WO1988008011A1 - Process for preparing a powder of water-insoluble polymer which can be redispersed in a liquid phase, the resulting powder and utilization therof - Google Patents
Process for preparing a powder of water-insoluble polymer which can be redispersed in a liquid phase, the resulting powder and utilization therof Download PDFInfo
- Publication number
- WO1988008011A1 WO1988008011A1 PCT/EP1988/000281 EP8800281W WO8808011A1 WO 1988008011 A1 WO1988008011 A1 WO 1988008011A1 EP 8800281 W EP8800281 W EP 8800281W WO 8808011 A1 WO8808011 A1 WO 8808011A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- polymer
- solution
- fact
- solute
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/14—Powdering or granulating by precipitation from solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/06—Making microcapsules or microballoons by phase separation
- B01J13/12—Making microcapsules or microballoons by phase separation removing solvent from the wall-forming material solution
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/07—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/20—Pills, tablets, discs, rods
- A61K9/28—Dragees; Coated pills or tablets, e.g. with film or compression coating
- A61K9/2806—Coating materials
- A61K9/2833—Organic macromolecular compounds
- A61K9/286—Polysaccharides, e.g. gums; Cyclodextrin
Definitions
- the invention pertains to the area of latexes, dis ⁇ persions in a liquid phase of water-insoluble polymers, also called pseudo-latexes, and powders of such polymers which can be redispersed in a liquid phase.
- the objective of the invention is a process for preparing a powder of water-insoluble polymer, which can be redispersed in a liquid phase, as well as utilization of such a powder to produce a pseudo-latex.
- Pseudo-latexes are currently offered particularly as aqueous coating means or as medication vectors. During prolonged storage periods, however, a progressive loss of stability is noted, due, among other things, to the phenomenon of irreversible hydrolysis or flocculation. These pseudo-latexes sometimes contain high proportions of surfactants, which can render them unsuitable for certain purposes, especially pharmaceutical ones. In addition, for a given proportion of particles in liquid dispersion, it is necessary to transport large volumes of liquids, which is very costly on an industrial scale.
- the present invention it is now possible to obtain, easily and with practically no limitation, microparticles of water-insoluble polymers in the form of easily redispersible powders, as well as pseudo- latexes in the liquid dispersion state, without being faced with the disadvantages enumerated above.
- the invention is defined in particular in claims 1 and 9.
- the invention is based on the discovery that certain organic solvents, although miscible in all proportions with pure water, lead to the formation of a two-phase liquid-liquid system when they are added to concentrated aqueous solutions of a salt or even of a substance not subject to electrolytic dissociation.
- the first step is to prepare a concentrated aqueous solution of a solute, to which a water-soluble macro- molecular substance is added in sufficient quantity to produce a viscous solution or a gel.
- solute such as a mineral salt, such as magnesium, aluminum or sodium chloride ' , for example, or a metal sulfate, sulfite, nitrate, carbonate or phosphate as the solute. It is also possible to use a nonelectrolyte, such as a sugar-like glucose or sucrose, for example.
- the quantity of solute added will preferably be such that the aqueous solution is satu ⁇ rated or practically saturated, or more generally, suf ⁇ ficiently concentrated in solute that, once it is suit ⁇ ably mixed with the above-mentioned organic phase, it causes precipitation of the polymer microparticles.
- a water-soluble macromolecular sub ⁇ stance is added to the said solution, designed to act as a protective hydrocolloid, at both the product prepara ⁇ tion stage and the finished product stage, once the finished product has been redispersed in an aqueous medium.
- a water-soluble macromolecular polysaccharide such as gum arabic or gum tragacanth or a water-soluble polypeptide such as gelatin can be used as this sub- 5 stance. It is also possible to use a water-soluble polymer of synthetic origin, polyvinyl alcohol in par ⁇ ticular. This list is not, however, exhaustive.
- the water-soluble macromolecular substance is added to the concentrated aqueous solution in a quantity such
- an organic solvent which is at least par ⁇ tially miscible with water such as an alcohol, a poly- alcohol or a ketone, for example. It is preferable to use an organic solvent which is miscible with water in all proportions, since this correspondingly facilities
- the solvent should also be selected on the basis of its volatility and low toxic- ity, especially in view of the pharmaceutical applica ⁇ tion of the resulting product, for example, acetone,
- pure water is then added to the resulting emulsion in sufficient quantity so that all of the organic solvent diffuses into the aqueous phase, thus causing the formation of micropar ⁇ ticles of polymer suspended in the said aqueous phase.
- the water is added in the conventional way at the tem ⁇ peratures indicated above.
- the resulting microparticles of polymer are first of all collected by sedimentation or centrifugation, and then, after elimi ⁇ nation of the supernatant organic-aqueous phase, sub ⁇ jected to as many washings as necessary.
- micropar- tides are washed by suspending them in water, with the addition, if necessary, of an organic solvent (for example, alcohol) , which makes it possible to perform such an operation at low temperature. Any traces of excess solute and excess water-soluble macromolecular substance (protective hydrocolloid) are thereby elimi ⁇ nated.
- an organic solvent for example, alcohol
- a pseudo-latex in the liquid dispersion state can then easily be obtained at this stage of the operation by simply suspending the microparticles in water after the last washing stage.
- the pseudo-latexes obtained in this manner are found to be, in the liquid dispersion state, extremely resis ⁇ tant to the addition of electrolytes, in contrast to pseudo-latexes prepared using methods known hitherto. This should facilitate the incorporation into the aque ⁇ ous phase of medications or any other adjuvant.
- Theolog ⁇ ical properties (low viscosity) and gelling resistance are greatly improved.
- the protective hydrocolloid, which is not solidly anchored to the surface of the pseudo-latex microparticles, is eliminated during the washing stage. This ensures that a product appropriate for coating applications and for the manufacture of films and membranes, such as those encountered espe- 5 cially in the pharmaceutical field, will be obtained.
- the microparticles of polymer are dried using any appropriate technique, once the washing operation is finished.
- One preferred drying technique is freeze- drying; it also has the advantage of promoting redis- persion of the powdered product which is produced. In addition, it is performed at a very low temperature, which is of capital importance when heat-sensitive polymers are used. In certain cases, of course, air drying or drying by atomization can be used.
- the dried pseudo-latex powder rapidly redisperses in an aqueous medium, forming practically no clumps, under gentle agitation applied either manually or mechanically or with ultrasound.
- _ n ranging between 100 nm and 50 ⁇ m.
- the process according to the invention does not at any time require an increase in temperature, unlike methods which utilize an organic solvent evaporation stage or a spray-drying stage. Indeed, it is even pos ⁇ sible to perform the process at a low temperature (-20°C) , thanks to the presence of electrolyte in the aqueous phase. Since the pseudo-latex is not coagulated 5 by the addition of a certain proportion of organic sol ⁇ vent to the continuous phase, it is possible, if appli ⁇ cable, to use a mixture of water and organic solvent for washing in lieu of pure water. This capability of work ⁇ ing at low temperature can be an important advantage 0 when biopolymers are being manipulated, or when heat- sensitive substances such as peptides or antibiotics are to be added.
- the process according to the invention is applic ⁇ able, in principle, to all water-insoluble polymers, 5 provided the latter are soluble in an organic or mineral solvent and even to certain polymers which are soluble in water but insoluble in an aqueous solution that is concentrated in solute. In the latter case, however, it is best to crosslink the polymer that has thus been o salted out so as to make it insoluble in pure water.
- Certain water-insoluble polar polymers such as cellulose, cellulose acetate or the polysulfones, do not dissolve easily except in solvents which are miscible with water. From this point of view, the proposed pro- r cess facilitates or makes possible the production of pseudo-latexes from this type of polymer.
- the freeze-dried powder is greasy and can easily be redispersed in water with gentle agitation (particle size as measured with a Coulter Nano-Sizer: sample before drying: 1223 ⁇ 169 nm; sample redispersed in 2 Q aqueous phase: 1157 ⁇ 169 nm) .
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Medicinal Preparation (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019880701673A KR960002225B1 (en) | 1987-04-16 | 1988-04-01 | Process for preparing a powder of water-insoluble polymer which |
AT88903232T ATE84806T1 (en) | 1987-04-16 | 1988-04-01 | METHOD OF MAKING A WATER-INSOLUBLE POLYMER POWDER THAT CAN BE REDISPERSED IN A LIQUID PHASE AND METHOD OF MAKING A DISPERSION OF THE POLYMER POWDER. |
BR888806902A BR8806902A (en) | 1987-04-16 | 1988-04-01 | PROCESS FOR PREPARING A POOL OF INSOLUBLE POLYMER IN WATER THAT MAY BE REDISPERSED IN A LIQUID PHASE, AS A RESULTING POINT AND ITS USE |
FI885767A FI96219C (en) | 1987-04-16 | 1988-12-13 | A process for preparing a water-insoluble polymer powder which can be redispersed in the liquid phase |
DK198806986A DK173005B1 (en) | 1987-04-16 | 1988-12-15 | Process for the preparation of a water-insoluble polymer powder that can be redispersed in a liquid phase, together with a process for the preparation of a water- insoluble polymer in the form of a liquid dispersion |
NO885570A NO174208C (en) | 1987-04-16 | 1988-12-15 | Process for the preparation of a water-insoluble polymer powder and a water-insoluble polymer dispersion in water, and for the preparation of redispersed powder in water |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1497/87-6 | 1987-04-16 | ||
CH149787 | 1987-04-16 | ||
CA000580702A CA1340020C (en) | 1987-04-16 | 1988-10-20 | Process for preparing a powder of water-insoluble polymer which can be redispersed in a liquid phase, the resulting powder and utilization thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988008011A1 true WO1988008011A1 (en) | 1988-10-20 |
Family
ID=25672190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1988/000281 WO1988008011A1 (en) | 1987-04-16 | 1988-04-01 | Process for preparing a powder of water-insoluble polymer which can be redispersed in a liquid phase, the resulting powder and utilization therof |
Country Status (15)
Country | Link |
---|---|
US (1) | US4968350A (en) |
EP (2) | EP0309527B1 (en) |
JP (1) | JP2564386B2 (en) |
AT (1) | ATE84806T1 (en) |
AU (1) | AU610594B2 (en) |
BR (1) | BR8806902A (en) |
CA (1) | CA1340020C (en) |
DE (1) | DE3877678T2 (en) |
DK (1) | DK173005B1 (en) |
ES (1) | ES2035949T3 (en) |
FI (1) | FI96219C (en) |
GR (1) | GR3006969T3 (en) |
IE (1) | IE62111B1 (en) |
NO (1) | NO174208C (en) |
WO (1) | WO1988008011A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0388954A2 (en) * | 1989-03-23 | 1990-09-26 | FMC Corporation | Freeze-dried polymer dispersions and the use thereof in preparing sustained-release pharmaceutical compositions |
EP0752245A1 (en) * | 1995-07-05 | 1997-01-08 | University Of Liege | Biocompatible and biodegradable nanoparticles designed for proteinaceous drugs absorption and delivery |
WO1999011695A1 (en) * | 1997-08-28 | 1999-03-11 | Aventis Research & Technologies Gmbh & Co Kg | Spherical microparticles containing linear polysaccharides |
FR2774383A1 (en) * | 1998-02-02 | 1999-08-06 | Rhodia Chimie Sa | WATER REDISPERSABLE PULVERULENT COMPOSITION BASED ON FILMOGENIC POLYMER AND AT LEAST ONE POLYPEPTIDE |
WO2000012589A1 (en) * | 1998-08-28 | 2000-03-09 | Celanese Ventures Gmbh | Method for the production of small spherical particles containing at least one water-insoluble linear polysaccharide |
DE19839214C1 (en) * | 1998-08-28 | 2000-05-25 | Aventis Res & Tech Gmbh & Co | Process for the production of spherical microparticles with a smooth surface which consist wholly or partly of at least one water-insoluble linear polysaccharide, and microparticles obtainable by this process and their use |
WO2001080835A1 (en) * | 2000-04-24 | 2001-11-01 | Tanabe Seiyaku Co., Ltd. | Process for producing microsphere |
US6632671B2 (en) | 2000-02-28 | 2003-10-14 | Genesegues, Inc. | Nanoparticle encapsulation system and method |
EP1728814A1 (en) | 2005-05-30 | 2006-12-06 | Gkss-Forschungszentrum Geesthacht Gmbh | Process for the preparation of nanoparticles making use of porous membranes |
EP2623542A1 (en) * | 2010-09-28 | 2013-08-07 | Toray Industries, Inc. | Polymer microparticles and process for production thereof |
US10987308B2 (en) | 2014-09-03 | 2021-04-27 | Genesegues, Inc. | Therapeutic nanoparticles and related compositions, methods and systems |
US11548999B2 (en) | 2019-07-10 | 2023-01-10 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Method for manufacturing resin beads, resin beads, and product employing resin beads |
US11926718B2 (en) | 2020-09-01 | 2024-03-12 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Resin beads, method for producing resin beads, and product using resin beads |
US11998630B2 (en) | 2020-03-04 | 2024-06-04 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Resin beads, method for producing resin beads and product using resin beads |
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US5258436A (en) * | 1989-12-19 | 1993-11-02 | Fmc Corporation | Film-forming composition; method of producing same and use for coating pharmaceuticals and foods and the like |
US6515009B1 (en) | 1991-09-27 | 2003-02-04 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
US5811447A (en) * | 1993-01-28 | 1998-09-22 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
US5770609A (en) * | 1993-01-28 | 1998-06-23 | Neorx Corporation | Prevention and treatment of cardiovascular pathologies |
US6306421B1 (en) | 1992-09-25 | 2001-10-23 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
US6251920B1 (en) | 1993-05-13 | 2001-06-26 | Neorx Corporation | Prevention and treatment of cardiovascular pathologies |
US6395494B1 (en) | 1993-05-13 | 2002-05-28 | Neorx Corporation | Method to determine TGF-β |
US5595722A (en) * | 1993-01-28 | 1997-01-21 | Neorx Corporation | Method for identifying an agent which increases TGF-beta levels |
US6663881B2 (en) | 1993-01-28 | 2003-12-16 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
US5981568A (en) | 1993-01-28 | 1999-11-09 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
US6491938B2 (en) | 1993-05-13 | 2002-12-10 | Neorx Corporation | Therapeutic inhibitor of vascular smooth muscle cells |
WO1994026303A1 (en) * | 1993-05-13 | 1994-11-24 | Neorx Corporation | Prevention and treatment of pathologies associated with abnormally proliferative smooth muscle cells |
JP2812164B2 (en) * | 1993-11-30 | 1998-10-22 | 三菱化学株式会社 | Method for producing carboxylic acid group-containing polymer powder |
JP3492787B2 (en) * | 1994-04-15 | 2004-02-03 | 信越化学工業株式会社 | Method for concentrating aqueous emulsion for coating solid preparations |
US20040018236A1 (en) * | 1995-05-08 | 2004-01-29 | Robert Gurny | Nanoparticles for oral administration of pharmaceutical agents of low solubility |
JPH11510479A (en) | 1995-06-07 | 1999-09-14 | ネオルックス コーポレイション | Prevention and treatment of cardiovascular disease with tamoxifen analogs |
FR2740461B1 (en) * | 1995-10-25 | 1997-12-19 | Rhone Poulenc Chimie | WATER REDISPERSABLE POWDER COMPOSITION OF FILM-FORMING POLYMERS PREPARED FROM ETHYLENICALLY UNSATURATED MONOMERS |
US6143037A (en) * | 1996-06-12 | 2000-11-07 | The Regents Of The University Of Michigan | Compositions and methods for coating medical devices |
US6413489B1 (en) * | 1997-04-15 | 2002-07-02 | Massachusetts Institute Of Technology | Synthesis of nanometer-sized particles by reverse micelle mediated techniques |
US6153231A (en) * | 1997-06-25 | 2000-11-28 | Wm. Wrigley Jr. Company | Environmentally friendly chewing gum bases |
FR2766368B1 (en) * | 1997-07-24 | 2000-03-31 | Univ Claude Bernard Lyon | METHOD FOR PREPARING NANOCAPSULES OF THE VESICULAR TYPE, USABLE IN PARTICULAR AS COLLOIDAL VECTORS OF PHARMACEUTICAL OR OTHER ACTIVE PRINCIPLES |
US5985313A (en) * | 1997-10-22 | 1999-11-16 | New York Blood Center, Inc. | Method for decreasing the frequency of transmission of viral infections using cellulose acetate phthalate or hydroxypropyl methylcellulose phthalate excipients |
US6165493A (en) * | 1997-10-22 | 2000-12-26 | New York Blood Center, Inc. | "Methods and compositions for decreasing the frequency of HIV, herpesvirus and sexually transmitted bacterial infections" |
US6316592B1 (en) | 2000-05-04 | 2001-11-13 | General Electric Company | Method for isolating polymer resin from solution slurries |
SE0003125D0 (en) * | 2000-09-05 | 2000-09-05 | Astrazeneca Ab | Modified polymers |
US20040038303A1 (en) * | 2002-04-08 | 2004-02-26 | Unger Gretchen M. | Biologic modulations with nanoparticles |
US7455858B2 (en) | 2002-05-16 | 2008-11-25 | Qlt Inc. | Compositions and methods for delivery of photosensitive drugs |
US7674608B2 (en) | 2007-02-23 | 2010-03-09 | The University Of Toledo | Saccharifying cellulose |
JP5563313B2 (en) | 2007-03-14 | 2014-07-30 | ザ・ユニバーシティ・オブ・トレド | Biomass pretreatment |
US7999355B2 (en) * | 2008-07-11 | 2011-08-16 | Air Products And Chemicals, Inc. | Aminosilanes for shallow trench isolation films |
US10087326B2 (en) | 2016-02-29 | 2018-10-02 | Michelman, Inc. | Aqueous-based hydrolytically stable dispersion of a biodegradable polymer |
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US2809192A (en) * | 1954-05-25 | 1957-10-08 | Atlantic Res Corp | Method of making cellulose esters in the form of small, dense, spherical particles |
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GB2152936A (en) * | 1984-01-24 | 1985-08-14 | Daicel Chem | Porous spherical cellulose acetate particles |
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US2809120A (en) * | 1954-05-25 | 1957-10-08 | Atlantic Res Corp | Cellulose ester compositions |
US3485651A (en) * | 1967-12-18 | 1969-12-23 | Hercules Inc | Water-soluble cellulose ether or starch compositions |
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DE3344242A1 (en) * | 1983-12-07 | 1985-06-20 | Wacker-Chemie GmbH, 8000 München | METHOD FOR PRODUCING A REDISPERGABLE DISPERSION POWDER AND ITS APPLICATION |
-
1988
- 1988-04-01 US US07/294,516 patent/US4968350A/en not_active Expired - Fee Related
- 1988-04-01 AT AT88903232T patent/ATE84806T1/en not_active IP Right Cessation
- 1988-04-01 EP EP88903232A patent/EP0309527B1/en not_active Expired - Lifetime
- 1988-04-01 WO PCT/EP1988/000281 patent/WO1988008011A1/en active IP Right Grant
- 1988-04-01 DE DE88903232T patent/DE3877678T2/en not_active Expired - Fee Related
- 1988-04-01 BR BR888806902A patent/BR8806902A/en not_active IP Right Cessation
- 1988-04-01 JP JP63503317A patent/JP2564386B2/en not_active Expired - Lifetime
- 1988-04-01 AU AU16806/88A patent/AU610594B2/en not_active Ceased
- 1988-04-06 IE IE102688A patent/IE62111B1/en not_active IP Right Cessation
- 1988-10-14 ES ES198888810703T patent/ES2035949T3/en not_active Expired - Lifetime
- 1988-10-14 EP EP88810703A patent/EP0363549B1/en not_active Expired - Lifetime
- 1988-10-20 CA CA000580702A patent/CA1340020C/en not_active Expired - Fee Related
- 1988-12-13 FI FI885767A patent/FI96219C/en not_active IP Right Cessation
- 1988-12-15 NO NO885570A patent/NO174208C/en not_active IP Right Cessation
- 1988-12-15 DK DK198806986A patent/DK173005B1/en active IP Right Grant
-
1993
- 1993-02-04 GR GR930400219T patent/GR3006969T3/el unknown
Patent Citations (3)
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US2809192A (en) * | 1954-05-25 | 1957-10-08 | Atlantic Res Corp | Method of making cellulose esters in the form of small, dense, spherical particles |
FR1264953A (en) * | 1960-08-11 | 1961-06-23 | Basf Ag | Process for the production of plastics in the form of beads |
GB2152936A (en) * | 1984-01-24 | 1985-08-14 | Daicel Chem | Porous spherical cellulose acetate particles |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0388954A2 (en) * | 1989-03-23 | 1990-09-26 | FMC Corporation | Freeze-dried polymer dispersions and the use thereof in preparing sustained-release pharmaceutical compositions |
EP0388954A3 (en) * | 1989-03-23 | 1992-09-09 | FMC Corporation | Freeze-dried polymer dispersions and the use thereof in preparing sustained-release pharmaceutical compositions |
EP0752245A1 (en) * | 1995-07-05 | 1997-01-08 | University Of Liege | Biocompatible and biodegradable nanoparticles designed for proteinaceous drugs absorption and delivery |
WO1997002022A1 (en) * | 1995-07-05 | 1997-01-23 | European Community | Biocompatible and biodegradable nanoparticles designed for proteinaceous drugs absorption and delivery |
US5962566A (en) * | 1995-07-05 | 1999-10-05 | European Community | Biocompatible and biodegradable nanoparticles designed for proteinaceous drugs absorption and delivery |
WO1999011695A1 (en) * | 1997-08-28 | 1999-03-11 | Aventis Research & Technologies Gmbh & Co Kg | Spherical microparticles containing linear polysaccharides |
US6703048B1 (en) | 1997-08-28 | 2004-03-09 | Celanese Ventures Gmbh | Spherical microparticles containing linear polysaccharides |
FR2774383A1 (en) * | 1998-02-02 | 1999-08-06 | Rhodia Chimie Sa | WATER REDISPERSABLE PULVERULENT COMPOSITION BASED ON FILMOGENIC POLYMER AND AT LEAST ONE POLYPEPTIDE |
US6593470B1 (en) | 1998-08-28 | 2003-07-15 | Celanese Ventures Gmbh | Method for the production of small spherical particles containing at least one water-insoluble linear polysaccharide |
DE19839214C1 (en) * | 1998-08-28 | 2000-05-25 | Aventis Res & Tech Gmbh & Co | Process for the production of spherical microparticles with a smooth surface which consist wholly or partly of at least one water-insoluble linear polysaccharide, and microparticles obtainable by this process and their use |
WO2000012589A1 (en) * | 1998-08-28 | 2000-03-09 | Celanese Ventures Gmbh | Method for the production of small spherical particles containing at least one water-insoluble linear polysaccharide |
US6632671B2 (en) | 2000-02-28 | 2003-10-14 | Genesegues, Inc. | Nanoparticle encapsulation system and method |
WO2001080835A1 (en) * | 2000-04-24 | 2001-11-01 | Tanabe Seiyaku Co., Ltd. | Process for producing microsphere |
EP1728814A1 (en) | 2005-05-30 | 2006-12-06 | Gkss-Forschungszentrum Geesthacht Gmbh | Process for the preparation of nanoparticles making use of porous membranes |
EP2623542A4 (en) * | 2010-09-28 | 2014-08-20 | Toray Industries | Polymer microparticles and process for production thereof |
EP2623542A1 (en) * | 2010-09-28 | 2013-08-07 | Toray Industries, Inc. | Polymer microparticles and process for production thereof |
US9080048B2 (en) | 2010-09-28 | 2015-07-14 | Toray Industries, Inc. | Polymer microparticles and process for production thereof |
KR101833577B1 (en) | 2010-09-28 | 2018-04-13 | 도레이 카부시키가이샤 | Process for production of polymer microparticles |
US10987308B2 (en) | 2014-09-03 | 2021-04-27 | Genesegues, Inc. | Therapeutic nanoparticles and related compositions, methods and systems |
US11548999B2 (en) | 2019-07-10 | 2023-01-10 | Dainichiseika Color & Chemicals Mfg. Co., Ltd. | Method for manufacturing resin beads, resin beads, and product employing resin beads |
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Also Published As
Publication number | Publication date |
---|---|
FI885767A0 (en) | 1988-12-13 |
EP0363549A1 (en) | 1990-04-18 |
DK698688D0 (en) | 1988-12-15 |
GR3006969T3 (en) | 1993-06-30 |
JPH01502991A (en) | 1989-10-12 |
CA1340020C (en) | 1998-09-01 |
NO174208B (en) | 1993-12-20 |
FI885767A (en) | 1988-12-13 |
ATE84806T1 (en) | 1993-02-15 |
IE881026L (en) | 1988-10-16 |
FI96219B (en) | 1996-02-15 |
AU610594B2 (en) | 1991-05-23 |
DE3877678T2 (en) | 1993-10-07 |
FI96219C (en) | 1996-05-27 |
DE3877678D1 (en) | 1993-03-04 |
DK698688A (en) | 1988-12-15 |
AU1680688A (en) | 1988-11-04 |
ES2035949T3 (en) | 1993-05-01 |
NO885570D0 (en) | 1988-12-15 |
JP2564386B2 (en) | 1996-12-18 |
EP0363549B1 (en) | 1992-12-09 |
EP0309527A1 (en) | 1989-04-05 |
NO174208C (en) | 1994-03-30 |
BR8806902A (en) | 1989-10-31 |
DK173005B1 (en) | 1999-11-01 |
US4968350A (en) | 1990-11-06 |
NO885570L (en) | 1989-02-14 |
EP0309527B1 (en) | 1993-01-20 |
IE62111B1 (en) | 1994-12-14 |
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