JPH0548162B2 - - Google Patents
Info
- Publication number
- JPH0548162B2 JPH0548162B2 JP59041631A JP4163184A JPH0548162B2 JP H0548162 B2 JPH0548162 B2 JP H0548162B2 JP 59041631 A JP59041631 A JP 59041631A JP 4163184 A JP4163184 A JP 4163184A JP H0548162 B2 JPH0548162 B2 JP H0548162B2
- Authority
- JP
- Japan
- Prior art keywords
- polycarbonate resin
- water
- weight
- hopper
- pellets
- 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.)
- Expired - Fee Related
Links
- 229920005668 polycarbonate resin Polymers 0.000 claims description 28
- 239000004431 polycarbonate resin Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229920005989 resin Polymers 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 239000008188 pellet Substances 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000012778 molding material Substances 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 21
- 239000000126 substance Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000004040 coloring Methods 0.000 description 5
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 4
- 241001550224 Apha Species 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012696 Interfacial polycondensation Methods 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- CLBRCZAHAHECKY-UHFFFAOYSA-N [Co].[Pt] Chemical compound [Co].[Pt] CLBRCZAHAHECKY-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
本発明は透明性などの光学特性の優れたポリカ
ーボネート樹脂成形材料の製法並びにそれを用い
た透明な光学用ポリカーボネート樹脂成形品の製
法に関する。
光記録デイスク、ビデオデイスク、コンパクト
デイスク等の光学用の用途においては、透明性、
成形性（転写性を含む）、低複屈折、離型性、耐
湿性（特に吸湿による反り）、異物混入等の面で
従来の成形材料とは格段の高性能化が要求され
る。
ポリカーボネート樹脂は透明で、寸法安定性に
優れ、吸湿による反りも少ないため、コンパクト
デイスク等の材料としては最も適合した材料であ
るが、ポリカーボネート樹脂は溶融粘度が高いた
め、通常の成形条件では、薄い円板状の成形品が
得られなかつたり、得られても成形品の複屈折が
大きくなるなどの欠点が生じる。
樹脂の溶融粘度を低下させるため、通常のポリ
カーボネート樹脂の成形温度である270〜300℃の
温度を超えて、例えば330〜380℃での成形が考え
られるが、このような高温ではポリカーボネート
樹脂の熱分解等による黄色乃至黄褐色の成形品着
色、及び成形品中に褐色乃至黒褐色の塩化メチレ
ン（ポリカーボネート樹脂の良溶媒）に不溶解性
のゴミ状物質が点在するという現象が見られる。
光学部品などの材料において、異物の混入はそ
の性能上極めて重大な問題である。外部からの異
物の混入は製造、保存その他の環境を無塵化する
ことによつて容易に解決出来るものであるが、成
形時などに於ける材料の劣化に基づく異物の生成
の解消除去は、材料そのものの劣化の防止以外に
方法はないものであり、致命的な問題であつた。
本発明者らは、上記の欠点の発生原因について
380℃、窒素気流下の試験管による溶融試験によ
る再現を試みた。その結果、ガラス製の試験管で
は樹脂の黄色乃至黄褐色の着色現象は見られるも
のの、樹脂中に褐色乃至黒褐色の塩化メチレン
（ポリカーボネート樹脂の良溶媒）に不溶解性の
ゴミ状物質の生成は見られないものであり、押出
機等に多く用いられているSUS316製の200メツ
シユ金網の小片を試験管に入れた場合に認められ
た。さらに、金網の小片を試験管に入れた場合、
試験に用いる樹脂の色相にかかわらず生成するゴ
ミ状物質の大きさ及び量ともに略同程度であつ
た。又、前記のガラス製の試験管試験において、
窒素中に少量（約１％程度）の酸素を混入する
と、着色現象の著しい促進が見られた。
以上の試験結果から、本発明者らは、ポリカー
ボネート樹脂の高温劣化には、高温による着色
現象として無酸素状態下で現れる劣化、前記着
色現象の酸素による大幅な促進、及び高温下で
金属すなわち成形機内部の金属面とのなんらかの
作用による褐色乃至黒褐色の塩化メチレンに不溶
解性のゴミ状物質の生成する劣化との三種のもの
があるものと推定した。
本発明者らは、以上の欠点、特に塩化メチレン
不溶性のゴミ状物質の生成の解消について種々の
側面から鋭意検討した結果、窒素気流中での溶融
処理において、金網の小片の存在下においても樹
脂の着色はあるものの塩化メチレン不溶のゴミ状
物質は殆ど生成しないペレツトの製法を見いだ
し、本発明に到達した。
すなわち、本発明は、ポリカーボネート樹脂粉
体をベント付きスクリユー押出機により押出して
ペレツトを製造する方法において、該ポリカーボ
ネート樹脂粉体として予め0.1〜５重量％の水を
含ませたものを用いるか、または該押出機のホツ
パー内に、押出し樹脂重量の0.1〜５重量％とな
るような量の水を供給しつつ溶融押出することを
特徴とするポリカーボネート樹脂成形材料の製法
であり、好ましい実施態様においては該水とし
て、導電率が10μS／cm以下、特に好ましくは
1μS／cm以下の純水を用いるものである。又、前
記の方法で得たペレツトを乾燥した後、乾燥した
該ペレツトを、ホツパーに乾燥窒素を供給してい
る成形機のホツパーに投入し成形することを特徴
とする透明な光学用ポリカーボネート樹脂品の製
法である。
以下、本発明について説明する。
本発明のポリカーボネート樹脂粉体としては、
通常のものでもよいが、光学材料とする場合に
は、ポリカーボネート樹脂の合成原料〜製造・保
存等の環境を無塵化して得たものを用いるのが良
い。
本発明の水としては、導電率が10μS／cm以下、
特に好ましくは1μS／cm以下の純水を用いる。導
電率の高い水は多くの場合、無機の塩類を含むも
のであり、このような無機塩類が成形材料中に混
入した場合には、光の乱反射による成形品の光線
透過率の低下を起こし、透明性が損なわれる。
又、水は、押出し樹脂粉体中に予め0.1〜５重
量％の水を含ませるか若しくは押出し樹脂重量の
0.1〜５重量％となるような量の水を押出機のホ
ツパー内、好ましくはスクリユーに出来るだけ近
い部分に供給する方法による。押出時のホツパー
内に供給された水がスクリユー部にスムーズに供
給されない場合にはバラツキを生じ定常的な押出
が困難となるなどの不都合を生じ易い。使用量が
0.1重量％未満では、本発明の安定化の効果が薄
く、又、５重量％を超えると樹脂粉体のスクリユ
ーへの食い込みが悪くなり押出樹脂量が減少する
ので好ましくない。
本発明の押出方法は、以上の水を使用すること
に特徴を有するものであり、その他は従来法と同
様で良いものである。又、水の使用によつてポリ
カーボネート樹脂成形材料の安定性が大幅に向上
すること、さらに本発明の方法によつて得られた
ポリカーボネート樹脂ペレツトの粘度平均分子量
と押出機ホツパーに供給されるポリカーボネート
樹脂粉体の粘度平均分子量とが殆ど同一であるこ
とは、通常、ポリカーボネート樹脂がエステルで
あり、例えば、射出成形に於いて乾燥不十分のペ
レツトを使用した場合に大幅な物性及び分子量の
劣化を生じること等の当業者の常識から考え予想
外のことである。
本発明の好ましい成形方法においては、成形時
にホツパーに挿入する乾燥窒素としては純度99.9
％以上、好ましくは99.99％以上であり、好まし
くはスクリユーに出来るだけ近い部分に挿入する
方法による。
以上の如くである本発明の方法によるポリカー
ボネート樹脂成形材料は、熱安定性に優れたもの
であり、成形時にゴミ状物質を実質的に生成しな
いものであるので、光学材料に適するものである
ことは無論のこと、一般の成形材料においても、
ゴミ状物質等による欠陥が大幅に減少したものと
なるため、より安定した物性の成形品を得ること
が可能である。又、本発明の成形方法によれば、
高温着色も大幅に減少するので光記録デイスク、
ビデオデイスク、コンパクトデイスク等の光学用
の用途用の成形に好適である。
以下、実施例により本発明を説明する。
実施例 １
ペレツトの塩化メチレン不溶性物質の生成比較
２，２−ビス（４−ヒドロキシフエニル）プロ
パン（以下、ビスフエノールＡという）とホスゲ
ンとを界面重縮合反応させることによつて得た二
種類の粘度平均分子量約1.8×104及び2.3×104の
ポリカーボネート樹脂粉体（以下、Ａ，Ｂとい
う）を40mmφスクリユー押出機を用いて溶融押出
し、約２mm角の立方体ペレツトとした。
この押出の際、導電率が10μS／cmより小さい
純水を樹脂量に対して２重量％となるように混入
したもの（以下、Ａ１，Ｂ１という）、および水
を使用しないもの（以下、Ａ２，Ｂ２という）の
計４種類のペレツトとした。
上記の４種類のペレツト各４ｇを、ガラス製試
験管とガラス製試験管にSUS316製200メツシユ
金網をいれたものとに入れ、120℃で６時間熱風
循環乾燥機で乾燥し、さらに120℃で乾燥窒素を
１時間吹き込み試験管内部を窒素置換し、直ちに
乾燥窒素を吹き込んでいる380℃に保つた電気炉
に入れ、１時間保つたのち、室温まで冷却した。
試験管を破壊し、内部の樹脂を取り出し、25mlの
塩化メチレンに撹拌などの操作をせず溶解して樹
脂液とした。
樹脂液を底の平坦なシヤーレに全量移し、目視
によつて、それぞれの試料の塩化メチレン不溶性
ゴミ状物質の大きさと数とを測定した。
又、樹脂液をガラスフイルターで濾過しながら
10mmφの比色管に入れ、同じ液高の白金コバルト
色度標準液の色と目視比較して樹脂液の色
（APHA）を測定した。その後で樹脂液を塩化メ
チレンで５倍に希釈し、５ミクロンのメンブラン
フイルターで濾過し、顕微鏡により微少なゴミ状
物質の大きさと数とを測定した。
結果を第１表に示した。
実施例 ２
実施例１において、水を予め樹脂粉体に混入せ
ず、スクリユー押出機のホツパー口で出来るだけ
スクリユーに近い部分に導管を差込み、プランジ
ヤータイプの化学定量ポンプで、導電率10μS／
cmより小さい純水を樹脂押出量に対して２重量％
となるように注入してペレツトを得る他は同様と
した。ガラス製試験管にSUS316製200メツシユ
金網をいれたものの塩化メチレン不溶性ゴミ状物
質は実施例１と同様殆ど認められなかつた。
実施例 ３
実施例１において、２重量％の水を用いて得た
ペレツトを、成形機のホツパー内の出来るだけス
クリユーに近い部分に１／分で乾燥窒素を供給
しているホツパーに投入し、樹脂温度360℃で射
出成形し、厚み３mmで直径10cmの円板状成形品を
得た。
この成形品より４ｇの小片を切取り、実施例１
と同様にAPHAを測定したところ60であつた。
尚、乾燥窒素を供給せずに成形したものの
APHAは80であつた。
又、いずれの場合にも、目式観察に依つては塩
化メチレン不溶性物質は認められなかつた。
The present invention relates to a method for producing a polycarbonate resin molding material having excellent optical properties such as transparency, and a method for producing a transparent optical polycarbonate resin molded article using the same. In optical applications such as optical recording discs, video discs, and compact discs, transparency,
It is required to have much higher performance than conventional molding materials in terms of moldability (including transferability), low birefringence, mold releasability, moisture resistance (especially warping due to moisture absorption), and prevention of foreign matter contamination. Polycarbonate resin is transparent, has excellent dimensional stability, and is less likely to warp due to moisture absorption, so it is the most suitable material for compact discs, etc. However, due to the high melt viscosity of polycarbonate resin, under normal molding conditions, it is difficult to make thin Disc-shaped molded products may not be obtained, or even if they are obtained, the molded product has disadvantages such as increased birefringence. In order to reduce the melt viscosity of the resin, it is possible to mold the resin at a temperature higher than the usual molding temperature of 270 to 300 degrees Celsius, for example 330 to 380 degrees Celsius, but at such high temperatures the heat of the polycarbonate resin There are phenomena in which the molded product is colored yellow to yellowish brown due to decomposition, and the molded product is dotted with brown to blackish brown dust-like substances that are insoluble in methylene chloride (a good solvent for polycarbonate resin). Contamination of foreign substances in materials such as optical parts is an extremely serious problem in terms of performance. Contamination of foreign matter from the outside can be easily resolved by making the manufacturing, storage, and other environments dust-free, but eliminating and removing foreign matter caused by material deterioration during molding, etc. This was a fatal problem, as there was no other way than to prevent deterioration of the material itself. The inventors have investigated the causes of the above drawbacks.
We attempted to reproduce this by conducting a melting test in a test tube at 380℃ under a nitrogen stream. As a result, although yellow to yellowish brown coloring of the resin was observed in glass test tubes, the formation of brown to blackish brown dust-like substances in the resin that was insoluble in methylene chloride (a good solvent for polycarbonate resin) was not observed. However, it was observed when a small piece of 200-mesh wire mesh made of SUS316, which is often used in extruders, was placed in a test tube. Furthermore, if a small piece of wire mesh is placed in a test tube,
Regardless of the hue of the resin used in the test, the size and amount of the generated dust-like substances were approximately the same. In addition, in the glass test tube test mentioned above,
When a small amount (approximately 1%) of oxygen was mixed into nitrogen, the coloring phenomenon was significantly accelerated. From the above test results, the present inventors have concluded that the high-temperature deterioration of polycarbonate resin includes: degradation that appears under anoxic conditions as a coloring phenomenon due to high temperatures, significant acceleration of the coloring phenomenon by oxygen, and metal or molding under high temperatures. It is assumed that there are three types of deterioration: one is the formation of dust-like substances that are insoluble in methylene chloride, which is brown to blackish brown due to some kind of interaction with the metal surfaces inside the machine. The inventors of the present invention have conducted intensive studies from various aspects to resolve the above-mentioned drawbacks, particularly the generation of dust-like substances insoluble in methylene chloride. As a result, the inventors have found that, in melting treatment in a nitrogen stream, even in the presence of small pieces of wire mesh, the resin The present invention was achieved by discovering a method for producing pellets that produces almost no trash-like substances insoluble in methylene chloride, although the pellets are colored. That is, the present invention provides a method for producing pellets by extruding polycarbonate resin powder using a vented screw extruder, in which the polycarbonate resin powder is pre-impregnated with 0.1 to 5% by weight of water, or A method for producing a polycarbonate resin molding material, which is characterized by melt extrusion while supplying water in an amount of 0.1 to 5% by weight of the extruded resin into the hopper of the extruder, and in a preferred embodiment, The water has an electrical conductivity of 10 μS/cm or less, particularly preferably
It uses pure water of 1μS/cm or less. Also, a transparent optical polycarbonate resin product characterized in that after drying the pellets obtained by the above method, the dried pellets are charged into a hopper of a molding machine whose hopper is supplied with dry nitrogen and molded. This is the manufacturing method. The present invention will be explained below. The polycarbonate resin powder of the present invention includes:
Ordinary materials may be used, but when used as an optical material, it is preferable to use materials obtained by making the environment from the synthetic raw material for polycarbonate resin to manufacturing and storage dust-free. The water of the present invention has an electrical conductivity of 10 μS/cm or less,
Particularly preferably, pure water of 1 μS/cm or less is used. Water with high conductivity often contains inorganic salts, and if such inorganic salts are mixed into the molding material, the light transmittance of the molded product will decrease due to diffuse reflection of light. Transparency is compromised. In addition, water can be prepared by pre-containing 0.1 to 5% of water in the extruded resin powder or by adding 0.1 to 5% by weight of water to the extruded resin powder
A method is used in which water is supplied in an amount of 0.1 to 5% by weight into the hopper of the extruder, preferably as close as possible to the screw. If the water supplied into the hopper during extrusion is not smoothly supplied to the screw part, it tends to cause inconveniences such as fluctuations and steady extrusion becoming difficult. usage amount
If it is less than 0.1% by weight, the stabilizing effect of the present invention will be weak, and if it exceeds 5% by weight, the resin powder will not penetrate into the screws and the amount of extruded resin will decrease, which is not preferable. The extrusion method of the present invention is characterized by the use of water as described above, and other aspects may be the same as conventional methods. Furthermore, the stability of the polycarbonate resin molding material is greatly improved by the use of water, and the viscosity average molecular weight of the polycarbonate resin pellets obtained by the method of the present invention and the polycarbonate resin fed to the extruder hopper are further improved. The fact that the viscosity average molecular weight of the powder is almost the same means that the polycarbonate resin is usually an ester, and for example, if insufficiently dried pellets are used in injection molding, the physical properties and molecular weight will significantly deteriorate. This is unexpected considering the common sense of those skilled in the art. In the preferred molding method of the present invention, the dry nitrogen inserted into the hopper during molding has a purity of 99.9
% or more, preferably 99.99% or more, preferably by a method of inserting it as close to the screw as possible. The polycarbonate resin molding material produced by the method of the present invention as described above has excellent thermal stability and does not substantially generate dust during molding, so it is suitable for optical materials. Of course, in general molding materials,
Since defects caused by dust-like substances and the like are significantly reduced, it is possible to obtain a molded product with more stable physical properties. Moreover, according to the molding method of the present invention,
High-temperature coloring is also greatly reduced, so optical recording disks,
Suitable for molding for optical applications such as video discs and compact discs. The present invention will be explained below with reference to Examples. Example 1 Comparison of production of methylene chloride-insoluble substances in pellets Two types obtained by interfacial polycondensation reaction of 2,2-bis(4-hydroxyphenyl)propane (hereinafter referred to as bisphenol A) and phosgene Polycarbonate resin powders (hereinafter referred to as A and B) having viscosity average molecular weights of approximately 1.8×10 4 and 2.3×10 4 were melt-extruded using a 40 mmφ screw extruder to form cubic pellets of approximately 2 mm square. During this extrusion, there are two types in which pure water with a conductivity of less than 10 μS/cm is mixed in at a rate of 2% by weight based on the amount of resin (hereinafter referred to as A1 and B1), and one in which water is not used (hereinafter referred to as A2). , B2). 4g of each of the above four types of pellets were put into a glass test tube and a glass test tube with a 200 mesh wire mesh made of SUS316, dried in a hot air circulation dryer at 120℃ for 6 hours, and then further heated at 120℃. The inside of the test tube was replaced with nitrogen by blowing dry nitrogen for 1 hour, and immediately placed in an electric furnace maintained at 380°C into which dry nitrogen was blown, and after being kept for 1 hour, it was cooled to room temperature.
The test tube was destroyed, the resin inside was taken out, and dissolved in 25 ml of methylene chloride without stirring or other operations to obtain a resin liquid. The entire amount of the resin liquid was transferred to a flat-bottomed shear dish, and the size and number of methylene chloride-insoluble dust-like substances in each sample were visually measured. Also, while filtering the resin liquid with a glass filter,
The color (APHA) of the resin liquid was measured by placing it in a 10 mmφ colorimetric tube and visually comparing the color with a platinum cobalt chromaticity standard solution of the same liquid height. Thereafter, the resin liquid was diluted five times with methylene chloride, filtered through a 5 micron membrane filter, and the size and number of minute dust-like substances were measured using a microscope. The results are shown in Table 1. Example 2 In Example 1, without mixing water into the resin powder in advance, a conduit was inserted into the hopper opening of the screw extruder as close to the screw as possible, and a plunger-type chemical metering pump was used to increase the conductivity to 10 μS/
2% by weight of pure water smaller than cm based on resin extrusion amount
The procedure was the same except that pellets were obtained by injecting the pellets so that Although a 200-mesh wire mesh made of SUS316 was placed in a glass test tube, almost no methylene chloride-insoluble dust-like substances were observed as in Example 1. Example 3 In Example 1, the pellets obtained using 2% by weight of water were put into a hopper of a molding machine in which dry nitrogen was being supplied at a rate of 1/min to a part of the hopper as close to the screw as possible, Injection molding was performed at a resin temperature of 360°C to obtain a disc-shaped molded product with a thickness of 3 mm and a diameter of 10 cm. Example 1 A small piece of 4 g was cut out from this molded product.
When I measured APHA in the same way as above, it was 60.
In addition, although the molding was performed without supplying dry nitrogen,
APHA was 80. In any case, no methylene chloride-insoluble substances were observed by visual observation.
【表】【table】
Claims (1)
リユー押出機により溶融押出してペレツトを製造
する方法において、該ポリカーボネート樹脂粉体
として予め0.1〜５重量％の水を含ませたものを
用いるか、または該押出機のホツパー内に、押出
し樹脂重量の0.1〜５重量％となるような量の水
を供給しつつ溶融押出することを特徴とするポリ
カーボネート樹脂成形材料の製法。 ２ 該水として、導電率が10μS／cm以下の純水
を用いる特許請求の範囲第１項記載のポリカーボ
ネート樹脂成形材料の製法。 ３ ポリカーボネート樹脂粉体をベント付きスク
リユー押出機により溶融押出してペレツトを製造
する方法において、該ポリカーボネート樹脂粉体
として予め0.1〜５重量％の水を含ませたものを
用いるか、または該押出機のホツパー内に、押出
し樹脂重量の0.1〜５重量％となるような量の水
を供給しつつ溶融押出して得たペレツトを乾燥し
た後、乾燥した該ペレツトをホツパーに乾燥窒素
を供給している成形機のホツパーに投入し成形す
ることを特徴とする透明な光学用ポリカーボネー
ト樹脂成形品の製法。 ４ 該水として、導電率が10μS／cm以下の純水
を用いる特許請求の範囲第３項記載のポリカーボ
ネート樹脂成形品の製法。[Claims] 1. In a method for producing pellets by melt-extruding polycarbonate resin powder using a vented screw extruder, the polycarbonate resin powder may be pre-impregnated with 0.1 to 5% by weight of water. , or a method for producing a polycarbonate resin molding material, characterized in that melt extrusion is carried out while supplying water in an amount of 0.1 to 5% by weight of the extruded resin into the hopper of the extruder. 2. The method for producing a polycarbonate resin molding material according to claim 1, in which pure water having an electrical conductivity of 10 μS/cm or less is used as the water. 3. In the method of producing pellets by melt-extruding polycarbonate resin powder using a vented screw extruder, the polycarbonate resin powder is pre-impregnated with 0.1 to 5% by weight of water, or the extruder is After drying the pellets obtained by melt extrusion while supplying water in an amount of 0.1 to 5% by weight of the extruded resin weight into the hopper, the dried pellets are molded by supplying dry nitrogen to the hopper. A method for manufacturing transparent optical polycarbonate resin molded products, which is characterized by casting them into the hopper of a machine and molding them. 4. The method for producing a polycarbonate resin molded article according to claim 3, wherein the water is pure water having an electrical conductivity of 10 μS/cm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041631A JPS60184814A (en) | 1984-03-05 | 1984-03-05 | Manufacture of polycarbonate resin molding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041631A JPS60184814A (en) | 1984-03-05 | 1984-03-05 | Manufacture of polycarbonate resin molding material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60184814A JPS60184814A (en) | 1985-09-20 |
| JPH0548162B2 true JPH0548162B2 (en) | 1993-07-20 |
Family
ID=12613674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59041631A Granted JPS60184814A (en) | 1984-03-05 | 1984-03-05 | Manufacture of polycarbonate resin molding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60184814A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009060967A1 (en) | 2007-11-06 | 2009-05-14 | Teijin Chemicals Ltd. | Process for producing polycarbonate resin pellet and molded article |
| WO2017086209A1 (en) * | 2015-11-20 | 2017-05-26 | 出光興産株式会社 | Method of manufacturing polycarbonate resin pellets |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61221225A (en) * | 1985-03-28 | 1986-10-01 | Idemitsu Petrochem Co Ltd | Production of molding polycarbonate resin |
| JPH02135222A (en) * | 1988-11-17 | 1990-05-24 | Teijin Chem Ltd | Polycarbonate formed product |
| DE19537114C2 (en) * | 1995-10-05 | 1998-11-12 | Bayer Ag | Process for drying polymer powders and agglomerates |
| ES2230579T3 (en) * | 1997-07-15 | 2005-05-01 | Asahi Kasei Chemicals Corporation | METHOD TO PRODUCE A POLYCARBONATE GRANLE. |
| DE19952852A1 (en) | 1999-11-03 | 2001-05-10 | Bayer Ag | High-purity polymer granules and process for their production |
| US6833427B2 (en) | 2001-05-18 | 2004-12-21 | Teijin Chemicals, Ltd. | Polycarbonate resin molding material for optical use |
-
1984
- 1984-03-05 JP JP59041631A patent/JPS60184814A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009060967A1 (en) | 2007-11-06 | 2009-05-14 | Teijin Chemicals Ltd. | Process for producing polycarbonate resin pellet and molded article |
| WO2017086209A1 (en) * | 2015-11-20 | 2017-05-26 | 出光興産株式会社 | Method of manufacturing polycarbonate resin pellets |
| JPWO2017086209A1 (en) * | 2015-11-20 | 2018-09-06 | 出光興産株式会社 | Method for producing polycarbonate resin pellets |
| US11208552B2 (en) | 2015-11-20 | 2021-12-28 | Idemitsu Kosan Co., Ltd. | Method of manufacturing polycarbonate resin pellets |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60184814A (en) | 1985-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1056985A (en) | Polyesters for extrusion applications | |
| KR100209864B1 (en) | Carbodiimide-modified polyester fiber and preparation thereof | |
| US5292587A (en) | Material for extrusion molding and process for preparation of molding product | |
| JPS60240731A (en) | Novel resin material, its production and use | |
| JPH0548162B2 (en) | ||
| JP3403867B2 (en) | Infrared transmitting resin composition, infrared transmitting filter formed from this resin composition | |
| US4273899A (en) | Fire-retardant thermoplastic polyester composition | |
| US4464487A (en) | Process for preparing additive concentrates for carbonate polymers | |
| US4129536A (en) | Vinyl chloride based injection molding composition | |
| JPS60184813A (en) | Manufacture of polycarbonate resin molding material for disc body | |
| TW402614B (en) | Polycarbonate pellet and method for producing the same | |
| US3367958A (en) | Stabilized polycarbonates | |
| JPWO2019189328A1 (en) | Resin composition and filament-shaped molded article made of the same | |
| US4014849A (en) | Self-extinguishing reinforced polycarbonate molding compositions | |
| JPH09279045A (en) | Thermoplastic resin molding containing silicone oil and excellent in surface appearance | |
| JP3442556B2 (en) | Aromatic polycarbonate resin and method for producing the same | |
| EP1651702B1 (en) | Polyformals and copolyformals with reduced water absorption, production and use thereof | |
| JPS6220533A (en) | Production of polycarbonate molded product filled with carbon black | |
| US3431230A (en) | Antiplasticized polysulfone ethers | |
| JPH0341802B2 (en) | ||
| ES2230579T3 (en) | METHOD TO PRODUCE A POLYCARBONATE GRANLE. | |
| CN112852128A (en) | Composition for 3D printing, 3D printed product and preparation method thereof | |
| US5928586A (en) | Melt extrusion processing method of thermoplastic resin | |
| JP3885834B2 (en) | Production method of transparent polycarbonate resin molding material | |
| US4012358A (en) | Pigmenting fiber grade polyester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |