WO2000009582A1 - Polycarbonate de grande purete et procede de fabrication associe - Google Patents

Polycarbonate de grande purete et procede de fabrication associe Download PDF

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Publication number
WO2000009582A1
WO2000009582A1 PCT/EP1999/005451 EP9905451W WO0009582A1 WO 2000009582 A1 WO2000009582 A1 WO 2000009582A1 EP 9905451 W EP9905451 W EP 9905451W WO 0009582 A1 WO0009582 A1 WO 0009582A1
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WO
WIPO (PCT)
Prior art keywords
polycarbonate
solution
shaped body
less
washing liquid
Prior art date
Application number
PCT/EP1999/005451
Other languages
German (de)
English (en)
Inventor
Christian Kords
Jürgen HEUSER
Thomas Elsner
Original Assignee
Bayer Aktiengesellschaft
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
Priority claimed from DE1998136664 external-priority patent/DE19836664A1/de
Priority claimed from DE1998147051 external-priority patent/DE19847051A1/de
Application filed by Bayer Aktiengesellschaft filed Critical Bayer Aktiengesellschaft
Priority to EP99938379A priority Critical patent/EP1105432A1/fr
Priority to AU52896/99A priority patent/AU5289699A/en
Priority to BR9913005-0A priority patent/BR9913005A/pt
Priority to JP2000565024A priority patent/JP2002522605A/ja
Priority to KR1020017001800A priority patent/KR20010079634A/ko
Publication of WO2000009582A1 publication Critical patent/WO2000009582A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/40—Post-polymerisation treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/40—Post-polymerisation treatment
    • C08G64/406—Purifying; Drying

Definitions

  • the invention relates to a polycarbonate of the highest purity, moldings made from this polycarbonate and a method for producing the high-purity polycarbonate or the cleaning of polycarbonate.
  • Molded articles made of polycarbonates with high purity are used for optical and magneto-optical purposes, in particular in laser-readable data storage media. Since the storage capacity of these media is to be continuously increased, the requirements for the purity of the polycarbonates used also increase.
  • dihydroxydiarylalkanes in the form of their alkali metal salts are reacted with phosgene in the heterogeneous phase in the presence of inorganic bases such as sodium hydroxide solution and an organic solvent in which the product polycarbonate is readily soluble.
  • inorganic bases such as sodium hydroxide solution and an organic solvent in which the product polycarbonate is readily soluble.
  • the aqueous phase is distributed in the organic phase and after the reaction the organic polycarbonate-containing phase is washed with an aqueous liquid, which is intended, among other things, to remove electrolytes, and the washing liquid is then separated off.
  • EP 264 885 A2 proposes to stir the aqueous washing liquid with the polycarbonate solution and to separate the aqueous phase by centrifugation.
  • EP 379 130 AI describes an optical storage medium which was produced using a polycarbonate with a low proportion of foreign particles.
  • the foreign particle index is used to describe the purity of the polycarbonate, the polycarbonate used here for producing the storage medium having a foreign particle index of 1 ⁇ 10 5 ⁇ m 2 / g. So a polycarbonate this purity is obtained, EP 379 130 A1 suggests filtering the polycarbonate solution or washing the polycarbonate granules with warming with acetone.
  • EP 380 002 A2 discloses an optical storage medium which has been produced using a polycarbonate, the content of metals of group IA and
  • EP 417 775 A2 made from polycarbonate contains a residual sodium content of not more than 1 ppm in its polycarbonate portion.
  • the invention has for its object to provide polycarbonates and copolycarbonates with an even greater purity with respect to the sodium content and / or the particle content, which for the production of moldings, in particular optical moldings, magneto-optical and optical data storage with a particularly high
  • the polymers according to the invention are characterized by a sodium content of less than 50 ppb, preferably ⁇ 30 ppb, as measured by atomic absorption spectroscopy.
  • the invention further relates to a method for producing these polymers.
  • the invention also relates to a process for cleaning the polymer-containing ones
  • Solution of particles and alkali salts, in particular sodium salts in which the organic phase containing the polymer and washed with a washing liquid heated to obtain a clear solution and filtered to remove solids.
  • the polymers according to the invention are polycarbonates, both homopolycarbonates and copolycarbonates and mixtures thereof.
  • the polycarbonates according to the invention can be aromatic polyester carbonates or polycarbonates which are present in a mixture with aromatic polyester carbonates.
  • the term polycarbonate is then used to represent the aforementioned polymers.
  • the polycarbonate according to the invention is obtained by the so-called phase boundary process (H. Schnell "Chemistry and Physics of Polycarbonates", Polymer Review, Vol. IX p.33ff, Interscience Publishers, New York 1964), in which the solution containing polycarbonate is then washed with a washing liquid, the washing liquid is separated off and the solvent is evaporated off According to the invention, this process is modified in such a way that the mixture of organic solution and residual aqueous washing liquid obtained after the washing step is heated until a clear solution is obtained and filtered to remove solids.
  • washing process still inorganic salts and residues of the washing liquid, especially water.
  • the remaining washing liquid can be emulsified and / or dissolved in the organic phase, but can also be present as a pure aqueous phase.
  • the known washing stage does not completely separate the electrolytes from the polycarbonate solution.
  • the remaining electrolytes, especially alkali salts are dissolved in the aqueous phase after the washing process. After evaporation of the solvent and recovery of the polycarbonate, these remain as contaminating particles in the polycarbonate. Only through the intermediate filtration according to the invention at elevated temperature is the separation of residual electrolyte particles from the polycarbonate solution achieved.
  • the temperature of the polycarbonate solution obtained after washing will usually be 25 to 40 ° C., the polycarbonate solution having a milky, cloudy appearance.
  • the temperature required to obtain a clear solution depends on the water content in the polycarbonate solution. In the usual procedure, a temperature increase of 5 to 35 ° C will suffice. A temperature increase of more than 35 ° C may be necessary with larger amounts of water.
  • Membrane filters and sintered metal filters are suitable as filter media for carrying out the filtration according to the invention.
  • the pore size of the filter materials is preferably 0.1 to 1.5 ⁇ m, for example approximately 0.6 ⁇ m or approximately 1.0 ⁇ m.
  • Such filter materials are commercially available, for example, from Pall GmbH, D-
  • the intermediate filtration according to the invention at elevated temperature results in a particle reduction of more than 40%, based on the number of particles of a comparison sample of the same production batch that was not filtered.
  • Compounds to be used preferably as starting compounds according to the invention are bisphenols of the general formula HO-Z-OH, in which Z is a divalent organic radical having 6 to 30 carbon atoms and containing one or more aromatic groups.
  • Z is a divalent organic radical having 6 to 30 carbon atoms and containing one or more aromatic groups.
  • Examples of such compounds are bisphenols which belong to the group of dihydroxydiphenyls, bis (hydroxyphenyl) alkanes, inganbisphenols, bis (hydroxy) phenyl) ether, bis (hydroxyphenyl) sulfones, bis (hydroxyphenyl) ketones and a, a'-bis (hydroxyphenyl) diisopropylbenzenes.
  • Particularly preferred bisphenols which belong to the abovementioned connecting groups are 2,2-bis (4-hydroxyphenyl) propane (bisphenol-A), tetraalkylbisphenol-A, 4,4- (meta-phenylenediisopropyl) diphenol (bisphenol M ), l, l-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexanone and optionally their mixtures.
  • Particularly preferred copolycarbonates are those based on the monomers bisphenol-A and l, l-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane.
  • the bisphenol compounds to be used according to the invention are reacted with carbonic acid compounds, in particular phosgene.
  • the polyester carbonates according to the invention are obtained by reacting the bisphenols already mentioned, at least one aromatic dicarboxylic acid and optionally carbonic acid.
  • aromatic dicarboxylic acids are, for example, orthophthalic acid, terephthalic acid, isophthalic acid, 3,3'- or 4,4'-diphenyldicarboxylic acid and benzophenone dicarboxylic acids.
  • Inert organic solvents used in the process are, for example, dichloromethane, the various dichloroethanes and chloropropane compounds,
  • Chlorobenzene and chlorotoluene preferably dichloromethane and mixtures of dichloromethane and chlorobenzene are used.
  • the reaction can be accelerated by catalysts such as tertiary amines, N-alkylpiperidines or onium salts.
  • catalysts such as tertiary amines, N-alkylpiperidines or onium salts.
  • N-ethylpiperidine used.
  • a monofunctional phenol such as phenol, cumylphenol, p.-tert.-butylphenol or 4- (1,1,3,3-tetramethylbutyl) phenol can be used as chain terminator and molecular weight regulator.
  • isatin biscresol can be used as branching agent.
  • the bisphenols are dissolved in an aqueous alkaline phase, preferably sodium hydroxide solution.
  • the chain terminators which may be required for the production of copolycarbonates are dissolved in amounts of 1.0 to 20.0 mol% per mole of bisphenol, in the aqueous alkaline phase or in an inert organic phase
  • Some, up to 80 mol%, preferably from 20 to 50 mol%, of the carbonate groups in the polycarbonates can be replaced by aromatic dicarboxylic acid ester groups.
  • thermoplastic polycarbonates have average molecular weights M "(determined by measuring the relative viscosity at 25 ° C. in dichloromethane and a concentration of 0.5 g polycarbonate / 100 ml dichloromethane) from 12,000 to
  • the aqueous phase is emulsified in the organic phase. This creates droplets of different sizes.
  • the organic phase containing the polycarbonate is usually washed several times with an aqueous liquid and separated from the aqueous phase as far as possible after each washing operation.
  • the polymer solution is cloudy after washing and separating the washing liquid.
  • Aqueous liquid for separating the catalyst a dilute mineral acid such as HC1 or
  • the concentration of HC1 or H, PO 4 in the washing liquid can be, for example, 0.5 to 1.0% by weight.
  • the organic phase can be washed five times, for example, and after the last washing liquid has been separated off, the inventive filtration described above is carried out at elevated temperature.
  • known separation vessels, phase separators, centrifuges or coalescers or combinations of these devices can be used as phase separation devices for separating the washing liquid from the organic phase.
  • the solvent is evaporated to obtain the high-purity polycarbonate. Evaporation can take place in several evaporator stages. According to a further preferred embodiment of this invention, the solvent or part of the solvent can be removed by spray drying. The high-purity polycarbonate is then obtained as a powder. The same applies to the extraction of high purity
  • Moldings according to the invention made of high-purity polycarbonate are, in particular, optical and magneto-optical data storage devices such as mini disks, compact disks or digital versatile disks, optical lenses and prisms, glazing for motor vehicles and headlights, glazing of other types such as for greenhouses, so-called double-wall sheets or hollow-chamber sheets.
  • optical and magneto-optical data storage devices such as mini disks, compact disks or digital versatile disks, optical lenses and prisms, glazing for motor vehicles and headlights, glazing of other types such as for greenhouses, so-called double-wall sheets or hollow-chamber sheets.
  • the preferred molecular weight range for the data carriers is 12,000 to 22,000, for lenses and panes 22,000 to 32,000 and that of plates and twin-walled plates 28,000 to 40,000. All molecular weight data relate to the weight average of the molecular weight.
  • the moldings according to the invention may have a surface finish, for example a scratch-resistant coating.
  • the polycarbonates according to the invention are preferably stored with a data carrier Molecular weight of 12,000 to 40,000 used because a material with a molecular weight in this area can be molded very well thermoplastic.
  • the moldings can be produced by injection molding. For this purpose, the resin is melted at temperatures of 300 to 400 ° C. and the mold is generally kept at a temperature of 50 to 140 ° C. Shaped articles produced using the high-purity polycarbonate obtained according to the invention are shown in FIGS. 1 and 2.
  • FIG. 1 shows the schematic structure of a compact disk, 1 denoting a polycarbonate molded body according to the invention.
  • the thickness of the polycarbonate molded body is, for example, approximately 1.2 mm.
  • the information is stored in the form of indentations in the molded polycarbonate body.
  • the surface of the molded polycarbonate body having the depressions is provided with an aluminum layer 2, on which a protective layer 3 is formed from a lacquer.
  • FIG. 2 shows the schematic structure of a digital versatile disk (DVD) with two molded polycarbonate bodies 1, 1 '. These each have a thickness of approximately 0.6 mm, for example.
  • the surfaces of the two molded polycarbonate bodies 1, 1 'carrying the information in the form of depressions are provided with metal layers 2, 2'.
  • the two metal-coated polycarbonate molded bodies are bonded by an adhesive layer 4. Reading and writing can be done from both sides of the disc.
  • the high-purity polycarbonate body according to the invention is known in suitable, known
  • a stamper which contains the information that will later be stored on the compact disk in the form of small dimples or depressions, is first introduced into one side of a cavity of the injection mold.
  • Polycarbonate granules from a granulate hopper are fed into the plasticizing unit of the Plastic injection molding machine transferred. There, the granules are melted by the shearing action of the rotating screw and the heating devices on the outer circumference of the plasticizing cylinder. The melt travels along the rotating screw and through a non-return valve into the screw antechamber and drives the screw back by the reaction forces that arise. If the desired amount of plasticate is in front of the non-return valve, the screw rotation and thus the material transport is stopped. The screw is then moved axially forward, the non-return valve closes and pushes the plastic into the cavity of the tool, where it cools under decreasing pressure.
  • the polycarbonate lens has a thickness of 0.5 to 3 mm, for example.
  • the center hole of the compact disk is punched, then the tool is opened and the disk is removed.
  • the perforated disk is passed through a metallization system.
  • the metals are evaporated or sputtered onto the polycarbonate molding.
  • Suitable metals are, for example, aluminum, gold, silicon and the rare earths or a mixture of a transition metal such as iron or cobalt and a rare earth element such as terbium, gadolinium, neodymium or disprosium,
  • the protective layer is formed from a resin curable by electron beams or UV rays, a silicone or ceramic material.
  • Polycarbonate in an organic solvent about 15%.
  • the organic solvent consists of methylene chloride (dichloromethane) and chlorobenzene.
  • This process stream had a milky, cloudy appearance and was subjected to a coarse filtration to remove solids with a particle size of approximately 15 ⁇ m.
  • Part of the process stream emerging from the coarse filtration at a temperature of 25 ° C. was fed to the solvent evaporation in order to obtain polycarbonate and another part was heated to about 60 ° C. and passed through a membrane candle filter with a nominal pore size of 0.6 ⁇ m.
  • Case was filtered using a metal sintered candle with a pore size of nominally 1.0 ⁇ m at about 80 ° C.
  • the filtrates were evaporated and the number of particles in the product was determined in the same way as for the unfiltered products.
  • the number of particles was determined using the laser scattered light method. The results are shown in the table below, in addition to the number of particles in the samples, the last line shows the foreign substance index used in the prior art.
  • the number of particles per gram of polymer was determined using a Hiac / Royco model 346 BCL.
  • Foreign particle index I ⁇ ⁇ [0.5 (d, l + d,)] 2 x (n, - n ',) ⁇ / W, where d, is an i-th numerical value ( ⁇ m) for dividing a range of the part diameter denotes, n, the number of foreign particles with a particle diameter of less than d 1 + 1 and not less than d “which were determined in the solution, n ', denotes the number of foreign particles which had previously been determined in the solvent and W denotes the Weight (g) of the material.
  • the sodium content in the polycarbonate solution was determined before the hot filtration stage and after the filtration was carried out at elevated temperature by flame-free atomic absorption spectroscopy. Sodium contents of 100 to 150 ppb were measured before the filtration and 20 to 40 ppb after the filtration stage.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

L'invention concerne un procédé qui permet de fabriquer, selon la technique des interphases, un polycarbonate ayant un indice de particules étrangères inférieur à 2,5.10<4> mu m<2>/g ou renfermant moins de 50 pp.10<9> de sel alcalin. Le procédé consiste à laver la solution contenant le polycarbonate avec un fluide de lavage aqueux, à séparer ledit fluide de lavage et à évaporer le solvant. Il est caractérisé par le fait qu'on chauffe le mélange obtenu après la séparation du fluide de lavage, constitué d'une solution organique et du fluide de lavage restant, jusqu'à obtenir une solution claire, puis qu'on filtre ladite solution afin de séparer les matières solides. Ces polycarbonates peuvent notamment être utilisés pour les supports de données optiques, les lentilles et les prismes.
PCT/EP1999/005451 1998-08-13 1999-07-30 Polycarbonate de grande purete et procede de fabrication associe WO2000009582A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP99938379A EP1105432A1 (fr) 1998-08-13 1999-07-30 Polycarbonate de grande purete et procede de fabrication associe
AU52896/99A AU5289699A (en) 1998-08-13 1999-07-30 Highly pure polycarbonates and method for producing same
BR9913005-0A BR9913005A (pt) 1998-08-13 1999-07-30 Policarbonatos de elevada pureza e processo para sua preparação
JP2000565024A JP2002522605A (ja) 1998-08-13 1999-07-30 高純度のポリカーボネートおよびそれの製造方法
KR1020017001800A KR20010079634A (ko) 1998-08-13 1999-07-30 고순도 폴리카르보네이트 및 그의 제조 방법

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19836664.7 1998-08-13
DE1998136664 DE19836664A1 (de) 1998-08-13 1998-08-13 Hochreine Polycarbonate und Verfahren zu deren Herstellung
DE19847051.7 1998-10-13
DE1998147051 DE19847051A1 (de) 1998-10-13 1998-10-13 Hochreine Polycarbonate und Verfahren zu deren Herstellung

Publications (1)

Publication Number Publication Date
WO2000009582A1 true WO2000009582A1 (fr) 2000-02-24

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PCT/EP1999/005451 WO2000009582A1 (fr) 1998-08-13 1999-07-30 Polycarbonate de grande purete et procede de fabrication associe

Country Status (6)

Country Link
EP (1) EP1105432A1 (fr)
JP (1) JP2002522605A (fr)
KR (1) KR20010079634A (fr)
AU (1) AU5289699A (fr)
BR (1) BR9913005A (fr)
WO (1) WO2000009582A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032381A1 (fr) * 1999-11-03 2001-05-10 Bayer Aktiengesellschaft Granules polymeres de grande purete et procede permettant de les produire
WO2008049548A1 (fr) * 2006-10-25 2008-05-02 Bayer Materialscience Ag Procédé pour séparer une phase organique d'une phase organique aqueuse contenant des électrolytes
WO2008098698A1 (fr) * 2007-02-15 2008-08-21 Bayer Materialscience Ag Utilisation des silicates d'aluminium pour l'élimination ou la réduction des particules fluorescentes dans un polycarbonate
CN102775595A (zh) * 2012-03-12 2012-11-14 甘肃银光聚银化工有限公司 一种聚碳酸酯乳液的连续纯化方法
CN108473755A (zh) * 2016-01-04 2018-08-31 住友精化株式会社 树脂表面粗糙化用组合物

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003026792A (ja) * 2001-07-16 2003-01-29 Teijin Chem Ltd 精製ポリカーボネート樹脂の製造方法

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EP0264885A2 (fr) * 1986-10-22 1988-04-27 Idemitsu Petrochemical Co. Ltd. Procédé de lavage d'une solution d'une résine de polycarbonate dans un solvant organique
EP0300485A2 (fr) * 1987-07-21 1989-01-25 Mitsubishi Gas Chemical Company, Inc. Procédé de préparation de matériau à mouler en résine de polycarbonate à basse teneur en particules
EP0379130A1 (fr) * 1989-01-20 1990-07-25 Idemitsu Petrochemical Co. Ltd. Couche inférieure de disque optique, milieu pour mémoriser l'information optique et procédé et appareil pour fabriquer la couche inférieure de disque optique
EP0417775A2 (fr) * 1989-09-14 1991-03-20 Idemitsu Petrochemical Co. Ltd. Objet moulé pour applications optiques et médium d'emmagasinage d'information optique
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US5288837A (en) * 1991-07-02 1994-02-22 The Dow Chemical Company Preparation of polycarbonate with subsequent addition of chain terminator and base
JPH083307A (ja) * 1994-06-24 1996-01-09 Mitsui Toatsu Chem Inc 芳香族ポリカーボネートの製造方法
DE19510061A1 (de) * 1995-03-20 1996-09-26 Bayer Antwerpen Nv Verfahren zur Reinigung von Polycarbonat
JPH0987501A (ja) * 1995-09-22 1997-03-31 Asahi Chem Ind Co Ltd 添加剤含有樹脂組成物

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EP0264885A2 (fr) * 1986-10-22 1988-04-27 Idemitsu Petrochemical Co. Ltd. Procédé de lavage d'une solution d'une résine de polycarbonate dans un solvant organique
EP0300485A2 (fr) * 1987-07-21 1989-01-25 Mitsubishi Gas Chemical Company, Inc. Procédé de préparation de matériau à mouler en résine de polycarbonate à basse teneur en particules
EP0379130A1 (fr) * 1989-01-20 1990-07-25 Idemitsu Petrochemical Co. Ltd. Couche inférieure de disque optique, milieu pour mémoriser l'information optique et procédé et appareil pour fabriquer la couche inférieure de disque optique
EP0417775A2 (fr) * 1989-09-14 1991-03-20 Idemitsu Petrochemical Co. Ltd. Objet moulé pour applications optiques et médium d'emmagasinage d'information optique
JPH04126715A (ja) * 1990-09-17 1992-04-27 Idemitsu Petrochem Co Ltd ポリカーボネートの製造方法
US5288837A (en) * 1991-07-02 1994-02-22 The Dow Chemical Company Preparation of polycarbonate with subsequent addition of chain terminator and base
JPH05186583A (ja) * 1992-01-13 1993-07-27 Teijin Chem Ltd ポリカーボネートの有機溶媒溶液の精製方法
JPH083307A (ja) * 1994-06-24 1996-01-09 Mitsui Toatsu Chem Inc 芳香族ポリカーボネートの製造方法
DE19510061A1 (de) * 1995-03-20 1996-09-26 Bayer Antwerpen Nv Verfahren zur Reinigung von Polycarbonat
JPH0987501A (ja) * 1995-09-22 1997-03-31 Asahi Chem Ind Co Ltd 添加剤含有樹脂組成物

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CHEMICAL ABSTRACTS, vol. 124, no. 20, 13 May 1996, Columbus, Ohio, US; abstract no. 262048, XP002122604 *
CHEMICAL ABSTRACTS, vol. 127, no. 2, 14 July 1997, Columbus, Ohio, US; abstract no. 18394, XP002122602 *
DATABASE WPI Section Ch Week 199334, Derwent World Patents Index; Class A23, AN 1993-269866, XP002122605 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032381A1 (fr) * 1999-11-03 2001-05-10 Bayer Aktiengesellschaft Granules polymeres de grande purete et procede permettant de les produire
US6720406B1 (en) 1999-11-03 2004-04-13 Bayer Aktiengesellschaft High-purity polymer granules and method for the production thereof
WO2008049548A1 (fr) * 2006-10-25 2008-05-02 Bayer Materialscience Ag Procédé pour séparer une phase organique d'une phase organique aqueuse contenant des électrolytes
WO2008049521A1 (fr) * 2006-10-25 2008-05-02 Bayer Materialscience Ag Procédé pour séparer une phase organique d'une phase organique aqueuse contenant des électrolytes
US8354028B2 (en) 2006-10-25 2013-01-15 Bayer Material Science Ag Method for separating an organic phase from an electrolyte-containing aqueous and organic phase
WO2008098698A1 (fr) * 2007-02-15 2008-08-21 Bayer Materialscience Ag Utilisation des silicates d'aluminium pour l'élimination ou la réduction des particules fluorescentes dans un polycarbonate
CN102775595A (zh) * 2012-03-12 2012-11-14 甘肃银光聚银化工有限公司 一种聚碳酸酯乳液的连续纯化方法
CN108473755A (zh) * 2016-01-04 2018-08-31 住友精化株式会社 树脂表面粗糙化用组合物
CN108473755B (zh) * 2016-01-04 2021-03-19 住友精化株式会社 树脂表面粗糙化用组合物
US11084915B2 (en) 2016-01-04 2021-08-10 Sumitomo Seika Chemicals Co., Ltd. Composition for resin surface roughening

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Publication number Publication date
JP2002522605A (ja) 2002-07-23
KR20010079634A (ko) 2001-08-22
EP1105432A1 (fr) 2001-06-13
BR9913005A (pt) 2001-05-08
AU5289699A (en) 2000-03-06

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