US20100137550A1 - Method and Device for Cleaning an Absorptive Polyester - Google Patents

Method and Device for Cleaning an Absorptive Polyester Download PDF

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Publication number
US20100137550A1
US20100137550A1 US12/598,480 US59848008A US2010137550A1 US 20100137550 A1 US20100137550 A1 US 20100137550A1 US 59848008 A US59848008 A US 59848008A US 2010137550 A1 US2010137550 A1 US 2010137550A1
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Prior art keywords
solvent
dryer
polymer
process according
polyester
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Abandoned
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US12/598,480
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English (en)
Inventor
Anja Enderle
Manfred Schmitt
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Roehm GmbH Darmstadt
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Boehringer Ingelheim Pharma GmbH and Co KG
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Assigned to BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG reassignment BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ENDERLE, ANJA, SCHMITT, MANFRED
Publication of US20100137550A1 publication Critical patent/US20100137550A1/en
Assigned to EVONIK ROEHM GMBH reassignment EVONIK ROEHM GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG
Abandoned legal-status Critical Current

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    • 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
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88—Post-polymerisation treatment
    • C08G63/90—Purification; Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C08L63/08—Epoxidised polymerised polyenes
    • 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
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
    • C08G63/08—Lactones or lactides

Definitions

  • the invention relates to a process for purifying a resorbable polyester, the polymer being dissolved in a first solvent and subsequently the polymer solution being brought into intimate contact with a second solvent under the action of high shear forces in a turbulent shear field, the first solvent being a “genuine” solvent and the second solvent being a non-solvent for the resorbable polyester and being unlimitedly miscible with the first solvent.
  • the invention also relates to a resorbable polyester which is purified using the process and to the use thereof.
  • the invention further relates to a purification device for purifying a resorbable polyester that contains as its main components a dissolving vessel in which the polymer is dissolved in a first solvent, a separation device for separating a moist polymer mass from a polymer suspension and a dryer for drying the polymer mass.
  • Resorbable polyesters in the sense of the invention are homopolymers or copolymers based on lactide (L-lactide, D-lactide, DL-lactide, meso-lactide), glycolide, epsilon-caprolactone, dioxanone, trimethylene carbonate, delta-valerolactone, gamma-butyrolactone, and similar polymerisable heterocycles.
  • the polymers can either be composed of one or else of a plurality of different monomer modules or optionally contain further modules in the polymer chain, such as for example units of ethylene glycol.
  • Preferred according to the invention are homopolymers of D,L-lactide, copolymers of D,L-lactide and glycolide of differing composition and block copolymers of the aforementioned polyester units and polyethylene glycol.
  • Resorbable polyesters are raw materials which are widely used for the production of resorbable, surgical implants and also as a pharmaceutical auxiliary for the formulation of parenteral release systems.
  • poly(lactides) and other resorbable polyesters are used in surgical implants for the fixing of bone fractures, in reticula and membranes for controlled tissue regeneration and in microcapsules and implants for subcutaneous or intramuscular injection, in particular for the controlled release of active ingredients.
  • resorbable polymers After implantation or injection into the body, resorbable polymers are broken down into oligomers in a slow hydrolytic reaction. Hydrolysis end products such as lactic acid or glycolic acid are metabolised into carbon dioxide and water.
  • resorbable polyesters The synthesis of resorbable polyesters is known in the art. They can be prepared by polycondensation from hydroxycarboxylic acids such as lactic acid and/or glycolic acid. Another frequently taken synthesis pathway is the ring-opening polymerisation of the corresponding heterocycles.
  • the crude polymers always contain a specific content of non-converted monomers that frequently cannot be reduced below a value of from 1 to 3% even if the corresponding synthesis processes are optimised.
  • the reason for this is that ring-opening polymerisation is an equilibrium reaction and even during polycondensation the linear polyester is present in equilibrium with the corresponding hydroxycarboxylic acids.
  • Monomers can be removed from partially crystalline polyesters using extraction processes. Suitable for this purpose are solvents which dissolve the monomer but do not dissolve the polymer. Suitable examples include organic solvents such as n-hexane, cyclohexane, methanol, ethanol, acetone or ethyl acetate.
  • EP 0456246 discloses for example an extraction process for resorbable polyesters that uses carbon dioxide as the solvent.
  • Amorphous polyester can generally not be purified by extraction processes, as the relevant solvents either also dissolve the polymer or at least cause it to swell. If supercritical or pressure-liquefied carbon dioxide is used, the polymer mass expands greatly when the pressure is relieved, and this also prevents a process of this type from being carried out.
  • the prior art discloses a number of reprecipitation processes for the purification of amorphous polyesters. These involve dissolution of the crude polymer in a suitable solvent. The addition of a large excess of a non-solvent, which is however miscible with the solvent, causes precipitation of the polymer.
  • U.S. Pat. No. 4,810,775 discloses a purification process for resorbable polyesters having crystallinity of up to 20%, the polymer being dissolved in a solvent, the polymer solution subsequently being brought into intimate contact with a precipitant under the action of high shear forces in a turbulent shear field.
  • the turbulent shear field is generated by a device consisting of a two-fluid nozzle and of a container which is filled with precipitant and into which the two-fluid nozzle protrudes, so the precipitating polymer is broken down into very small particles.
  • the phase separation of the polymer suspension formed during the reprecipitation is carried out either in a centrifuge or by collection in receptacles which, owing to the large amount of solvent required, must be large even in relatively small batch sizes.
  • the object of the invention is therefore to provide an improved purification process for purifying a resorbable polyester, in particular an amorphous polyester, of the type mentioned at the outset that allows a resorbable polyester of high and reproducible quality to be obtained even on an industrial scale. It is furthermore the object of the invention to provide a corresponding device for the process according to the invention.
  • the object concerning the process is achieved according to the invention in that subsequently the polymer suspension, which is formed by the addition of the second solvent, is conveyed onto or into a rotating, cylindrical screen body of a drum shear screen and subsequently the moist polymer mass is separated from the screen body and subsequently dried thereon.
  • This provides a continuously operating separation process which allows the polymer suspension to be separated with high reproducibility into the solid and liquid phase.
  • the continuous mode of operation allows batches of constant quality to be provided irrespective of the amount.
  • the first solvent used is acetone, ethyl acetate, 1,4-dioxane, dimethylacetamide, tetrahydrofuran, toluene, dimethylformamide, dimethylsulphoxide, hexafluoroisopropanol or another halogenated hydrocarbon or a mixture of the aforementioned solvents.
  • a suitable solvent is thus provided depending on the type of polyester and the inherent viscosity of the polyester in solution.
  • Acetone, chloroform or dichloromethane have been found to be particularly suitable as the first solvent.
  • the second solvent used is ethanol, methanol or water or a mixture of the aforementioned solvents.
  • Particularly effective precipitation reactions can thus be achieved, depending on the first solvent used, water in particular being used as the second solvent.
  • Water is non-toxic and non-explosive but cost-effective and particularly environmentally acceptable.
  • the resorbable polyester which is dissolved in the first solvent is filtered and subsequently mixed with the second solvent via a two-fluid nozzle.
  • This produces an intimate contact under the action of high shear forces in the turbulent shear field, as a result of which optimum thorough mixing is achieved.
  • Alternative intensive thorough mixing can also be achieved if both media are injected from two separate nozzles into a flow tube and a fluidised bed is generated at the contact point by means of a rapidly rotating stirrer.
  • the moist polymer mass is separated effectively by means of gravity and by means of one or more helically attached conveyor rails and/or guide blades inside the rotating, cylindrical screen body.
  • This provides restricted conveyance which allows the polymer mass to be conveyed continuously, for example into a receptacle.
  • the process according to the invention can be used to purify cost-effectively and with constant quality, in particular, resorbable polyesters having an amorphous or partially crystalline structure.
  • Resorbable polyesters purified in this way preferably contain one or more units derived from lactide (L-lactide, D-lactide, DL-lactide, meso-lactide), glycolide, trimethylene carbonate, epsilon-caprolactone, gamma-butyrolactone, dioxanone, delta-valerolactone and/or similar polymerisable heterocycles and/or polyethylene glycols.
  • lactide L-lactide, D-lactide, DL-lactide, meso-lactide
  • glycolide trimethylene carbonate
  • epsilon-caprolactone gamma-butyrolactone
  • dioxanone dioxanone
  • delta-valerolactone delta-valerolactone
  • a resorbable polyester which is composed of D,L-lactide or copolymers of D,L-lactide and glycolide having any desired composition or a block copolymer of D,L-lactide, or D,L-lactideco-glycolide having any desired composition and polyethylene glycol.
  • the residual monomer content after the purification has been carried out using the process according to the invention, is less than 1%, in particular less than 0.5%, a residual monomer content of below 0.1% being achievable.
  • the solvent and/or moisture content of the resorbable polyester is less than 2%, values of below 1%, in particular values of below 0.5% being achieved under beneficial settings. If dried particularly intensively, the solvent and/or moisture content of the resorbable polyester is ⁇ 0.1%.
  • a particularly preferred use of the resorbable polyester provides for the production of pharmaceutical formulations or resorbable implants.
  • the separation device is constructed as a drum shear screen comprising a rotating, cylindrical screen body.
  • Conveyor rails and/or guide blades inside the cylindrical screen body allow, in conjunction with the rotational movement of the screen body, the polymer mass to be conveyed continuously into, for example, a receptacle.
  • the drum shear screen has a suction device, in particular comprising a suction nozzle, above the rotating, cylindrical screen body in an upper housing cover.
  • a suction device in particular comprising a suction nozzle, above the rotating, cylindrical screen body in an upper housing cover.
  • a dryer which is configured as a fluidised bed dryer, circulating air dryer or tubular-flow dryer is particularly suitable for effective drying of the moist polymer mass.
  • the dryer has in a preferred embodiment a conical portion and a cylindrical portion, intensive swirling of the polymer mass to be dried being achieved in the conical portion of the dryer owing to the drying agent, for example nitrogen or air, which flows in from below.
  • the drying agent for example nitrogen or air, which flows in from below.
  • a grater is provided for the polymer. During drying, the polymer mass to be dried can be removed from the dryer and grated via the grater, after which the drying is continued.
  • the dryer has inside the cylindrical portion at least one screen insert.
  • the dryer expediently comprises a filter bag.
  • a swivel bearing of the dryer in a frame allows the dryer to be tilted, thus allowing the filter bag which is fastened to the dryer on the end side and comprises the dried polymer powder easily to be removed.
  • the polymer mass to be dried can be mixed thoroughly more easily during the drying process.
  • At least the product-guiding parts of the drum shear screen and of the dryer are made of stainless steel, thus ensuring high product quality with regard to pharmacological requirements.
  • FIG. 1 Is a schematic view of a purification device for resorbable polyesters for carrying out the process according to the invention
  • FIG. 2 is a perspective exploded view of the drum shear screen according to FIG. 1 .
  • FIG. 3 is a perspective view of the dryer according to FIG. 1 .
  • a purification device 1 comprises as its main component for a first process step a dissolving vessel 10 in which a polyester crude product 11 to be purified is placed.
  • a typical size of the dissolving vessel 10 is in the range of from 50 to 1,000 l and can, in the case of larger systems, be as much as 2,000 l or more.
  • the addition of a first solvent 12 causes dissolution in the dissolving vessel 10 of the polyester crude product 11 with the aid of a stirrer 13 and/or by constant recirculation of the solution.
  • Impurities in the polyester crude product 11 for example in the form of lint, are separated, for example by filtration.
  • first solvents 12 acetone, ethyl acetate, 1,4-dioxane, dimethylacetamide, tetrahydrofuran, toluene, dimethylformamide, dimethylsulphoxide, hexafluoroisopropanol or another halogenated hydrocarbon or a mixture of the aforementioned solvents.
  • acetone, chloroform or dichloromethane have proven particularly suitable as first solvents 12 .
  • a pump for example a diaphragm pump, is used to pump the polymer solution via a filter 30 containing a fine-meshed screen, preferably made of stainless steel.
  • a filter 30 containing a fine-meshed screen, preferably made of stainless steel.
  • insoluble impurities are separated off.
  • Typical mesh sizes are in this case a few ⁇ m, typically in the range of from 1 to 10 ⁇ m.
  • the polymer solution is intensively mixed via a two-fluid nozzle 40 by means of a second solvent 41 , which is a non-solvent for the polymer, and the polymer suspension resulting therefrom is guided into the interior of a rotating screen body 71 of a drum shear screen 70 via a conveyor 60 , in the simplest case directly or via a flow tube or a pipe, wherein the conveyance can be carried out by means of gravity, conventional pumps or by pressurisation by means of a gas.
  • the second solvent 41 used is ethanol, methanol or water or a mixture of the aforementioned solvents for precipitation. Water is a particularly preferred second solvent 41 owing to its toxicological safeness and environmental acceptability.
  • the polymer suspension can be separated into the solvent mixture and into the precipitated polymer mass.
  • One or more helically attached guide rails and/or guide blades 72 inside the screen body 71 subject the polymer mass to restricted conveyance, so the polymer mass is transported to a solid outlet 75 .
  • the solvent mixture can in this case flow away downward through a liquid outlet 73 .
  • Solvent vapours can be removed by suction via a suction device 74 , for example a suction nozzle, in a housing cover 76 of the drum shear screen 70 above the screen body 71 , and this is advantageous with regard to the explosion protection class of the surrounding building.
  • the still-moist polymer mass which collects at the solid outlet 75 is transported using a solid conveyor 80 either directly into a dryer 90 or into a collection vessel. Batchwise filling of the dryer 90 from the collection vessel is possible in addition to continuous feeding.
  • the dryer 90 has a conical portion 95 and a cylindrical portion 96 . At least one screen insert 94 is provided inside the cylindrical portion 96 .
  • the drying agent 91 for example nitrogen or air, is introduced laterally from below into the conical portion 95 of the dryer 90 , so intensive swirling is achieved inside the dryer 90 .
  • the dryer 90 has a filter bag 92 for collecting the purified and dried resorbable polyester.
  • the drum shear screen 70 In the configuration of the drum shear screen 70 according to FIG. 2 , there may be seen on the inside the rotating screen body 71 into which the polymer suspension can be introduced via a U-shaped channel.
  • the screen body 71 is positioned slightly obliquely.
  • One or more helically attached guide rails and/or guide blades 72 inside the screen body 71 cause the restricted conveyance of the polymer mass to the solid outlet 75 .
  • Solvent vapours are removed by suction via the suction device 74 in the housing cover 76 of the drum shear screen 70 above the screen body 71 .
  • the screen body 71 is closed on its back to prevent the inside of the screen from becoming contaminated with abraded material from the drive unit. The back can be opened for purification purposes.
  • the dryer 90 according to FIG. 3 which is arranged in a movable frame 97 , can be tilted by means of a swivel bearing 93 .
  • the filter bag 92 is not shown.
  • at least the product-guiding parts of the drum shear screen 70 and of the dryer 90 are made of stainless steel.
  • the polyester crude product 11 is dissolved with the previously calculated amount of acetone as the first solvent 12 .
  • the polyester crude product 11 is weighed out and placed in the dissolving vessel 10 .
  • the calculated amount of acetone is added and the crude product dissolved by recirculation within approx. 24-72 hours.
  • the mixing ratio is dependent on the starting substances used (monomers or heterocycles) and the inherent viscosity of the crude product and is, for example in a copolymer of D,L-lactide and glycolide; 50:50 mol %; inherent viscosity of 0.5 dl/g measured as a 0.1% solution in chloroform; solution for precipitation is dispensed with, 8% by weight of polymer in acetone.
  • the polymer solution is conveyed into the two-fluid nozzle 40 by means of the pump 20 via a filter 30 made of stainless steel having a mesh size of 5 ⁇ m and a flowmeter.
  • the flow is dependent on the nature of the crude product used and is generally up to 20 l/h.
  • This figure relates to a flowmeter which is adjusted to the density of acetone.
  • the differing densities of the polymer solutions to be precipitated prevent precise flow measurement (except for mass flowmeters).
  • the polymer solution is injected into a water jet at a flow rate of approx. 700-1000 l/h, the dissolved crude product precipitating immediately in the form of flakes or fibres.
  • the suspension consisting of water, product flakes, monomer and acetone
  • the suspension is guided into the drum shear screen 70 via a pipe.
  • the suspension is guided into the rear region of the drum shear screen 70 .
  • the discharging water/acetone mixture which contains the monomers to be separated off, initially forms a product layer at this location. If the product layer is sufficiently heavy, it becomes detached from the wall and forms a product cluster (snowball system).
  • the guide blades 72 which run obliquely forward, and the rotational movement, these product clusters are slowly conveyed toward the solid outlet 75 in the screen body 71 .
  • the water/acetone mixture is separated off, on the one hand, by means of gravity and, on the other hand, by wedge-shaped screen profile bars and the Coand ⁇ hacek over (a) ⁇ effect resulting therefrom.
  • the solid is guided into the dryer 90 or the collection vessel by means of the solid conveyor 80 .
  • the dryer 90 which is configured as a tubular-flow dryer, the moist polymer mass is dried by means of a throughflow of air or nitrogen.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Medicinal Preparation (AREA)
  • Materials For Medical Uses (AREA)
US12/598,480 2007-05-04 2008-05-02 Method and Device for Cleaning an Absorptive Polyester Abandoned US20100137550A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007020951A DE102007020951A1 (de) 2007-05-04 2007-05-04 Verfahren und Vorrichtung zur Reinigung eines resorbierbaren Polyesters
DE102007020951.9 2007-05-04
PCT/EP2008/055408 WO2008135523A1 (de) 2007-05-04 2008-05-02 Verfahren und vorrichtung zur reinigung eines resorbierbaren polyesters

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/055408 A-371-Of-International WO2008135523A1 (de) 2007-05-04 2008-05-02 Verfahren und vorrichtung zur reinigung eines resorbierbaren polyesters

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US13/032,198 Continuation US9156942B2 (en) 2007-05-04 2011-02-22 Method and device for cleaning an absorptive polyester

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US20100137550A1 true US20100137550A1 (en) 2010-06-03

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US12/598,480 Abandoned US20100137550A1 (en) 2007-05-04 2008-05-02 Method and Device for Cleaning an Absorptive Polyester
US13/032,198 Active 2030-11-03 US9156942B2 (en) 2007-05-04 2011-02-22 Method and device for cleaning an absorptive polyester

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US (2) US20100137550A1 (pt)
EP (2) EP2246381A3 (pt)
JP (1) JP5654342B2 (pt)
KR (1) KR20100016203A (pt)
CN (1) CN101675092B (pt)
AR (1) AR066434A1 (pt)
AU (1) AU2008248649A1 (pt)
BR (1) BRPI0810713A8 (pt)
CA (1) CA2686045A1 (pt)
DE (1) DE102007020951A1 (pt)
ES (1) ES2627727T3 (pt)
HK (1) HK1138027A1 (pt)
IL (1) IL201279A (pt)
MX (1) MX2009011077A (pt)
NZ (1) NZ580827A (pt)
RU (1) RU2473577C2 (pt)
TW (1) TWI428365B (pt)
WO (1) WO2008135523A1 (pt)

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US8735504B2 (en) 2012-05-02 2014-05-27 Warsaw Orthopedic, Inc. Methods for preparing polymers having low residual monomer content
WO2015028060A1 (en) 2013-08-29 2015-03-05 Evonik Industries Ag Process for preparing a bio-resorbable polyester in the form of a powder
WO2016075071A1 (en) 2014-11-14 2016-05-19 Evonik Röhm Gmbh Process for preparing a bio-resorbable polyester in particulate form
CN112694605A (zh) * 2020-12-29 2021-04-23 浙江圣兆药物科技股份有限公司 一种聚酯类产品的纯化方法和生产设备
US11052053B2 (en) 2018-05-08 2021-07-06 Evonik Operations Gmbh Nanoparticle comprising a bio-resorbable polyester, a hydrophilic polymer and an acylated human lactoferrin-derived peptide

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WO2010053242A1 (en) 2008-11-07 2010-05-14 Samyang Corporation Highly purified polylactic acid or a derivative thereof, a salt of the same, and purification method thereof
DE102011014131A1 (de) 2011-03-15 2012-09-20 Thyssenkrupp Uhde Gmbh Verfahren zur Trocknung von feuchtem Polymerpulver und dafür geeignete Vorrichtung
CN103421172B (zh) * 2012-05-23 2016-01-20 上海现代药物制剂工程研究中心有限公司 一种生物可降解聚酯的纯化工艺
WO2014108191A1 (en) 2013-01-10 2014-07-17 Evonik Industries Ag Electronic device unit comprising a polymer coating
CN103105047B (zh) * 2013-01-30 2014-10-22 青岛沃隆花生机械有限公司 连续式去水机
JP5959728B2 (ja) 2013-04-11 2016-08-02 三井化学株式会社 乳酸―グリコール酸共重合体の製造法またはその塩の製造法
CN106687077B (zh) 2014-09-07 2021-07-27 奥西奥有限公司 各向异性生物复合材料、包含各向异性生物复合材料的医疗植入物及其治疗方法
CA2971990C (en) 2014-12-26 2023-03-28 Orahn Preiss-Bloom Continuous-fiber reinforced biocomposite medical implants
EP3307247A1 (en) 2015-06-10 2018-04-18 Evonik Röhm GmbH Process for preparing a powder comprising a human coagulation factor protein and a lactic acid polymer
WO2018002917A1 (en) * 2016-06-27 2018-01-04 Ossio Ltd. Fiber reinforced biocomposite medical implants with high mineral content
CN111050677B (zh) 2017-09-07 2023-06-20 奥西西奥有限公司 纤维增强的生物复合材料带螺纹的植入物
JP2019167402A (ja) * 2018-03-22 2019-10-03 三井化学株式会社 乳酸−グリコール酸共重合体を含む粉体の製造方法
DE102019205941A1 (de) * 2019-04-25 2020-10-29 Robert Bosch Gmbh Verfahren zur Behandlung mindestens einer Oberfläche eines Polymers
CN114058072A (zh) * 2020-08-07 2022-02-18 Apk股份公司 通过集成的滚筒干燥和挤出从聚合物溶液除去溶剂的方法
CN112595033B (zh) * 2020-12-10 2022-11-08 万华化学集团股份有限公司 一种颜色稳定的聚碳酸酯粉末的制备方法
CN117337168A (zh) 2021-04-01 2024-01-02 渤健马萨诸塞州股份有限公司 向中枢神经系统的核酸递送

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