JP2000062007A - Polyester resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester resin container consisting of a resin compsn. prepd. by compounding a thermoplastic polyester resin with an inorg. compd. with UV light absorbing properties and a dispersant or a polyester resin container being a multi-layer polyester resin container provided with at least one layer consisting of the resin compsn. and with excellent UV absorbing properties and transparency. SOLUTION: A monolayer or multi-layer transparent polyester resin container is obtd. by providing at least one layer of a layer consisting of a resin compsn. prepd. by compounding 0.01-3.0 pt.wt. inorg. compd. with UV absorbing properties to 100 pts.wt. thermoplastic resin and a dispersant in the thermoplastic polyester resin.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to at least a polyester resin container made of a resin composition obtained by blending a thermoplastic polyester resin with an inorganic compound having an ultraviolet absorbing ability and a dispersant, or a layer made of the resin composition. The present invention relates to a multilayer polyester resin container having one layer. More specifically, a thermoplastic polyester resin is blended with an inorganic compound having a UV-absorbing ability and a dispersant and added to the polyester resin container made of a resin composition, or at least one layer made of the resin composition is provided. The present invention relates to a polyester resin container having excellent ultraviolet absorbing ability and transparency.

[0002]

2. Description of the Related Art Conventionally, plastic molding products include packaging materials typified by containers for food, beverages, toiletries, cosmetics, mechanical materials, electrical / electronic materials, optical materials, building materials, etc. It is used in a wide range of fields. Various additives are added to such a plastic molded article in order to impart functionality depending on the purpose of use,
An example thereof is an ultraviolet absorber.

Ultraviolet rays refer to electromagnetic waves having a wavelength of 100 to 400 nm, and the energy of light in this region is C, H,
O binding energy (70 to 110 kcal / mol)
Has the same energy as. Therefore, mainly C,
A plastic molded product composed of a bond of H and O may be broken by the irradiation of ultraviolet rays, resulting in deterioration of resin, discoloration, and deterioration of mechanical strength. On the other hand, not only plastic molded products but also contents to be packed in packaging materials, especially toiletries and cosmetics, may be discolored, deteriorated, or decomposed by the irradiation of ultraviolet rays.

In order to solve such a problem, the above-mentioned ultraviolet absorber is blended in the plastic molded product. Organic UV absorbers are commonly used as UV absorbers, and typical examples thereof include phenyl salicylate, 2-hydroxy-4methoxybenzophenone, and 2 (2'-hydroxy-5methylphenyl) benzotriazole. Is mentioned. It is possible to impart an ultraviolet absorbing ability by kneading an organic ultraviolet absorber into a plastic molded product.

However, the organic ultraviolet absorber has a problem that the molded product is colored due to its ultraviolet absorbing mechanism. In a plastic molded product, this coloring problem may be accompanied by a poor appearance, and it is desirable to avoid it. Therefore, there are increasing cases where inorganic UV absorbers are used in place of these organic UV absorbers. Typical of these are zinc oxide,
Examples thereof include titanium oxide, cerium oxide and iron oxide.

However, the surface tension of these inorganic compounds is smaller than that of plastics, and the interaction between the inorganic compounds and the plastic is originally low. Therefore, if the fine particles of the inorganic compound are added during plasticizing and kneading of the plastic, the following problems occur. Will occur.

Generally, the particle size of primary particles of an inorganic compound called ultrafine particles is on the order of several nm, and the size thereof is not more than the wavelength of visible light. If this inorganic compound is dispersed in the plastic in the form of primary particles, the problem of lowering the transparency of the plastic molded product does not occur. However, such an inorganic compound is usually added to a plastic in a state of secondary particles in which primary particles are aggregated and melt-kneaded. In addition, if the inorganic compound fine particles are added during plasticizing and kneading the plastic, the dispersibility of the inorganic compound particles in the plastic decreases due to the interaction between the particles during the kneading, and aggregation of primary particles or secondary particles occurs, Secondary particles having a dispersed particle size of several μm to several tens of μm are generated. When the particle size of the inorganic compound dispersed in the plastic is on the order of μm, visible light is scattered by the inorganic compound, resulting in a problem that the transparency of the plastic molded product is significantly reduced. Further, the secondary agglomerated particles are dispersed means that more inorganic compound is added than the addition amount at which the effect of adding the inorganic compound is obtained,
As a result, it costs money.

[0008] Inorganic UV absorbers are kneaded into various plastics as UV absorbers because of their excellent UV absorbing ability. However, when they are melt-kneaded with plastics, secondary agglomeration occurs, and as a result, , Reduce the transparency of plastic molded products. In particular, in the case of molded products made of a resin having excellent transparency such as thermoplastic polyester resin,
At present, it is desired to disperse the inorganic ultraviolet absorber in the finest possible state and maintain high transparency.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to consider the above-mentioned situation, and a polyester comprising a resin composition prepared by blending a thermoplastic polyester resin with an inorganic compound having an ultraviolet absorbing ability and a dispersant. It is an object of the present invention to provide a resin container or a multilayer polyester resin container in which at least one layer made of the resin composition is provided and which is excellent in ultraviolet absorbing ability and transparency.

[0010]

The present invention has been conceived in order to solve the above-mentioned problems. The invention according to claim 1 is characterized in that an inorganic compound having an ultraviolet absorbing ability is contained in a thermoplastic polyester resin. Transparency of a single layer or multiple layers, wherein at least one layer made of a resin composition containing 0.01 to 3.00 parts by weight and a dispersant is provided for 100 parts by weight of the thermoplastic polyester resin. And a polyester resin container having

According to a second aspect of the present invention, in the first aspect, the ratio R of the added amount of the inorganic compound and the added amount of the dispersant (R = the added amount of the dispersant / the added amount of the inorganic compound) is 0.1 ≦ R ≦ 5. It is a polyester resin container characterized by being present.

According to a third aspect of the present invention, in the first or second aspect, at least one of zinc oxide, titanium oxide, cerium oxide and iron oxide is used as the inorganic compound having an ultraviolet absorbing ability.
Polyester resin container characterized by containing seeds,
It is what

The invention according to claim 4 is the method according to claim 1, 2 or 3, wherein as the dispersant, a higher fatty acid or a metal salt thereof, an ester, an amide, or a low molecular weight polyolefin wax or an acid modified product or a copolymer thereof is used. And a polyester resin container containing at least one kind of.

The invention according to claim 5 is the invention as claimed in claims 1, 2, and 3.
Or 4, the average primary particle diameter of the inorganic compound having an ultraviolet absorbing ability mixed with the thermoplastic polyester resin is 1
A polyester resin container characterized by being fine particles of 0 to 100 nm.

The invention according to claim 6 is the invention according to claims 1, 2 and
When the thickness of a container made of a resin composition obtained by blending the thermoplastic polyester resin according to 3, 4, or 5 with an inorganic compound having an ultraviolet absorbing ability and a dispersant is 2 mm,
A polyester resin container having a light transmittance of 75% or more at a wavelength of 700 nm and 20% or less at a wavelength of 360 nm.

The invention according to claim 7 is the invention as defined in claims 1, 2 and
A haze value of 50% is obtained when the thickness of a container made of a resin composition prepared by mixing the thermoplastic polyester resin described in 3, 4, 5 or 6 with an inorganic compound having an ultraviolet absorbing ability and a dispersant is 2 mm. A polyester resin container characterized by the following.

The invention described in claim 8 is,
The polyester resin container according to 3, 4, 5, 6 or 7
A polyester resin container characterized by being obtained by injection molding, blow molding, or injection molding and stretch blow molding.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be described in detail below.

In the thermoplastic polyester resin of the present invention, the acid component is at least one of terephthalic acid, isophthalic acid, naphthalene 2,6 dicarboxylic acid, succinic acid, adipic acid, succinic acid and sebacic acid.
The diol component is polymerized with at least one kind of glycols such as ethylene glycol, propylene glycol, butylene glycol and 1,4-cyclohexanedimethanol, or polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol. It is configured by Further, as the other acid component, diphenylsulfone dicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, azelaic acid or the like can be selected, and the diol component is also neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethylol, 2,2-bis (4-β-hydroxyethoxyphenyl) propane, 1,4-bis (β-hydroxyethoxy) benzene and the like can be mentioned.

Further, the thermoplastic polyester resin of the present invention may be a polyester resin composition composed of a polymer of oxyacid or a copolymer of oxyacid, and lactic acid, ε-caprolactone and p-oxybenzoic acid can be used as the oxyacid. Various kinds of acid, p-β-hydroxyethoxybenzoic acid, etc. can be selected.

Typical examples of the above-mentioned thermoplastic polyester resin include polyethylene terephthalate resin (hereinafter PET) and polyethylene naphthalate resin (hereinafter PE).
N) and other aromatic polyester resins, polyethylene succinate resins, polybutylene succinate resins and other aliphatic polyester resins, polylactic acid resins, oxyacid polymers such as polycaprolactone resins, or aromatic polyester resins. A polyester elastomer obtained by copolymerizing oxyalkylene glycol can also be used, and a blend of two or more of these may be used, but it has excellent mechanical properties, chemical resistance, heat resistance, etc., and is stretched or heat-set. Since PET can improve rigidity and dimensional stability, etc., PET is particularly preferably used.

Examples of the inorganic compound having an ultraviolet absorbing ability in the present invention include zinc oxide, titanium oxide, cerium oxide and iron oxide, and any one kind or a mixture of two or more kinds may be used. However, zinc oxide is particularly preferable because iron oxide absorbs light in the visible light region and turns slightly red, and titanium oxide and cerium oxide are inferior in ultraviolet absorbing effect to zinc oxide. In addition, the average primary particle size of the inorganic compound represented by zinc oxide is 10 to 100 in consideration of the ultraviolet absorbing ability when blended with the thermoplastic polyester resin.
It is preferable that the particles are nano-sized particles. The surface of the inorganic compound may be surface-treated with an inorganic compound such as silica or an organic substance such as stearic acid, if necessary, for the purpose of suppressing photocatalytic activity or improving dispersibility in plastic. It doesn't matter.

The amount of the inorganic compound having an ultraviolet absorbing ability added to the thermoplastic polyester resin is preferably 0.01 to 3.00 parts by weight with respect to 100 parts by weight of the thermoplastic resin polyester. When the amount is less than 0.01 part by weight, the transparency is comparable to that of the blank, but the ultraviolet absorption ability is poor. Further, when it is more than 3.00 parts by weight, the ultraviolet absorbing ability is excellent, but the transparency as compared with the blank is remarkably lowered. In that sense, the addition amount of the inorganic compound is 0.01 with respect to 100 parts by weight of the thermoplastic polyester resin.
The amount of the inorganic compound is preferably adjusted to 3.00 parts by weight, but the addition amount of the inorganic compound is preferably adjusted according to the required ultraviolet absorbing ability and the thickness of the sample.

A dispersant is added in order to improve the dispersibility of the inorganic compound having an ultraviolet absorbing ability in the thermoplastic polyester resin. The dispersant in the present invention improves the dispersibility of an inorganic compound, and a pigment dispersant is preferably used as titanium oxide, which is an inorganic compound, is used as a pigment. Examples of such pigment dispersants include higher fatty acids such as stearic acid, metal salts thereof, esters and amides. In addition to such dispersants, the molecular weight measured by the viscosity method is 500
You may use any 1 type, or 2 or more types of mixture from the low molecular weight polyolefin wax of about 10,000 to 10000, its acid modification product, and the copolymer with various monomers. Further, even a dispersant having a relatively high molecular weight can be used as long as it is decomposed when an inorganic compound is kneaded into a resin in a molten state, and the decomposition product thereof exhibits an effect as a dispersant. .

The addition amount of the dispersant is preferably such that the ratio R of the addition amount of the dispersant and the addition amount of the inorganic compound (R = the addition amount of the dispersant / the addition amount of the inorganic compound) is 0.1 ≦ R ≦ 5. If it is larger than 5 (there is a large amount of dispersant), the average molecular weight of the resin composition itself may be lowered, and the mechanical strength may be lowered, or the processability may be lowered. On the other hand, if the amount is less than 0.1 (the amount of the dispersant is small), the dispersed state of the inorganic compound having the ultraviolet absorbing ability is lowered, and the transparency of the container made of the resin composition may be lowered.

The dispersion state of the inorganic compound having an ultraviolet absorbing ability in the present invention is preferably the smaller the amount of the inorganic compound dispersed in the μm order, that is, the nm order. Furthermore, in order to maintain the transparency of the resin to which the inorganic compound is not added, it is preferable that the maximum particle size is 400 nm or less. However, the decrease in transparency due to the addition of the inorganic compound is
Since the scattering of light by the inorganic compound is the cause, it is possible to suppress the addition amount of the inorganic compound and improve the transparency according to the actual thickness of the container and the required physical properties.

The light transmission properties of the polyester resin container of the present invention have an ultraviolet absorbing ability and a high transparency, and therefore depend on molding conditions, but when the container made of the resin composition of the present invention has a thickness of 2 mm, Light transmittance at wavelength 700nm is 7
5% or more, 40% light transmittance at a wavelength of 360 nm
The following is preferable. If the light transmittance at a wavelength of 700 nm is 74% or less, the transparency is poor, and the wavelength is 360 nm.
If the light transmittance of the above is 41% or more, the ultraviolet absorbing ability is poor. More preferably, the light transmittance at a wavelength of 200 to 300 nm is 10% or less, and the light transmittance at a wavelength of 400 to 699 nm is 50 to 100%. Wavelength 200-30
When the light transmittance of 0 nm is 11% or more, the ultraviolet absorbing ability is poor, and when the light transmittance of wavelength 400 to 700 nm is 49% or less, the transparency is poor. However, this thickness is 2 mm
In this case, the evaluation method is not limited, and it is preferable to maintain the ultraviolet absorbing ability and the high transparency regardless of the thickness.

As a transparency index, a haze value represented by the ratio of total light transmittance to diffuse transmittance is typical in addition to the above-mentioned light transmittance. However, the haze value varies greatly not only with the dispersed particle size of the inorganic compound, but also with the sample thickness, the sample surface state, and the crystallinity of the base resin (crystallinity, spherulite size, orientation, etc.). If transparency is required, the haze is preferably 50% or less when the thickness of the polyester resin container of the present invention is 2 mm. Particularly in the case of a resin having good transparency such as PET, the haze value is preferably 30% or less, more preferably 20% or less, further preferably 10% or less. Since the evaluation method in the case of the thickness of 2 mm is not limited, it is preferable to maintain the ultraviolet absorbing ability and the high transparency regardless of the thickness.

The method for producing the polyester resin container of the present invention is carried out by first melt-kneading a thermoplastic polyester resin, a predetermined amount of an inorganic compound and a dispersant by dry blending to obtain a polyester resin composition. Be seen. When performing this melt-kneading, various kneaders such as a single-screw extruder, a twin-screw extruder, or a Brabender type kneader can be used. Secondly, a container made of the resin composition is obtained by injection molding, blow molding, or injection molding and stretch blow molding, but it is also possible to use molding methods such as sheet molding and vacuum molding. In addition, a masterbatch in which a high content of an inorganic compound and a dispersant are mixed in advance is prepared using the above kneader,
It is preferable that the inorganic compound and the dispersant are dry-blended so as to have a concentration within the above-mentioned range, and are preferably formed by these molding methods.

The polyester resin container of the present invention may be a single layer container made of a resin composition obtained by blending a thermoplastic polyester resin with an inorganic compound having an ultraviolet absorbing ability and a dispersant. It is also preferable to use a multilayer polyester resin container having at least one composition layer. The resin composition layer may be present at any position in the multilayer polyester resin container depending on the purpose, and may be two or more layers. For example, it may be the outermost layer, the innermost layer, or the intermediate layer. Examples of the multilayer resin include an inorganic compound, a natural thermoplastic polyester resin containing no dispersant, polyamide, an ethylene-vinyl acetate copolymer saponified product, polyvinylidene chloride, a polyolefin, and the like. When the adhesiveness with the physical layer is poor, it is preferable to provide an adhesive layer between them. As described above, the thickness of the ultraviolet absorbing resin composition layer is set so as to satisfy the ultraviolet absorbing ability and high transparency, and the thickness of the other resin layers depends on the required quality such as transparency and barrier property. It is preferable to determine by Regarding the ultraviolet absorbing ability of the multilayer polyester resin container of the present invention, the ultraviolet absorbing ability of the ultraviolet absorbing resin composition layer is reflected, and the transparency is
Although the transparency is somewhat lowered due to the influence of the resin layer interface due to the multi-layering, the high transparency can be maintained by forming the multi-layering with the highly transparent resin.

[0031]

EXAMPLES Examples of the present invention will be shown below, but the technical scope of the present invention is not limited to these examples.

<Example 1> PET was used as the thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as the inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as the dispersant. At this time, the addition amount of zinc oxide was set to 0.2 parts by weight with respect to 100 parts by weight of PET, and the dispersant was set to 0.2 parts by weight (R = dispersing agent adding amount / inorganic compound adding amount = 1). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, the pellet was used to obtain a container of Example 1 having an average thickness of 0.8 mm and a volume of 150 ml by injection molding.

Example 2 PET was used as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as an inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as a dispersant. At this time, the amount of zinc oxide added was set to 0.5 parts by weight relative to 100 parts by weight of PET, and the dispersant was set to 0.5 parts by weight (R = dispersant added amount / inorganic compound added = 1). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, using this pellet, a container of Example 2 having an average wall thickness of 0.8 mm and a volume of 150 ml was obtained by injection molding.

Example 3 PET for direct blowing was used as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as an inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as a dispersant. At this time, the added amount of zinc oxide is PET10.
0.3 parts by weight and 0,15 parts by weight of the dispersant were set to 0 parts by weight (R = amount of dispersant added / amount of inorganic compound added = 0.5). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, by using this pellet, the average thickness of the body was 0.8 mm and the volume was 8 by blow molding.
A 00 ml bottle of Example 3 was obtained.

Example 4 PET was used as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as an inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as a dispersant. At this time, the added amount of zinc oxide was set to 1.0 part by weight with respect to 100 parts by weight of PET, and the dispersant was set to 1.0 part by weight (R = dispersant added amount / inorganic compound added = 1). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, a preform was obtained from this pellet by injection molding, and then stretch blow molding was performed to obtain a bottle of Example 4 having an average body thickness of 0.45 mm and a capacity of 500 ml.

Example 5 PET was used as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as an inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as a dispersant. At this time, the added amount of zinc oxide was set to 2.0 parts by weight with respect to 100 parts by weight of PET, and the dispersant was set to 2.0 parts by weight (R = added amount of dispersant / added amount of inorganic compound = 1). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, using a dry pellet of this resin composition as an intermediate layer, a multilayer preform of natural PET / resin composition / natural PET is obtained by injection molding, and then stretch blow molding is performed to obtain natural PET (wall thickness 200 μm) /
Body thickness of resin composition (thickness 350 μm) / natural PET (thickness 200 μm) 0.65 mm, capacity 50
0 ml of the multilayer bottle of Example 5 was obtained. Here, natural PET is PET that does not contain additives such as inorganic compounds and dispersants.

Comparative Example 1 A container of Comparative Example 1 was obtained in the same manner as in Example 1 except that the dispersant was not added.

Comparative Example 2 PET was used as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm was used as an inorganic compound having an ultraviolet absorbing ability, and a low molecular weight polyolefin wax was used as a dispersant. At this time, the added amount of zinc oxide was set to 5.0 parts by weight with respect to 100 parts by weight of PET, and the dispersant was set to 5.0 parts by weight (R = dispersant added amount / inorganic compound added = 1). Using a twin-screw extruder, a mixture of this inorganic compound and a dispersant is added to and kneaded with molten PET, and the extruded molten resin is water-cooled and pelletized to form PET, zinc oxide, and a low molecular weight polyolefin wax. Dry pellets of the resin composition were obtained. Next, by using the dried pellets of this resin composition, a container of Comparative Example 2 having an average body thickness of 0.8 mm and a capacity of 150 ml was obtained by injection molding.

<Comparative Example 3> A multilayer bottle of Comparative Example 3 was obtained in the same manner as in Example 5, except that the dispersant was not added.

Regarding the barrel portions of the containers and bottles obtained in Examples 1 to 5 and Comparative Examples 1 to 3, the light transmittance was evaluated by a spectrophotometer and the transparency was evaluated by a haze meter.
The results are shown in Table 1.

[0041]

[Table 1]

From these results, the following can be said. The polyester resin container of the present invention is a polyester resin container made of a resin composition obtained by blending a thermoplastic polyester resin with an inorganic compound having an ultraviolet absorbing ability and a dispersant, or at least one layer made of the resin composition. It is a provided multi-layer polyester resin container. At this time, the amount of the inorganic compound contained in the thermoplastic polyester resin,
0.01 to 100 parts by weight of thermoplastic polyester resin
To 3.00 parts by weight, and if necessary, the ratio R of the added amount of the inorganic compound and the added amount of the dispersant (R = the added amount of the dispersant / the added amount of the inorganic compound) is set to 0.1 ≦ R ≦ 5. Thus, it is possible to obtain a polyester resin container having an ultraviolet absorbing ability and maintaining high transparency. In Examples 1 to 5,
Thermoplastic polyester resin 100 is prepared by blending PET, which is a thermoplastic polyester resin, with zinc oxide as an inorganic compound and a low-molecular-weight polyolefin wax as a dispersant.
0.01 to 3 parts by weight of the inorganic compound, and the dispersant addition amount / inorganic compound addition ratio R is 0.1 ≦ R with respect to parts by weight.
It can be seen that a container excellent in ultraviolet absorbing ability and transparency can be obtained by setting in the range of ≤5. Further, from Comparative Examples 1 and 3, it can be seen that, if the dispersant is not added, the dispersibility of zinc oxide, which is an inorganic compound, decreases, and thus the transparency decreases. From Comparative Example 2, it can be seen that when the amount of zinc oxide added is large, the transparency is significantly reduced although it has an ultraviolet absorbing ability.

[0043]

The present invention is constructed as described above, and has the following excellent practical effects. That is, the polyester resin container of the present invention is a container having an ultraviolet absorbing ability, that is, an ultraviolet blocking property, and is a container in which the original transparency of the resin is maintained. Furthermore, the container is also very excellent in that it has excellent durability of ultraviolet absorption, safety, hygiene, heat resistance and the like, and there is no problem such as coloring.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E033 BA17 BA18 BB04 BB08 CA20                       FA02 FA03                 4F100 AA17A AA17H AA21A AA21H                       AA23A AA23H AA25A AA25H                       AH02A AH02H AK42A CA07A                       DE01A GB16 JB16A JN02                       JN08 YY00A                 4F208 AA24 AB06 AB14 AB16 AR12                       LA01 LA04 LB01 LB22

Claims (8)

[Claims] 1. A thermoplastic polyester resin containing an inorganic compound having an ultraviolet absorbing ability in a thermoplastic polyester resin.
A polyester resin having a single-layer or multi-layer transparency, which is provided with at least one layer made of a resin composition containing 0.01 to 3.00 parts by weight with respect to 00 parts by weight, and a dispersant. container. 2. The ratio R (R = dispersant added amount / inorganic compound added amount) of the added amount of the inorganic compound and the added amount of the dispersant according to claim 1, wherein 0.1 ≦ R ≦ 5. Polyester resin container. 3. A polyester resin container according to claim 1, which contains at least one of zinc oxide, titanium oxide, cerium oxide, and iron oxide as an inorganic compound having an ultraviolet absorbing ability. 4. The dispersant according to claim 1, 2 or 3, containing at least one kind of a higher fatty acid or a metal salt thereof, an ester, an amide, or a low molecular weight polyolefin wax or an acid-modified product or a copolymer thereof. A polyester resin container characterized in that 5. The polyester resin according to claim 1, 2, 3 or 4, wherein the inorganic compound having an ultraviolet absorbing ability mixed with the thermoplastic polyester resin is fine particles having an average primary particle diameter of 10 to 100 nm. container. 6. A container made of a resin composition obtained by blending the thermoplastic polyester resin according to claim 1, an inorganic compound having an ultraviolet absorbing ability and a dispersant with a thickness of 2 mm. In some cases, the polyester resin container has a light transmittance of 75% or more at a wavelength of 700 nm and a light transmittance of 20% or less at a wavelength of 360 nm. 7. The thickness of a container made of a resin composition obtained by blending the thermoplastic polyester resin according to claim 1, 2, 3, 4, 5 or 6 with an inorganic compound having an ultraviolet absorbing ability and a dispersant. A polyester resin container having a haze value of 50% or less when it is 2 mm. 8. The polyester resin container according to claim 1, 2, 3, 4, 5, 6 or 7, which is obtained by injection molding, blow molding, or injection molding and stretch blow molding. Polyester resin container.