JPH0748497Y2 - Beverage cups - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cup-shaped container for food and drink, and more particularly, to a long-term container filled with powder, fluid, solid food or beverage such as liquor and juice. The present invention relates to a cup-shaped container for food and drink, which can be stored for a long period of time, and has excellent heat resistance and cold shock resistance.

[Prior Art] Several proposals have been made for a food and drink container in which a plastic container is inserted inside a paper product to form a double container. For example, in Japanese Utility Model Publication No. 61-32751,
A paper container coated on both sides with a plastic resin layer as the outer layer, a copolymer layer of polyvinyl alcohol and ethylene as the middle layer, and a polyester resin layer as the inner layer were inserted into the food container. An article container is disclosed. Further, Japanese Utility Model Publication No. 57-3605 discloses a container for alcoholic beverages in which a general-purpose polyester container is inserted into a paper container coated on both sides with a plastic and integrated at the rim of the container. .

[Problems to be Solved by the Invention] However, the heat resistance of the polyester resin used in the above conventional containers has a glass transition point of 65 ° C. to 70 ° C., which is low as a food container. Deformation tends to occur when directly heating the contents in a microwave oven, and
There is a problem that the impact strength of the container at low temperature is poor and the container is broken when dropped in a cold region in winter.

Further, in particular, sake is yellowed by ultraviolet rays, and a odor of sunlight and a unique odor called bottle incense are generated, and the taste may be bitter.

The present invention is intended to solve the above-mentioned problems, and its purpose is to prevent deformation even when the food or drink is hot-filled or heated by a microwave oven, and has no problem even under low-temperature conditions in cold regions. An object of the present invention is to provide a food-drink cup-shaped container having impact resistance and having an effect of preventing deterioration of contents due to ultraviolet rays.

[Means for Solving the Problems] According to the present invention, a paper container whose both surfaces are resin-coated,
Provided is a cup-shaped container for food and drink, characterized in that a multilayer plastic container having a polyester resin layer as an inner layer and a polymer alloy resin layer of polyarylate arranged at least one layer in another layer is inserted. Is.

Next, the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a half sectional view showing a food and drink cup-shaped container according to the present invention.

In FIG. 1, reference numeral 1 denotes a paper container, which comprises a cylindrical body 2a having a polyethylene resin layer 3 coated on the inner and outer surfaces of the paper, and a circular bottom 2b. The body portion 2a and the bottom portion 2b are integrated at the lower end portion 5 of the paper container 1 by heat fusion (heat sealing).

The upper end of the paper container 1 is extended to the outside and forms a collar portion 6. The paper container can adopt the flat printing method that can enhance the product value and design effect, and has the rigidity to play the role of protecting the multilayer plastic. Reference numeral 4 denotes a multi-layer plastic container. As shown in FIG. 2 as an enlarged cross-sectional view of a laminate constituting the container, the inner layer 4a and / or the outer layer 4b is a polyester resin layer, and the space between the inner layer 4a and the outer layer 4b. A polymer alloy resin layer 4c of polyarylate is arranged, and its upper end is extended to the outside like the paper container,
The flange portion 7 is formed.

The multi-layered plastic container 4 is inserted into the paper container 1, and the flange portion 7 is overlapped so that the flange portion 6 of the paper container 1 is rolled up, and the both are integrally joined to form a food and drink cup-shaped container 8. It is formed.

As shown in FIG. 1, a slight gap is provided between the paper container 1 and the multilayer plastic container 4 except for the flange portion 7. By providing such a gap, even if the contents are directly heated by the microwave oven, heat is not transmitted to the paper container 1 due to the heat insulating effect, so that it is possible to prevent an unexpected burn or the like.

In the multilayer plastic container of the present invention, the polyester resin used for the inner layer is preferably a linear polyethylene terephthalate homopolymer having ethylene terephthalate units or butylene terephthalate units as repeating units, or a linear polybutylene terephthalate homopolymer. However, part of terephthalic acid is phthalic acid, isophthalic acid, succinic acid, adipic acid, sebacic acid, dodecanedicarboxylic acid, hexahydroterephthalic acid, 2,6-naphthalenedicarboxylic acid, 2,5-dibromoterephthalic acid, diphenyl Dicarboxylic acid, trimellitic acid, trimesic acid, pyromellitic acid, etc., and part of ethylene glycol is propylene glycol, diethylene glycol, tetralatyrene glycol, polyethylene glycol, polyethylene glycol. La glycol, 1,6-hexanediol, trimethylene glycol, neopentyl glycol, p- xylene glycol, 1,6-cyclohexanedimethanol, bisphenol A, glycerol, pentaerythritol, trimethanolpropane,
It may be replaced with trimethanolbenzene, triethanolbenzene or the like.

Further, particularly when the product to be filled is an alcoholic beverage such as sake, western sake, fruit wine, etc., the intrinsic viscosity of the inner layer polyester (phenol / tetrachloroethane =
The 50/50 (weight ratio) intrinsic viscosity determined from the solution viscosity measured at 25 ° C. in a solution) is preferably in the range of 0.5 to 1.4, and more preferably in the range of 0.6 to 1.2.

The polyarylate used in the present invention is obtained from an aromatic dicarboxylic acid or its functional derivative and a dihydric phenol or its functional derivative. The aromatic dicarboxylic acid used for adjusting the polyarylate may be any one as long as it reacts with the dihydric phenol to give a satisfactory polymer, and one kind or a mixture of two or more kinds is used. Preferable aromatic dicarboxylic acids include terephthalic acid and isophthalic acid, and a mixture thereof is particularly preferable in terms of melt processability and overall performance.
In the case of such a mixture, the mixing ratio is not limited, but terephthalic acid / isophthalic acid = 9/1 to 1/9 (molar ratio) is preferable, and particularly 7 // in terms of melt processability and performance balance. 3 to 3/7 (molar ratio) is desirable.

Specific examples of preferable dihydric phenol include 2,2-bis (4-hydroxyphenyl) propane and 2,2-bis (4
-Hydroxy-3,5-dibromophenyl) propane, 2,2
-Bis (4-hydroxy-3,5-dichlorophenyl) propane, 4,4'-dihydroxydiphenyl sulfone, 4,
4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenylmethane, 2,2'-bis (4-hydroxy-3,5-dimethylphenyl) Propane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4′-dihydroxydiphenyl, benzoquinone and the like can be mentioned. These may be used alone or in combination of two or more.

Although these dihydric phenols are para-substituted, other isomers may be used, and ethylene glycol, propylene glycol or the like may be used as these dihydric phenols. The most representative dihydric phenol is
2,2-bis (4-hydroxyphenyl) propane, which is usually called bisphenol A, is most preferable from the viewpoint of comprehensive physical properties.

Therefore, the most preferable polyarylate in the present invention is a mixture of terephthalic acid and isophthalic acid or a functional derivative thereof (provided that the molar ratio of terephthalic acid residue to isophthalic acid residue is 9: 1 to 1: 9, particularly 7: 3 to 3:
7) and a dihydric phenol, especially bisphenol A or a functional derivative thereof. The molecular weight of the polyarylate used in the present invention is preferably in the range of about 7,000 to 100,000 from the viewpoint of physical properties and extrusion processability.

The polymer alloy resin of polyarylate is a polymer alloy resin composed of polyarylate and polyester resin, and one having a polyarylate content of 5% by weight or more is preferable for exhibiting the desired heat resistance and impact resistance.

As the polyester resin which is blended with polyarylate to form a polymer alloy, those exemplified as the polyester resin used for the inner and outer layers described above can be used.

When the polymer alloy resin layer contains a polyester resin, the adhesion between the polyester resin layer as an inner layer and the polymer alloy layer becomes good, which is preferable. By using the polymer alloy having a polyarylate resin content of 5% by weight or more, the food and drink cup-shaped container of the present invention can be filled with food and drink at 65 ° C to 70 ° C without thermal deformation. Also,
When the polyarylate resin content is 25% by weight or more, juice having a pH of less than 4 can be hot-filled at 85 ° C. Further, when the polyarylate resin content is 40% by weight or more, the contents can be put and heated to about 100 ° C. with an electronic range.

If the polyarylate resin content exceeds 60% by weight, molding becomes difficult and expensive, which is not preferable.

Next, the thickness of the polymer alloy resin layer of polyarylate in the multi-layered plastic container of the present invention is the total thickness of the multi-layered plastic container 300 to 1500 μm, preferably 600.
It is preferably 5% to 30% with respect to 800 μm. 5
Sufficient heat resistance and cold shock resistance can be obtained when the content is at least%. Even if it exceeds 30%, no improvement in heat resistance and cold shock resistance due to an increase in the thickness of the polymer alloy resin layer is seen, and the merit is lost economically.

In the layer structure of the multi-layered plastic container used in the present invention, it is essential that the inner layer is a polyester resin layer and at least one polymer alloy resin layer of polyarylate is disposed on the other layers.

When storing food in a dry state, the food is stored in direct contact with the inner layer of the inserted plastic container, but since this inner layer consists of a polyester resin layer, the polyester resin layer is odorless. Since no off-flavor is transferred to the food and the flavor of the contents is not adsorbed, it can be enjoyed for a long time without affecting the taste and smell. Further, the polyester resin layer has a low permeability to oxygen and carbon dioxide gas, has a long shelf life, and has a good aroma retaining property.

The most basic layer structure of the multi-layer plastic container of the present invention is as follows.

PET / PAr (However, the polyester resin layer is represented by PET, and the polymer alloy resin layer of polyarylate and polyester resin is PA
Expressed as r. ) The layer structure is shown in FIG. In this case, PET is used on the inner surface of the container and PAr is used on the outer surface of the container.

Also, a polyester resin layer can be laminated on the outer surface of the polymer alloy resin layer as described below.

PET / PAr / PET Further, the polymer alloy resin layer can be divided into two layers as follows.

PET / PAr / PET / PAr / PET Polyarylate polymer alloy resin layers have a higher net deformation temperature than PET and therefore require higher temperatures in molding than PET. By arranging the PAr layer near the surface in this manner, PAr can be given a sufficient amount of heat necessary for molding, and the moldability can be improved.

Further, the following layer structure in which an oxygen barrier resin layer (hereinafter referred to as a barrier layer) is laminated may be used.

PET / PAr / AD / Br / AD / PAr / PET (Here, Br is a barrier layer and AD is an adhesive resin layer.) The barrier layer is vinylidene chloride, polyamide, a copolymer of polyvinyl alcohol and ethylene. (Eval) or the like can be used.

Since such a barrier layer greatly prevents the permeation of oxygen, the food is extremely prevented from being oxidized as compared with the case where the barrier layer is not used, which results in a long shelf life and a long-term storage.

In the present invention, the resin coated on both sides of the paper container 1 is not limited to polyethylene resin. Further, the shape of the container is not limited to the cylindrical shape, and may have another shape.

[Function] In the food and drink cup-shaped container of the present invention, since the innermost layer of the multilayer plastic container to be inserted is the polyester resin layer, there is no odor of the polyester resin itself, no odor is transferred to food, and no odor. Since it is not adsorbed, the flavor of the contents is not impaired for a long time.

Further, since at least one polymer alloy resin layer of polyarylate having high glass point transfer is arranged on the outer layer of the polyester resin of the inner layer, heat resistance and cold shock resistance of the multi-layer plastic container are improved, and ultraviolet rays are blocked. .

[Examples] Next, the present invention will be described with reference to Examples.

Example 1 Terephthalic acid and 2,2-bis (4-hydroxyphenyl)
Polyethylene terephthalate resin (PAr) obtained by blending 55 parts by weight of polyethylene terephthalate resin with 45 parts by weight of polyarylate resin having a glass transition temperature of 193 ° C. obtained from propane and polyethylene terephthalate resin are used. Was coextruded to obtain a multilayer plastic laminated sheet having a total thickness of 600 to 800 μm and having the following layer constitution.

PET / PAr / PET / PAr / PET This laminated sheet was molded by sheet molding (vacuum pressure molding) to prepare a multilayer plastic container. FIG. 3 shows an enlarged cross-sectional view of the laminated body that constitutes this container.

On the other hand, it is composed of a tubular body 2a and a circular bottom 2b in which both sides of the paper are coated with a polyethylene resin layer 3, and the body 2 and the bottom 2b are integrated by adhesion at the lower end and at the upper end. The collar portion 6 was formed to make a paper container.

Next, the multi-layer plastic container 4 obtained above is inserted into the paper container 1, and the flange portion 7 is overlapped so that the collar portion 6 of the paper container 1 is wound, and both are integrally joined. A cup-shaped container for food and drink was prepared.

Filling the obtained food and drink cup-shaped container with sake
There was no change even when filled at 70 ° C, and no problematic deformation was observed even if this was heated in a microwave oven and boiled. Also, use 85
After hot filling at ℃, no change was observed in the cup-shaped container for food and drink.

The sake-shaped cup-shaped container obtained above was filled with sake, and the inside temperature of the filling and the outside air atmosphere temperature were both -5 ° C.
When dropped from a height of 1 m, it was found that the container had no damage such as cracks and had excellent cold shock resistance.

Example 2 By blow molding, a multilayer plastic container similar to that of Example 1 was obtained. Hereinafter, it was integrated with a paper container in the same manner as in Example 1 to prepare a food and drink cup-shaped container. When the heat resistance and cold shock resistance of the obtained container were examined in the same manner as in Example 1, excellent results were obtained as in Example 1.

Example 3 About 40 to 50% of scrap is formed by sheet forming of a cylindrical container, and therefore it is necessary to reuse. Therefore, a scrap (a mixed material of a polyethylene terephthalate resin and a polymer alloy resin layer of polyarylate) obtained at the time of producing the container of Example 1 was used to produce a laminated sheet having the following layer structure, and then the same procedure as in Example 1 was performed. A cup-shaped container for eating and drinking was prepared.

PET / PAr / scrap / PET / scrap / PAr / PET The cup-shaped container for food and drink obtained above was examined for heat resistance and cold shock resistance in the same manner as in Example 1.
Excellent results were obtained according to.

[Effects of the Invention] As is clear from the above description, since the innermost layer of the multi-layer plastic container to be inserted is the polyester resin layer, the food and drink cup-shaped container of the present invention does not absorb odors and is filled with packing material. Does not impair the flavor and the polyester itself has no odor, so the flavor of the filling is not impaired. Also,
The polyester resin layer is inert to the contents, has excellent chemical properties, chemical resistance such as alcohol resistance, and has no effect on the human body due to plasticizers and residual monomers. It exhibits excellent performance as a container. Also,
Since at least one polyarylate polymer alloy resin layer with a high glass transition point is arranged on the outer layer of the inner polyester resin layer, the multi-layered plastic container has markedly superior heat resistance and cold shock resistance to the conventional one. Therefore, it withstands boiling due to heating of a microwave oven, and is less likely to be broken even when dropped under freezing conditions such as -5 ° C.
Further, the polymer alloy resin layer has an effect of blocking ultraviolet rays, and can prevent deterioration and change of food due to ultraviolet rays.

In addition, the plastic container that contains the contents is extremely thin, so it does not have rigidity and can be easily deformed with a little pressure with your hands, but this plastic container has resin coating on both sides. Since it is inserted in the paper container, it not only becomes a rigid and strong container as a whole, but since the paper container is resin-coated on both sides, it gets wet with water during the process of filling and using. It has the characteristic that it is difficult to deform and damage even if it is used.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view showing a food and drink cup-shaped container according to the present invention, and FIGS. 2, 3, and 4 are multilayer plastic containers used for the food and drink cup-shaped container of FIG. It is an expanded sectional view which shows the structure of a body. 1 ... paper container, 2a ... cylindrical body, 2b ... circular bottom, 3 ... resin layer, 4 ... multilayer plastic container, 4a
…… Inner layer (polyester resin layer), 4b …… Outer layer (polyester resin layer), 4c …… Polyarylate polymer alloy resin layer, 5 …… Lower end of paper container, 6 …… Bill part, 7 ...
… Flange part, 8 …… Food and drink cup-shaped container, 41, 43, 45…
… Polyethylene terephthalate resin layer, 42,44 …… Polyarylate polymer alloy resin layer, 46 …… Polyethylene terephthalate resin layer, 47 …… Polyarylate polymer alloy resin layer.

Claims (1)

[Scope of utility model registration request] 1. A multi-layer plastic container having a polyester resin layer as an inner layer and at least one polymer alloy resin layer of polyarylate as an inner layer is inserted into a paper container having resin coated on both sides. A cup-shaped container for food and drink, characterized in that