US20010053829A1 - Continuous, solvent-free process for making copolymers of maleic anhydride and C1-4 alkyl vinyl ether - Google Patents
Continuous, solvent-free process for making copolymers of maleic anhydride and C1-4 alkyl vinyl ether Download PDFInfo
- Publication number
- US20010053829A1 US20010053829A1 US09/861,044 US86104401A US2001053829A1 US 20010053829 A1 US20010053829 A1 US 20010053829A1 US 86104401 A US86104401 A US 86104401A US 2001053829 A1 US2001053829 A1 US 2001053829A1
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- United States
- Prior art keywords
- vinyl ether
- alkyl vinyl
- solvent
- reactor
- maleic anhydride
- 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.)
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/02—Polymerisation in bulk
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
- C08F216/14—Monomers containing only one unsaturated aliphatic radical
- C08F216/16—Monomers containing no hetero atoms other than the ether oxygen
- C08F216/18—Acyclic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Definitions
- This invention relates to copolymers of maleic anhydride and a C 1 -C 4 alkyl vinyl ether, and, more particularly, to a continuous, solvent-free process for making solvent-free, fine white powders of such copolymers having advantageous properties useful for oral care compositions.
- excess AVE monomer is present over a 1:1 molar ratio of monomers, to function both as reactant and solvent in the system. No other solvent is present in the reactor. Accordingly, after stripping the excess AVE from the reaction product, a solvent-free copolymer is obtained.
- a batch process requires an extended amount of time to effect the reaction, usually necessitating about 9-13 hours to complete each batch.
- the process herein comprises feeding continuously alkyl vinyl ether as monomer reactant and solvent in excess of the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, at predetermined feeding rates, into a reactor heated at a reaction temperature of about 50° to 100° C., charging the reactor and withdrawing reaction product, residual alkyl vinyl ether and initiator from the reactor at the same rate as the feed rate of reactants into the reactor simultaneously thereby maintaining a constant volume in the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor.
- the alkyl vinyl ether is methyl vinyl ether
- the mole ratio of methyl vinyl ether to molten maleic anhydride is about 25:1 to 5:1, most preferably 12:1 to 7:1.
- the initiator concentration is 0.01 to 0.2% based on the weight of copolymer
- the % copolymer solids removed from the polymerization reactor is about 10 to 40%.
- FIGURE is a schematic drawing for making solvent-free copolymers of maleic anhydride (MAN) and C 1-4 alkyl vinyl ethers (AVE) by a continuous, solvent-free process.
- the continuous solvent-free process of the invention consists of the solvent feed system 100 , the molten maleic anhydride feed system 200 , the catalyst or initiator feed system 300 , the reactor system 400 , the product recovery and drier systems 500 and 600 , and the solvent recovery system 700 and 800 .
- the average residence time* of the monomers in the reactor system should be sufficient to completely react MAN, e.g. from 0.5 to 5 hours.
- higher temperature and/or initiator booster can be used at the end of reaction zone.
- the specific viscosity (SV) of the copolymer is controlled by adding a chain transfer agent, preferably acetaldehyde, to the AVE and/or by controlling the reaction temperature and/or the amount of initiator.
- the liquified solvent monomer (methyl vinyl ether) is pressurized and fed at a constant flow to the reactor system 400 which may consist of a Continuous Stirred Tank Reactor (CSTR) or of two or more CSTRs in series, or an agitated back mixed reactor, or a plug flow tubular reactor, which is maintained at a constant temperature between about 40° C. to 120° C., preferably 60-90° C.
- Molten maleic anhydride (MAN) in 200 , also pressurized, is fed and mixed well with the solvent monomer at a constant rate in the reactor; where, with a constant addition of an initiator having a half-life of 2 to 10 hours, e.g.
- lauroyl or decanoyl peroxide (or any other radical initiator) from 300 can rapidly react to form a slurry of the desired solid product (10-40% by weight) in the excess of liquid solvent monomer.
- the molar ratio of AVE/MAN in the reactor is about 25:1 to 5:1, preferably about 12:1 to 7:1.
- the slurry mixture is continually withdrawn and fed to a low pressure drier system 500 ; where, with the addition of heat, the excess solvent monomer is vaporized and the solid product is separated and removed. The recovered monomer is then cooled and re-pressurized in the recovery system 800 . Following compositional adjustments, the monomer solvent is returned to the solvent feed system 100 .
- AVE may be separated from polymer by continuous drying or by filtration, and recycled after continuous purification e.g. by continuous distillation, washing with water of pH>9, and drying.
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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)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
- This application is a continuation-in-part of pending U.S. patent application Ser. No. 09/596,297, filed Jun. 15, 2000.
- This invention is related to U.S. Pat. Nos. 5,959,053 and 5,939,506 assigned to the same assignee as herein.
- 1. Field of the Invention
- This invention relates to copolymers of maleic anhydride and a C1-C4 alkyl vinyl ether, and, more particularly, to a continuous, solvent-free process for making solvent-free, fine white powders of such copolymers having advantageous properties useful for oral care compositions.
- 2. Description of the Prior Art
- A batch, solvent-free process (i.e. no solvent other than reactants themselves) for making fine powders of high molecular alternating copolymers of maleic anhydride (MAN) and a C1-C4 alkyl vinyl ether (AVE) having a molecular structure of (A-B)n where A=MAN, B=AVE and n is an integer which is indicative of its molecular weight, is described in U.S. Pat. Nos. 5,959,053 and 5,939,506. In such process, excess AVE monomer is present over a 1:1 molar ratio of monomers, to function both as reactant and solvent in the system. No other solvent is present in the reactor. Accordingly, after stripping the excess AVE from the reaction product, a solvent-free copolymer is obtained. However, a batch process requires an extended amount of time to effect the reaction, usually necessitating about 9-13 hours to complete each batch.
- Accordingly, it is an object of this invention to provide a continuous, solvent-free process for making solvent-free, fine white powders of copolymers of MAN and AVE having advantageous properties useful for oral care compositions.
- What is described herein is a continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating copolymers of maleic anhydride and a C1-C4 alkyl vinyl ether, without odor or taste, having the molecular structure (A-B)n, where A is maleic anhydride, B is an alkyl vinyl ether, and n is an integer indicative of the molecular weight of the copolymer. The process herein comprises feeding continuously alkyl vinyl ether as monomer reactant and solvent in excess of the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, at predetermined feeding rates, into a reactor heated at a reaction temperature of about 50° to 100° C., charging the reactor and withdrawing reaction product, residual alkyl vinyl ether and initiator from the reactor at the same rate as the feed rate of reactants into the reactor simultaneously thereby maintaining a constant volume in the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor.
- In the preferred embodiments of the continuous solvent-free process of the invention, the alkyl vinyl ether is methyl vinyl ether, the mole ratio of methyl vinyl ether to molten maleic anhydride is about 25:1 to 5:1, most preferably 12:1 to 7:1. The initiator concentration is 0.01 to 0.2% based on the weight of copolymer, and the % copolymer solids removed from the polymerization reactor is about 10 to 40%.
- Referring now to the FIGURE, which is a schematic drawing for making solvent-free copolymers of maleic anhydride (MAN) and C1-4 alkyl vinyl ethers (AVE) by a continuous, solvent-free process. The continuous solvent-free process of the invention consists of the
solvent feed system 100, the molten maleicanhydride feed system 200, the catalyst orinitiator feed system 300, thereactor system 400, the product recovery anddrier systems solvent recovery system - The average residence time* of the monomers in the reactor system should be sufficient to completely react MAN, e.g. from 0.5 to 5 hours. To ensure complete reaction of MAN, higher temperature and/or initiator booster can be used at the end of reaction zone. The specific viscosity (SV) of the copolymer is controlled by adding a chain transfer agent, preferably acetaldehyde, to the AVE and/or by controlling the reaction temperature and/or the amount of initiator.
- In
system 100, the liquified solvent monomer (methyl vinyl ether) is pressurized and fed at a constant flow to thereactor system 400 which may consist of a Continuous Stirred Tank Reactor (CSTR) or of two or more CSTRs in series, or an agitated back mixed reactor, or a plug flow tubular reactor, which is maintained at a constant temperature between about 40° C. to 120° C., preferably 60-90° C. Molten maleic anhydride (MAN), in 200, also pressurized, is fed and mixed well with the solvent monomer at a constant rate in the reactor; where, with a constant addition of an initiator having a half-life of 2 to 10 hours, e.g. lauroyl or decanoyl peroxide (or any other radical initiator) from 300, can rapidly react to form a slurry of the desired solid product (10-40% by weight) in the excess of liquid solvent monomer. In this continuous process, the molar ratio of AVE/MAN in the reactor is about 25:1 to 5:1, preferably about 12:1 to 7:1. - With the maintenance of a constant volume in the reactor, the slurry mixture is continually withdrawn and fed to a low
pressure drier system 500; where, with the addition of heat, the excess solvent monomer is vaporized and the solid product is separated and removed. The recovered monomer is then cooled and re-pressurized in therecovery system 800. Following compositional adjustments, the monomer solvent is returned to thesolvent feed system 100. - AVE may be separated from polymer by continuous drying or by filtration, and recycled after continuous purification e.g. by continuous distillation, washing with water of pH>9, and drying.
- While the invention has been described with particular reference to certain embodiments thereof, it will be understood that changes and modifications may be made which are within the skill of the art. Accordingly, it is intended to be bound only by the following claims, in which:
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/861,044 US6451944B2 (en) | 2000-06-15 | 2001-05-18 | Continuous, solvent-free process for making copolymers of maleic anhydride and C1−4 alkyl vinyl ether |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59629700A | 2000-06-15 | 2000-06-15 | |
US09/861,044 US6451944B2 (en) | 2000-06-15 | 2001-05-18 | Continuous, solvent-free process for making copolymers of maleic anhydride and C1−4 alkyl vinyl ether |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US59629700A Continuation-In-Part | 2000-06-15 | 2000-06-15 |
Publications (2)
Publication Number | Publication Date |
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US20010053829A1 true US20010053829A1 (en) | 2001-12-20 |
US6451944B2 US6451944B2 (en) | 2002-09-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/861,044 Expired - Lifetime US6451944B2 (en) | 2000-06-15 | 2001-05-18 | Continuous, solvent-free process for making copolymers of maleic anhydride and C1−4 alkyl vinyl ether |
Country Status (8)
Country | Link |
---|---|
US (1) | US6451944B2 (en) |
EP (1) | EP1299425B1 (en) |
JP (1) | JP4820044B2 (en) |
CN (1) | CN1232541C (en) |
AT (1) | ATE306505T1 (en) |
AU (1) | AU2001257480A1 (en) |
DE (1) | DE60114009T2 (en) |
WO (1) | WO2001096410A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107805290A (en) * | 2017-12-05 | 2018-03-16 | 博爱新开源制药股份有限公司 | A kind of tert-Butyl vinyl ether/copolymer-maleic anhydride and preparation method thereof |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6365691B1 (en) * | 2000-07-06 | 2002-04-02 | Isp Investments Inc. | Continuous, solvent-free process for making terpolymers of maleic anhydride, C1-4 alkyl vinyl ether and isobutylene |
US6692725B2 (en) * | 2001-02-19 | 2004-02-17 | Daicel Chemical Industries, Ltd. | Composition for oral care |
FR2884253B1 (en) * | 2005-04-08 | 2007-06-22 | Univ Lille Sciences Tech | FUNCTIONALIZABLE MONOLITHIC MATERIALS |
CN102030856B (en) * | 2009-09-25 | 2012-05-30 | 博爱新开源制药股份有限公司 | Method for devolatilizing vinyl methyl ether/maleic anhydride copolymer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3108100A1 (en) * | 1981-03-04 | 1982-09-16 | Basf Ag, 6700 Ludwigshafen | METHOD FOR THE PRODUCTION OF COPOLYMERISATEN OF MALEINSAEUREANHYDRID |
DE3712265A1 (en) * | 1987-04-10 | 1988-10-20 | Giulini Chemie | METHOD FOR PRODUCING HIGH POLYMERIZATION COPOLYMERS |
US5034488A (en) * | 1990-01-11 | 1991-07-23 | Gaf Chemicals Corporation | Slurry polymerization of crosslinked maleic anhydride-alkyl vinyl ether copolymers in a solvent system comprising a carboxylic acid ester and a saturated hydrocarbon |
US5064897A (en) * | 1990-08-30 | 1991-11-12 | Isp Investments Inc. | Process for making ethanol solutions of alkyl half-esters of copolymers of maleic anhydride and a C1 -C4 alkyl vinyl ether |
US5874510A (en) * | 1997-09-18 | 1999-02-23 | Isp Investments Inc. | Process for making crosslinked copolymers of maleic anhydride and methyl vinyl ether |
US5939506A (en) * | 1997-10-02 | 1999-08-17 | Isp Investments Inc. | Solvent-free process for making high molecular weight terpolymers of maleic anhydride, C1 -C4 alkyl vinyl ether and isobutylene |
-
2001
- 2001-05-02 DE DE60114009T patent/DE60114009T2/en not_active Expired - Lifetime
- 2001-05-02 EP EP01930999A patent/EP1299425B1/en not_active Expired - Lifetime
- 2001-05-02 CN CNB018112056A patent/CN1232541C/en not_active Expired - Fee Related
- 2001-05-02 JP JP2002510545A patent/JP4820044B2/en not_active Expired - Fee Related
- 2001-05-02 AU AU2001257480A patent/AU2001257480A1/en not_active Abandoned
- 2001-05-02 AT AT01930999T patent/ATE306505T1/en not_active IP Right Cessation
- 2001-05-02 WO PCT/US2001/014112 patent/WO2001096410A1/en active IP Right Grant
- 2001-05-18 US US09/861,044 patent/US6451944B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107805290A (en) * | 2017-12-05 | 2018-03-16 | 博爱新开源制药股份有限公司 | A kind of tert-Butyl vinyl ether/copolymer-maleic anhydride and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
JP4820044B2 (en) | 2011-11-24 |
WO2001096410A1 (en) | 2001-12-20 |
JP2004503617A (en) | 2004-02-05 |
EP1299425B1 (en) | 2005-10-12 |
EP1299425A4 (en) | 2004-10-27 |
DE60114009D1 (en) | 2006-02-23 |
CN1443202A (en) | 2003-09-17 |
CN1232541C (en) | 2005-12-21 |
EP1299425A1 (en) | 2003-04-09 |
AU2001257480A1 (en) | 2001-12-24 |
US6451944B2 (en) | 2002-09-17 |
ATE306505T1 (en) | 2005-10-15 |
DE60114009T2 (en) | 2006-06-22 |
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