Polyester container, and polyester preform

Abstract

To provide a polyester container exhibiting high hygiene, while exhibiting a high environmental load reduction property.SOLUTION: A polyester container 10 according to the present invention comprises a mixture layer 22; the mixture layer 22 is constituted from an admixture obtained by mixing virgin polyester with recycled polyester; and the virgin polyester is antimony-free catalyst polyester.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a polyester container and a polyester preform used in the production of the polyester container. [Background technology]

[0002] Polyesters such as polyethylene terephthalate are widely used in the manufacture of containers for filling beverages and the like because they are inexpensive and have excellent mechanical properties, chemical stability, heat resistance, gas barrier properties, transparency, and the like.

[0003] The polyesters used in the manufacture of containers are either those using an antimony catalyst (hereinafter referred to as antimony-catalyzed polyesters) or those using a germanium catalyst (hereinafter referred to as germanium-catalyzed polyesters) as a polymerization catalyst. Among these polymerization catalysts, antimony-catalyzed polyesters are particularly widely used due to their cost.

[0004] Incidentally, in recent years, for the purpose of reducing the environmental burden, used polyester containers have been recycled by various methods, and containers have been produced using the resulting polyester (hereinafter referred to as recycled polyester).

[0005] However, polyester containers are not recycled for each polymerization catalyst used in the synthesis of polyester, so there is a high possibility that the recycled polyester contains antimony catalysts. In addition, polyester containers may become contaminated during the recovery process or during use, such as for storing non-food items (e.g., pesticides and machine oils), making it difficult to completely remove contaminants from recycled polyester.

[0006] Therefore, when polyester containers are repeatedly recycled, the contaminants and antimony catalysts that could not be removed accumulate in the recycled polyester, and there is concern that they may leach out into the contents filled in the recycled polyester containers. In addition, in convenience stores and the like, containers filled with contents are placed upright and heated in a hot water heater before being sold, and in such a heated state, the leach-out of antimony is particularly problematic. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a polyester container that has a high reduction in environmental impact and is also highly hygienic. Another object of the present invention is to provide a polyester preform for use in producing the polyester container. [Means for solving the problem]

[0008] The polyester container of the present invention has a mixed layer, The mixed layer is comprised of a mixture of virgin polyester and recycled polyester, the virgin polyester being a non-antimony catalyzed polyester.

[0009] In the polyester container of the present invention, the non-antimony catalyzed polyester of the mixed layer may be one or more polyesters selected from manganese catalyzed polyesters, titanium catalyzed polyesters, aluminum catalyzed polyesters, lithium catalyzed polyesters, and germanium catalyzed polyesters.

[0010] In the polyester container of the present invention, the content of the virgin polyester in the mixed layer may be 30 parts by mass or more and 95 parts by mass or less with respect to 100 parts by mass of the total amount of the resin material in the mixed layer.

[0011] In the polyester container of the present invention, the polyester container has a first layer constituting an inner layer and a second layer, The first layer is the mixed layer, The second layer may be constructed from recycled polyester.

[0012] In the polyester container of the present invention, the first layer may have a thickness of 0.01 mm or more and 0.33 mm or less.

[0013] In the polyester container of the present invention, the polyester container further has a third layer constituting an outer layer, The third layer is comprised of a blend of virgin polyester and recycled polyester, and the virgin polyester of the third layer may be a non-antimony catalyzed polyester.

[0014] In the polyester container of the present invention, the non-antimony catalyzed polyester of the third layer may be one or more polyesters selected from manganese catalyzed polyesters, titanium catalyzed polyesters, aluminum catalyzed polyesters, lithium catalyzed polyesters, and germanium catalyzed polyesters.

[0015] In the polyester container of the present invention, the eluted antimony concentration may be less than 6 ppb.

[0016] In the polyester container of the present invention, the content of the recycled polyester in the polyester container may be 20 parts by mass or more and 95 parts by mass or less with respect to 100 parts by mass of the total amount of the resin material contained in the polyester container.

[0017] In the polyester container of the present invention, the cross-sectional thickness of the polyester container may be 0.05 mm or more and 0.54 mm or less.

[0018] The polyester container of the present invention may be a heating container.

[0019] The polyester preform of the present invention is a polyester preform for producing the above polyester container. Effect of the Invention

[0020] According to the present invention, it is possible to provide a polyester container which has a high reduction in environmental impact and is also highly hygienic. Furthermore, according to the present invention, it is possible to provide a polyester preform used in the production of the polyester container. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Diagram 2] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Diagram 3] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Figure 4] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Diagram 5] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Figure 6] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester container of the present invention. [Figure 7] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. [Figure 8] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. [Figure 9] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. [Figure 10] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. [Figure 11] FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. [Figure 12]FIG. 1 is a schematic half-sectional view showing one embodiment of a polyester preform of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] <Polyester container> 1 is a schematic half-sectional view showing one embodiment of a polyester container 10 of the present invention. In one embodiment, the polyester container 10 of the present invention has a mixed layer 22 as shown in FIG.

[0023] 2 and 3 are schematic half-sectional views showing one embodiment of the polyester container 10 of the present invention. In one embodiment, as shown in Fig. 2 and Fig. 3, the polyester container 10 of the present invention has a first layer 23 and a second layer 24, with the first layer 23 constituting the inner layer.

[0024] 4 to 6 are schematic half-sectional views showing one embodiment of the polyester container 10 of the present invention. In one embodiment, the polyester container 10 of the present invention has a first layer 23, a second layer 24, and a third layer 25, as shown in circle A in Figs. 4 to 6, with the first layer 23 forming the inner layer and the third layer 25 forming the outer layer.

[0025] In one embodiment, the polyester container 10 includes a mouth portion 11, a neck portion 12, a shoulder portion 13, a body portion 14, and a bottom portion 15, as shown in FIGS.

[0026] In one embodiment, the mouth portion 11 includes a threaded portion 16 to which a cap is screwed, a cap 17 below the threaded portion 16, and a support ring 18 below the cap 17, as shown in FIGS.

[0027] 1 to 6, the neck portion 12 is located between the support ring 18 and the shoulder portion 13, and has a generally cylindrical shape with a generally uniform diameter. In one embodiment, the shoulder portion 13 has a cylindrical shape whose diameter gradually increases from the neck portion 12 side toward the body portion 14 side.

[0028] In one embodiment, the body 14 is located between the shoulder 13 and the bottom 15 as shown in Figures 1 to 6. In one embodiment, the body 14 includes a panel 21 as shown in Figures 1 to 6. This configuration makes it possible to prevent deformation of the container due to an increase or decrease in internal pressure when filling a polyester container with heated contents or when the polyester container is heated after being filled with contents.

[0029] 1 to 6, in one embodiment, bottom 15 has a centrally located recessed portion 19 and a grounding portion 20 provided around recessed portion 19, and is connected to body 14 at grounding portion 20. With this configuration, it is possible to prevent deformation of the container due to an increase or decrease in internal pressure when filling a polyester container with heated contents or when the polyester is heated after being filled with contents. In one embodiment, the "bottom" refers to the part inside from the part that touches the ground when the polyester container is placed on its own.

[0030] In one embodiment, the second layer 24 is provided from the upper end of the mouth portion 11 to the bottom portion 15 as shown in FIGS. In one embodiment, the second layer 24 is provided in a portion of the polyester container, for example, from the lower end of the mouth 11 to the bottom 15, as shown in Fig. 6. When the first layer 23 and the third layer 25 are made of the same material, these layers become a single layer in the portion where the second layer 24 is not provided, as shown in Fig. 6.

[0031] The polyester container 10 of the present invention may have a vapor-deposited film on the surface of the mixed layer 22 or the first layer 23 (not shown).

[0032] The eluted antimony concentration of the polyester container of the present invention is preferably less than 6 ppb, and more preferably less than 3 ppb. By controlling the eluted antimony concentration to less than 6 ppb, the value recommended by the U.S. Food and Drug Administration (FDA) in 21 CFR (Chapter 21 of the Code of Federal Regulations) is met, which is preferable. In addition, depending on the type of contents filled in the polyester container of the present invention, there may be cases where the contents already contain a small amount of antimony. By setting the eluted antimony concentration of the polyester container to less than 3 ppb, it is possible to reduce the amount of antimony ultimately dissolved in the contents. In the present invention, the "eluted antimony concentration of a polyester container" is measured by filling a polyester container of the present invention with ultrapure water at 23°C, leaving it upright in an environment at 70°C for 14 days, and then removing the water from the polyester container.

[0033] The polyester container of the present invention preferably has a volume / weight of 5 mL / g or more and 50 mL / g or less, and more preferably 8 mL / g or more and 45 mL / g or less. By making the volume / weight of the polyester container 5 mL / g or more, the blow moldability of the polyester container can be improved, and the amount of polyester used can be prevented from becoming excessive, thereby reducing the amount of discarded polyester and further reducing the environmental impact. Furthermore, by setting the volume / weight of the polyester container to 50 mL / g or less, the strength of the polyester container can be improved.

[0034] The cross-sectional thickness of the polyester container of the present invention is preferably 0.05 mm or more and 0.54 mm or less, and more preferably 0.1 mm or more and 0.5 mm or less. By making the cross-sectional thickness 0.05 mm or more, the strength of the polyester container can be further improved. In addition, by making the cross-sectional thickness 0.54 mm or less, the blow moldability of the polyester container can be improved. In addition, the amount of polyester used can be prevented from becoming excessive, thereby reducing the environmental load. The cross-sectional thickness of the polyester container can be measured, for example, at the body of the polyester container, and refers to the point where the cross-sectional thickness is the thinnest.

[0035] The polyester container of the present invention can prevent antimony and the like from eluting into the contents even when the container is filled with high-temperature contents or when the container is heated after filling with the contents. As a result, the polyester container of the present invention has high hygiene and can be suitably used as a heating container.

[0036] (mixed layer) The polyester container of the present invention has a mixed layer, which is composed of a mixture of virgin polyester and recycled polyester. The virgin polyester in the mixed layer is a non-antimony polyester. By having the mixed layer, the polyester container of the present invention has a high environmental load reduction property and can suppress the elution of antimony into the contents, thereby making it possible to provide a polyester container with high hygiene. The polyester container of the present invention may be constructed of a single layer, or of two or more layers, or may be constructed of a combination of a single layer and a multilayer. When at least a portion of the polyester container of the present invention is constructed of a multilayer, the mixed layer constitutes the inner layer of the multilayer.

[0037] In the present invention, the term "polyester" refers to a polymer formed by ester bonds. Such a polyester is usually obtained by polycondensation of a dicarboxylic acid compound and a diol compound. Examples of dicarboxylic acid compounds include malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, dodecanedioic acid, eicosanedioic acid, pimelic acid, azelaic acid, methylmalonic acid, ethylmalonic acid, adamantanedicarboxylic acid, norbornenedicarboxylic acid, cyclohexanedicarboxylic acid, decalindicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5-sodiumsulfoisophthalic acid, phenylendanedicarboxylic acid, anthracenedicarboxylic acid, phenanthrenedicarboxylic acid, 9,9'-bis(4-carboxyphenyl)fluorene acid, and ester derivatives thereof. Examples of the diol compound include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butanediol, 2-methyl-1,3-propanediol, hexanediol, neopentyl glycol, cyclohexanedimethanol, cyclohexanediethanol, decahydronaphthalenedimethanol, decahydronaphthalenediethanol, norbornanedimethanol, norbornanediethanol, tricyclodecanedimethanol, tricyclodecaneethanol, tetracyclododecanedimethanol, tetracyclododecanediethanol, decalindimethanol, decalindiethanol, 5-methylol-5-ethyl- 2-(1,1-dimethyl-2-hydroxyethyl)-1,3-dioxane, cyclohexanediol, bicyclohexyl-4,4'-diol, 2,2-bis(4-hydroxycyclohexylpropane), 2,2-bis(4-(2-hydroxyethoxy)cyclohexyl)propane, cyclopentanediol, 3-methyl-1,2-cyclopentadiol, 4-cyclopentene-1,3-diol, adamantanediol, paraxylene glycol, bisphenol A, bisphenol S, styrene glycol, trimethylolpropane, pentaerythritol, and bis-β-hydroxyethyl terephthalate (BHET). The polyester is preferably polyethylene terephthalate or a modified polyethylene terephthalate obtained by polymerizing a raw material monomer of polyethylene terephthalate with a copolymerizable monomer.

[0038] As long as the characteristics of the present invention are not impaired, the polyester may contain monomers other than the dicarboxylic acid compound and the diol compound, but the content thereof is preferably 10 mol % or less, more preferably 5 mol % or less, and even more preferably 3 mol % or less, based on the total structural units.

[0039] In the present invention, the term "non-antimony catalyzed polyester" refers to a polyester obtained using a catalyst other than an antimony catalyst. In the polyester container of the present invention, the non-antimony catalyzed polyester of the mixed layer is preferably one or more polyesters selected from manganese catalyzed polyesters, titanium catalyzed polyesters, aluminum catalyzed polyesters, lithium catalyzed polyesters, and germanium catalyzed polyesters, and more preferably one or more polyesters selected from titanium catalyzed polyesters, aluminum catalyzed polyesters, and germanium catalyzed polyesters.

[0040] Examples of the manganese catalyst include fatty acid manganese salts such as manganese acetate, manganese carbonate, manganese chloride, manganese acetylacetonate salts, and manganese hydroxide. Examples of the titanium catalyst include titanium alkoxides such as tetra-n-propyl titanate, tetra-i-propyl titanate, tetra-n-butyl titanate, tetra-n-butyl titanate tetramer, tetra-t-butyl titanate, tetracyclohexyl titanate, tetraphenyl titanate, and tetrabenzyl titanate; titanium oxides obtained by hydrolysis of titanium alkoxides; titanium acetate, titanium oxalate, potassium titanium oxalate, sodium titanium oxalate, potassium titanate, sodium titanate, titanic acid-aluminum hydroxide mixtures, titanium chloride, titanium chloride-aluminum chloride mixtures, titanium bromide, titanium fluoride, potassium hexafluorotitanate, cobalt hexafluorotitanate, manganese hexafluorotitanate, ammonium hexafluorotitanate, and titanium acetylacetonate. Examples of aluminum catalysts include aluminum trisacetylacetate, aluminum monoacetylacetonate bis(ethylacetoacetate), and ethylacetoacetate aluminum diisopropylate. Examples of the lithium catalyst include ethyllithium, propyllithium, n-butyllithium, sec-butyllithium, tert-butyllithium, and phenyllithium. Examples of germanium catalysts include germanium dioxide, germanium tetroxide, germanium tetramethoxide, germanium tetraethoxide, germanium tetrapropoxide, germanium tetrabutoxide, germanium tetrapentoxide, and germanium tetrahexoxide.

[0041] In the present invention, the term "recycled polyester" refers to chemically recycled polyester or mechanically recycled polyester. Chemically recycled polyester refers to polyester obtained by breaking down polyester containers down to the monomer level and repolymerizing them. Mechanically recycled polyester refers to polyester obtained by sorting, crushing and washing polyester containers to remove contaminants and foreign matter to obtain flakes, and then treating the flakes for a certain period of time under high temperature and reduced pressure to remove contaminants inside the resin. In the present invention, the term "virgin polyester" refers to polyester that has not been subjected to the above-mentioned recycling treatment, that is, unused polyester.

[0042] In the polyester container of the present invention, the recycled polyester preferably has a ratio of isophthalic acid units to terephthalic acid units of 0.0005 or more and 0.010 or less, as determined by nuclear magnetic resonance spectroscopy. By setting the above ratio to 0.0005 or more, the melting point of the polyester can be lowered, and when producing a polyester container, melting of the polyester and injection molding of the container can be carried out at a lower temperature, thereby reducing energy consumption in producing the polyester container and further improving the reduction of the environmental load. Furthermore, by setting the above ratio to 0.010 or less, the water content of the polyester can be reduced, and clouding of the polyester container can be suppressed. In the polyester container of the present invention, the ratio is more preferably 0.0008 or more and 0.009 or less, and even more preferably 0.001 or more and 0.008 or less.

[0043] The nuclear magnetic resonance spectrum of the recycled polyester was measured using a nuclear magnetic resonance measurement device ( 1 The ratio of isophthalic acid units to terephthalic acid units in the recycled polyester was measured under the following conditions: 1 It can be determined from the H-NMR spectrum. That is, about 55 mg of a sample is dissolved in a mixed solvent of 10.35 mL of chloroform-d and 0.65 mL of 1,1,1,3,3,3,3-hexafluoro-2-propanol (HFIP), and measurement can be performed using a 400 MHz nuclear magnetic resonance apparatus under the following conditions. Chemical shift standard TMS: 0 ppm Measurement mode: Single pulse Pulse width 30° pulse (10μsec) Points: 64k Measurement range: 20ppm (-4~16ppm) Repeat time 5 seconds Total number of times: 64 Measurement temperature 40℃ Window function exponential Peak assignments are performed with reference to the NMR database of the Materials Information Station of the National Institute for Materials Science (http: / / polymer.nims.go.jp / NMR / ), and the ratios can be calculated from the peak area ratios.

[0044] In the polyester container of the present invention, the content of virgin polyester in the mixed layer is preferably 30 parts by mass or more and 95 parts by mass or less, and more preferably 50 parts by mass or more and 80 parts by mass or less, per 100 parts by mass of the total amount of the resin material in the mixed layer. By setting the content of the virgin polyester to 30 parts by mass or more, the elution of antimony into the contents can be further suppressed, and the sanitation of the polyester container can be further improved. By setting the content of the virgin polyester to 95 parts by mass or less, the content of the recycled polyester can be increased, and the environmental load of the polyester container can be further reduced.

[0045] In the polyester container of the present invention, the content of the recycled polyester is preferably 20 parts by mass or more and 95 parts by mass or less, and more preferably 25 parts by mass or more and 90 parts by mass or less, per 100 parts by mass of the total amount of the resin material contained in the polyester container. By setting the content of recycled polyester to 20 parts by mass or more per 100 parts by mass of the total amount of resin materials contained in the polyester container, the environmental load of the polyester container can be further reduced. By setting the content of recycled polyester to 95 parts by mass or less per 100 parts by mass of the total amount of resin materials contained in the polyester container, the hygienic properties of the polyester container can be further improved.

[0046] The mixed layer may contain additives, as long as they do not impair the characteristics of the present invention. Examples of such additives include oxygen absorbers, gas barrier resins (polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6)), plasticizers, UV stabilizers, color inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, thread friction reducers, slip agents, release agents, antioxidants, ion exchange agents, and color pigments.

[0047] (1st layer) In one embodiment, the polyester container of the present invention has a first layer constituting an inner layer, and the first layer is the above-mentioned mixed layer, which has a high environmental load reduction property and can suppress the elution of antimony into the contents, resulting in a polyester container with high hygiene. Details of the materials constituting the mixed layer have been described above and will not be repeated here.

[0048] In one embodiment, the first layer of the polyester container is provided in a content filling region. In the present invention, the "content filling region" refers to a region where the content contacts the polyester container when the polyester container is filled with the content and is in an upright state. In one embodiment, the first layer is provided from a position 5 to 70 mm below the upper end of the mouth to the bottom. Preferably, the first layer is provided from a position 5 to 15 mm below the upper end of the mouth to the bottom. By providing the first layer from a position 5 to 70 mm below the upper end of the mouth portion to the bottom, the first layer can cover the content filling area, and even in the case of a polyester container having a second layer, the second layer can be prevented from coming into contact with the contents, thereby further improving the hygiene of the polyester container. In addition, by providing the first layer from a position 5 to 70 mm below the top end of the mouth portion to the bottom, it is possible to effectively prevent the mouth portion from cracking during capping by an automatic machine.

[0049] In one embodiment, the first layer of the polyester container is located 70 mm below the top of the mouth to the bottom. Moreover, the first layer is preferably provided from a position 15 mm below the upper end of the mouth to the bottom, which allows the first layer to cover the content filling area, and even if the polyester container has a second layer, the second layer can be prevented from coming into contact with the content, thereby further improving the hygiene of the polyester container. Furthermore, in the polyester container of the present invention, it is further preferred that the first layer is provided from the upper end of the mouth to the bottom, which can further reduce contact of the second layer with the contents even when the container is stored at a temperature lying on its side in a vending machine or the like, thereby further improving the hygiene of the polyester container.

[0050] The thickness of the first layer in the polyester container is preferably 0.01 mm or more and 0.33 mm or less, more preferably 0.025 mm or more and 0.3 mm or less, and even more preferably 0.025 mm or more and 0.1 mm or less. By making the thickness of the first layer 0.01 mm or more, even in the case of a polyester container having a second layer, the second layer can be effectively prevented from coming into contact with the contents. Furthermore, by setting the thickness of the first layer to 0.33 mm or less, the proportion of the second layer in the polyester container can be increased, thereby further improving the reduction in environmental impact. The thickness of the first layer can be measured, for example, at the body of the polyester container, and refers to the location where the thickness of the first layer is the thinnest.

[0051] (2nd layer) In the polyester container of the present invention, the second layer is made of recycled polyester, which makes it possible to provide a polyester container with a high environmental load reduction property.

[0052] The second layer may contain additives, provided they do not impair the properties of the present invention. Examples of such additives include oxygen absorbers, gas barrier resins (polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6)), plasticizers, UV stabilizers, color inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, thread friction reducers, slip agents, release agents, antioxidants, ion exchange agents, and color pigments.

[0053] The thickness of the second layer in the polyester container is preferably 0.04 mm or more and 0.49 mm or less, more preferably 0.1 mm or more and 0.4 mm or less, and even more preferably 0.1 mm or more and 0.22 mm or less. By setting the thickness of the second layer to 0.04 mm or more, the proportion of the second layer in the polyester container can be increased, and the environmental load reduction of the polyester container can be further improved. Furthermore, by setting the thickness of the second layer to 0.49 mm or less, it is possible to prevent the second layer from being exposed to the contents during the production of the polyester preform. The thickness of the second layer can be measured, for example, at the body of the polyester container, and refers to the location where the thickness of the second layer is the thinnest.

[0054] (3rd layer) In one embodiment, the polyester container of the present invention may further have a third layer. The third layer constitutes the outer layer of the polyester container and is composed of a mixture of virgin polyester and recycled polyester. The virgin polyester of the third layer is a non-antimony catalyzed polyester. This constitution can improve the heat resistance and strength of the polyester container.

[0055] In the polyester container of the present invention, the non-antimony catalyzed polyester of the third layer is preferably one or more polyesters selected from manganese catalyzed polyesters, titanium catalyzed polyesters, aluminum catalyzed polyesters, lithium catalyzed polyesters, and germanium catalyzed polyesters, and more preferably one or more polyesters selected from titanium catalyzed polyesters, aluminum catalyzed polyesters, and germanium catalyzed polyesters.

[0056] Examples of the manganese catalyst include fatty acid manganese salts such as manganese acetate, manganese carbonate, manganese chloride, manganese acetylacetonate salts, and manganese hydroxide. Examples of the titanium catalyst include titanium alkoxides such as tetra-n-propyl titanate, tetra-i-propyl titanate, tetra-n-butyl titanate, tetra-n-butyl titanate tetramer, tetra-t-butyl titanate, tetracyclohexyl titanate, tetraphenyl titanate, and tetrabenzyl titanate; titanium oxides obtained by hydrolysis of titanium alkoxides; titanium acetate, titanium oxalate, potassium titanium oxalate, sodium titanium oxalate, potassium titanate, sodium titanate, titanic acid-aluminum hydroxide mixtures, titanium chloride, titanium chloride-aluminum chloride mixtures, titanium bromide, titanium fluoride, potassium hexafluorotitanate, cobalt hexafluorotitanate, manganese hexafluorotitanate, ammonium hexafluorotitanate, and titanium acetylacetonate. Examples of aluminum catalysts include aluminum trisacetylacetate, aluminum monoacetylacetonate bis(ethylacetoacetate), and ethylacetoacetate aluminum diisopropylate. Examples of the lithium catalyst include ethyllithium, propyllithium, n-butyllithium, sec-butyllithium, tert-butyllithium, and phenyllithium. Examples of germanium catalysts include germanium dioxide, germanium tetroxide, germanium tetramethoxide, germanium tetraethoxide, germanium tetrapropoxide, germanium tetrabutoxide, germanium tetrapentoxide, and germanium tetrahexoxide.

[0057] In the polyester container of the present invention, the content of the virgin polyester in the third layer is preferably 30 parts by mass or more and 95 parts by mass or less, and more preferably 50 parts by mass or more and 80 parts by mass or less, per 100 parts by mass of the total amount of the resin material in the third layer. By setting the content of the virgin polyester to 30 parts by mass or more, the heat resistance and strength of the polyester container can be further improved. By setting the content of the virgin polyester to 95 parts by mass or less, the content of the recycled polyester can be increased, and the environmental load of the polyester container can be further reduced.

[0058] The third layer may contain additives, as long as they do not impair the properties of the present invention. Examples of such additives include oxygen absorbers, gas barrier resins (polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6)), plasticizers, UV stabilizers, color inhibitors, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, thread friction reducers, slip agents, release agents, antioxidants, ion exchange agents, and color pigments.

[0059] The thickness of the third layer in the polyester container is preferably 0.01 mm or more and 0.1 mm or less, and more preferably 0.025 mm or more and 0.05 mm or less. By making the thickness of the third layer 0.01 mm or more, the heat resistance and strength of the polyester container can be further improved. Furthermore, by setting the thickness of the third layer to 0.1 mm or less, the proportion of the second layer in the polyester container can be increased, and the environmental load of the polyester container can be further reduced. The thickness of the third layer can be measured, for example, at the body of the polyester container, and refers to the location where the third layer is thinnest.

[0060] (evaporated film) The polyester container of the present invention may have a vapor-deposited film on the surface of the mixed layer or the first layer, thereby improving the gas barrier property of the polyester container.

[0061] Examples of the vapor-deposited film include vapor-deposited films composed of metals such as aluminum, inorganic oxides such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide, organic silicon compounds such as hexamethyldisiloxane, and hard carbon films such as DLC (Diamond Like Carbon) films. The hard carbon film made of DLC is also called i-carbon film or hydrogenated amorphous carbon film (aC:H), and is a hard carbon film. 3 It is an amorphous carbon film that is mainly composed of bonds.

[0062] The thickness of the deposited film is not particularly limited, and can be, for example, 1 nm or more and 150 nm or less.

[0063] The deposition film can be formed by a conventional method, for example, physical vapor deposition methods (PVD methods) such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition methods (CVD methods) such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0064] <Polyester preform> The polyester preform of the present invention is used for producing the polyester container of the present invention.

[0065] 7 is a schematic half-sectional view showing one embodiment of the polyester preform of the present invention. In one embodiment, the polyester preform 30 of the present invention has a mixed layer 37 as shown in FIG.

[0066] 8 and 9 are schematic half-sectional views showing one embodiment of the polyester preform of the present invention. In one embodiment, as shown in Fig. 8 and Fig. 9, the polyester preform 30 of the present invention has a first layer 38 and a second layer 39, and the first layer 38 constitutes an inner layer.

[0067] 10 to 12 are schematic half-sectional views showing one embodiment of a polyester preform of the present invention. In one embodiment, as shown in Fig. 10 to 12, a polyester preform 30 of the present invention has a first layer 38, a second layer 39, and a third layer 40, with the first layer 38 constituting an inner layer and the third layer 40 constituting an outer layer.

[0068] In one embodiment, a polyester preform 30 of the present invention includes a mouth portion 31, a body portion 32, and a bottom portion 33, as shown in FIGS. In one embodiment, the mouth 31 corresponds to the mouth 11 of the polyester container 10 described above, and has approximately the same shape as the mouth 11. In one embodiment, the body 32 corresponds to the neck 12, shoulder 13, and body 14 of the polyester container 10 described above, and has an approximately cylindrical shape. In one embodiment, the bottom 33 corresponds to the bottom 15 of the polyester container 10 described above, and has an approximately hemispherical shape. In one embodiment, the mouth portion 31 includes a threaded portion 34 to which a cap is screwed, a cap 35 below the threaded portion 34, and a support ring 36 below the cap 35, as shown in Figs.

[0069] In one embodiment, the second layer 39 is provided from the lower end of the bottom portion 33 to the upper end of the mouth portion 31 as shown in FIGS. In one embodiment, the second layer 39 is provided on a part of the polyester preform, for example, from the lower end of the bottom portion 33 to the lower end of the mouth portion 31, as shown in Fig. 12. When the first layer 38 and the third layer 40 are made of the same material, as shown in Fig. 12, these layers become a single layer in the area where the second layer 39 is not provided.

[0070] The cross-sectional thickness of the polyester preform of the present invention is preferably 1.3 mm or more and 4.7 mm or less, and more preferably 2.1 mm or more and 4.0 mm or less. By making the cross-sectional thickness within the above range, the polyester container as described above can be obtained. The cross-sectional thickness of the polyester preform can be measured, for example, at the body of the polyester preform, and refers to the location where the cross-sectional thickness is the thinnest.

[0071] In the polyester preform of the present invention, the content of the recycled polyester is preferably 20 parts by mass or more and 95 parts by mass or less, and more preferably 25 parts by mass or more and 90 parts by mass or less, relative to 100 parts by mass of the total amount of the resin materials contained in the polyester preform. By setting the content of the recycled polyester within the above range, the polyester container as described above can be obtained.

[0072] (mixed layer) The material constituting the mixed layer in the polyester preform may be the same as the material constituting the mixed layer in the polyester container. The polyester preform of the present invention may be configured with a single layer, or with two or more layers, or may be configured with a combination of a single layer and a multilayer. When at least a part of the polyester preform of the present invention is configured with a multilayer, the mixed layer constitutes an inner layer of the multilayer.

[0073] (1st layer) The material constituting the first layer of the polyester preform may be the same as the material constituting the first layer of the polyester container.

[0074] In one embodiment, as shown in Figures 8 and 10, when the distance from the lower end of the bottom 33 to the upper end of the mouth 31 is L, the first layer 38 is provided in a range of 0.4L to 0.97L from the lower end of the polyester preform 30. Since the first layer 38 is provided within a range of 0.4 L or more from the lower end of the bottom 33, when the polyester preform is blow molded to form a polyester container, the first layer can cover the content filling area, and even when a polyester container is formed with a second layer, the second layer can be prevented from coming into contact with the contents, thereby further improving the hygiene of the polyester container. Furthermore, since the first layer 38 is provided within a range of 0.97 L or less from the lower end of the bottom 33, when the polyester preform is blow molded into a polyester container, cracks at the mouth can be effectively prevented from occurring when capping is performed by an automatic machine.

[0075] In one embodiment, the first layer may be provided from the lower end of the base to the upper end of the mouth, or from the lower end of the base to the lower end of the mouth.

[0076] The thickness of the first layer in the polyester preform is preferably 0.1 mm or more and 2.9 mm or less, more preferably 0.2 mm or more and 2.0 mm or less. In addition, when the polyester preform has a third layer, the thickness of the first layer in the polyester preform is preferably 0.05 mm or more and 1.5 mm or less, more preferably 0.1 mm or more and 1.0 mm or less. By setting the thickness of the first layer in the polyester preform within the above range, the polyester container as described above can be obtained. The thickness of the first layer in the polyester preform can be measured, for example, at the body portion of the polyester preform, and means the point where the thickness of the first layer is the thinnest.

[0077] (2nd layer) The material constituting the second layer of the polyester preform may be the same as the material constituting the second layer of the polyester container.

[0078] The thickness of the second layer in the polyester preform is preferably 0.5 mm or more and 4.3 mm or less, and more preferably 1.9 mm or more and 4.0 mm or less. In addition, when the polyester preform has a third layer, the thickness of the second layer in the polyester preform is preferably 0.4 mm or more and 3.7 mm or less, and more preferably 1.6 mm or more and 3.4 mm or less. By setting the thickness of the second layer in the polyester preform within the above range, the polyester container as described above can be obtained. The thickness of the second layer in the polyester preform can be measured, for example, at the body portion of the polyester preform, and means the point where the thickness of the second layer is the thinnest.

[0079] (3rd layer) The material constituting the third layer in the polyester preform may be the same as the material constituting the third layer in the polyester container.

[0080] The thickness of the third layer in the polyester preform is preferably 0.05 mm or more and 1.5 mm or less, and more preferably 0.1 mm or more and 1.0 mm or less. By setting the thickness of the third layer in the polyester preform in the above range, the polyester container as described above can be obtained. The thickness of the third layer in the polyester preform can be measured, for example, in the body portion of the polyester preform, and means the point where the thickness of the third layer is the thinnest.

[0081] <Manufacturing method of polyester containers> In one embodiment, the polyester container shown in FIG. 1 can be produced by preparing a polyester preform by injection molding the material constituting the mixed layer described above, and then blow molding the same.

[0082] In one embodiment, the polyester container of the present invention can be manufactured by producing a polyester preform by co-injection molding the materials constituting the first and second layers described above, and then blow molding the polyester preform. The position of each layer can be adjusted by the injection molding conditions such as the resin temperature.

[0083] Moreover, the polyester container shown in FIG. 2 can also be produced by utilizing two-color molding or insert molding. Furthermore, the polyester container shown in FIG. 2 etc. can be produced by injection molding a mixture of virgin polyester and recycled polyester into an inner mold to form a first layer, retracting the inner mold to provide a gap between the inner mold and the first layer, and then injection molding recycled polyester into this gap to form a second layer.

[0084] In one embodiment, the polyester container of the present invention shown in Figs. 4 to 6 can be produced by producing a polyester preform by co-injection molding the materials constituting the first layer, second layer, and third layer described above, and then blow molding the same. When the second layer is formed in a part of the preform, it is preferable to use the hot runner nozzle disclosed in JP 2008-94454 A.

[0085] Moreover, the polyester container shown in FIG. 4 can also be produced by utilizing three-color molding or insert molding. Furthermore, the polyester container shown in FIG. 4 etc. can be produced by injection molding a mixture of virgin polyester and recycled polyester into an inner mold to form a first layer, retracting the inner mold to provide a gap between the inner mold and the first layer, injection molding recycled polyester into this gap to form a second layer, retracting the inner mold to provide a gap between the inner mold and the first and second layers, and injection molding a mixture of virgin polyester and recycled polyester into this gap to form a third layer. EXAMPLES

[0086] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0087] <Measurement conditions for nuclear magnetic resonance spectrum ( 1 H-NMR) Equipment: AVENCEIIIHD400MHz (Bruker) Probe PA BBO 400S1 BBF-H-D05 Z SP (manufactured by Bruker) Chemical shift standard TMS: 0 ppm Measurement mode: Single pulse Pulse width 30° pulse (10μsec) Points: 64k Measurement range: 20ppm (-4~16ppm) Repeat time 5 seconds Total number of times: 64 Measurement temperature 40℃ Window function exponential Solvent: Chloroform-d1 / HFIP mixed solvent

[0088] Example 1 A mechanically recycled polyester (hereinafter also referred to as mechanically recycled polyester A) was prepared, which had been stored in a storage facility for 6 months and had a ratio of isophthalic acid units to terephthalic acid units of 0.006 as determined by nuclear magnetic resonance spectroscopy. Also prepared was a virgin polyester (germanium-catalyzed PET, J-125S, manufactured by Mitsui Chemicals, Inc.). 75 parts by mass of virgin polyester and 25 parts by mass of mechanically recycled polyester A were mixed and heated to melt. The melt was injected using an injection molding machine to produce a single-layer polyester preform having a mixed layer composed of a mixture of virgin polyester and mechanically recycled polyester A, as shown in FIG. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0089] Next, the polyester preform was heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL as shown in Figure 1. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0090] Example 2 A single-layer polyester preform as shown in FIG. 7 was produced in the same manner as in Example 1, except that a mixture of 50 parts by mass of the virgin polyester and 50 parts by mass of the mechanically recycled polyester A was used. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0091] Next, the polyester preform was heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL as shown in Figure 1. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0092] Example 3 A mechanically recycled polyester (hereinafter also referred to as mechanically recycled polyester B) was prepared, which had been stored in a storage facility for 6 months and had a ratio of isophthalic acid units to terephthalic acid units of 0.003 as determined by nuclear magnetic resonance spectroscopy. A single-layer polyester preform was produced in the same manner as in Example 1, except that the mechanically recycled polyester A was changed to the mechanically recycled polyester B. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0093] Next, the polyester preform was heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL as shown in Figure 1. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0094] Example 4 A single-layer polyester preform as shown in FIG. 7 was produced in the same manner as in Example 1, except that a mixture of 50 parts by mass of the virgin polyester and 50 parts by mass of the mechanically recycled polyester B was used. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0095] Next, the polyester preform was heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL as shown in Figure 1. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0096] Example 5 The above virgin polyester and mechanically recycled polyester A were prepared. 75 parts by mass of the virgin polyester and 25 parts by mass of the mechanically recycled polyester A were mixed and heated to melt. Separately, only the mechanically recycled polyester A was heated to melt. These were co-injected using an injection molding machine to produce a multi-layer (two-layer, two-kind) polyester preform shown in FIG. 9, which has a first layer composed of a mixture of the virgin polyester and the mechanically recycled polyester A and a second layer composed of the mechanically recycled polyester A. The amount of mechanically recycled polyester A used was adjusted to 85 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0097] Next, the polyester preform was heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL as shown in Figure 3. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0098] Example 6 A multilayer (two-layer, two-kind) polyester preform shown in FIG. 9 was produced in the same manner as in Example 5, except that the first layer was formed using a mixture of 50 parts by mass of the virgin polyester and 50 parts by mass of mechanically recycled polyester A. The amount of mechanically recycled polyester A used was adjusted to 90 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0099] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 3. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0100] Example 7 A multilayer (two-type, two-layer) polyester preform shown in FIG. 9 was produced in the same manner as in Example 5, except that the mechanically recycled polyester A was changed to the mechanically recycled polyester B to form the first and second layers. The amount of mechanically recycled polyester B used was adjusted to 85 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0101] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 3. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0102] Example 8 A multilayer (two-layer, two-kind) polyester preform shown in FIG. 9 was produced in the same manner as in Example 7, except that the first layer was formed using a mixture of 50 parts by mass of the virgin polyester and 50 parts by mass of mechanically recycled polyester B. The amount of mechanically recycled polyester B used was adjusted to 90 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0103] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 3. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0104] Example 9 The above virgin polyester and mechanically recycled polyester A were prepared. 75 parts by mass of the virgin polyester and 25 parts by mass of the mechanically recycled polyester A were mixed and heated to melt. Separately, only the mechanically recycled polyester A was heated to melt. These were co-injected using an injection molding machine to produce a multi-layer (two-kind, three-layer) polyester preform shown in FIG. 11, which includes a first layer composed of a mixture of the virgin polyester and the mechanically recycled polyester A, a second layer composed of the mechanically recycled polyester A, and a third layer composed of a mixture of the virgin polyester and the mechanically recycled polyester A. The amount of mechanically recycled polyester A used was adjusted to 63 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0105] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 5. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0106] Example 10 A multilayer (two-kind, three-layer) polyester preform shown in FIG. 11 was produced in the same manner as in Example 9, except that the first and third layers were formed using a mixture of 50 parts by mass of the above virgin polyester and 50 parts by mass of mechanically recycled polyester A. The amount of mechanically recycled polyester A used was adjusted to 75 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0107] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 5. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0108] Example 11 A multilayer (two-kind, three-layer) polyester preform shown in FIG. 11 was produced in the same manner as in Example 9, except that the mechanically recycled polyester A was changed to the mechanically recycled polyester B to form the first, second, and third layers. The amount of mechanically recycled polyester B used was adjusted to 63 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0109] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 5. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0110] Example 12 A multilayer (two-kind, three-layer) polyester preform shown in FIG. 11 was produced in the same manner as in Example 11, except that the first and third layers were formed using a mixture of 50 parts by mass of the above virgin polyester and 50 parts by mass of mechanically recycled polyester B. The amount of mechanically recycled polyester B used was adjusted to 75 parts by mass per 100 parts by mass of the resin material constituting the polyester preform. The body of the polyester preform had a thickness of 3.5 mm and a weight per unit area of ​​22 g.

[0111] The polyester preform was then heated to 110°C and subjected to biaxial stretch blow molding in a blow molding die to obtain a multi-layer polyester container with a capacity of 500 mL and the shape shown in Figure 5. The cross-sectional thickness of the body of the polyester container was 0.32 mm. No cloudiness was observed in the obtained polyester container.

[0112] Comparative Example 1 Mechanically recycled polyester A was prepared. It was melted and injected into an injection molding machine to produce a single-layer polyester preform. The weight per unit area was 22 g. Next, the single-layer polyester preform was heated to 110° C. and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL.

[0113] Comparative Example 2 Except for using the above virgin polyester, a single-layer polyester preform was produced in the same manner as in Comparative Example 1. The basis weight was 22 g. Next, the single-layer polyester preform was heated to 110° C. and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL.

[0114] Comparative Example 3 A single-layer polyester preform was produced in the same manner as in Comparative Example 1, except that virgin polyester (antimony-catalyzed PET, manufactured by Shinko Gohsen, 5015W) was used. The basis weight was 22 g. Next, the single-layer polyester preform was heated to 110° C. and subjected to biaxial stretch blow molding in a blow molding die to obtain a single-layer polyester container with a capacity of 500 mL.

[0115] <<Evaluation of eluted antimony concentration>> The containers obtained in the above Examples and Comparative Examples were filled with 480 mL of ultrapure water. In each container, the ultrapure water was filled from a position 28.7 mm from the top end of the mouth to the bottom. Next, the sample was placed in a hot water heater set at 70° C. and left standing upright for 14 days. After the container was left to stand, the water was removed and its antimony concentration was measured by inductively coupled plasma mass spectrometry (ICP-MS). The measurement results are shown in Table 1.

[0116] <<Reduced environmental impact>> Based on the content of recycled polyester per 100 parts by mass of the total amount of the resin material contained in the containers obtained in the above Examples and Comparative Examples, the level of environmental load reduction was defined as follows. OK: Recycled polyester content is 20 parts by mass or more NG: Recycled polyester content is less than 20 parts by mass

[0117] [Table 1]

[0118] As is clear from the above table, the polyester container of the present invention has excellent environmental load reducing properties. Furthermore, it is clear that the polyester container of the present invention can effectively reduce the concentration of eluted antimony after heating, and can be suitably used as a heating container. [Explanation of symbols]

[0119] 10: Polyester container 11: Mouth 12: Neck 13:Shoulder 14: Torso 15: Bottom 16: Screw part 17: Turnip 18: Support ring 19: Depression 20: Grounding part 21: Panel section 22: Mixed layer 23: 1st layer 24:Second layer 25:Third layer 30: Polyester preform 31: Mouth 32: Torso 33: Bottom 34: Screw part 35: Turnip 36: Support ring 37: Mixed layer 38: 1st layer 39:Second layer 40:Third layer

Claims

[Claim 1] A polyester container having a mixed layer, The mixed layer is composed of a mixture of virgin polyester and recycled polyester, A polyester container, wherein the virgin polyester is a non-antimony catalyzed polyester.

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