JP2001179733A - Molding method and method for manufacturing molded article - Google Patents

Molding method and method for manufacturing molded article

Info

Publication number
JP2001179733A
JP2001179733A JP36643299A JP36643299A JP2001179733A JP 2001179733 A JP2001179733 A JP 2001179733A JP 36643299 A JP36643299 A JP 36643299A JP 36643299 A JP36643299 A JP 36643299A JP 2001179733 A JP2001179733 A JP 2001179733A
Authority
JP
Japan
Prior art keywords
screw
kneading
hopper
weight
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP36643299A
Other languages
Japanese (ja)
Inventor
Hodaka Yokomizo
穂高 横溝
Saneo Oda
実生 小田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Ltd
Original Assignee
Teijin Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teijin Ltd filed Critical Teijin Ltd
Priority to JP36643299A priority Critical patent/JP2001179733A/en
Publication of JP2001179733A publication Critical patent/JP2001179733A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a molded article constituted so as to rapidly advance the transesterification reaction of a blend of PEN and PET at the time of molding to transparentize the blend while suppressing the formation of acetraldehyde. SOLUTION: In a method for melting and kneading a thermoplastic polyester composition containing 99-1 weight% of polyethylene naphthalenedicarboxylate and 1-99 weight% of polyethylene terephthalate to mold the same, a screw plastication apparatus equipped with a cylinder and a screw is used to perform melting and kneading and the screw satisfies a condition represented by formula; 0(%)<(mL-pL)/total length of screw <30(%) (wherein mL is the distance from a hopper to the start point of a kneading part and pL is the distance from the hopper to the completion point of the kneading part).

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ポリエチレンナフ
タレンジカルボキシレート（以下、「ＰＥＮ」と略記す
ることがある）とポリエチレンテレフタレート（以下、
「ＰＥＴ」と略記することがある）との組成物の成形方
法および成形品の製造方法に関する。TECHNICAL FIELD The present invention relates to polyethylene naphthalenedicarboxylate (hereinafter abbreviated as "PEN") and polyethylene terephthalate (hereinafter abbreviated as "PEN").
(Sometimes abbreviated as “PET”) and a method for producing a molded article.

【０００２】[0002]

【従来の技術】熱可塑性ポリエステルは、その優れた物
性、成形性、コストパフォーマンスから、射出成形、押
出成形、ブロー成形、フィルムなどに幅広く使用されて
いる。特に、ＰＥＮおよびＰＥＴは、透明性および耐熱
性に優れるため、食品包装用用途に広く用いられてい
る。2. Description of the Related Art Thermoplastic polyesters are widely used in injection molding, extrusion molding, blow molding, films and the like because of their excellent physical properties, moldability and cost performance. In particular, PEN and PET are widely used for food packaging because of their excellent transparency and heat resistance.

【０００３】ＰＥＮは、ＰＥＴと比較して耐熱性、ガス
バリア性、耐薬品性および紫外線遮蔽性に優れる。この
ため、ＰＥＴの特性を簡易に向上する方法として、成形
時にＰＥＮをＰＥＴにブレンドする方法がとられる。[0003] PEN is superior to PET in heat resistance, gas barrier properties, chemical resistance and ultraviolet shielding properties. Therefore, as a method of easily improving the characteristics of PET, a method of blending PEN with PET at the time of molding is used.

【０００４】しかし、ＰＥＮをＰＥＴに溶融混練すると
き、両者の相溶性が低いことから、これらの混合物は白
濁してしまう。そのため、ＰＥＮをＰＥＴとにブレンド
して透明な成形品を得るためには、通常、溶融混練の温
度を高くし、長い時間をかけてエステル交換反応を進ま
せ、混合物を透明にして成形する方法がとられる。この
方法をとると、溶融混合の温度を高温にする必要があ
り、そのためにポリマーの熱分解が進み、分子量低下が
発生し、更には、熱分解によりアセトアルデヒドが発生
する。そのため、得られる成形品は食品包装用用途には
適さないものとなる。[0004] However, when PEN is melt-kneaded into PET, the mixture becomes cloudy due to the low compatibility between the two. Therefore, in order to obtain a transparent molded product by blending PEN with PET, a method in which the temperature of the melt-kneading is usually increased, the transesterification reaction is allowed to proceed over a long time, and the mixture is made transparent to mold. Is taken. According to this method, it is necessary to raise the temperature of the melt-mixing, so that the thermal decomposition of the polymer proceeds, the molecular weight is reduced, and acetaldehyde is generated by the thermal decomposition. Therefore, the obtained molded article is not suitable for food packaging applications.

【０００５】他方、反応を進ませるために、スクリュシ
リンダー内での滞留時間を長くすると、生産性が低下す
る。生産性の低下を回避する方法として、共重合ポリマ
ーを用いる方法や、特別な触媒組成を用いてエステル交
換反応を促進させる方法が開発されている。たとえば、
特開平9-157505号公報、特開平9-208678号公報では、Ｐ
ＥＮの酸成分の一部をテレフタル酸で置換えた、または
ＰＥＴの酸成分の一部をナフタレンジカルボン酸で置換
えた共重合ポリエステルを用いることで、エステル交換
反応が進み易くしている。On the other hand, if the residence time in the screw cylinder is increased for the purpose of promoting the reaction, the productivity is reduced. As a method for avoiding a decrease in productivity, a method using a copolymer or a method for promoting a transesterification reaction using a special catalyst composition has been developed. For example,
In JP-A-9-157505 and JP-A-9-208678, P
By using a copolyester in which a part of the acid component of EN is substituted with terephthalic acid or a part of the acid component of PET is substituted with naphthalenedicarboxylic acid, the transesterification reaction is facilitated.

【０００６】なお、ＰＥＮ／ＰＥＴブレンド用のスクリ
ュ構成として、特開平9-52277号公報には、 未溶融物発
生等の可塑化不良を低減するスクリュ構成が開示されて
いる。As a screw configuration for a PEN / PET blend, Japanese Patent Application Laid-Open No. 9-52277 discloses a screw configuration for reducing poor plasticization such as generation of unmelted material.

【０００７】[0007]

【発明が解決しようとする課題】本発明の目的は、ＰＥ
ＮをＰＥＴとブレンドして成形するときに、速やかにエ
ステル交換反応を進ませて透明化し、また、アセトアル
デヒドの生成を抑制する成形品の製造方法を提供するこ
とにある。本発明は、さらに、第三成分を配合したり共
重合ポリマーを併用することなく、生産性を低下させる
ことなく、アセトアルデヒド含有量の少ないＰＥＴ／Ｐ
ＥＮのブレンド体からなる成形品の製造方法を提供する
ことを課題とする。SUMMARY OF THE INVENTION An object of the present invention is to provide PE
It is an object of the present invention to provide a method for producing a molded article in which, when N is blended with PET and molded, the transesterification reaction proceeds promptly to make the mixture transparent, and the generation of acetaldehyde is suppressed. The present invention further relates to a PET / P having a low acetaldehyde content without blending a third component or using a copolymer together, without reducing productivity.
An object of the present invention is to provide a method for producing a molded article comprising a blend of EN.

【０００８】[0008]

【課題を解決するための手段】すなわち本発明は、ポリ
エチレンナフタレンジカルボキシレート９９〜１重量％
およびポリエチレンテレフタレート１〜９９重量％を含
有する熱可塑性ポリエステル組成物を溶融混練して成形
する成形方法において、溶融混練をシリンダとスクリュ
とを備えるスクリュ式可塑化装置を用いて行ない、該ス
クリュは下記の条件を全て満足する構成のスクリュであ
ることを特徴とする成形方法である。 0(%)＜（mL−pL）／スクリュ全長＜30( %) （ただし、mLはホッパーから混練部開始点までの距離、
pLはホッパーから溶融部終了点までの距離である）That is, the present invention relates to a polyethylene naphthalenedicarboxylate of 99 to 1% by weight.
And melt-kneading a thermoplastic polyester composition containing 1 to 99% by weight of polyethylene terephthalate and shaping by melt-kneading using a screw-type plasticizing apparatus having a cylinder and a screw. A molding method characterized in that the screw has a configuration that satisfies all of the above conditions. 0 (%) <(mL-pL) / Total screw length <30 (%) (However, mL is the distance from the hopper to the starting point of the kneading section,
pL is the distance from the hopper to the melting point end point)

【０００９】本発明はまた、ポリエチレンナフタレンジ
カルボキシレート９９〜１重量％およびポリエチレンテ
レフタレート１〜９９重量％を含有する熱可塑性ポリエ
ステル組成物を溶融混練する工程を含む成形品の製造方
法において、溶融混練をシリンダとスクリュとを備える
スクリュ式可塑化装置を用いて行ない、該スクリュは下
記の条件を全て満足する構成のスクリュであることを特
徴とする成形品の製造方法である。 0(%)＜（mL−pL）／スクリュ全長＜30(%) （ただし、mLはホッパーから混練部開始点までの距離、
pLはホッパーから溶融部終了点までの距離である）The present invention also provides a method for producing a molded article, which comprises a step of melt-kneading a thermoplastic polyester composition containing 99 to 1% by weight of polyethylene naphthalenedicarboxylate and 1 to 99% by weight of polyethylene terephthalate. Using a screw-type plasticizing device having a cylinder and a screw, wherein the screw has a configuration satisfying all the following conditions. 0 (%) <(mL-pL) / Total screw length <30 (%) (However, mL is the distance from the hopper to the starting point of the kneading section,
pL is the distance from the hopper to the melting point end point)

【００１０】以下、本発明を詳細に説明する。ＰＥＮ
は、ナフタレンジカルボン酸成分を主たる成分とするジ
カルボン酸成分とエチレングリコール成分を主たる成分
とするジオール成分とからなるポリエステルである。主
たる成分とは、ジカルボン酸成分にあっては、好ましく
は全ジカルボン酸成分の５０モル％以上、さらに好まし
くは８０モル％をいい、ジオール成分にあっては、好ま
しくは全ジオール成分の５０モル％以上、さらに好まし
くは８０モル％をいう。Hereinafter, the present invention will be described in detail. PEN
Is a polyester comprising a dicarboxylic acid component having a naphthalenedicarboxylic acid component as a main component and a diol component having an ethylene glycol component as a main component. The main component means preferably 50 mol% or more, more preferably 80 mol% of the total dicarboxylic acid component in the case of the dicarboxylic acid component, and preferably 50 mol% of the total diol component in the case of the diol component. As mentioned above, more preferably, it refers to 80 mol%.

【００１１】ＰＥＴは、テレフタル酸成分を主たる成分
とするジカルボン酸成分とエチレングリコール成分を主
たる成分とするジオール成分とからなるポリエステルで
ある。主たる成分とは、ジカルボン酸成分にあっては、
好ましくは全ジカルボン酸成分の５０モル％以上、さら
に好ましくは８０モル％をいい、ジオール成分にあって
は、好ましくは全ジオール成分の５０モル％以上、さら
に好ましくは８０モル％をいう。PET is a polyester comprising a dicarboxylic acid component having a terephthalic acid component as a main component and a diol component having an ethylene glycol component as a main component. The main component, in the case of the dicarboxylic acid component,
Preferably, it refers to 50 mol% or more, more preferably 80 mol% of the total dicarboxylic acid component. In the case of the diol component, it preferably refers to 50 mol% or more, more preferably 80 mol% of the total diol component.

【００１２】ＰＥＮおよびＰＥＴは、共重合成分を共重
合したものであってもよく、他種の樹脂とブレンドした
ものであってもよい。[0012] PEN and PET may be those obtained by copolymerizing a copolymer component, or may be those obtained by blending with another kind of resin.

【００１３】すなわち、ＰＥＮおよびＰＥＴは、全ジカ
ルボン酸成分の５０モル％、さらには４０モル％までの
共重合成分の共重合、全ジオール成分の５０モル％、さ
らには４０モル％までの共重合成分の共重合を許容し、
エチレンテレフタレート単位またはエチレンナフタレン
ジカルボキシレート単位が全樹脂成分の４０重量％、さ
らには５０モル％以上である範囲での、他種の樹脂との
ブレンドを許容する。That is, PEN and PET are copolymerized with 50 mol%, more preferably up to 40 mol%, of the total dicarboxylic acid component and 50 mol%, more preferably, up to 40 mol% of the total diol component. Allow copolymerization of components,
It allows blending with other resins in the range where ethylene terephthalate units or ethylene naphthalenedicarboxylate units are at least 40% by weight of the total resin component, or even 50 mole% or more.

【００１４】本発明において、ＰＥＮとＰＥＴは、シリ
ンダとスクリュとを備えるスクリュ式可塑化装置を有す
る成形機に、固体状態で混合し供給されて溶融混練され
る。スクリュとしては、例えば単軸、二軸同方向、二軸
異方向のスクリュを適用できる。In the present invention, PEN and PET are mixed and supplied in a solid state to a molding machine having a screw-type plasticizing device having a cylinder and a screw, and are melt-kneaded. As the screw, for example, a screw having a single axis, two axes in the same direction, and two axes in different directions can be used.

【００１５】本発明で重要なことは、スクリュを構成す
る溶融部と混練部との位置関係である。スクリュは下記
の条件を満足する構成のスクリュであることが必要であ
る。この条件を満足すると、低い温度および短い時間で
相溶化することが可能である。 0(%)＜（mL−pL）／スクリュ全長＜30(%) （ただし、mLはホッパーから混練部開始点までの距離、
pLはホッパーから溶融部終了点までの距離である）What is important in the present invention is the positional relationship between the melting portion and the kneading portion constituting the screw. It is necessary that the screw has a configuration satisfying the following conditions. If this condition is satisfied, it is possible to compatibilize at a low temperature and for a short time. 0 (%) <(mL-pL) / Total screw length <30 (%) (However, mL is the distance from the hopper to the starting point of the kneading section,
pL is the distance from the hopper to the melting point end point)

【００１６】相溶化速度の観点から、スクリュは下記の
条件を満足する構成であることが好ましい。 0(%)＜（mL−pL）＜20(%)From the viewpoint of the compatibilization rate, it is preferable that the screw satisfies the following conditions. 0 (%) <(mL-pL) <20 (%)

【００１７】溶融部とは、固体状の樹脂材料を加熱溶融
する機構を有するスクリュ部位である。この溶融部でシ
リンダーからの伝熱およびスクリュ回転による摩擦発熱
および剪断発熱によって樹脂材料は加熱溶融する。 Ｐ
ＥＮおよびＰＥＴである樹脂材料は、溶融部で溶融混合
されてエステル交換が進み透明化する。溶融部は、単軸
スクリュにおいては圧縮部であり、二軸スクリュにおい
てはフルフライトによる圧縮部と剪断を発生させるニー
ディングディスクとで構成されるスクリュ部位である。
溶融部自体の構成は任意に定めることができる。The melting portion is a screw portion having a mechanism for heating and melting a solid resin material. In the melting portion, the resin material is heated and melted by friction heat and shear heat generated by heat transfer from the cylinder and rotation of the screw. P
The resin materials, which are EN and PET, are melted and mixed in the melting part, transesterification proceeds, and becomes transparent. The fusion part is a compression part in a single screw, and a screw part composed of a compression part by full flight and a kneading disk that generates shear in a twin screw.
The configuration of the melting portion itself can be arbitrarily determined.

【００１８】混練部とは、溶融状態の樹脂をスクリュ回
転力により混合する機構を有するスクリュ部位である。
混練部は、単軸スクリュにおいては例えばダルメージ、
ピンミキシングであり、二軸スクリュにおいては例えば
ニーディングディスク、ローターである。The kneading section is a screw portion having a mechanism for mixing a molten resin by a screw rotating force.
The kneading section is, for example, in a single screw, dalmage,
This is pin mixing, and in the case of a twin screw, for example, a kneading disk and a rotor are used.

【００１９】混合部自体の構造は任意に定めることがで
きる。溶融樹脂を効率よく混合する機構を有する構造を
適用することができる。The structure of the mixing section itself can be arbitrarily determined. A structure having a mechanism for efficiently mixing the molten resin can be applied.

【００２０】本発明の成形方法および成形品の製造方法
においては、特開平2-274757号公報に記載されているＰ
ＥＮとＰＥＴの予備混合物を成形時に配合する手法を適
用してもよく、また、特開平9-157505号公報および特開
平9-208678号公報に記載されている共重合ＰＥＮとＰＥ
Ｔを用いる手法を適用してもよく、これれの手法を適用
すると透明化が容易に進み、アセトアルデヒドの生成が
抑制され、かつ生産性が向上して好ましい。In the molding method and the method for producing a molded product according to the present invention, the P method described in Japanese Patent Application Laid-Open
A method of blending a pre-mixture of EN and PET at the time of molding may be applied, and copolymerized PEN and PE described in JP-A-9-157505 and JP-A-9-208678 may be used.
A method using T may be applied, and when these methods are applied, transparency is easily promoted, generation of acetaldehyde is suppressed, and productivity is improved, which is preferable.

【００２１】[0021]

【実施例】以下、実施例によりさらに詳細に説明する。
なお、特性の測定は、以下の方法によって行った。The present invention will be described in more detail with reference to the following examples.
The characteristics were measured by the following method.

【００２２】［揮発性成分含有量］成形品を粉砕して試
料とした。そしてヘッドスペースガスクロ分析器にて、
１５０℃で１時間加熱時に３gの試料から放出されるア
セトアルデヒド量（以下、ＡＡ量という。）を定量分析
した。[Content of Volatile Components] The molded article was pulverized into a sample. And with the headspace gas chromatography analyzer,
The amount of acetaldehyde released from a 3 g sample during heating at 150 ° C. for 1 hour (hereinafter referred to as AA amount) was quantitatively analyzed.

【００２３】［エステル交換率］エステル交換率の測定
は、ＤＳＣ（示差走査熱量計）によって測定した融点か
ら下式にて算出した。 エステル交換率ＥＩ（％）＝1020−(融点（℃）×3.88
4) なお上記式の係数は、ＮＭＲ分析から求めたＰＥＮ−Ｐ
ＥＴユニット量と、融点との関係式から求めた。[Ester exchange rate] The ester exchange rate was calculated from the melting point measured by DSC (differential scanning calorimeter) by the following formula. Ester exchange rate EI (%) = 1020-(melting point (° C) x 3.88
4) The coefficient of the above equation is PEN-P obtained from NMR analysis.
It was determined from the relational expression between the amount of the ET unit and the melting point.

【００２４】［樹脂］２，６−ジメチルナフタレンジカ
ルボキシレートとエチレングリコールを常法に従って、
酢酸マンガン触媒でエステル交換反応させた後、リン酸
を添加し反応を停止させ、その後二酸化ゲルマニウムを
添加して溶融重合反応を行い、ＰＥＮポリマーを得た。
得られたＰＥＮポリマーは、ナフタレンジカルボン酸10
0mol%、エチレングリコール100mol%で構成され、２５℃
オルトクロロフェノール溶媒での極限粘度数が0.55であ
り、MI値（MI1）は290℃にて19g/10minであった。この
ＰＥＮポリマー１０重量％にＰＥＴ ポリマー（帝人
（株）製TR-8550T）を９０重量％をブレンドして樹脂材
料として成形に用いた。[Resin] 2,6-dimethylnaphthalenedicarboxylate and ethylene glycol are prepared by a conventional method.
After transesterification with a manganese acetate catalyst, phosphoric acid was added to stop the reaction, and then germanium dioxide was added to carry out a melt polymerization reaction to obtain a PEN polymer.
The resulting PEN polymer is a naphthalenedicarboxylic acid 10
Consists of 0 mol% and ethylene glycol 100 mol% at 25 ° C
The intrinsic viscosity number in an orthochlorophenol solvent was 0.55, and the MI value (MI1) at 290 ° C. was 19 g / 10 min. 90% by weight of a PET polymer (TR-8550T manufactured by Teijin Limited) was blended with 10% by weight of the PEN polymer and used as a resin material for molding.

【００２５】［溶融混練]同方向二軸押出機（日本製鋼
所製 TEX30）を用いた。L/D＝30のスクリューを用い
た。押出機内の樹脂の滞留時間はマーカー法にて測定し
た。[Melting and Kneading] A co-axial twin screw extruder (TEX30 manufactured by Nippon Steel Works) was used. A screw with L / D = 30 was used. The residence time of the resin in the extruder was measured by a marker method.

【００２６】［実施例１］溶融部をC3の位置に、混練部
をC5の位置に設置したスクリュ（図１）を用いてシリン
ダー温度300℃、スクリュ回転数120rpmで溶融混練し
て、吐出された樹脂を評価した。エステル交換率46%の
透明な樹脂が得られた。このときのＡＡ量は21ppmであ
った。用いたスクリュの（（mL−pL）／スクリュ全長）
値は１６．６％であった。Example 1 Using a screw (FIG. 1) in which the melting part was set at the position C3 and the kneading part was set at the position C5, the mixture was melted and kneaded at a cylinder temperature of 300.degree. The resin was evaluated. A transparent resin having a transesterification rate of 46% was obtained. The AA amount at this time was 21 ppm. Screw ((mL-pL) / total screw length)
The value was 16.6%.

【００２７】［比較例１］実施例１に用いたスクリュに
おいて混練部をC12の位置に移動したスクリュ（図２）
を用いて、実施例１と同様に、シリンダー温度300℃、
スクリュ回転数120rpmで溶融混練して、吐出された樹脂
を評価した。エステル交換率18%の白濁した不透明な樹
脂が得られた。このときのＡＡ量は17ppmであった。用
いたスクリュの（（mL−pL）／スクリュ全長）値は７５
％であった。[Comparative Example 1] In the screw used in Example 1, the kneading part was moved to the position of C12 (FIG. 2).
, Using a cylinder temperature of 300 ° C.
The resin was melt-kneaded at a screw rotation speed of 120 rpm, and the discharged resin was evaluated. A cloudy, opaque resin having a transesterification rate of 18% was obtained. At this time, the AA amount was 17 ppm. The value of ((mL-pL) / total screw length) of the screw used was 75
%Met.

【００２８】［比較例２］比較例１と同様の構成のスク
リュで、エステル交換率を高め透明な樹脂を得る為にシ
リンダー温度を３２０℃に上げスクリュ回転数を100rpm
として評価した。その結果、樹脂のエステル交換率51%
の透明な樹脂が得られた。この樹脂のＡＡ量は62ppmで
あった。用いたスクリュの（（mL−pL）／スクリュ全
長）値は７５％であった。Comparative Example 2 A screw having the same structure as in Comparative Example 1 was used. In order to increase the transesterification rate and obtain a transparent resin, the cylinder temperature was raised to 320 ° C. and the screw rotation speed was set to 100 rpm.
Was evaluated. As a result, the transesterification rate of the resin was 51%.
Was obtained. The AA amount of this resin was 62 ppm. The value of ((mL-pL) / length of screw) of the screw used was 75%.

【００２９】[0029]

【発明の効果】本発明によれば、ＰＥＮをＰＥＴとブレ
ンドして成形するときに、速やかにエステル交換反応を
進ませて透明化し、また、アセトアルデヒドの生成を抑
制する成形品の製造方法を提供することができる。本発
明によれば、さらに、第三成分を配合したり共重合ポリ
マーを併用することなく、生産性を低下させることな
く、アセトアルデヒド含有量の少ないＰＥＴ／ＰＥＮの
ブレンド体からなる成形品の製造方法を提供することが
できる。According to the present invention, there is provided a method for producing a molded article in which, when PEN is blended with PET and molded, the transesterification reaction proceeds promptly to make the mixture transparent, and the production of acetaldehyde is suppressed. can do. According to the present invention, there is further provided a method for producing a molded article comprising a PET / PEN blend having a low acetaldehyde content without blending a third component or using a copolymer, and without reducing productivity. Can be provided.

【図面の簡単な説明】[Brief description of the drawings]

【図１】実施例１のスクリュ構成である。FIG. 1 shows a screw configuration of a first embodiment.

【図２】比較例１および２のスクリュ構成である。FIG. 2 shows a screw configuration of Comparative Examples 1 and 2.

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F201 AA24K AH55 AR12 BA01 BC01 BC12 BC37 BK02 BK13 BK25 BK26 BK33 BK40 4G078 AA04 AB11 BA01 DA09 4J002 CF06X CF08W GG00  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AA24K AH55 AR12 BA01 BC01 BC12 BC37 BK02 BK13 BK25 BK26 BK33 BK40 4G078 AA04 AB11 BA01 DA09 4J002 CF06X CF08W GG00

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 ポリエチレンナフタレンジカルボキシレ
ート９９〜１重量％およびポリエチレンテレフタレート
１〜９９重量％を含有する熱可塑性ポリエステル組成物
を溶融混練して成形する成形方法において、溶融混練を
シリンダとスクリュとを備えるスクリュ式可塑化装置を
用いて行ない、該スクリュは下記の条件を全て満足する
構成のスクリュであることを特徴とする成形方法。 0(%)＜（mL−pL）／スクリュ全長＜30(%) （ただし、mLはホッパーから混練部開始点までの距離、
pLはホッパーから溶融部終了点までの距離である）1. A molding method for melt-kneading and molding a thermoplastic polyester composition containing 99 to 1% by weight of polyethylene naphthalene dicarboxylate and 1 to 99% by weight of polyethylene terephthalate. A forming method characterized by using a screw-type plasticizing device provided, wherein the screw has a configuration satisfying all of the following conditions. 0 (%) <(mL-pL) / Total screw length <30 (%) (However, mL is the distance from the hopper to the starting point of the kneading section,
pL is the distance from the hopper to the melting point end point) 【請求項２】 ポリエチレンナフタレンジカルボキシレ
ート９９〜１重量％およびポリエチレンテレフタレート
１〜９９重量％を含有する熱可塑性ポリエステル組成物
を溶融混練する工程を含む成形品の製造方法において、
溶融混練をシリンダとスクリュとを備えるスクリュ式可
塑化装置を用いて行ない、該スクリュは下記の条件を全
て満足する構成のスクリュであることを特徴とする成形
品の製造方法。 0(%)＜（mL−pL）／スクリュ全長＜30(%) （ただし、mLはホッパーから混練部開始点までの距離、
pLはホッパーから溶融部終了点までの距離である）2. A method for producing a molded article comprising a step of melt-kneading a thermoplastic polyester composition containing 99 to 1% by weight of polyethylene naphthalene dicarboxylate and 1 to 99% by weight of polyethylene terephthalate,
A method for producing a molded product, characterized in that melt kneading is performed using a screw-type plasticizing device having a cylinder and a screw, and the screw has a configuration satisfying all of the following conditions. 0 (%) <(mL-pL) / Total screw length <30 (%) (However, mL is the distance from the hopper to the starting point of the kneading section,
pL is the distance from the hopper to the melting point end point)
JP36643299A 1999-12-24 1999-12-24 Molding method and method for manufacturing molded article Pending JP2001179733A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36643299A JP2001179733A (en) 1999-12-24 1999-12-24 Molding method and method for manufacturing molded article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36643299A JP2001179733A (en) 1999-12-24 1999-12-24 Molding method and method for manufacturing molded article

Publications (1)

Publication Number Publication Date
JP2001179733A true JP2001179733A (en) 2001-07-03

Family

ID=18486775

Family Applications (1)

Application Number Title Priority Date Filing Date
JP36643299A Pending JP2001179733A (en) 1999-12-24 1999-12-24 Molding method and method for manufacturing molded article

Country Status (1)

Country Link
JP (1) JP2001179733A (en)

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