JP5290702B2 - Polyester composition and bottle - Google Patents

Polyester composition and bottle Download PDF

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JP5290702B2
JP5290702B2 JP2008276793A JP2008276793A JP5290702B2 JP 5290702 B2 JP5290702 B2 JP 5290702B2 JP 2008276793 A JP2008276793 A JP 2008276793A JP 2008276793 A JP2008276793 A JP 2008276793A JP 5290702 B2 JP5290702 B2 JP 5290702B2
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spherical silica
polyester composition
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polyester
bottle
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JP2010106064A (en
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安彦 友成
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Teijin Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polyester composition having sufficient strength even in thin-wall forming, wherein a drinking bottle formed into a thinner wall shape than that obtained by conventional arts can be provided; the amount of resin to be used can be reduced; and the load to cost reduction and environment can be reduced. <P>SOLUTION: The polyester composition includes an aromatic polyester and spherical silica. The spherical silica includes two types of spherical silica, spherical silica A having an average particle size of 10-40 nm and spherical silica B having an average particle size of 50-150 nm. The total weight of the spherical silica is 0.01-0.3 wt.% of the total weight of the polyester composition. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、ポリエステル組成物及びそれからなる成形品に関する。更に詳細には、薄肉成形しても引張り強度の優れているポリエステル組成物、その製造方法及びその組成物からなるボトルに関する。   The present invention relates to a polyester composition and a molded article comprising the same. More specifically, the present invention relates to a polyester composition having excellent tensile strength even when thin-walled, a method for producing the same, and a bottle comprising the composition.

ポリエステルは、機械的強度、耐熱性、透明性及びガスバリア性に優れており、ジュース、清涼飲料、炭酸飲料などの飲料充填容器のボトル素材をはじめとしてフィルム、シート、繊維などの素材として好適に使用されている。   Polyester has excellent mechanical strength, heat resistance, transparency, and gas barrier properties, and is suitable for use as a material for films, sheets, fibers, etc., as well as bottle materials for beverage filling containers such as juices, soft drinks, and carbonated drinks. Has been.

近年、成形メーカーや飲料メーカーがペットボトルのコストダウンに注力した研究開発を進めている(例えば、特許文献1参照。)。特に注目すべきは、従来のポリエステル樹脂使用量よりも約30重量%削減した薄肉のペットボトルである。しかしながら、ボトルを軽量化することで、ボトル胴部の肉厚は減少し、ボトル強度が大幅に減少するといった重欠点が生じることがある。
特開2003−119257号公報
In recent years, molding manufacturers and beverage manufacturers have been conducting research and development focused on reducing the cost of PET bottles (see, for example, Patent Document 1). Of particular note are thin-walled PET bottles that are reduced by about 30% by weight from the amount of conventional polyester resin used. However, by reducing the weight of the bottle, the thickness of the bottle body may be reduced, resulting in a serious drawback that the bottle strength is greatly reduced.
JP 2003-119257 A

本発明の課題は、添加剤を添加し薄肉成形しても曇り度合いが少なく且つ引張り強度の優れているポリエステル組成物及びその製造方法並びにそのポリエステル組成物を溶融成形してなるボトルを提供することにある。   An object of the present invention is to provide a polyester composition having a low haze and excellent tensile strength even when thin-walled by adding an additive, a method for producing the same, and a bottle formed by melt-molding the polyester composition. It is in.

本発明者は、上記課題を解決するためにポリエステル樹脂強度アップに用いられる粒子について鋭意研究したところ、平均粒子径の異なる大小の球状シリカを組み合わせて添加することによって、曇り度合いが少なくかつ引張り強度の優れたポリエステル樹脂を製造できることを見出して本発明を解決するに至った。   In order to solve the above-mentioned problems, the present inventor has intensively studied about the particles used for increasing the strength of the polyester resin. By adding a combination of large and small spherical silicas having different average particle diameters, the present inventors have less haze and tensile strength. The present invention has been solved by finding that an excellent polyester resin can be produced.

即ち本発明の課題は芳香族ポリエステルと球状シリカからなるポリエステル組成物であって、前記球状シリカが平均粒径10〜40nmの球状シリカAと平均粒径50〜150nmの球状シリカBの2種類の球状シリカからなり、前記ポリエステル組成物の全体の重量を基準として前記球状シリカの全重量の合計が0.01〜0.3重量%含まれており、前記球状シリカAと前記球状シリカBの前記ポリエステル組成物の全体の重量を基準とする含有比率が2:1であるポリエステル組成物によって解決することができる。 That object of the present invention is a polyester composition comprising an aromatic polyester and the spherical silica, the spherical silica average particle diameter 10~40nm an average particle size of 50~150nm and spherical silica A spherical silica B 2 kinds of consists spherical silica, the included total 0.01 to 0.3 wt% of the total weight of the spherical silica, based on the total weight of the polyester composition, wherein said spherical silica B and the spherical silica a This can be solved by a polyester composition having a content ratio of 2: 1 based on the total weight of the polyester composition.

本発明によれば、薄肉成形を行っても十分な強度を有するポリエステル組成物が得られるため、従来技術より薄肉成形した飲料用ボトルを提供することができ、使用する樹脂量も減らすことができるため、コストダウンや環境への負荷が低減されることになる。   According to the present invention, since a polyester composition having sufficient strength can be obtained even if thin-wall molding is performed, it is possible to provide a beverage bottle that is thinner-walled than the prior art, and the amount of resin to be used can also be reduced. Therefore, cost reduction and environmental load are reduced.

以下、本発明を詳細に説明する。
本発明に使用する芳香族ポリエステルとは、芳香族ジカルボン酸又はそのエステル成形性誘導体と脂肪族ジオールを重縮合反応させて得られる芳香族ポリエステルである。芳香族ジカルボン酸のエステル成形性誘導体とは炭素数1〜6個の低級ジアルキルエステル、炭素数6〜8個の低級ジアリールエステル、ジ酸ハライドを指す。芳香族ジカルボン酸としては具体的には、テレフタル酸、イソフタル酸、2,6−ナフタレンジカルボン酸、2,7−ナフタレンジカルボン酸、4,4’−ジフェニルジカルボン酸、4,4’−ジフェニルメタンジカルボン酸、ジフェニルケトンジカルボン酸、4,4’−ジフェニルスルホンジカルボン酸を表す。脂肪族ジオールとしては具体的には、エチレングリコール、1,2−プロピレングリコール、トリメチレングリコール、テトラメチレングリコール、ヘプタメチレングリコール、ヘキサメチレングリコール、ジエチレングリコール、ジプロピレングリコール、ビス(トリメチレングリコール)、ビス(テトラメチレングリコール)、トリエチレングリコール、1,4−ジヒドロキシシクロヘキサン、1,4−シクロヘキサンジメタノールを表す。中でも芳香族ポリエステルを構成する全繰り返し単位あたり80モル%以上が、テレフタル酸等又はナフタレンジカルボン酸等とエチレングリコールを重縮合反応させて得られたエチレンテレフタレート単位又はエチレンナフタレート単位であることを好ましい。より好ましくは90モル%以上である事である。この中でも本発明の実施に好適なジオールはエチレングリコールがあり、好適なカルボン酸エステルはテレフタル酸ジメチルがある。さらに、本発明の実施に好ましいポリエステルはポリエチレンテレフタレート(PET)又はポリエチレンナフタレート(PEN)である。
Hereinafter, the present invention will be described in detail.
The aromatic polyester used in the present invention is an aromatic polyester obtained by a polycondensation reaction between an aromatic dicarboxylic acid or an ester moldable derivative thereof and an aliphatic diol. An ester moldable derivative of an aromatic dicarboxylic acid refers to a lower dialkyl ester having 1 to 6 carbon atoms, a lower diaryl ester having 6 to 8 carbon atoms, and a diacid halide. Specific examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, and 4,4′-diphenylmethanedicarboxylic acid. , Diphenyl ketone dicarboxylic acid, 4,4′-diphenyl sulfone dicarboxylic acid. Specific examples of the aliphatic diol include ethylene glycol, 1,2-propylene glycol, trimethylene glycol, tetramethylene glycol, heptamethylene glycol, hexamethylene glycol, diethylene glycol, dipropylene glycol, bis (trimethylene glycol), bis (Tetramethylene glycol), triethylene glycol, 1,4-dihydroxycyclohexane, 1,4-cyclohexanedimethanol. Among them, it is preferable that 80 mol% or more per all repeating units constituting the aromatic polyester is an ethylene terephthalate unit or an ethylene naphthalate unit obtained by polycondensation reaction of terephthalic acid or the like or naphthalene dicarboxylic acid or the like with ethylene glycol. . More preferably, it is 90 mol% or more. Among these, the preferred diol for carrying out the present invention is ethylene glycol, and the preferred carboxylic acid ester is dimethyl terephthalate. Further preferred polyesters for the practice of this invention are polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

本発明のポリエステル組成物を構成するのに好適な鉱物粒子は、球状シリカであり、平均粒径が10〜40nmの球状シリカAと平均粒径が50〜150nmの球状シリカBの2種類の球状シリカを用いる必要がある。より好ましくはその球状シリカとして、平均粒径が20〜30nmの球状シリカAと平均粒径が55〜130nmの球状シリカBを用いることである。好都合な粒子状鉱物は好ましくは二酸化ケイ素、アルミナ、二酸化チタンなどの金属酸化物である。これらは表面処理を施していることが好ましい。この表面処理は、粒子のグリコール成分及びポリエステル重合体中への分散性向上を目的とすることが好適に実施される。平均粒子径がこの範囲よりも小さいと発明の課題である強度が向上するといった効果が見られず、平均粒子径がこの範囲を超える場合には、溶融成形したばあいに成形品に曇りが生じることがあり好ましくない。   The mineral particles suitable for constituting the polyester composition of the present invention are spherical silica, and two types of spherical particles, spherical silica A having an average particle diameter of 10 to 40 nm and spherical silica B having an average particle diameter of 50 to 150 nm. It is necessary to use silica. More preferably, spherical silica A having an average particle diameter of 20 to 30 nm and spherical silica B having an average particle diameter of 55 to 130 nm are used as the spherical silica. Convenient particulate minerals are preferably metal oxides such as silicon dioxide, alumina, titanium dioxide. These are preferably surface-treated. This surface treatment is preferably carried out for the purpose of improving the dispersibility of the particles in the glycol component and the polyester polymer. If the average particle size is smaller than this range, the effect of improving the strength, which is the subject of the invention, is not seen. If the average particle size exceeds this range, the molded product becomes cloudy when melt-molded. This is not preferable.

シリカは本発明の実施に好適な粒子である。主にシリカゾルは粒子の良好な分散性を有する組成物を得るためには特に好適であり、本発明の目的に適合する。ポリエステル組成物中の球状シリカ粒子の重量濃度は、球状シリカの合計としてポリエステル組成物の全体の重量を基準として、0.01〜0.3重量%、好ましくは0.05〜0.2重量%である。ポリエステル組成物中の当該濃度範囲がこの範囲よりも少ないと発明の課題である強度が向上するといった効果が見られず、濃度範囲がこの範囲を超える場合には、溶融成形したばあいに成形品に曇りが生じることがあり好ましくない。   Silica is a suitable particle for the practice of the present invention. Mainly silica sol is particularly suitable for obtaining a composition having good dispersibility of the particles and is suitable for the purpose of the present invention. The weight concentration of the spherical silica particles in the polyester composition is 0.01 to 0.3% by weight, preferably 0.05 to 0.2% by weight, based on the total weight of the polyester composition as the sum of the spherical silica. It is. If the concentration range in the polyester composition is less than this range, the effect of improving the strength, which is the subject of the invention, is not seen, and if the concentration range exceeds this range, the molded product should be melt molded. It is not preferable because cloudiness may occur.

球状シリカ粒子は鉱物充填剤を重合体中に導入する公知の方法に従い、重合体中に導入することができる。第1の方法は、重合の開始に先立ちポリエステルの合成媒体中に粒子を導入することである。次に重合は球状シリカ粒子の存在下で実施される。球状シリカ粒子は粉体又は液体媒体中に分散した形態で導入できる。第2の方法は、球状シリカ粒子を溶融した重合体中に粉体で導入し、剪断力を加え混合することにより、均一な分散体を得ることである。本操作は、1軸あるいは2軸のスクリューを有する混練り機により実施できる。第3の方法は、球状シリカ粒子をいわゆるマスターバッチ法による方法(親練り混合物の形)で溶融重合体に導入できることである。親練り混合物は従来法により調製できる。親練り混合物の溶融重合体への導入は2軸のスクリューを有する混合装置により実施できる。マスターバッチ法は当該シリカ粒子をポリエステル組成物の全体の重量を基準として1〜30重量%含むポリエステル組成物を予め作成しておき、少なくとも一種のジオールと、少なくとも一種の芳香族ジカルボン酸又は芳香族ジカルボン酸エステルとの混合物をエステル化反応又はエステル交換反応を行わせ、ついで得られたエステル化反応生成物又はエステル交換反応生成物を減圧下で重縮合させる工程を含むポリエステル組成物の製造方法において、重縮合工程以降の工程で添加することにより製造することができる。反応槽内における重縮合工程、又はその後1軸若しくは2軸押し出し機(混練機)による混合(混練)工程において添加・溶融混合することが好ましく採用することができる。   The spherical silica particles can be introduced into the polymer according to a known method for introducing a mineral filler into the polymer. The first method is to introduce the particles into the polyester synthesis medium prior to initiation of polymerization. The polymerization is then carried out in the presence of spherical silica particles. The spherical silica particles can be introduced in a form dispersed in a powder or liquid medium. A second method is to obtain a uniform dispersion by introducing spherical silica particles into a molten polymer as a powder, and applying a shearing force and mixing. This operation can be carried out by a kneader having a single screw or a twin screw. The third method is that spherical silica particles can be introduced into the molten polymer by a so-called masterbatch method (in the form of a kneaded mixture). Intimate mixtures can be prepared by conventional methods. The intimate mixture can be introduced into the molten polymer by a mixing device having a twin screw. In the masterbatch method, a polyester composition containing 1 to 30% by weight of the silica particles based on the total weight of the polyester composition is prepared in advance, and at least one diol and at least one aromatic dicarboxylic acid or aromatic are prepared. In a method for producing a polyester composition comprising a step of subjecting a mixture with a dicarboxylic acid ester to esterification or transesterification, and then polycondensing the obtained esterification reaction product or transesterification reaction product under reduced pressure. It can manufacture by adding in the process after a polycondensation process. Addition and melt mixing can be preferably employed in the polycondensation step in the reaction tank, or in the subsequent mixing (kneading) step using a single or twin screw extruder (kneader).

本発明の有利な実施の形態によると、球状シリカ粒子はポリエステルの合成媒体中にゾルの形態で導入される。ゾルは水性ゾル又はグリコールゾルがあるが、グリコールゾルの方が特に本発明の実施に適している。より好ましい製造方法の態様は少なくとも一種のジオールと、少なくとも一種の芳香族ジカルボン酸又は芳香族ジカルボン酸エステルとの混合物中に、平均粒径が20〜400nmの球状シリカを含むシリカゾルを導入し、エステル化反応又はエステル交換反応を行わせ、ついで得られたエステル化反応生成物又はエステル交換反応生成物を減圧下で重縮合させ、ポリエステル組成物を得る方法である。   According to an advantageous embodiment of the invention, the spherical silica particles are introduced into the polyester synthesis medium in the form of a sol. The sol may be an aqueous sol or a glycol sol, and the glycol sol is particularly suitable for the practice of the present invention. A more preferred embodiment is a method in which a silica sol containing spherical silica having an average particle size of 20 to 400 nm is introduced into a mixture of at least one diol and at least one aromatic dicarboxylic acid or aromatic dicarboxylic acid ester, In this method, a polyester composition is obtained by carrying out an esterification reaction or a transesterification reaction and then polycondensing the resulting esterification reaction product or transesterification reaction product under reduced pressure.

この形態に従った組成物の調製方法は次の通りである。
少なくとも一種のジオールと芳香族ジカルボン酸又は芳香族ジカルボン酸エステルとの混合物中に、平均粒径20〜400nm以下のシリカゾルを導入し、芳香族ジカルボン酸又は芳香族ジカルボン酸エステルのジオールによるエステル化又はエステル交換反応を行わせ、エステル化生成物又はエステル交換反応生成物を減圧下に重縮合させる。このポリエステル組成物の製造方法は、シリカゾルを導入する点を除けば従来法と同じである。エステル化反応工程又はエステル交換反応工程はポリエステルの製造方法の工業的手法で広く実施されている工程である。これら2つの方法は例えばポリエチレンテレフタレート製造のために使用されている。以下主にポリエチレンテレフタレートを製造する場合について述べる。
The method for preparing the composition according to this embodiment is as follows.
A silica sol having an average particle size of 20 to 400 nm or less is introduced into a mixture of at least one diol and aromatic dicarboxylic acid or aromatic dicarboxylic acid ester, and esterification of aromatic dicarboxylic acid or aromatic dicarboxylic acid ester with diol or An ester exchange reaction is performed, and the esterification product or the ester exchange reaction product is polycondensed under reduced pressure. The production method of this polyester composition is the same as the conventional method except that silica sol is introduced. The esterification reaction step or the transesterification reaction step is a step that is widely practiced by an industrial method of a polyester production method. These two methods are used, for example, for the production of polyethylene terephthalate. Hereinafter, the case of producing polyethylene terephthalate will be mainly described.

第一の調製方法はメチルテレフタレート(DMT)法、すなわちエステル交換法である。溶融したDMTを過剰のエチレングリコール(EG)にEG/DMT=1.9〜2.2のモル比で溶解し、エステル交換反応を常圧下、温度130〜250℃で実施する。エステル交換反応には酢酸マンガン等の触媒が必要となる。エステル交換反応により生成するメタノールは蒸留により除去される。未反応のエチレングリコールはエステル交換反応後に蒸発により除去される。このエステル交換反応により得られる生成物はビス−β−ヒドロキシエチルテレフタレート(BHET)である。   The first preparation method is a methyl terephthalate (DMT) method, that is, a transesterification method. The molten DMT is dissolved in excess ethylene glycol (EG) at a molar ratio of EG / DMT = 1.9 to 2.2, and the transesterification reaction is carried out at a temperature of 130 to 250 ° C. under normal pressure. A catalyst such as manganese acetate is required for the transesterification reaction. Methanol produced by the transesterification reaction is removed by distillation. Unreacted ethylene glycol is removed by evaporation after the transesterification reaction. The product obtained by this transesterification is bis-β-hydroxyethyl terephthalate (BHET).

第二の調製方法は直接エステル化法であり、テレフタル酸のエチレングリコールによるエステル化反応を行う。このエステル化反応は、EG/テレフタル酸=1〜1.5のモル比で温度190〜280℃、好ましくは200〜260℃で実施する。このエステル化反応はテレフタル酸自身が触媒として寄与し得るので、更なる触媒化合物の添加はなくても良い。必要に応じて適切なエステル化触媒化合物を添加することができる。このエステル交換反応により得られる生成物はビス−β−ヒドロキシエチルテレフタレート(BHET)又は更に反応が進行したエチレンテレフタレートのオリゴマーである。   The second preparation method is a direct esterification method, in which an esterification reaction of terephthalic acid with ethylene glycol is performed. This esterification reaction is carried out at a temperature of 190 to 280 ° C., preferably 200 to 260 ° C., in a molar ratio of EG / terephthalic acid = 1 to 1.5. In this esterification reaction, since terephthalic acid itself can contribute as a catalyst, no further catalyst compound need be added. An appropriate esterification catalyst compound can be added as needed. The product obtained by this transesterification is bis-β-hydroxyethyl terephthalate (BHET) or an oligomer of ethylene terephthalate that has undergone further reaction.

次に重縮合の工程を行うのであるが、重縮合の工程は一般に二酸化ゲルマニウム、ゲルマニウムテトラエトキシド、ゲルマニウムテトラ−n−ブトキシドなどのゲルマニウム触媒化合物、三酸化アンチモンなどのアンチモン触媒化合物又はチタニウムテトラブトキシドなどのチタン触媒化合物を用いることができる。   Next, a polycondensation step is performed. Generally, the polycondensation step is performed by using a germanium catalyst compound such as germanium dioxide, germanium tetraethoxide, germanium tetra-n-butoxide, an antimony catalyst compound such as antimony trioxide, or titanium tetrabutoxide. A titanium catalyst compound such as can be used.

本発明のポリエステル組成物はボトルの成形に利用できる。熱可塑性の重合体からボトルを製造する一般的な方法は本発明のポリエステル組成物を成形するために好適に採用できる。特に射出成形を行い、ついでブロー成形を行う方法が一般に好ましい。本発明のポリエステル組成物を用いて成形すれば、得られたボトルは容易にヘイズが1.0%以下になるようにすることができる。当該ボトルは飲料用のボトルとして好適に用いることができる。   The polyester composition of the present invention can be used for forming a bottle. A general method for producing a bottle from a thermoplastic polymer can be suitably employed for molding the polyester composition of the present invention. In particular, a method of performing injection molding and then blow molding is generally preferred. If it shape | molds using the polyester composition of this invention, the obtained bottle can make it haze 1.0% or less easily. The bottle can be suitably used as a beverage bottle.

以下に実施例を挙げて更に本発明を具体的に説明するが、本発明は当該実施例に限定されるものではない。   EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples.

[実施例1]
1.ポリエステル組成物の製造
[マスターチップの製造]
テレフタル酸ジメチルエステル20000g(103.2mol)とエチレングリコール12800g(206.2mol)との混合物に、テレフタル酸ジメチルエステルに対し、トリメリット酸チタンをチタン原子として5.0mmol%を撹拌機、精留塔及びメタノール溜出コンデンサーを設けた加圧反応が可能なステンレス製容器に仕込み、0.08MPaの加圧を行い、140℃から徐々に昇温しつつ、反応の結果生成するメタノールを系外に溜出させながら、エステル交換反応を行った。メタノールの溜出が完了し内温が235℃に達した時点で、得られるポリエステル組成物に対して2.0重量%となるように平均粒径25nmの球状シリカ粒子の10重量%グリコールゾル(触媒化成株式会社より購入、商品名:オスカル特殊品)と、得られるポリエステル組成物(マスターチップ)に対して1.0重量%となるように平均粒径60nmの球状シリカ粒子の10重量%グリコールゾル(触媒化成株式会社より購入、商品名:オスカル特殊品)を添加した。次いで、内温が248℃になった時点で、酢酸ナトリウムをテレフタル酸ジメチルエステルに対し、ナトリウム原子として5.0mmol%、二酸化ゲルマニウムをテレフタル酸ジメチルエステルに対し、二酸化ゲルマニウムをテレフタル酸ジメチルエステルに対し、二酸化ゲルマニウム分子として35mmol%及び正リン酸をテレフタル酸ジメチルエステルに対し、リン原子として30.0mmol%を添加し、5分間撹拌を行った後反応を終了した。
[Example 1]
1. Manufacture of polyester composition [Manufacture of master chip]
In a mixture of 20,000 g (103.2 mol) of dimethyl terephthalate and 12800 g (206.2 mol) of ethylene glycol, 5.0 mmol% of titanium trimellitic acid as a titanium atom with respect to dimethyl terephthalate, a stirrer, a rectifying tower And a methanol container that is equipped with a methanol condenser and capable of pressure reaction, pressurizes to 0.08 MPa, gradually raises the temperature from 140 ° C., and accumulates methanol generated as a result of the reaction outside the system. The transesterification reaction was carried out while allowing When the distillation of methanol is completed and the internal temperature reaches 235 ° C., 10 wt% glycol sol of spherical silica particles having an average particle diameter of 25 nm so as to be 2.0 wt% with respect to the obtained polyester composition ( 10% by weight of spherical silica particles having an average particle diameter of 60 nm so as to be 1.0% by weight with respect to the obtained polyester composition (master chip), purchased from Catalytic Chemical Co., Ltd. Sol (purchased from Catalytic Chemical Co., Ltd., trade name: Oscar special product) was added. Next, when the internal temperature reached 248 ° C., sodium acetate was added to dimethyl terephthalate by 5.0 mmol% as a sodium atom, germanium dioxide was added to dimethyl terephthalate, and germanium dioxide was added to dimethyl terephthalate. Then, 35 mmol% as germanium dioxide molecules and 30.0 mmol% as phosphorous atoms with respect to dimethyl terephthalic acid as a positive phosphoric acid were added, and the reaction was terminated after stirring for 5 minutes.

次いで、得られた反応生成物を撹拌装置、窒素導入口、減圧口及び蒸留装置を備えた反応容器に移し、210℃から280℃に徐々に昇温すると共に、常圧から50Paの高真空に圧力を下げながら重縮合反応を行った。反応系の溶融粘度をトレースしつつ、固有粘度が0.52dL/gとなる時点で重縮合反応を打ち切った。溶融ポリマーを反応器底部よりストランド状に冷却水中に押し出し、ストランドカッターを用いて切断してペレット化した。
なお、シリカ粒子の平均粒径はその製品のメーカーによって測定され、当該製品を納入時に添付された試験成績証明書に表示された値によって判断した。
Subsequently, the obtained reaction product is transferred to a reaction vessel equipped with a stirrer, a nitrogen inlet, a vacuum port and a distillation device, and gradually heated from 210 ° C. to 280 ° C., and from a normal pressure to a high vacuum of 50 Pa. The polycondensation reaction was carried out while reducing the pressure. While tracing the melt viscosity of the reaction system, the polycondensation reaction was terminated when the intrinsic viscosity reached 0.52 dL / g. The molten polymer was extruded in the form of a strand from the bottom of the reactor into cooling water, and was cut into pellets using a strand cutter.
The average particle size of the silica particles was measured by the manufacturer of the product, and the product was judged by the value displayed on the test certificate attached at the time of delivery.

[固相重合工程]
本実施例では、このようにして得られたポリエチレンテレフタレート組成物を加熱予備結晶化後、固相重合を行った。すなわち得られたペレットは、150℃で5時間予備加熱結晶化後、静置式の固相重合装置に仕込み、窒素気流下215℃で約22時間固相重合反応せしめて、固有粘度0.770dL/gのポリエチレンテレフタレート組成物ペレットを得た。
[Solid-state polymerization process]
In this example, the polyethylene terephthalate composition thus obtained was subjected to solid-state polymerization after heating and precrystallization. That is, the pellets obtained were preheated and crystallized at 150 ° C. for 5 hours, and then charged into a stationary solid-phase polymerization apparatus, and subjected to a solid-state polymerization reaction at 215 ° C. for about 22 hours under a nitrogen stream, and an intrinsic viscosity of 0.770 dL / g of polyethylene terephthalate composition pellets were obtained.

[マスターチップの添加・ポリエステル組成物の製造]
上記の製造方法により製造した固相重合後のペレットを帝人製ポリエステル(ポリエチレンテレフタレート)の重量に対して2種の球状シリカ粒子が表2に示す濃度(0.1重量%、0.05重量%)になるようブレンドしてポリエステル組成物を得た。
[Addition of master chip and production of polyester composition]
Concentrations (0.1% by weight, 0.05% by weight) of the two types of spherical silica particles in the pellets after solid phase polymerization produced by the above production method are shown in Table 2 with respect to the weight of Teijin polyester (polyethylene terephthalate) ) To obtain a polyester composition.

2.評価方法
[薄肉ボトル成形]
上記ポリエステル樹脂を160℃で5時間以上乾燥した後、射出成形機(NISSEI ASB製)にてプリフォームを射出成形した。引続いて、プリフォームの表面温度約110℃に赤外線ヒーターで予熱し、ブロー圧力5〜40kg/cm、金型温度150℃に設定したブロー成形機にて延伸ブロー成形し薄肉ボトルを成形した。
2. Evaluation method [Thin bottle molding]
After the polyester resin was dried at 160 ° C. for 5 hours or longer, a preform was injection molded by an injection molding machine (manufactured by NISSEI ASB). Subsequently, the preform surface temperature was preheated to about 110 ° C. with an infrared heater, and stretch blow molding was performed with a blow molding machine set at a blow pressure of 5-40 kg / cm 2 and a mold temperature of 150 ° C. to form a thin bottle. .

[固有粘度(η)]
ボトル胴部を切り取ったポリエチレンテレフタレート樹脂0.6gをo−クロロフェノール50cc中に加熱溶解した後、一旦冷却させ、その溶液をウベローデ式粘度計を用いて35℃の温度条件で測定した溶液粘度から算出した。
[Intrinsic viscosity (η)]
After 0.6 g of polyethylene terephthalate resin from which the bottle body was cut was dissolved in 50 cc of o-chlorophenol by heating, the solution was once cooled, and the solution was measured from the solution viscosity measured at 35 ° C. using an Ubbelohde viscometer. Calculated.

[透明性]
上記成形品をNIPPON DENSHOKU製ヘイズメーターNDH2000を用い確認した。曇り度合い(ヘイズ)が1.0%以下を合格とし、その値を超えるものを不合格と評価した。
[transparency]
The molded product was confirmed using a haze meter NDH2000 manufactured by NIPPON DENSHOKU. A haze degree of 1.0% or less was regarded as acceptable, and those exceeding the value were evaluated as unacceptable.

[結晶化度]
密度勾配管にてボトル胴部の結晶化度を測定した。
[Crystallinity]
The crystallinity of the bottle body was measured with a density gradient tube.

[引張り強度]
上記成形品の胴部より2号形の試験片を作成し、島津製作所製AG−100Bオートグラフを用い引張り強度を評価した。
[Tensile strength]
A No. 2 test piece was created from the body of the molded product, and the tensile strength was evaluated using an AG-100B autograph manufactured by Shimadzu Corporation.

[実施例2]
実施例1に準じ、表1に示すように、1種の球状シリカ粒子を平均粒径が120nmのもの変更する以外は実施例1と同様の操作にて、ポリエステル組成物、薄肉ボトルを成形した。薄肉ボトル成形後のボトル胴部の溶融粘度、ヘイズ、結晶化度、引張り強度を評価した結果を表1に示した。
[Example 2]
According to Example 1, as shown in Table 1, a polyester composition and a thin bottle were formed in the same manner as in Example 1 except that one type of spherical silica particles was changed with an average particle size of 120 nm. . Table 1 shows the results of evaluating the melt viscosity, haze, crystallinity, and tensile strength of the bottle body after molding the thin bottle.

[比較例1]
球状シリカ粒子を添加しない以外は、ポリエステル組成物、ボトルの成形操作・それらの評価方法は実施例1と同じ操作を行い、ポリエステル組成物、ボトルを得た。結果を表1に示した。
[Comparative Example 1]
Except for not adding the spherical silica particles, the polyester composition and the bottle forming operation / the evaluation method thereof were the same as those in Example 1 to obtain a polyester composition and a bottle. The results are shown in Table 1.

[比較例2〜4]
平均粒径が25nm、60nm、120nmの球状シリカ粒子の単一種類をそれぞれポリエチレンテレフタレートに加える操作を行う以外は実施例1と同じ操作を行い、ポリエステル組成物、ボトルを得た。実施例1と同様の評価方法を実施し、結果を表1に示した。
[Comparative Examples 2 to 4]
A polyester composition and a bottle were obtained in the same manner as in Example 1 except that a single type of spherical silica particles having an average particle size of 25 nm, 60 nm, and 120 nm was added to polyethylene terephthalate. The same evaluation method as in Example 1 was carried out, and the results are shown in Table 1.

Figure 0005290702
Figure 0005290702

本発明によれば、薄肉成形を行っても十分な強度を有するポリエステル組成物が得られるため、従来技術より薄肉成形した飲料用ボトルを提供することができる。更に、使用する樹脂量も減らすことができるため、コストダウンや環境への負荷が低減されることになり、産業上の意義が極めて大きい。   According to the present invention, since a polyester composition having sufficient strength can be obtained even if thin-wall molding is performed, a beverage bottle that is thin-walled from the prior art can be provided. Furthermore, since the amount of resin to be used can be reduced, the cost reduction and the burden on the environment are reduced, and the industrial significance is extremely great.

Claims (8)

芳香族ポリエステルと球状シリカからなるポリエステル組成物であって、前記球状シリカが平均粒径10〜40nmの球状シリカAと平均粒径50〜150nmの球状シリカBの2種類の球状シリカからなり、前記ポリエステル組成物の全体の重量を基準として前記球状シリカの全重量の合計が0.01〜0.3重量%含まれており、前記球状シリカAと前記球状シリカBの前記ポリエステル組成物の全体の重量を基準とする含有比率が2:1であるポリエステル組成物。 A polyester composition comprising an aromatic polyester and the spherical silica, the spherical silica consists of two kinds of spherical silica spherical silica B having an average particle size of 50~150nm and spherical silica A having an average particle diameter of 10 to 40 nm, wherein the sum of the total weight of the spherical silica on the total weight, based on the polyester composition contains 0.01 to 0.3 wt%, of the total of the polyester composition of the said spherical silica a spherical silica B A polyester composition having a content ratio based on weight of 2: 1 . 前記芳香族ポリエステルがポリエチレンテレフタレートである請求項1記載のポリエステル組成物。 The polyester composition according to claim 1, wherein the aromatic polyester is polyethylene terephthalate. 前記球状シリカがポリエステル組成物の全体の重量を基準として0.05〜0.2重量%含まれている請求項1〜2のいずれか1項記載のポリエステル組成物。 The polyester composition according to claim 1, wherein the spherical silica is contained in an amount of 0.05 to 0.2% by weight based on the total weight of the polyester composition. 前記球状シリカが平均粒径20〜30nmの球状シリカAと平均粒径55〜130nmの球状シリカBの2種類の球状シリカからなる請求項1〜3のいずれか1項記載のポリエステル組成物。 The polyester composition according to any one of claims 1 to 3, wherein the spherical silica comprises two types of spherical silica, spherical silica A having an average particle diameter of 20 to 30 nm and spherical silica B having an average particle diameter of 55 to 130 nm. 少なくとも一種のジオールと、少なくとも一種の芳香族ジカルボン酸又は芳香族ジカルボン酸エステルとの混合物中に、平均粒径10〜40nmの前記球状シリカAと平均粒径50〜150nmの前記球状シリカBの2種類の球状シリカを含むシリカゾルを導入し、エステル化反応又はエステル交換反応を行わせ、ついで得られたエステル化反応生成物又はエステル交換反応生成物を減圧下で重縮合させる工程を含む請求項1〜4のいずれか1項記載のポリエステル組成物の製造方法。 And at least one diol, in a mixture of at least one aromatic dicarboxylic acid or an aromatic dicarboxylic acid ester, and the spherical silica A having an average particle diameter 10~40nm average particle size of 50~150nm of the spherical silica B 2 2. A step of introducing a silica sol containing a kind of spherical silica, causing an esterification reaction or a transesterification reaction, and then polycondensing the obtained esterification reaction product or transesterification reaction product under reduced pressure. The manufacturing method of the polyester composition of any one of -4. 少なくとも一種のジオールと、少なくとも一種の芳香族ジカルボン酸又は芳香族ジカルボン酸エステルとの混合物をエステル化反応又はエステル交換反応を行わせ、ついで得られたエステル化反応生成物又はエステル交換反応生成物を減圧下で重縮合させる工程を含むポリエステル組成物の製造方法において、平均粒径10〜40nmの前記球状シリカAと平均粒径50〜150nmの前記球状シリカBの2種類の球状シリカを前記ポリエステル組成物の全体の重量を基準として1〜30重量%含むポリエステル組成物を重縮合工程以降の工程で添加することを特徴とする請求項1〜4のいずれか1項記載のポリエステル組成物の製造方法。 A mixture of at least one diol and at least one aromatic dicarboxylic acid or aromatic dicarboxylic acid ester is subjected to esterification reaction or transesterification reaction, and then the obtained esterification reaction product or transesterification reaction product is obtained. the method of manufacturing a polyester composition comprising a step of polycondensing under reduced pressure, the polyester composition two kinds of spherical silica of the spherical silica B having an average particle size of 50~150nm and the spherical silica a having an average particle diameter 10~40nm The method for producing a polyester composition according to any one of claims 1 to 4, wherein a polyester composition containing 1 to 30% by weight based on the total weight of the product is added in a step subsequent to the polycondensation step. . 前記重縮合させる工程において、チタン触媒又はゲルマニウム触媒を用いる請求項5又は6記載のポリエステル組成物の製造方法。 The method for producing a polyester composition according to claim 5 or 6, wherein a titanium catalyst or a germanium catalyst is used in the polycondensation step. 請求項1〜4のいずれか1項記載のポリエステル組成物を、160℃で5時間以上乾燥した後、射出成形をして得られたプリフォーム成形品を更に延伸ブロー成形して得られたボトル胴部のサンプルをNIPPON DENSYOKU製ヘイズメーターNDH2000を用いて測定したヘイズが1.0%以下のボトル。
成形してなるヘイズが1.0%以下のボトル。
A bottle obtained by further subjecting the polyester composition according to any one of claims 1 to 4 to drying at 160 ° C for 5 hours or more and then subjecting the preform product obtained by injection molding to stretch blow molding. A bottle having a haze of 1.0% or less obtained by measuring a sample of the trunk using a haze meter NDH2000 manufactured by NIPPON DENSYKU .
A bottle having a molded haze of 1.0% or less.
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