been used. It can be produced by a film-forming method, or by a multi-layer co-extrusion film-forming method using two or more kinds of resins. Further, from the viewpoint of film strength, dimensional stability, and heat resistance, the film can be stretched in the uniaxial or biaxial directions by using, for example, a tenter method or a tubular method.

The base material layer film may be processed, heat resistant, weather resistant, mechanical properties, dimensional stability, antioxidant, slippery, mold releasable, flame retardant, antifungal, and electrical, if necessary. Plastic compounding agents and additives such as lubricants, cross-linking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, etc. for the purpose of improving and modifying properties, strength, etc. Can be added, and the amount of the addition can be arbitrarily added according to the purpose as long as it does not adversely affect other performance.

[Functional material layer]
In the low-odor laminate of the present invention, the functional material layer is a layer that exhibits a special function and is included in the laminate as needed. Specifically, a light-shielding layer, a gas barrier layer, a printing layer, and the like are used. Can be mentioned.

A resin film on which an inorganic compound or an inorganic oxide is vapor-deposited, a metal foil, a coating film of a resin having a special function, a resin film on which a pattern is printed, or the like can be used as a functional material layer.

Here, as the resin film used, it is possible to use the same resin film as the resin film used for the base material layer, and further, the same plastic compounding agent, additive, etc. can be used for other performances. It can also be added in an arbitrary amount depending on the purpose as long as it does not adversely affect the substance.

As the resin film, for example, one kind or two or more kinds of resins selected from the same group of resins as the resin for the resin film of the base material layer are used, and the extrusion method, the cast molding method, the T-die method, the cutting method, etc. It can be produced by a conventionally used film-forming method such as an inflation method, or by a multi-layer coextrusion film-forming method using two or more kinds of resins. Further, from the viewpoint of film strength, dimensional stability, and heat resistance, the film can be stretched in the uniaxial or biaxial directions by using, for example, a tenter method or a tubular method.

Further, in order to improve the adhesion, the functional material layer is physically or chemically treated or adhered to the surface of the functional material layer before laminating or vapor deposition, as in the case of the base material layer, if necessary. A treatment for forming an agent layer, a primer coating agent layer, an undercoat layer, a vapor deposition anchor coating agent layer, or the like, and other treatments may be performed. The same applies to the adhesion between the layers in the functional material layer when the functional material layer is produced.

[Adhesive layer]
In the low odor laminate of the present invention, the adhesive layer is a layer contained in the laminate, for example, a layer for adhering a base material layer and a sealant layer, which are known and publicly available. Can be used. Specific examples thereof include melt-extruded resins and two-component curable urethane adhesives.

[Sealant layer]
The sealant layer in the low odor laminate of the present invention is a layer having heat-sealing property and deodorizing property, includes one layer or two or more layers of insulation-formed heat-sealing resin-containing films, and At least one layer contains a deodorant-containing layer containing a powder deodorant.

Here, the layer made of the inflation-formed heat-sealing resin-containing film may be a deodorant-containing layer containing a powder deodorant, and the sealant layer may contain a deodorant. It may have a multi-layer structure including a heat-sealing resin layer other than the layer and which does not contain a deodorant.

Furthermore, the deodorant-containing layer or the heat-sealing resin layer containing no deodorant may have a multilayer structure having the same or different composition, respectively, and the stacking order may be arbitrary, but the deodorant-containing layer Is preferably the outermost surface.

The sealant layer film, which is an inflation-formed heat-sealable resin-containing film, is preferably laminated on the laminate by dry lamination, or laminated on the laminate via a melt-extruded adhesive layer. .. Further, when the sealant layer has a multi-layer structure, it is also possible to have a melt-extruded and laminated layer in the sealant layer.

The thickness of the sealant layer is preferably 5 to 100 μm, more preferably 10 to 70 μm, and most preferably 20 to 40 μm. If it is thinner than the above range, it tends to be difficult to obtain sufficient laminating strength even if heat-sealed, and if it is thicker than the above range, the cost tends to increase and the laminated body tends to become hard and workability deteriorates.

The thickness of the deodorant-containing layer is preferably 5 to 100 μm, more preferably 10 to 70 μm, and most preferably 20 to 40 μm, including the case where the entire sealant layer is a deodorant-containing layer. If it is thinner than the above range, it becomes difficult to obtain a sufficient deodorizing effect, and if it is thicker than the above range, the cost increases and the laminate becomes hard and workability deteriorates.

The heat-sealing resin contained in the deodorant-containing layer and the heat-sealing resin contained in the heat-sealing resin layer not containing the deodorant are different resins even if they are the same resin. Also, any one having an MFR applicable to the inflation method may be used.

(Heat sealable resin)
A preferred specific example of the heat-sealing resin is a polyolefin-based resin.

Specific examples of the polyolefin resin include random polypropylene, block polypropylene, homopolypropylene and other polypropylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE). ), Etc., and one or more of these may be selected and mixed for use. Among them, linear low-density polyethylene, low-density polyethylene and the like are preferably used.

The melt flow rate (MFR) of the heat-sealing resin is preferably 0.1 to 5.0 g / 10 minutes, more preferably 0.2 to 4.5 g / 10 minutes, and 0.3 to 4.0 g / 10 minutes. Is particularly preferable. In this specification, MFR is a value measured by a method based on JIS K7210.

When the MFR is out of the above range, it tends to be inferior in terms of processing suitability. If the MFR is smaller than the above range, it is difficult to heat-seal with sufficient pressure, so that the heat-seal strength tends to be unstable. If the MFR is larger than the above range, it is difficult to form a film by the inflation method.

(Powder deodorant)
The powder deodorant contained in the deodorant-containing layer is preferably contained via a deodorant masterbatch in which the powder deodorant is melt-blended. Specifically, a powder deodorant is melt-blended with a thermoplastic resin at a relatively high concentration to prepare a deodorant masterbatch, and then the deodorant is adjusted to a desired deodorant concentration. The masterbatch and the above heat-sealing resin are dry-blended and used.

The thermoplastic resin melt-blended into the deodorant masterbatch may be the same as the above heat-sealing resin, may not be the same, or may be a resin having no heat-sealing property.

Specific examples of the preferred thermoplastic resin to be melt-blended include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, and the like, and even if these are used alone, they may be used alone. Two or more types may be used in combination.

As the powder deodorant, hydrophobic zeolite is preferable, high silica zeolite is more preferable among hydrophobic zeolites, and among high silica zeolites, those having a silica / alumina mass ratio of 5 to 2000 are more preferable, and 20 to 20 to 20. Those of 1000 are even more preferable, and those of 50 to 500 are particularly preferable. Specific examples of the hydrophobic zeolite include zeolite 3A, zeolite 4A, zeolite 5A, zeolite 13X and the like.

The average particle size of the powder deodorant is preferably 1 to 10 μm, more preferably 2 to 6 μm. If it is smaller than the above range, the thixotropic property at the time of melting becomes too high, and the inflation film-forming property and the heat-sealing product tend to deteriorate. If it is larger than the above range, the effective specific surface area of the powder deodorant becomes too small, the deodorizing effect tends to decrease, and the film surface smoothness tends to decrease.

The content of the powder deodorant in the deodorant masterbatch is preferably 10 to 60% by mass, more preferably 20 to 50% by mass. Within the above range, it is easy to contain a necessary and sufficient amount of the deodorant in the deodorant layer in a dispersed state.

Commercially available high silica that satisfies the above silica / alumina mass ratio and average particle size is
HSZ-960HOA (manufactured by Toso Co., Ltd., silica / alumina mass ratio 100, average particle size 4 μm), HSZ-980HOA (manufactured by Toso Co., Ltd., silica / alumina mass ratio 500, average particle size 2.5 μm). ), HSZ-385HUA (manufactured by Toso Co., Ltd., silica / alumina mass ratio 100, average particle size 2.5 μm), HSZ-390HUA (manufactured by Toso Co., Ltd., silica / alumina mass ratio 500, average particle size) 6 μm.) Etc.

The content of the deodorant masterbatch in the sealant layer is preferably 0.5 to 30% by mass, more preferably 1 to 20% by mass, and particularly preferably 2 to 15% by mass.

The content of the deodorant masterbatch in the deodorant-containing layer is preferably 1 to 30% by mass, more preferably 2 to 25% by mass, and particularly preferably 3 to 15% by mass.

The content of the powder deodorant in the deodorant-containing layer is preferably 0.1 to 20% by mass, more preferably 1 to 15% by mass. If it is less than the above range, it tends to be difficult to contain a powder deodorant capable of exhibiting a sufficient deodorizing effect in the laminate, and if it is more than the above range, the thixo property at the time of melting becomes high. As a result, the inflation film-forming property and the heat-sealed product tend to deteriorate, and the surface smoothness of the deodorant layer tends to decrease.

The content of the powder deodorant per unit area of the laminate is preferably 0.1 to 10 g / m2, more preferably 0.15 to 7 g / m2. If it is less than the above range, it tends to be difficult to exhibit a sufficient deodorizing effect, and if it is more than the above range, the deodorant-containing layer and the sealant layer become too thick, or in the deodorant-containing layer. The content of the powder deodorant in the above tends to be too high, and the balance of the performance as a laminate tends to be poor.

The present invention will be specifically described with reference to examples.

<Details of various raw materials>
PET1: Biaxially stretched PET film manufactured by Toyobo Co., Ltd., E5100. 12 μm thick, single-sided corona treated.
AC coating agent: A3210 / A3075, manufactured by Mitsui Chemicals, Inc., a two-component curable urethane-based anchor coating agent.
LDPE1: Low density polyethylene manufactured by Japan Polyethylene Corporation, LC600A. MFR 7.0g / 10 minutes.
LDPE2: Low-density polyethylene manufactured by Japan Polyethylene Corporation, Novatec LC522. MFR 4.0g / 10 minutes.
LLDPE3: Linear low-density polyethylene manufactured by Prime Polymer Co., Ltd., SP2020. MFR 2.3g / 10 minutes.
LLDPE4: Linear low-density polyethylene manufactured by Prime Polymer Co., Ltd., SP1070C. MFR 10g / 10 minutes.
Aluminum foil 1: Aluminum foil manufactured by Toyo Aluminum Co., Ltd., 8079 foil, 7 μm thick.
Deodorant Masterbatch 1: Powder deodorant manufactured by Toyo Ink Co., Ltd., PEX-CLT-73 AL. Powder deodorant content 30% by mass. The powder deodorant has a silica / alumina mass ratio of 300, an average particle size of 5 μm, and a pore size of 4 Å. Containing resin type LDPE (MFR 7 g / 10 minutes).
Powder deodorant 2: HSZ-385HUA manufactured by Tosoh Corporation. Silica / alumina mass ratio of about 100, average particle size 2.5 μm, pore size 9 Å.
Powder deodorant 3: HSZ-960HOA manufactured by Tosoh Corporation. Silica / alumina mass ratio of about 100, average particle size 4 μm, pore size 6.5 Å.
Powder deodorant 4: HSZ-980HOA manufactured by Tosoh Corporation. Silica / alumina mass ratio of about 500, average particle size 2.5 μm, pore size 6.5 Å.
Powder deodorant 5: HSZ-390HUA manufactured by Tosoh Corporation. Silica / alumina mass ratio of about 500, average particle size 6 μm, pore size 9 Å.

[Example 1]
The following raw materials were dry-blended to obtain LLDPE mixture 1.
Deodorant Masterbatch 15 parts by mass LLDPE3 95 parts by mass

Next, using LDPE2 and LLDPE mixture 1, inflation film formation was performed at 150 ° C. so that the layer structure was LDPE2 (10 μm) / LDPE2 (10 μm) / LLDPE mixture 1 (20 μm) and the total thickness of the multilayer layers was 40 μm. An inflation film 1 for the sealant layer was obtained.

Then, the following laminating was carried out using a melt extrusion laminating machine.

The corona surface of PET1 was coated with an AC coating agent, and the aluminum foil 1 was laminated via melt-extruded LDPE1. Next, the non-laminated surface of the laminated aluminum foil 1 was coated with an AC coating agent and bonded to the inflation film 1 via the melt-extruded LDPE 1 to obtain a laminated body. The evaluation results are shown in Table 1.

The layer structure of the obtained laminate is as follows.
PET1 (12 μm) / AC (3 g / m ² ) / LDPE1 (15 μm) / Aluminum foil 1 (7 μm) / AC (3 g / m ² ) / LDPE1 (15 μm) / Inflation film 1 (40 μm)

[Example 2]
The same operation as in Example 1 was carried out except that the thickness of the layer of the LLDPE mixture 1 was changed to 10 μm and the total thickness of the multilayer layers was changed to 30 μm to obtain an inflation film 2 and a laminate, which were evaluated in the same manner.

[Example 3]
The following was dry blended to give the LLDPE mixture 2.
Deodorant Masterbatch 1 10 parts by mass LLDPE4 90 parts by mass

Then, the following laminating was carried out using a melt extrusion laminating machine.

The corona-treated surface of PET2 was coated with an AC coating agent, dried at 90 ° C., and the coated surface and the aluminum foil 2 were laminated via LDPE2 melt-extruded at 330 ° C.

The non-laminated surface of the laminated aluminum foil 2 is coated with an AC coating agent, and then an inflation film 2 for a sealant layer is formed at 150 ° C. using the LLDPE mixture 2 so as to form a film having a thickness of 30 μm. , 290 ° C. was laminated on the AC coating agent surface to obtain a laminated body. The evaluation results are shown in Table 1.

The layer structure of the obtained laminate is as follows.
PET2 (12 μm) / AC (3 g / m ² ) / LDPE2 (15 μm) / Aluminum foil 2 (7 μm) / AC (3 g / m ² ) / LLDPE mixture 2 (30 μm)

[Example 4]
The following was dry blended to give the LLDPE mixture 3.
Deodorant Masterbatch 1 20 parts by mass LLDPE4 80 parts by mass

Next, the inflation film 3 was formed into a film by the same operation as in Example 3 except that the LLDPE mixture 3 was used instead of the LLDPE mixture 2, and a laminate was obtained and evaluated in the same manner.

[Example 5]
The following raw materials were melt-blended to obtain a deodorant masterbatch 2.
Powder deodorant 2 20 parts by mass LDPE1 80 parts by mass

The following was then dry blended to give the LLDPE mixture 4.
Deodorant Masterbatch 2 20 parts by mass LLDPE4 80 parts by mass

Then, the inflation film 4 was formed in the same manner as in Example 3 except that the LLDPE mixture 4 was used instead of the LLDPE mixture 2, and a laminate was obtained and evaluated in the same manner.

[Example 6]
The following raw materials were melt-blended to obtain a deodorant masterbatch 3.
Powder deodorant 3 50 parts by mass LDPE1 50 parts by mass

The following was then dry blended to give the LLDPE mixture 5.
Deodorant Masterbatch 3 25 parts by mass LLDPE4 75 parts by mass

Then, the inflation film 5 was formed into a film by the same operation as in Example 3 except that the LLDPE mixture 5 was used instead of the LLDPE mixture 2, and a laminate was obtained and evaluated in the same manner.

[Example 7]
The following raw materials were melt-blended to obtain a deodorant masterbatch 4.
Powder deodorant 4 30 parts by mass LDPE1 70 parts by mass

The following was then dry blended to give the LLDPE mixture 6.
Deodorant Masterbatch 4 10 parts by mass LLDPE4 90 parts by mass

Then, the inflation film 6 was formed into a film by the same operation as in Example 3 except that the LLDPE mixture 6 was used instead of the LLDPE mixture 2, and a laminate was obtained and evaluated in the same manner.

[Example 8]
The following raw materials were melt-blended to obtain a deodorant masterbatch 5.
Powder deodorant 5 30 parts by mass LDPE1 70 parts by mass

The following was then dry blended to give the LLDPE mixture 7.
Deodorant Masterbatch 5 10 parts by mass LLDPE4 90 parts by mass

Then, the inflation film 7 was formed into a film by the same operation as in Example 3 except that the LLDPE mixture 7 was used instead of the LLDPE mixture 2, and a laminate was obtained and evaluated in the same manner.

[Comparative Example 1]
In Example 1, the same procedure as in Example 1 was carried out except that LLDPE3 was used instead of the LLDPE mixture 1, to obtain a laminate. The evaluation results are shown in Table 1.

The layer structure of the obtained laminate is as follows.
PET1 (12 μm) / AC (3 g / m ² ) / LDPE1 (15 μm) / Aluminum foil 1 (7 μm) / AC (3 g / m ² ) / LDPE1 (15 μm) / LLDPE3 (30 μm)

[Comparative Example 2]
In Example 2, the same procedure as in Example 2 was carried out except that LLDPE4 was used instead of the LLDPE mixture 2, and a laminate was obtained. The evaluation results are shown in Table 1.

The layer structure of the obtained laminate is as follows.
PET2 (12 μm) / AC (3 g / m ² ) / LDPE2 (15 μm) / Aluminum foil 2 (7 μm) / AC (3 g / m ² ) / LLDPE4 (30 μm)

<Various evaluation methods>
[Lamination]
A test piece was cut out from each of the laminates into strips with a width of 15 mm, and a T-shaped peeling method (tensile speed 50 mm / min) was used in a 25 ° C atmosphere using a Tensilon tensile tester (RTC-1310A manufactured by Orientec Co., Ltd.). ), The maximum load when the base material layer and the sealant layer were peeled off was measured and used as the lamination strength (N / 15 mm). Furthermore, the peeling interface site was confirmed. The notations in Table 1 have the following meanings.
ALM / PE: Peeled at the interface between aluminum foil and LDPE (adhesive layer).

[Odor sensory test 1]
A laminate is cut into a length of 30 cm and a width of 30 cm, a tetrapouch is prepared so that the sealant layers face each other so that the inside is filled with air, and after storage at 60 ° C. for 72 hours, the odor of the content air is sensory evaluated. Was evaluated by. There were 10 participants in the sensory evaluation experiment, and the average value was calculated and used as the evaluation result.
Indicator: Good 1-5 Bad

[Odor sensory test 2]
A three-way pouch was prepared by cutting the laminate into A4, folding the sealant layers in half in the longitudinal direction, and sealing them so that the sealant layers face each other. The pouch was filled with 100 ml of water, stored at 60 ° C. for 72 hours, and then the odor of the content water was evaluated by sensory evaluation. There were 10 participants in the sensory evaluation experiment, and the average value was calculated and used as the evaluation result.
Indicator good 1-5 bad

<Summary of results>
Examples 1 to 8 in which the sealant layer contains a deodorant-containing layer show better odor sensory test results than Comparative Examples 1 and 2 not containing the deodorant-containing layer, and are equivalent to Comparative Examples 1 and 2. The laminating strength of the above was shown, the peeling interface was the same, and good laminating property was shown.

1. 1. Base material layer 2. Sealant layer 2a. Sealant layer containing no powder deodorant 2b. Sealant layer containing powder deodorant 3. Functional material layer

Claims (13)

A low-odor laminate having a base material layer and a sealant layer.
The sealant layer contains one layer or two or more heat-sealing resin-containing films formed by inflation, and at least one layer is a deodorant-containing sealant layer containing a powder deodorant.
The melt flow rate of the heat-sealing resin is 0.1 to 5.0 g / 10 minutes.
The powder deodorant is a hydrophobic zeolite and is
The odor of the low odor laminate is the odor generated from the heat-sealing resin during the inflation film formation.
Low odor laminate. The low-odor laminate according to claim 1, wherein the heat-sealing resin is a polyolefin-based resin. The second aspect of claim 2, wherein the polyolefin-based resin is one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, random polypropylene, homopolypropylene, and block polypropylene. Low odor laminate. The low odor laminate according to claim 3, wherein the odor is a polyethylene odor or a polypropylene odor. The low odor laminate according to any one of claims 1 to 4, wherein the hydrophobic zeolite has an average particle size of 1 to 10 μm. The low odor laminate according to any one of claims 1 to 5, wherein the hydrophobic zeolite is a high silica zeolite having a silica / alumina mass ratio of 5 to 2000. The deodorant- containing sealant layer containing the powder deodorant contains a deodorant masterbatch.
The deodorant masterbatch contains the powder deodorant and a thermoplastic resin.
The low odor laminate according to any one of claims 1 to 6. The low odor laminate according to claim 7, wherein the content of the powder deodorant in the deodorant masterbatch is 10 to 60% by mass. The content of the powder deodorant in the deodorant-containing sealant layer containing the powder deodorant is 0.1 to 20% by mass, according to any one of claims 1 to 8. The low odor laminate described. The low odor laminate according to any one of claims 1 to 8, wherein the content of the powder deodorant per unit area of the low odor laminate is 0.1 to 10 g / m ^2. .. The low odor laminate according to any one of claims 1 to 10, wherein the sealant layer is laminated on the low odor laminate by dry lamination or lamination via a melt-extruded adhesive layer. body. A low-odor packaging material comprising the low-odor laminate according to any one of claims 1 to 11. The method for producing a low-odor laminate according to any one of claims 1 to 11, which comprises at least the steps a) to d) below.
a) A step of preparing the deodorant masterbatch by melt-blending the powder deodorant and the thermoplastic resin.
b) A step of dry-blending the deodorant masterbatch and the heat-sealing resin to prepare a deodorant layer composition.
c) A step of inflating the deodorant composition to prepare a film for a sealant layer.
d) A step of laminating the sealant layer film on a laminate by dry lamination or by lamination via a melt-extruded adhesive layer.

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