JP3718627B2 - Storage method of polycarbonate resin for wet molding - Google Patents
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- JP3718627B2 JP3718627B2 JP2000320637A JP2000320637A JP3718627B2 JP 3718627 B2 JP3718627 B2 JP 3718627B2 JP 2000320637 A JP2000320637 A JP 2000320637A JP 2000320637 A JP2000320637 A JP 2000320637A JP 3718627 B2 JP3718627 B2 JP 3718627B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、湿式成形用ポリカーボネート樹脂の保存方法に関する。さらに詳しくは乾燥したポリカーボネート樹脂を乾燥状態のまま保存する湿式成形用ポリカーボネート樹脂の保存方法に関する。なお、本発明におけるポリカーボネート樹脂の保存とは、一定の場所で移動させずに保管すること、およびある場所から別の場所へ移動させながら（輸送しながら）保管することを意味するものとする。
【０００２】
【従来の技術】
従来、２，２−ビス（４−ヒドロキシフェニル）プロパン（以下、ビスフェノールＡと略称する）にカーボネート前駆物質を反応させて得られるポリカーボネート樹脂は透明性、耐熱性、機械的特性、寸法安定性が優れているためにエンジニアリングプラスチックとして多くの分野に広く使用されている。また、種々のビスフェノールからのホモあるいはコポリカーボネートも知られており、その特性に応じた分野に用いられている。
【０００３】
しかしながら、ポリカーボネート樹脂はカーボネート結合を有するがゆえに若干の吸水性を有し、特に湿式成形に際して溶媒に溶解する場合、含水率が大きい場合には白濁を生じ、得られるフィルムが白濁したり、表面性が悪化することがあり、また、金属板に流延した際、塩化メチレン等溶媒の種類によっては錆の問題が生じる場合がある。このため、湿式成形する前には、ポリカーボネート樹脂を十分に乾燥する必要があった。
【０００４】
また、ポリカーボネート樹脂は、特に光ディスク用途において、保存（もしくは輸送）途中に異物の混入を防止するためステンレス製コンテナやタンクローリーにポリカーボネート樹脂粒状体を充填して保存する方法が一般的に使用されている（特開２０００−１６８７２５号公報等）。このコンテナやタンクローリーによりポリカーボネート樹脂粒状体を保存する方法では、光ディスクの品質に影響を及ぼす異物の混入を防止する効果に優れ、吸湿を防ぐ効果もある。ただし、かかるコンテナやタンクローリーによる保存に関して、乾燥気体を導入し、コンテナやタンクローリー内を完全に該乾燥気体で置換するのには、十分な時間が必要になること、また、ポリカーボネート樹脂粒状体を充填および排出する際、吸湿を防止する必要があることなど煩雑な作業となることがあった。
【０００５】
湿式成形用ポリカーボネート樹脂は、これを溶媒に溶解して、位相差フィルムやバインダー等の各種フィルムを成形する際に、上述のように水分による悪影響を受け易く、したがって、より簡便で、湿式成形する前に再乾燥を行う必要のない保存方法が求められていた。
【０００６】
【発明が解決しようとする課題】
本発明の目的は、溶媒に溶解する前に乾燥する必要のない湿式成形用ポリカーボネート樹脂の保存方法を提供することにある。
本発明者はこの目的を達成せんとして鋭意研究を重ねた結果、乾燥したポリカーボネート樹脂を水分不透過性のフレキシブル袋に密封して保存することによって、上記目的を達成できることを見出し、本発明に到達した。
【０００７】
【課題を解決するための手段】
すなわち、本発明によれば、乾燥ポリカーボネート樹脂を水分不透過性フレキシブル袋に密封して保存することを特徴とする湿式成形用ポリカーボネート樹脂の保存方法が提供される。
【０００８】
本発明の水分不透過性のフレキシブル袋としては、空気中の水分を通さない素材を使用したフレキシブル袋であればよく、その内容量としては、１０〜１００Ｌの内容量の範囲が好ましく、１０〜５０Ｌの内容量の範囲がより好ましい。ハードコンテナ等は、大量輸送に好適であるが、一方本発明のフレキシブル袋は、小分けが容易で、例えば数種のポリマーを溶液に溶解混合する時に取り扱い易い利点がある。また、形状が小さく、輸送時に特殊な装備が不要であり、保存場所の確保も容易である。
【０００９】
本発明の水分不透過性のフレキシブル袋としては、アルミ防湿袋が好ましく使用される。このアルミ防湿袋は、保存する際に密封できる構造であることが必要であり、厚み２０〜７０μｍのポリエチレン（ＰＥ）フィルムおよび／またはポリプロピレン（ＰＰ）フィルムを厚み１０〜２０μｍのアルミニウム箔に積層した構造で袋状としたものが好ましく使用される。このような構造のアルミ防湿袋は、軽く且つ熔封により容易に密封でき、開封も容易である。アルミ防湿袋としては、市販の４層あるいは５層構造のもので十分に空気中の水分を遮断でき、好適に用いられる。かかるアルミ防湿袋は、適当に裁断、融着して更に小容量の袋にして用いることも容易にできる。このアルミ防湿袋は小口、ワンウエイ用途に適しており、湿式成形用途のような小口用途用には好ましい。
【００１０】
本発明に用いられるポリカーボネート樹脂は、全芳香族ジヒドロキシ成分の１モル％以上、好ましくは５モル％以上、より好ましくは１０モル％以上、さらに好ましくは３０モル％以上が、１，１−ビス（４−ヒドロキシフェニル）シクロヘキサン、２，２−ビス（４−ヒドロキシ−３−メチルフェニル）プロパン、９，９−ビス（４−ヒドロキシフェニル）フルオレン、９，９−ビス（４−ヒドロキシ−３−メチルフェニル）フルオレン、１，１−ビス（４−ヒドロキシフェニル）−３，３，５−トリメチルシクロヘキサン、α，α′−ビス（４−ヒドロキシフェニル）−ｍ−ジイソプロピルベンゼンよりなる群から選ばれる少なくとも１種のジヒドロキシ成分より得られるポリカーボネート樹脂であることが望ましい。
【００１１】
湿式成形用のポリカーボネート樹脂は、ＤＳＣの測定で融点が認められない非晶性のポリカーボネート樹脂であることが、有機溶媒への溶解性に優れ好ましい。上記ジヒドロキシ成分を１モル％以上含むポリカーボネート樹脂は、有機溶媒に溶解した場合の溶解性が改善され、溶液を長期保存した時に濁りを生じ難い等の利点がある。
【００１２】
湿式成形の際にポリカーボネート樹脂を溶解する溶媒としては、例えば塩化メチレン、ジオキソラン、トルエン、ジオキサン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等の有機溶媒が好ましい。これらは一種でもよいし、二種以上の混合溶媒でもよい。また、好ましくは５〜３０重量％、より好ましくは１０〜２５重量％濃度の溶液が好適に用いられる。
【００１３】
保存されるポリカーボネート樹脂はペレット状、フレーク状、パウダー状のいずれの形状で用いてもよいが、有機溶媒への溶解のし易さから表面積の大きいフレーク状またはパウダー状のものが好ましい。保存されるポリカーボネート樹脂は、乾燥機にて乾燥終了後の含水率が、好ましくは１０００ｐｐｍ以下であり、より好ましくは７００ｐｐｍ以下、さらに好ましくは５００ｐｐｍ以下のものである。１０００ｐｐｍを超えると、湿式成形後のフィルムが白濁することがあり、成形前に再乾燥する必要の生じる場合がある。
【００１４】
湿式成形用ポリカーボネート樹脂は前述のごとく溶媒に溶解して使用するため、非晶性のポリカーボネート樹脂が好ましく用いられ、固体としては溶媒に溶解し易い、表面積の大きいフレーク状またはパウダー状のものが好ましく使用される。本発明においては、このフレーク状またはパウダー状の樹脂を再乾燥する際に必要な微粉の舞い上がりを防止した特別の乾燥機を必要とせず、この再乾燥工程を省略できることは工業的に大きな利点である。
【００１５】
湿式成形により得られたポリカーボネート樹脂の用途としては、各種フィルム、例えば位相差フィルム、プラセル基板、ＥＬ表示用フィルム等の各種表示用フィルム、電子写真感光体用のバインダー、気体分離膜、紫外線あるいは赤外線吸収剤入りフィルム等の機能フィルムがある。
【００１６】
【実施例】
以下に実施例を挙げて本発明をさらに説明する。なお、評価は下記の方法によった。
（１）含水率：ポリマー０．５ｇを微量天秤にて精秤し、全量滴定式水分測定装置（三菱化学製 ＣＡ−０６）にて滴定液アクアミクロンＡＸ、対極液アクアミクロンＣＸＵを用いて自動滴定して求めた。
（２）比粘度：ポリマー０．７ｇを塩化メチレン１００ｍｌに溶解し２０℃の温度で測定した。
（３）成形不良
○；透明で表面性、外観の良好なフィルムである。
×；フィルムの一部が曇りを生じたり、表面性が悪くなったものである。
【００１７】
［実施例１］
１，１−ビス（４−ヒドロキシフェニル）シクロヘキサンから界面縮重合法により得られたポリカーボネート樹脂（比粘度０．３７５）のフレークを、１２０℃、６時間乾燥し、含水率３３０ｐｐｍとした。この乾燥フレークを、京阪セロハン（株）製アルミ防湿袋（外側からＰＰ３０μｍ、サンドＰＥ２０μｍ、アルミニウム１２μｍ、サンドＰＥ２０μｍ、ＰＥ６０μｍの積層袋）に入れ密封した。約１年後に開封して、含水率を測定したところ３３０ｐｐｍと保存中の吸湿はなかった。このフレーク２０部を塩化メチレン８０部に溶解したところ完全に透明で濁りはなかった。また、流涎法にてキャスティングフィルムを作製したところ、透明で表面性、外観の良好なフィルムが得られた。
【００１８】
さらに、この塩化メチレン溶液にポリカーボネート樹脂と同量のヒドラジン系電荷輸送化合物を加えたものを電荷輸送層として電荷発生層を塗布したアルミニウム製ドラムに浸漬法によって塗布し、乾燥して２０μｍの電荷輸送層を形成して電子写真感光体を得た。このものを用いたレーザービームプリンターの印刷性能は良好であった。
【００１９】
［実施例２］
ビスフェノールＡと９，９−ビス（４−ヒドロキシ−３−メチルフェニル）フルオレンとのモル比が５０：５０の共重合ポリカーボネート樹脂（比粘度０．６８１）のフレークを、１２０℃、６時間乾燥し、含水率５３０ｐｐｍとした。この乾燥フレークを、京阪セロハン（株）製アルミ防湿袋に入れ密封した。約１か月後に開封して、含水率を測定したところ５４０ｐｐｍと保存中の吸湿はほとんどなかった。このフレーク２０部を塩化メチレン８０部に溶解して、さらに、流涎法にてキャスティングフィルムを作製したところ、透明で表面性、外観の良好なフィルムが得られた。
【００２０】
また、このポリカーボネート溶液を２０℃でＴダイより移動しているステンレス板上に流延し、徐々に温度を上げながら塩化メチレンを蒸発しステンレス板より剥離して更に加熱して塩化メチレンを除去して２００μｍの厚みのフィルムを得た。このフィルムを２００℃で延伸倍率２．０に一軸延伸した。この延伸した位相差フィルムにバリヤー層および液晶用透明電極をスパッタリングした後、粘着剤を用いて偏向板の片面に光学軸が４５度になるように接着して複合偏向板を得た。次いで、このものをＳＴＮ液晶表示装置の液晶セルと上部偏向板の間に貼り合せて用いたところ、コントラストのよい表示が得られた。
【００２１】
［実施例３］
１，１−ビス（４−ヒドロキシフェニル）−３，３，５−トリメチルシクロヘキサンとα，α′−ビス（４−ヒドロキシフェニル）−ｍ−ジイソプロピルベンゼンとのモル比が５０：５０の共重合ポリカーボネートペレット（比粘度０．４０９）を１２０℃、６時間乾燥し、含水率２１０ｐｐｍとした。この乾燥ペレットを、大阪パック（株）製アルミ防湿袋（外側からＰＰ２０μｍ、ＰＥ２０μｍ、アルミニウム１２μｍ、ＰＥ７０μｍの積層袋に、厚み７０μｍのＰＥ袋入り）に入れ密封した。約１か月後開封し、含水率を測定したところ２２０ｐｐｍと保存中の吸湿はほとんどなかった。このペレット２０部を塩化メチレン８０部に溶解して、さらに、流涎法にてキャスティングフィルムを作製したところ、透明で表面性、外観の良好なフィルムが得られた。
【００２２】
［比較例１］
実施例３の乾燥した共重合ポリカーボネートペレットを、厚み７０μｍのＰＥを内袋とした紙袋に収袋し、ミシン掛けして保存した。約１か月後開封し、含水率を測定したところ２１００ｐｐｍであった。このペレット２０部を実施例３と同様にして塩化メチレン８０部に溶解し、次いで、キャスティングフィルムを作製したところ、白濁して満足なフィルムは得られなかった。
【００２３】
［比較例２］
実施例２の乾燥した共重合ポリカーボネートのフレークを、厚み７０μｍのＰＥを内袋とした紙袋に収袋し、ミシン掛けして保存した。約１か月後開封し、含水率を測定したところ２５００ｐｐｍであった。このフレーク２０部を実施例２と同様にして塩化メチレン８０部に溶解し、次いで、キャスティングフィルムを作製したところ、塩化メチレン溶液が若干濁り、フィルム製膜時のステンレス板表面が錆により薄く曇りを生じた。また、得られたフィルムの表面平滑性も不良となった。
【００２４】
【表１】
【発明の効果】
本発明のポリカーボネート樹脂の保存方法によれば、湿式成形前に再乾燥することなく、良好なフィルムが得られ、その奏する工業的効果は格別である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for storing a polycarbonate resin for wet molding. More particularly, the present invention relates to a method for storing a polycarbonate resin for wet molding, in which a dried polycarbonate resin is stored in a dry state. In addition, the preservation | save of the polycarbonate resin in this invention shall mean storing without moving at a fixed place, and storing while moving (transporting) from one place to another place.
[0002]
[Prior art]
Conventionally, polycarbonate resin obtained by reacting a carbonate precursor with 2,2-bis (4-hydroxyphenyl) propane (hereinafter abbreviated as bisphenol A) has transparency, heat resistance, mechanical properties, and dimensional stability. Due to its superiority, it is widely used as an engineering plastic in many fields. In addition, homo- or copolycarbonates from various bisphenols are also known and used in fields corresponding to their characteristics.
[0003]
However, since the polycarbonate resin has a carbonate bond, it has a slight water absorption, particularly when it is dissolved in a solvent during wet molding, when the water content is high, it becomes cloudy, and the resulting film becomes cloudy or has surface properties. May deteriorate, and when cast on a metal plate, rust problems may occur depending on the type of solvent such as methylene chloride. For this reason, it was necessary to dry the polycarbonate resin sufficiently before wet molding.
[0004]
In addition, a method of filling polycarbonate resin particles into a stainless steel container or tank lorry and storing the polycarbonate resin is generally used in order to prevent contamination by foreign substances during storage (or transportation), particularly in optical disk applications. (Japanese Unexamined Patent Publication No. 2000-168725). The method of preserving the polycarbonate resin granular material using this container or tank lorry is excellent in preventing foreign matters that affect the quality of the optical disk, and also has an effect of preventing moisture absorption. However, with regard to storage by such containers and tank trucks, sufficient time is required to introduce a dry gas and completely replace the inside of the container or tank truck with the dry gas. Further, when discharging, it may be troublesome work such as the need to prevent moisture absorption.
[0005]
When the polycarbonate resin for wet molding is dissolved in a solvent and various films such as a retardation film and a binder are molded, the polycarbonate resin is easily affected by moisture as described above. There was a need for a storage method that did not require prior re-drying.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for storing a polycarbonate resin for wet molding that does not need to be dried before being dissolved in a solvent.
As a result of intensive research aimed at achieving this object, the present inventor has found that the above object can be achieved by sealing and storing the dried polycarbonate resin in a moisture-impermeable flexible bag. did.
[0007]
[Means for Solving the Problems]
That is, according to the present invention, there is provided a method for storing a polycarbonate resin for wet molding, wherein the dry polycarbonate resin is sealed and stored in a moisture-impermeable flexible bag.
[0008]
The moisture-impermeable flexible bag of the present invention may be a flexible bag that uses a material that does not allow moisture in the air to pass through. The inner volume is preferably in the range of 10 to 100 L, A range of internal volume of 50 L is more preferred. A hard container or the like is suitable for mass transportation, while the flexible bag of the present invention is easy to divide and has an advantage that it is easy to handle when, for example, several kinds of polymers are dissolved and mixed in a solution. In addition, the shape is small, no special equipment is required for transportation, and it is easy to secure a storage location.
[0009]
As the moisture-impermeable flexible bag of the present invention, an aluminum moisture-proof bag is preferably used. This aluminum moisture-proof bag needs to have a structure that can be sealed when stored, and a polyethylene (PE) film and / or a polypropylene (PP) film having a thickness of 20 to 70 μm are laminated on an aluminum foil having a thickness of 10 to 20 μm. A bag-like structure is preferably used. The aluminum moisture-proof bag having such a structure is light and can be easily sealed by sealing, and can be easily opened. As the aluminum moisture-proof bag, a commercially available four-layer or five-layer structure can sufficiently block moisture in the air and is preferably used. Such an aluminum moisture-proof bag can be easily cut and fused to make a smaller capacity bag. This aluminum moisture-proof bag is suitable for small mouth and one-way applications, and is preferable for small mouth applications such as wet molding applications.
[0010]
The polycarbonate resin used in the present invention contains 1 mol% or more of the wholly aromatic dihydroxy component, preferably 5 mol% or more, more preferably 10 mol% or more, and further preferably 30 mol% or more. 4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methyl) At least one selected from the group consisting of phenyl) fluorene, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene. A polycarbonate resin obtained from a kind of dihydroxy component is desirable.
[0011]
The polycarbonate resin for wet molding is preferably an amorphous polycarbonate resin having no melting point as measured by DSC because of its excellent solubility in organic solvents. The polycarbonate resin containing 1 mol% or more of the dihydroxy component has advantages such as improved solubility when dissolved in an organic solvent and less turbidity when the solution is stored for a long time.
[0012]
As the solvent for dissolving the polycarbonate resin in the wet molding, for example, organic solvents such as methylene chloride, dioxolane, toluene, dioxane, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone are preferable. These may be one kind or a mixed solvent of two or more kinds. Further, a solution having a concentration of preferably 5 to 30% by weight, more preferably 10 to 25% by weight is preferably used.
[0013]
The polycarbonate resin to be stored may be used in any form of pellets, flakes, and powders, but is preferably flakes or powders having a large surface area because of easy dissolution in an organic solvent. The polycarbonate resin to be stored has a water content after drying in a dryer of preferably 1000 ppm or less, more preferably 700 ppm or less, and even more preferably 500 ppm or less. If it exceeds 1000 ppm, the film after wet molding may become cloudy and may need to be re-dried before molding.
[0014]
Since the polycarbonate resin for wet molding is used by dissolving in a solvent as described above, an amorphous polycarbonate resin is preferably used, and the solid is preferably a flake or powder having a large surface area that is easily dissolved in the solvent. used. In the present invention, there is no need for a special dryer that prevents the fine powder from rising when the flaky or powdery resin is re-dried, and it is an industrially significant advantage that this re-drying step can be omitted. is there.
[0015]
The polycarbonate resin obtained by wet molding can be used for various films, for example, various display films such as retardation films, placer substrates, EL display films, binders for electrophotographic photoreceptors, gas separation membranes, ultraviolet rays or infrared rays. There are functional films such as absorbent film.
[0016]
【Example】
The following examples further illustrate the present invention. The evaluation was based on the following method.
(1) Moisture content: 0.5 g of polymer is precisely weighed with a microbalance, and is automatically measured using a titration liquid Aquamicron AX and a counter electrode liquid Aquamicron CXU with a total titration moisture measuring device (CA-06 manufactured by Mitsubishi Chemical). Determined by titration.
(2) Specific viscosity: 0.7 g of polymer was dissolved in 100 ml of methylene chloride and measured at a temperature of 20 ° C.
(3) Molding failure ◯: It is a transparent film having good surface properties and appearance.
X: A part of the film is cloudy or has poor surface properties.
[0017]
[Example 1]
Flakes of polycarbonate resin (specific viscosity 0.375) obtained from 1,1-bis (4-hydroxyphenyl) cyclohexane by interfacial condensation polymerization were dried at 120 ° C. for 6 hours to a moisture content of 330 ppm. The dried flakes were put in an aluminum moisture-proof bag (PP 30 μm, sand PE 20 μm, aluminum 12 μm, sand PE 20 μm, PE 60 μm laminated bag from the outside) manufactured by Keihan Cellophane Co., Ltd. and sealed. About one year later, the package was opened and the moisture content was measured. As a result, it was 330 ppm and there was no moisture absorption during storage. When 20 parts of the flakes were dissolved in 80 parts of methylene chloride, the flakes were completely transparent and not cloudy. Further, when a casting film was produced by the fluent method, a transparent film having good surface properties and appearance was obtained.
[0018]
Further, a solution obtained by adding the same amount of a hydrazine-based charge transporting compound as that of the polycarbonate resin to this methylene chloride solution is applied to an aluminum drum coated with a charge generating layer as a charge transporting layer by a dipping method, and dried to transport a charge of 20 μm. A layer was formed to obtain an electrophotographic photoreceptor. The printing performance of the laser beam printer using this was good.
[0019]
[Example 2]
The flakes of copolymer polycarbonate resin (specific viscosity 0.681) having a molar ratio of bisphenol A and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene of 50:50 were dried at 120 ° C. for 6 hours. The water content was 530 ppm. The dried flakes were sealed in an aluminum moisture-proof bag made by Keihan Cellophane Co., Ltd. After opening about one month, the moisture content was measured and found to be 540 ppm with little moisture absorption during storage. When 20 parts of the flakes were dissolved in 80 parts of methylene chloride, and a casting film was further produced by the fluent method, a transparent film having good surface properties and appearance was obtained.
[0020]
Moreover, this polycarbonate solution is cast on a stainless steel plate moving from a T-die at 20 ° C., methylene chloride is evaporated while gradually raising the temperature, peeled off from the stainless steel plate, and further heated to remove methylene chloride. A film having a thickness of 200 μm was obtained. This film was uniaxially stretched at 200 ° C. to a draw ratio of 2.0. A barrier layer and a transparent electrode for liquid crystal were sputtered on the stretched retardation film, and then adhered to one side of the deflection plate with an adhesive so that the optical axis was 45 degrees to obtain a composite deflection plate. Subsequently, when this was used by being bonded between the liquid crystal cell of the STN liquid crystal display device and the upper deflection plate, a display with good contrast was obtained.
[0021]
[Example 3]
Copolymer polycarbonate having a molar ratio of 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene of 50:50 The pellets (specific viscosity 0.409) were dried at 120 ° C. for 6 hours to a moisture content of 210 ppm. This dried pellet was sealed in an aluminum moisture-proof bag made by Osaka Pack Co., Ltd. (from the outside into a laminated bag of 20 μm PP, 20 μm PE, 12 μm aluminum, 70 μm PE, and 70 μm thick PE bag). After opening about one month, the moisture content was measured. As a result, there was almost no moisture absorption during storage at 220 ppm. When 20 parts of the pellets were dissolved in 80 parts of methylene chloride and a casting film was produced by a fluent method, a transparent film with good surface properties and appearance was obtained.
[0022]
[Comparative Example 1]
The dried copolymerized polycarbonate pellets of Example 3 were collected in a paper bag with PE having a thickness of 70 μm as an inner bag, stored by sewing. After opening about one month, the moisture content was measured and found to be 2100 ppm. 20 parts of the pellets were dissolved in 80 parts of methylene chloride in the same manner as in Example 3, and then a casting film was produced. As a result, the film became cloudy and a satisfactory film was not obtained.
[0023]
[Comparative Example 2]
The dried copolymerized polycarbonate flakes of Example 2 were collected in a paper bag with PE having a thickness of 70 μm as an inner bag, stored by sewing. After about one month, the package was opened and the water content was measured and found to be 2500 ppm. 20 parts of the flakes were dissolved in 80 parts of methylene chloride in the same manner as in Example 2, and then a casting film was prepared. occured. Moreover, the surface smoothness of the obtained film was also poor.
[0024]
[Table 1]
【The invention's effect】
According to the method for preserving a polycarbonate resin of the present invention, a good film can be obtained without re-drying before wet molding, and the industrial effect exhibited by the method is exceptional.
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000320637A JP3718627B2 (en) | 2000-10-20 | 2000-10-20 | Storage method of polycarbonate resin for wet molding |
| TW91109350A TW575604B (en) | 2000-10-20 | 2002-05-06 | Method for preserving dry polycarbonate resin and wetting process for forming said resin |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2000320637A JP3718627B2 (en) | 2000-10-20 | 2000-10-20 | Storage method of polycarbonate resin for wet molding |
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| JP3718627B2 true JP3718627B2 (en) | 2005-11-24 |
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| JP2003327715A (en) * | 2002-05-16 | 2003-11-19 | Mitsubishi Gas Chem Co Inc | Method of storing molded product |
| EP1518880B1 (en) * | 2002-07-09 | 2008-11-12 | Teijin Chemicals, Ltd. | Optical recording medium |
| CA2497069A1 (en) | 2004-02-19 | 2005-08-19 | Dai-Ichi Kogyo Seiyaku Co., Ltd. | Method for drying nonionic alkylene oxide-type water-soluble resin, method for packaging it, and method for transporting it |
| JP2005231675A (en) * | 2004-02-19 | 2005-09-02 | Dai Ichi Kogyo Seiyaku Co Ltd | Method for packaging ethylene oxide-butylene oxide copolymer resin and packaging material used for it |
| CN101765488B (en) * | 2007-08-21 | 2016-05-25 | 株式会社日本触媒 | The manufacture method of acrylic resin pellet and the manufacture method of film |
| JP6807182B2 (en) * | 2015-07-24 | 2021-01-06 | 旭化成株式会社 | Package of polycarbonate diol, storage method and transportation method |
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| JP2002128885A (en) | 2002-05-09 |
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