JP7291494B2 - Laminate for molded container, molded container and package - Google Patents

Description

The present invention relates to a laminate used as a material for a molded container for hermetically packaging foodstuffs, etc., a molded container obtained by molding the same laminate, and a package obtained by attaching a lid to the molded container filled with contents. The present invention relates to a body, and more particularly relates to a laminate for a molded container, a molded container and a package having a matte outer surface.

For example, as a container for packaging water bean paste, jelly, baby food, food for nursing care, etc. so that it can be stored for a long time, a metal foil layer made of aluminum foil etc. A molded container is known which is formed by molding a laminated body having a single layer or a plurality of outer resin film layers formed into a cup shape (see Patent Document 1 below).

Here, in the field of packaging, there are cases where a container having a matte outer surface is used in order to give the appearance a high-class appearance.
For example, Patent Document 2 below discloses the use of an embossed polypropylene resin film to produce a stationery file or the like having a matte outer surface.
Patent Document 3 below discloses a hard coat film for molding in which a hard coat layer having a matte outer surface is formed as the outermost layer.
Further, Patent Document 4 below discloses a polypropylene sheet having a matte surface, which is obtained by blending a polypropylene resin, a polyethylene resin, and an elastomer.

JP-A-6-345123 JP-A-5-320376 Japanese Unexamined Patent Application Publication No. 2011-148301 JP-A-2-92944

However, when a laminate having an outer resin film layer composed of an embossed film as in Patent Document 2 is molded into a cup shape, the embossed film is stretched during molding, causing mottling on the matte outer surface. There was a risk that the appearance would be spoiled. Moreover, the use of the embossed film has the problem of increased cost.
In addition, when a laminate having an outer resin film layer composed of a film having a matte coating layer as in Patent Document 3 is molded into a cup shape, cracks occur in the coating layer, or the coating layer peels off. There was a problem. In addition, when forming a matte coating layer, there is also the problem of increased cost.
In addition, when a laminate having a surface layer composed of a matte sheet as in Patent Document 4 is molded into a cup shape, the compatibility of the polyethylene resin and the elastomer with the polypropylene resin is low. There was a problem that bleaching occurred.

The present invention has been made in view of the above problems, and is a container formed by molding a laminate having a metal foil layer and an outer resin film layer, and has a matte outer surface with a good appearance. aims to provide at low cost.

This invention consists of the following aspects in order to achieve said objective.

1) A laminate for a molded container, comprising a metal foil layer and an outer resin film layer laminated on one of both surfaces of the metal foil layer, which is to be the outer side of the container, to form a matte outer surface layer. and
The outer resin film layer comprises a first elastomer-modified olefin resin having a melting point of 155° C. or higher and a crystal melting energy of 50 J/g or higher, and a first elastomer-modified olefin resin having a melting point of 135° C. or higher and a crystal melting energy of 30 J/g or lower. A resin composition containing a second elastomer-modified olefin resin and an olefin elastomer,
The first elastomer-modified olefin resin and the second elastomer-modified olefin resin are each composed of an elastomer-modified homopolypropylene resin,
A laminate for a molded container, wherein the sum of the content of the first elastomer-modified olefin resin and the content of the second elastomer-modified olefin resin in the outer resin film layer is 50% by mass or more.

2) A laminate for a molded container, comprising a metal foil layer and an outer resin film layer laminated on one of both surfaces of the metal foil layer, which is to be the outer side of the container, to form a matte outer surface layer. and
The outer resin film layer comprises a first elastomer-modified olefin resin having a melting point of 155° C. or higher and a crystal melting energy of 50 J/g or higher, and a first elastomer-modified olefin resin having a melting point of 135° C. or higher and a crystal melting energy of 30 J/g or lower. A resin composition containing a second elastomer-modified olefin resin and an olefin elastomer,
The first elastomer-modified olefin-based resin and the second elastomer-modified olefin-based resin are each composed of an elastomer-modified random copolymer,
The elastomer-modified random copolymer is an elastomer-modified random copolymer containing propylene as one of the copolymerization components,
A laminate for a molded container, wherein the sum of the content of the first elastomer-modified olefin resin and the content of the second elastomer-modified olefin resin in the outer resin film layer is 50% by mass or more.

3) A laminate for a molded container, comprising a metal foil layer and an outer resin film layer laminated on one of both sides of the metal foil layer, which is to be the outer side of the container, to form a matte outer surface layer. and
The outer resin film layer comprises a first elastomer-modified olefin resin having a melting point of 155° C. or higher and a crystal melting energy of 50 J/g or higher, and a first elastomer-modified olefin resin having a melting point of 135° C. or higher and a crystal melting energy of 30 J/g or lower. A resin composition containing a second elastomer-modified olefin resin and an olefin elastomer,
The first elastomer-modified olefin resin and the second elastomer-modified olefin resin are composed of an elastomer-modified homopolypropylene resin and an elastomer-modified random copolymer, respectively,
The elastomer-modified random copolymer is an elastomer-modified random copolymer containing propylene as one of the copolymerization components,
A laminate for a molded container, wherein the sum of the content of the first elastomer-modified olefin resin and the content of the second elastomer-modified olefin resin in the outer resin film layer is 50% by mass or more.

4) The laminate for a molded container according to any one of 1) to 3) above, wherein the content of the second elastomer-modified olefin resin in the outer resin film layer is 1 to 50% by mass.

5) The laminate for a molded container according to any one of 1) to 4) above, wherein the content of the first elastomer-modified olefin resin in the outer resin film layer is 49 to 98% by mass.

6) The laminate for a molded container according to any one of 1) to 5) above, wherein the content of the olefinic elastomer in the outer resin film layer is 1 to 30% by mass.

7) The laminate for a molded container according to any one of 1) to 6) above, wherein the surface glossiness of the outer resin film layer is 0.5 to 12%.

8) Each of the elastomer components of the first elastomer-modified olefin resin and the second elastomer-modified olefin resin is at least one of an ethylene-propylene elastomer, an ethylene-1-butene elastomer, and an ethylene-propylene-1-butene elastomer. A laminated body for a molded container according to any one of 1) to 7) above, which is one of

9) The molding of any one of 1) to 8) above, wherein the olefin elastomer is at least one of ethylene-propylene elastomer, ethylene-1-butene elastomer, and ethylene-propylene-1-butene elastomer. Laminates for containers.

10) The laminate for a molded container according to any one of 1) to 9) above, wherein the outer resin film layer further contains at least one of inorganic fine particles, organic fine particles and a slip agent.

11) The laminate for a molded container according to any one of 1) to 10) above, wherein the second elastomer-modified olefin resin has two or more crystallization peaks in a differential scanning calorimetry graph.

12) A plurality of outer resin film layers are laminated on the outer surface of the container among both surfaces of the metal foil layer, and the outer surface layer is The laminate for a molded container according to any one of 1) to 11) above, wherein

13) A printed layer is formed between the metal foil layer and the outer resin film layer, or a coloring component is added to the outer resin film layer so that the surface of the outer resin film layer has a predetermined color. The laminated body for a molded container according to any one of the above 1) to 12), which has an indication or decoration of .

14) A molded container formed by molding the laminated body for molded container according to any one of 1) to 13) into a cup shape, and having a flange on the periphery of the opening.

15) A package, in which a lid is joined to the flange of the molded container of 14) filled with contents so as to cover the opening of the molded container.

In this specification and claims, the "melting point" is the melting peak temperature (Tmp) measured by differential scanning calorimetry (DSC) according to JIS K7121-1987.
Similarly, "crystal melting energy" is the heat of fusion (crystal melting energy, ΔH) measured by differential scanning calorimetry (DSC) according to JIS K7122-1987. When there are two or more crystal melting peak curves and two (ΔH1, ΔH2) or three or more crystal melting energies, the value of the highest crystal melting energy shall be indicated. .

In the laminate for a molded container of 1) to 3) above, the outer resin film layer constituting the matte outer surface layer has a melting point of 155° C. or higher and a crystal melting energy of 50 J/g or higher. Since the resin composition is a combination of a first elastomer-modified olefin resin, a second elastomer-modified olefin resin having a melting point of 135° C. or higher and a crystal melting energy of 30 J/g or less, and an olefin elastomer, The compatibility between the elastomer component and the olefin resin in the first and second elastomer-modified olefin resins of the resin composition is good, the dispersibility of the elastomer component is good, and the interface between the olefin resin phase and the elastomer component is obtained. bond strength is increased. Therefore, during the molding of the above laminates 1) to 3), the interface between the olefinic resin phase and the elastomer component is prevented from being peeled off due to stress, resulting in the formation of gaps called voids. Deterioration of transparency due to difference, that is, whitening phenomenon is prevented. In the case of the above laminates 1) to 3), unlike a laminate having a matte outer surface constituted by an embossed film, the outer surface is not stretched during molding to cause unevenness, and Unlike a laminate in which the outer surface of the outer resin film layer is composed of a film having a matte coating layer, cracks do not occur in the coating layer, the coating layer does not peel off, and the cost is low. .
Therefore, according to the laminated body for a molded container of 1) to 3) above, a molded container having a good appearance and a matte outer surface can be obtained at a low cost.
Further, according to the laminate for a molded container of 1) to 3) above, since the melting point of the first elastomer-modified olefin resin in the resin composition constituting the outer surface layer is 155° C. or higher, When the lid is heat-sealed to the flange of the container formed by molding, the outer surface layer is less likely to be crushed, and sufficient shape retention is ensured.

According to the molded container laminate of 4) above, it is possible to sufficiently secure the various effects described above for the laminates of 1) to 3) above. When the lid is heat-sealed, the outer surface layer is much less likely to be crushed, and the whitening phenomenon can be suppressed more reliably.

According to the laminate for a molded container of 5) above, the effects described above for the laminates of 1) to 3) can be more sufficiently ensured.

According to the laminate for a molded container of 6) above, it is possible to sufficiently ensure the various effects described above for the laminates of 1) to 3) above.

According to the laminate for a molded container of 7) above, the effects described above for the laminates of 1) to 3) can be more sufficiently ensured.

According to the laminate for a molded container of 8) above, the effects described above for the laminates of 1) to 3) above can be more sufficiently ensured.

According to the laminate for a molded container of 9) above, the effects described above for the laminates of 1) to 3) above can be more sufficiently ensured.

According to the laminate for a molded container described in 10) above, it is possible to finely adjust the matte tone (unevenness) of the outer surface of the laminate. Excellent lubricity is imparted, and molding with a deeper molding depth can be satisfactorily performed, and whitening during molding is also sufficiently suppressed.

According to the laminate for a molded container of 11) above, the effects described above for the laminates of 1) to 3) above can be more sufficiently ensured.

According to the laminate for a molded container of 12) above, the effects described above for the laminates of 1) to 3) can be more sufficiently ensured.

According to the laminate for a molded container of 13) above, the printed layer is formed between the metal foil layer and the outer resin film layer, or a coloring component is added to the outer resin film layer, thereby Since the predetermined display or decoration appears on the surface of the surface layer, the molded container obtained by molding the laminate has a more excellent appearance.

According to the molded container of 14) above, since it has a matte outer surface with a good appearance, it is possible to impart a high-class feeling.

According to the packaging body of 15) above, the productivity is good, the cost can be suppressed, and whitening at the time of molding is suppressed, and the container having a matte outer surface with a good appearance gives a high-class feeling. can have

FIG. 2 is a partially enlarged cross-sectional view showing two aspects of the layer structure of the laminate for molded container according to the embodiment of the present invention; It is a vertical sectional view showing the manufacturing method of the package concerning the embodiment of this invention in order of a process. It is a perspective view of the package manufactured by the same method.

Embodiments of the present invention are described below with reference to FIGS. 1-3.

FIG. 1 shows the layer structure of a laminate for molded containers according to an embodiment of the present invention. The illustrated laminate (10) includes a metal foil layer (11) and an outer resin film layer (12) laminated on one of the two surfaces of the metal foil layer (11) that is to be the outside of the container (2): ( 12A) and (12B). In addition, the laminate (10) of this embodiment includes an inner resin layer (13) laminated on one of the two surfaces of the metal foil layer (11) that serves as the inner side of the container (2).
More specifically, in the laminate (10) shown in FIG. 1(a), the outer resin film layer (12) has a single-layer structure, and the layer (12) gives the laminate (10) a matte outer surface. A layer (120) is constructed. In addition, in the laminate (10) shown in FIG. 1(b), the outer resin film layer is the first outer resin film layer (12A) constituting the matte outer surface layer (120) of the laminate (10). , the first outer resin film layer (12A) and the second outer resin film layer (12B) interposed between the metal foil layer (11).

The metal foil layer (11) plays a role of imparting a barrier property to the molded container laminate (10) to prevent permeation of oxygen and moisture.
As the metal foil forming the metal foil layer (11), aluminum foil, iron foil, stainless steel foil, copper foil, or the like can be used, and aluminum foil is preferably used. In the case of aluminum foil, either pure aluminum foil or aluminum alloy foil may be used, and it may be either soft or hard. For example, the iron content is 0.3 to 1.5% by mass. An annealed soft material (O material) of the A8000 series (especially A8079H or A8021H) is excellent in formability and can be suitably used.
One side or both sides of the metal foil layer (11) are subjected to base treatment such as chemical conversion treatment, if necessary. Specifically, for example, on the surface of the metal foil that has been degreased,
1) phosphoric acid;
chromic acid;
2) an aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride; and 2) phosphoric acid;
at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;
3) an aqueous solution of a mixture containing at least one compound selected from the group consisting of chromic acid and chromium (III) salts;
at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;
at least one compound selected from the group consisting of chromic acid and chromium (III) salts;
An aqueous solution of a mixture containing at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride. By doing so, a chemical conversion treatment is applied to form a film.
The film formed on the surface of the metal foil layer (11) by the chemical conversion treatment preferably has a chromium adhesion amount (per side) of 0.1 mg/m ² to 50 mg/m ² , particularly 2 mg/m 2 to 50 mg/m ² . 20 mg/m ² is preferred.
The thickness of the metal foil layer (11) is preferably 30-200 μm, more preferably 50-150 μm. By setting the amount within the above range, sufficient barrier properties and moldability can be obtained.

The outer resin film layers (12): (12A) and (12B) impart a matte design to the outer surface of the molded container (1), and improve the deep drawability and stretchability of the molded container laminate (10). It plays a role of imparting extrudability.

The outer resin film layer (12) or the first outer resin film layer (12A) constituting the matte outer surface layer (120) has a melting point (Tmp) of 155° C. or higher and a crystal melting energy (ΔH) of A first elastomer-modified olefin resin of 50 J/g or more, a second elastomer-modified olefin resin having a melting point (Tmp) of 135°C or more and a crystal melting energy (ΔH) of 30 J/g or less, and an olefin It consists of a resin composition containing a system elastomer. The surface (120a) of the outer surface layer (120) composed of the layers (12):(12A) has a glossiness (gloss value) of 0.5 to 30%, preferably 0.5. ~12%, more preferably 0.5-9%. Here, the "glossiness" is the glossiness (gloss value) measured according to JIS Z8741-1997 (specular glossiness--measuring method, method 3 (incidence angle of 60 degrees)).
The first elastomer-modified olefin resin and the second elastomer-modified olefin resin are composed of elastomer-modified homopolypropylene and/or elastomer-modified random copolymer, respectively. The above elastomer-modified random copolymer is an elastomer-modified random copolymer (random polypropylene) containing propylene and a monomer other than propylene as copolymer components. Copolymerization components (monomers) other than propylene are not particularly limited. butadiene and the like. The elastomer component is not particularly limited, but at least one of ethylene-propylene elastomer (EPR), ethylene-1-butene elastomer (EBR), and ethylene-propylene-1-butene elastomer (EPBR). is preferably used.
The above olefin-based elastomer is not particularly limited, but at least any one of ethylene-propylene elastomer (EPR), ethylene-1-butene elastomer (EBR), and ethylene-propylene-1-butene elastomer (EPBR) or one is preferably used.

The outer surface layer (120) is composed of a first elastomer-modified olefin resin having a melting point (Tmp) of 155°C or higher and a crystal melting energy (ΔH) of 50 J/g or higher, and a melting point (Tmp) of 135°C or higher. and the second elastomer-modified olefin resin having a crystal melting energy (ΔH) of 30 J/g or less for the following reason.
That is, if the melting point of the first elastomer-modified olefin resin is less than 155° C., whitening will occur remarkably when the laminate (10) is molded, and the lid (3) will be heat-sealed to the flange (23) of the container (2). When this is done, the outer surface layer (120) is easily crushed (see Comparative Example 5).
Further, when the melting point of the second elastomer-modified olefin resin is less than 135° C., whitening occurs remarkably during molding of the laminate (10) (see Comparative Example 6).
Further, when the crystal melting energy (ΔH) of the first elastomer-modified olefin resin is less than 50 J/g, the outer surface layer (120) is easily crushed during the heat sealing (see Comparative Example 7). Further, when the crystal melting energy (ΔH) of the second elastomer-modified olefin resin exceeds 30 J/g, whitening occurs to some extent during molding of the laminate (10) (see Comparative Example 8).
If the first elastomer-modified olefin resin having a melting point (Tmp) of 155°C or higher and a crystal melting energy (ΔH) of 50 J/g or higher is not included, whitening occurs to some extent during molding, and the external The surface layer (120) is easily crushed, and the shape retention tends to be insufficient (see Comparative Example 3).
When the second elastomer-modified olefin resin having a melting point (Tmp) of 135°C or higher and a crystal melting energy (ΔH) of 30 J/g or lower is not contained, whitening occurs remarkably during molding (comparative example 4).

The melting point of the first elastomer-modified olefin resin is preferably 155°C or higher and 185°C or lower. The crystal melting energy of the first elastomer-modified olefin resin is preferably 50 J/g or more and 75 J/g or less, more preferably 53 J/g or more and 70 J/g or less.
The second elastomer-modified olefin resin preferably has a melting point of 135° C. or higher and 175° C. or lower. The crystal melting energy of the second elastomer-modified olefin resin is preferably 5 J/g or more and 30 J/g or less, more preferably 10 J/g or more and 25 J/g or less, and more preferably 10 J/g or more. And it is particularly preferably 20 J/g or less.

Regarding the first elastomer-modified olefin-based resin and the second elastomer-modified olefin-based resin, examples of the elastomer modification mode include graft polymerization, but other modification modes may also be used.

The first elastomer-modified olefin resin and the second elastomer-modified olefin resin can be produced, for example, by the following reactor-made method.
That is, first, a Ziegler-Natta catalyst, co-catalyst, propylene and hydrogen are supplied to the first reactor to polymerize homopolypropylene.
The resulting homopolypropylene, containing unreacted propylene and Ziegler-Natta catalyst, is then transferred to the second reactor. In the second reactor, more propylene and hydrogen are added to polymerize homopolypropylene.
Then, the obtained homopolypropylene is transferred to the third reactor while containing unreacted propylene and the Ziegler-Natta catalyst. In the third reactor, ethylene, propylene and hydrogen are further added to polymerize an ethylene-propylene elastomer (EPR) copolymerized with ethylene and propylene.
Thus, the first elastomer-modified olefin resin or the second elastomer-modified olefin resin is produced.
The first elastomer-modified olefin resin can be produced in a liquid phase by adding a solvent, for example. Also, the second elastomer-modified olefin resin can be produced, for example, by performing a reaction in a gas phase without using a solvent.
However, the above is only an example of the production method, and the first elastomer-modified olefin resin and the second elastomer-modified olefin resin are not limited to those produced by such a production method.

In the outer surface layer (120) of the laminate (10), the content of the second elastomer-modified olefin resin is preferably 1 to 50% by mass, more preferably 5 to 30% by mass. 10 to 25% by weight is particularly preferred. If the content of the second elastomer-modified olefin resin is less than 1% by mass, whitening may occur when the laminate (10) is molded. On the other hand, if the content of the second elastomer-modified olefin-based resin exceeds 50% by mass, the heat resistance is lowered.
In the outer surface layer (120), the content of the first elastomer-modified olefin resin is preferably 49 to 98% by mass, more preferably 70 to 95% by mass, more preferably 75 to 90% by mass. is particularly preferred. If the content of the first elastomer-modified olefin resin exceeds 98% by mass, whitening may occur when the laminate (10) is molded. On the other hand, if the content of the first elastomer-modified olefin resin is less than 49% by mass, the heat resistance is lowered.
The content of the olefinic elastomer in the outer surface layer (120) is preferably 1 to 30% by mass, more preferably 3 to 20% by mass, and more preferably 5 to 15% by mass. is particularly preferred. If the content of the olefinic elastomer is less than 1% by mass, it may not be possible to obtain a matte appearance. On the other hand, if the content of the olefinic elastomer exceeds 30% by mass, the heat resistance becomes insufficient, and when the lid (3) is heat-sealed to the flange (23) of the molded container (2), the outside of the flange (23) The surface layer (120) may be crushed.

The outer surface layer (120) preferably has a sea-island structure. With such a sea-island structure, irregularities are formed on the surface of the outer surface layer (120), and light is diffusely reflected to suppress gloss and provide an excellent matte appearance. In the sea-island structure, the elastomer component preferably forms islands.

The second elastomer-modified olefin resin preferably has two or more crystallization peaks in a differential scanning calorimetry (DSC) measurement graph. In the case of having two crystallization peaks, the crystallization peak (crystallization temperature) on the high temperature side is 90°C or higher and the crystallization peak (crystallization temperature) on the low temperature side is 80°C or lower. is preferred. In the case of having three or more crystallization peaks, the highest crystallization peak (crystallization temperature) is 90°C or higher, and the lowest crystallization peak (crystallization temperature) is It is preferably 80°C or less.

The outer surface layer (120) contains at least one of inorganic fine particles, organic fine particles and a slip agent in addition to the first elastomer-modified olefin resin, the second elastomer-modified olefin resin and the olefin elastomer. preferably. By adding inorganic fine particles or organic fine particles to the outer surface layer (120), it is possible to finely adjust the matte tone (concavity and convexity) of the outer surface of the laminate (10), resulting in a better design. be done. Further, by adding a slip agent to the outer surface layer (120), the outer surface of the laminate (10) is imparted with excellent slipperiness, and molding with a deeper molding depth can be performed well. Furthermore, the effect of sufficiently suppressing whitening during molding can be obtained.
Examples of the inorganic fine particles include, but are not limited to, silica, aluminum silicate, and barium sulfate. Examples of the organic fine particles include, but are not particularly limited to, acrylic resin beads, polystyrene resin beads, and the like. Examples of the slip agent include, but are not limited to, fatty acid amides such as erucamide, stearamide and oleic acid amide, and waxes such as crystalline wax and polyethylene wax. In place of or in addition to the addition of the slip agent, a lubricating oil such as silicone oil or rapeseed oil may be applied to the surface of the laminate (10) during molding.

As shown in FIG. 1(b), in a laminate (10) having two-layer outer resin film layers (12A) and (12B), a second outer resin film layer ( 12B) is preferably made of a resin composition containing 50% by mass or more of a random copolymer containing propylene as one of the copolymerization components. Copolymerization components (monomers) other than propylene are not particularly limited. butadiene and the like. Sufficient heat seal strength can be ensured because the content of the random copolymer is 50% by mass or more. More preferably, the content of the random copolymer in the second outer resin film layer (12B) is set at 70% by mass or more. Moreover, the random copolymer containing propylene as one of the copolymerization components is preferably a random copolymer having two or more melting points. In this case, the random copolymer component with a low melting point can further increase the adhesive strength with the metal foil layer (11) to further improve the adhesive performance, and the random copolymer component with a high melting point can further improve the adhesion performance. When the lid (3) is heat-sealed to the flange (23) of the container (2) formed by molding the laminate (10) (see FIG. 2), the second outer resin film layer (12B) is less likely to be crushed, More sufficient shape retention of the container (2) can be ensured.
Also, the second outer resin film layer (12B) preferably does not have a sea-island structure. With such a configuration, when deep drawing the laminate (10) to form the molded container (2), the interface between the olefin resin phase and the elastomer phase in the second outer resin film layer (12B) There is an advantage that the generation of voids (spaces) can be sufficiently suppressed. In particular, when the second outer resin film layer (12B) is arranged adjacent to the metal foil layer (11), the above effects are remarkable.

The films constituting the outer resin film layers (12): (12A) and (12B) are preferably produced by a molding method such as multilayer extrusion molding, inflation molding, or T-die-cast film molding.
The thickness of the outer resin film layers (12): (12A) and (12B) (the total thickness when there are two or more layers) is preferably set to 20 to 80 μm. By setting the thickness to 20 μm or more, it is possible to sufficiently prevent the occurrence of pinholes, and by setting the thickness to 80 μm or less, the amount of resin used is reduced, thereby reducing costs. can be done. More preferably, the thickness of the outer resin film layers (12), (12A) and (12B) is set at 30-50 μm.
When the outer resin film layer has a two-layer structure consisting of the first outer resin film layer (12A) and the second outer resin film layer (12B) (see FIG. 1(b)), the first outer resin film layer ( The ratio of the thickness of 12A) to the thickness of the second outer resin film layer (12B) is preferably in the range of 9:1 to 4:6. If the thickness ratio of the first outer resin film layer (12A) exceeds 9, the lamination strength between both layers (12A) and (12B) may decrease and peeling may occur. On the other hand, if the thickness ratio of the first outer resin film layer (12A) is less than 4, it may not be possible to obtain a matte outer surface layer.
As a method of laminating the film constituting the single-layer outer resin film layer (12) or the second outer resin film layer (12B) of the two layers positioned on the inner side to the metal foil constituting the metal foil layer (11) is not particularly limited, but it is a dry lamination method, a sandwich lamination method (extruding an adhesive film made of acid-modified polypropylene resin or the like, sand-laminating it between the metal foil and the film, and then using a hot roll method of heat lamination) and the like. In the case of the dry lamination method, for example, it is carried out via an adhesive layer (14) made of a two-component curing type polyester-polyurethane resin adhesive, polyether-polyurethane resin adhesive, or the like (see FIG. 1). The thickness of the adhesive layer (14) is preferably set to 1 to 5 μm, more preferably 1 to 3 μm from the viewpoint of thinning and weight reduction of the molded container laminate (10). .

A printed layer (15) is entirely or partially formed on the inner surface of the outer resin film layer (12) or the second outer resin film layer (12B) by gravure printing or the like. A predetermined display or decoration appears on the outer surface of the molded container (2) by means of this printed layer (15). Although the printed layer (15) is not particularly limited, it is preferable that the ground color is a dark color such as black in order to emphasize the matte outer surface (12a) and give a sense of quality.
A coloring component such as a pigment may be added to the outer resin film layers (12), (12A) and (12B) instead of the printed layer (15).

The inner resin layer (13) constitutes the inner surface of the molded container (2) (including the upper surface of the flange portion (23)), and is made of heat-sealable polypropylene resin (PP) film or polyethylene, for example. It is composed of a general-purpose film such as a resin (PE) film or a composite sheet in which these films are bonded together.
The thickness of the film or composite sheet constituting the inner resin layer (13) is preferably 100-500 μm, more preferably 200-400 μm.
Lamination of the metal foil forming the metal foil layer (11) and the film or composite sheet forming the inner resin layer (13) is performed, for example, by a dry lamination method via an adhesive layer (16). For the adhesive layer (16), for example, a two-component curing type polyester-polyurethane resin adhesive or polyether-polyurethane resin adhesive is used. The thickness of the adhesive layer (16) is preferably set to 1 to 5 μm, more preferably 1 to 3 μm from the viewpoint of thinning and weight reduction of the molded container laminate (10). .
Further, the inner resin layer (13) may be formed of a coating layer such as epoxy resin or shellac resin instead of the film or composite sheet.

FIG. 2 shows a package (4) in which a content (C) such as food is hermetically packaged using a molded container (2) molded from the laminate (10) and a lid (3). The manufacturing method is shown in order of steps.

First, the laminate (10) is cut into a predetermined shape and size, and is formed into a cup shape. Forming of the laminate (10) is performed by cold forming such as deep drawing and stretch forming. Thus, a molded container (2) as shown in FIG. 2(a) is obtained.
The molded container (2) comprises a bottom wall (21), a peripheral wall (22) rising from the peripheral edge of the bottom wall (21), and a horizontal annular flange (23) extending radially outward from the upper edge of the peripheral wall (22). ) and
The shape of the molded container (2) may be a tapered cylindrical shape having a cross section such as circular, oval, oval, substantially square, substantially rectangular, etc., with a diameter gradually increasing upward, or a vertical cylindrical shape. and the like.
The depth of the molded container (2) is usually 15-50 mm.
Almost no whitening is observed on the outer surface of the molded container (2) formed from the laminate (10). This is achieved by setting the resin composition of the outer resin film layer (12) or the first outer resin film layer (12A) constituting the outer surface layer (120) of the laminate (10) as described above. This is because the interface between the olefin-based resin phase and the elastomer component is effectively prevented from being peeled off by stress to form voids.

Next, as shown in FIG. 2(b), after filling the molded container (2) with the contents (C) such as food, the lid (3) is attached to the upper surface of the flange (23) of the molded container (2). The peripheral edge of the lower surface is heat-sealed.
Here, as the lid (3), for example, a metal foil layer made of aluminum foil or the like, and a heat shield layer made of polypropylene resin (PP) film, polyethylene resin (PE) film or the like and laminated on the lower surface of the metal foil layer. A material comprising a fusible resin film layer and an outer resin film layer made of a polyester resin (PEs) film, a polyamide resin (PA) film, or the like and laminated on the upper surface of the metal foil layer is used. An opening tab (31) is formed integrally with the lid (3) at a portion of its outer periphery so as to protrude outward beyond the flange (23) of the molded container (2). (See Figure 3).
The means for heat-sealing the lid (3) to the flange (23) of the molded container (2) is not particularly limited. These polymerized portions are heated for a predetermined time with a hot plate heated to a predetermined temperature (for example, about 180° C.) while applying a predetermined pressure.

Next, the package (4) obtained in the above steps is introduced into the retort sterilizer (5) and subjected to retort sterilization.
This retort sterilization treatment step can also serve as a heat treatment step for eliminating whitening that has occurred on part of the outer surface of the molded container (2). That is, in the molded container (2) formed by molding the laminate (10) into a cup shape according to the present invention, as described above, the unique resin composition of the outer surface layer (120) of the laminate (10) results in However, in the unlikely event that a part of the outer surface, especially the corner part of the boundary between the bottom wall and the peripheral wall, where the degree of deformation due to molding is large, the olefin resin matrix and the olefin resin Even if slight whitening occurs due to voids (spaces) generated at the interface with the elastomer, the whitening can be completely eliminated by performing this heat treatment.
The heating temperature of the package (4) in this step is the outer surface layer (120) of the laminate (10), that is, the single outer resin film layer (12) or the outermost layer among the multiple outer resin film layers. (in the case of FIG. 1(b), the softening point of the resin of the first outer resin film layer (12A)). More preferably, the heating temperature is a temperature above the softening point and below the melting point of the resin. By setting the heating temperature to a temperature equal to or higher than the softening point of the resin, distortion of the laminate (10) due to molding is relaxed, and voids are easily filled. Further, by setting the heating temperature to a temperature lower than the melting point of the resin, the shape of the molded container (2) can be maintained even after heating. Specifically, the temperature is about 80°C or higher, preferably about 100 to 180°C. The heating time is about 5 minutes to 3 hours.
The heat treatment process may of course be other than the retort sterilization process, and can be performed, for example, by heat treatment in an oven, immersion treatment in warm water, or the like. In the case of heat treatment other than retort sterilization, only the molded container (2) may be heat-treated in a step prior to forming the package (4).

FIG. 3 shows the package (4) after retort sterilization.
The illustrated package (4) is provided with a molded container (2) having a matte outer surface that does not show whitening due to molding and has a good overall appearance. can result in

Next, an embodiment of the invention will be described. However, the present invention is not limited to the following examples.

<Example 1>
The metal foil layer is made of A8021H-O classified by JIS H4160, and both sides are coated with a chemical conversion treatment liquid consisting of polyacrylic acid, trivalent chromium compound, water and alcohol, dried at 180 ° C., and dried at 180 ° C. An aluminum foil having a thickness of 120 μm and having a chemical conversion coating having a chromium deposition amount of 5 mg/m ² formed thereon was prepared.
A non-stretched polypropylene resin film (CPP) having a two-layer structure with a thickness of 30 μm was prepared as an outer resin film layer. The film is an ethylene-propylene elastomer-modified homopolypropylene resin 94 obtained by copolymerizing ethylene and propylene having a melting point of 163° C. and a crystal melting energy of 58 J/g as the first elastomer-modified olefin resin (B-PP1). ethylene-propylene elastomer-modified random copolymer 1 obtained by copolymerizing ethylene and propylene having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) in mass %. A first resin film layer having a thickness of 27 μm, which constitutes the outer surface layer, and an ethylene-propylene random copoly It was formed by co-extrusion using a T-die so as to form a second resin film layer with a thickness of 3 μm composed of coalescence (R-PP, melting point 155° C.). Also, 1500 ppm of erucamide and 5000 ppm of silica were added to the first resin film layer.
Here, the melting point (Tmp) and crystal melting energy (ΔH) of each of the above resins were measured under the following measurement conditions.
・Temperature increase/decrease speed: 10°C/minute between 23°C and 210°C ・Sample material: 5 mg ・Container: Use an aluminum pan ・Equipment: "DSC-60A" manufactured by Shimadzu Corporation
Next, using a gravure printing machine, black ink (manufactured by DIC Graphics, product name: Panacea CVL-SP Tokuboku 805) was applied to the entire surface of the non-stretched polypropylene resin film on the side of the second resin film layer. A plain printed layer was formed by
A composite sheet (layer ratio: 50 μm/250 μm) of a high-density polyethylene resin film (HDPE) and a polypropylene resin film (PP) having a thickness of 300 μm was prepared as an inner resin layer.
Then, on one side of the aluminum foil, a non-stretched polypropylene resin film (CPP) is dry-laminated using a two-component curing type polyester-polyurethane resin adhesive so that the printed layer is on the inside, and the aluminum foil is On the other hand, the composite sheet is dry-laminated using a two-component curing type polyester-polyurethane resin adhesive so that the high-density polyethylene resin film side faces inward, and cured in an environment of 40° C. for 5 days. Thus, a laminate for a molded container of Example 1 was produced.
Regarding the laminate of Example 1, the glossiness (gloss value) of the surface of the outer surface layer was measured with a glossiness meter (Micro Trigloss S manufactured by BYK Gardner) (the same applies to the following examples and comparative examples. ), 28%.

<Example 2>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 85% by mass of modified homopolypropylene resin, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 5% by weight of ethylene-1-butene elastomer (EBR) was used as the olefin elastomer.
In the laminate of Example 2, the surface glossiness of the outer surface layer was 12%.

<Example 3>
An ethylene-propylene elastomer having a melting point of 155° C. and a crystal melting energy of 51 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 80% by mass of modified random copolymer, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) %, and 10% by weight of ethylene-1-butene elastomer (EBR) as the olefinic elastomer.
In the laminate of Example 3, the surface glossiness of the outer surface layer was 8%.

<Example 4>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 75% by mass of modified homopolypropylene resin, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 136° C. and a crystal melting energy of 18 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 15% by weight of ethylene-1-butene elastomer (EBR) was used as the olefin elastomer.
In the laminate of Example 4, the surface glossiness of the outer surface layer was 9%.

<Example 5>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 70% by mass of modified homopolypropylene resin, and 20% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 10% by weight of ethylene-1-butene elastomer (EBR) was used as the olefin elastomer.
In the laminate of Example 5, the surface glossiness of the outer surface layer was 7%.

<Example 6>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 60% by mass of modified homopolypropylene resin, and 30% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 10% by weight of ethylene-propylene elastomer (EPR) was used as the olefin elastomer.
In the laminate of Example 6, the surface glossiness of the outer surface layer was 4%.

<Example 7>
An ethylene-propylene elastomer having a melting point of 166° C. and a crystal melting energy of 65 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 65% by mass of modified homopolypropylene resin, and 20% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) A laminate for a molded container was produced in the same manner as in Example 1 except that 15% by weight of ethylene-propylene elastomer (EPR) was used as the olefin elastomer.
In the laminate of Example 7, the surface glossiness of the outer surface layer was 5%.

<Example 8>
An ethylene-propylene elastomer having a melting point of 166° C. and a crystal melting energy of 65 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 60% by mass of modified homopolypropylene resin, and 30% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 10% by weight of ethylene-propylene elastomer (EPR) was used as the olefin elastomer.
In the laminate of Example 8, the surface glossiness of the outer surface layer was 4%.

<Example 9>
A non-stretched polypropylene resin film (CPP) having a single-layer structure with a thickness of 30 μm was prepared as an outer resin film layer. The film is an ethylene-propylene elastomer-modified homopolypropylene resin 94 obtained by copolymerizing ethylene and propylene having a melting point of 163° C. and a crystal melting energy of 58 J/g as the first elastomer-modified olefin resin (B-PP1). ethylene-propylene elastomer-modified random copolymer 1 obtained by copolymerizing ethylene and propylene having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) in mass %. It is made of a resin composition containing 5% by weight of ethylene-1-butene elastomer (EBR) as an olefinic elastomer, and is extruded using a T-die. Further, 1500 ppm of erucamide and 5000 ppm of silica were added to the outer resin film layer.
Then, a laminate for a molded container was produced in the same manner as in Example 1 except for the above, and this was designated as Example 9.
In the laminate of Example 9, the surface glossiness of the outer surface layer was 28%.

<Comparative Example 1>
As the outer resin film layer, a random polypropylene resin (R-PP) film (=outer surface layer, melting point 155°C, crystal melting energy 57 J/g), melting point 163°C and crystal melting energy 58 J/g An ethylene-propylene elastomer-modified homopolypropylene resin (B-PP) film and a random polypropylene resin (R-PP) film (melting point 155° C., crystal melting energy 57 J/g) are laminated in this order to form a 30 μm thick film. A laminate for a molded container was produced in the same manner as in Example 1 except that a non-stretched polypropylene resin film (CPP) having a three-layer structure was used.
In the laminate of Comparative Example 1, the surface glossiness of the outer surface layer was 102%.

<Comparative Example 2>
Ethylene obtained by copolymerizing ethylene and propylene having a melting point of 163° C. and a crystal melting energy of 58 J/g, using the first elastomer-modified olefin resin (B-PP1) as the outer resin film layer constituting the outer surface layer. -Propylene elastomer-modified homopolypropylene resin 90% by mass, ethylene-1-butene copolymer (EBR) 10% by mass as the olefin elastomer in the same manner as in Example 1, A laminate for a molded container was produced and designated as Comparative Example 2.
In the laminate of Comparative Example 2, the surface glossiness of the outer surface layer was 10%.

<Comparative Example 3>
A second elastomer-modified olefin resin (B-PP2) is used as the first resin film layer constituting the outer surface layer, and an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g is used. A laminate for a molded container was produced in the same manner as in Example 1, except that the resin composition contained 90% by weight of the polymer and 10% by weight of ethylene-propylene elastomer (EPR) as the olefin elastomer. This is referred to as Comparative Example 3.
In the laminate of Comparative Example 3, the surface glossiness of the outer surface layer was 22%.

<Comparative Example 4>
Ethylene-propylene elastomer-modified homopolypropylene having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). A laminate for a molded container was produced in the same manner as in Example 1, except that the resin was made of 100% by mass.
In the laminate of Comparative Example 4, the surface glossiness of the outer surface layer was 72%.

<Comparative Example 5>
An ethylene-propylene elastomer having a melting point of 145° C. and a crystal melting energy of 50 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 80% by mass of modified random copolymer, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) %, and 10% by weight of ethylene-propylene elastomer (EPR) as the olefinic elastomer.
In the laminate of Comparative Example 5, the surface glossiness of the outer surface layer was 19%.

<Comparative Example 6>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 80% by mass of modified homopolypropylene resin, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 130° C. and a crystal melting energy of 14 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 10% by weight of ethylene-propylene elastomer (EPR) was used as the olefin elastomer.
In the laminate of Comparative Example 6, the surface glossiness of the outer surface layer was 13%.

<Comparative Example 7>
An ethylene-propylene elastomer having a melting point of 155° C. and a crystal melting energy of 49 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 75% by mass of modified random copolymer, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 144° C. and a crystal melting energy of 19 J/g as the second elastomer-modified olefin resin (B-PP2) %, and 15% by weight of ethylene-propylene elastomer (EPR) as the olefin elastomer.
In the laminate of Comparative Example 7, the surface glossiness of the outer surface layer was 12%.

<Comparative Example 8>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). 80% by mass of modified homopolypropylene resin, and 10% by mass of an ethylene-propylene elastomer-modified random copolymer having a melting point of 158° C. and a crystal melting energy of 44 J/g as the second elastomer-modified olefin resin (B-PP2). A laminate for a molded container was produced in the same manner as in Example 1 except that 10% by weight of ethylene-propylene elastomer (EPR) was used as the olefin elastomer.
In the laminate of Comparative Example 8, the surface glossiness of the outer surface layer was 15%.

<Comparative Example 9>
An ethylene-propylene elastomer having a melting point of 163° C. and a crystal melting energy of 58 J/g, wherein the resin composition of the first resin film layer constituting the outer surface layer is the first elastomer-modified olefin resin (B-PP1). Example 1 except that 90% by weight of the modified homopolypropylene resin and 10% by weight of an ethylene-propylene elastomer (EPR) having a melting point of 40 to 70° C. and a crystal melting energy of 15 J / g were used as the olefin elastomer. Similarly, a laminate for a molded container was produced, and this was designated as Comparative Example 9.
In the laminate of Comparative Example 9, the surface glossiness of the outer surface layer was 15%.

[Production of container]
Next, each of the molded container laminates of Examples 1 to 9 and Comparative Examples 1 to 9 was cut into a predetermined shape and size to prepare a blank, and both sides of each blank were coated with a small amount of siloxane. A round cup-shaped container with a flange (bottom diameter 52 mmφ, opening diameter 65 mmφ, height 30 mm, flange width 8 mm).

[Production of lid]
On the other hand, on one side of a 20 μm thick aluminum foil made of A1N30H-O classified according to JIS H4160, a 12 μm thick polyethylene terephthalate resin (PET) film as an outer resin layer was coated on one side, and a two-component curable polyester-polyurethane resin system was applied. Dry lamination is performed using an adhesive, and on the other side of the aluminum foil, a 30 μm thick linear low-density polyethylene resin (LLDPE) film is applied as a heat-sealable resin layer. A laminate for a lid was produced by performing dry lamination using an adhesive and aging in an environment of 40°C for 5 days.
A lid with an opening tab was made by cutting the resulting laminate to the desired shape and size to fit the flange.

[Preparation of package]
After putting 70 ml of water in each of the above containers, the lid is placed on the upper surface of the flange of the container so that the unstretched polypropylene resin film (CPP) surface is in contact, and a donut-shaped A hot plate (outer diameter: 90 mmφ, inner diameter: 74 mmφ) was pressed with a pressure of 150 kgf for 3 seconds to perform heat sealing (heat fusion bonding).
Thus, a package was obtained.

[Verification of Appearance of Package]
By visually observing the container of each package obtained, it was verified whether or not whitening had occurred on the outer surface and whether or not the outer surface layer of the flange had been crushed. The verification results are shown in Table 1 below together with the composition and glossiness of the outer surface layer of the laminate, which is the molding material for each container.
In the column of "whitening of the outer surface of the container" in Table 1, "◎" indicates that no or almost no whitening was observed on the outer surface of the container, "◯" indicates that there was little whitening, A case where whitening occurred to some extent was rated as "Δ", and a case where whitening occurred remarkably was rated as "x". In addition, in the column of "flange crushing" in Table 1, "◎" indicates that the outer surface layer of the flange of the container is not crushed due to the heat sealing of the lid, and "◎" indicates that there was almost no crushing. ∘”, “Δ” when crushing occurred to some extent, and “×” when conspicuous crushing occurred. In Table 1, the first elastomer-modified olefin resin is indicated as "B-PP1", and the second elastomer-modified olefin resin is indicated as "B-PP2".

As is clear from Table 1, the laminates of Examples 1 to 9 have low glossiness, and the whitening phenomenon during molding is improved. Further, in the case of Examples 1 to 9, the outer surface layer of the flange of the container after the lid was heat-sealed was not crushed.
On the other hand, in Comparative Examples 1 and 4, since the composition of the outer surface layer was different from that of the present invention, the glossiness was not sufficiently reduced, and a matte laminate could not be obtained.
In the laminates of Comparative Examples 2, 6, 8 and 9, the glossiness was sufficiently lowered, but a strong whitening phenomenon was observed in the R portion of the bottom of the molded container.
In the laminates of Comparative Examples 3, 5, and 7, whitening due to molding was suppressed, but the outer surface layer of the flange of the container after the lid was heat-sealed was crushed, and the shape retainability was insufficient.
From the above verification results, the crushing of the outer surface layer of the flange of the container is considered to be affected by both the melting point of the resin component and the crystal melting energy. the melting point of the higher one if B-PP1 and B-PP2 are contained) is 155° C. or higher, and the crystal melting energy (when B-PP1 and B-PP2 are contained, the value obtained by weighting and averaging the crystal melting energies of both by the content ratio) is 40 J / g. It can be seen that crushing is less likely to occur when it is 50 J/g or more (more preferably 50 J/g or more).

INDUSTRIAL APPLICABILITY The present invention can be suitably used for a molded container having a matte outer surface with a good appearance and for hermetic packaging of foods and the like, and a laminate used as a molding material thereof.

(2): Molded container
(23): Flange
(3): Lid
(4): package
(5): Retort sterilizer
(10): Laminate for molded container
(11): Metal foil layer
(12): Outer resin film layer
(12A): First outer resin film layer
(12B): Second outer resin film layer
(120): outer surface layer
(120a): surface of outer surface layer
(15): Print layer
(C): Contents

Claims (12)

A laminate for a molded container, comprising: a metal foil layer; and an outer resin film layer laminated on one of both surfaces of the metal foil layer, which is to be the outer side of the container, to form a matte outer surface layer. hand,
The outer resin film layer comprises a first elastomer-modified olefin resin having a melting point of 155° C. or higher and a crystal melting energy of 50 J/g or higher , and a first elastomer-modified olefin resin having a melting point of 135° C. or higher and a crystal melting energy of 30 J/g. Consisting of a resin composition containing the following second elastomer-modified olefin resin and an olefin elastomer ,
The first elastomer-modified olefin resin and the second elastomer-modified olefin resin are each composed of an elastomer-modified homopolypropylene resin and/or an elastomer-modified random copolymer,
The elastomer-modified random copolymer is an elastomer-modified random copolymer containing propylene as one of the copolymerization components,
In the outer resin film layer, the total value of the content of the first elastomer-modified olefin resin and the content of the second elastomer-modified olefin resin is 50% by mass or more , and the content of the olefin elastomer is is 1 to 30% by mass , a laminate for a molded container. 2. The laminate for a molded container according to claim 1, wherein the content of the second elastomer-modified olefin resin in the outer resin film layer is 1 to 50% by mass. 3. The laminate for a molded container according to claim 1, wherein the content of the first elastomer-modified olefin resin in the outer resin film layer is 49 to 98% by mass. The laminate for a molded container according to any one of claims 1 to 3 , wherein the outer resin film layer has a surface gloss of 0.5 to 12%. The elastomer component of each of the first elastomer-modified olefin resin and the second elastomer-modified olefin resin is at least one of ethylene-propylene elastomer, ethylene-1-butene elastomer, and ethylene-propylene-1-butene elastomer. The laminated body for a molded container according to any one of claims 1 to 4 , which is The molding according to any one of claims 1 to 5 , wherein the olefin elastomer is at least one of ethylene-propylene elastomer, ethylene-1-butene elastomer, and ethylene-propylene-1-butene elastomer. Laminates for containers. The laminate for a molded container according to any one of claims 1 to 6 , wherein said outer resin film layer further contains at least one of inorganic fine particles, organic fine particles and a slip agent. The laminate for a molded container according to any one of claims 1 to 7 , wherein the second elastomer-modified olefin resin has two or more crystallization peaks in a differential scanning calorimetry graph. A plurality of outer resin film layers are laminated on the outer surface of the container among both surfaces of the metal foil layer, and the outer surface layer is composed of the outermost resin film layer among the plurality of outer resin film layers. A laminated body for a molded container according to any one of claims 1 to 8 , wherein A printed layer is formed between the metal foil layer and the outer resin film layer, or a coloring component is added to the outer resin film layer so that a predetermined display is formed on the surface of the outer resin film layer. Or, the laminated body for a molded container according to any one of claims 1 to 9 , which has decoration. A molded container formed by molding the molded container laminate according to any one of claims 1 to 10 into a cup shape and having a flange on the periphery of the opening. 12. A package comprising a lid joined to the flange of the molded container filled with contents according to claim 11 so as to cover the opening of the molded container.

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