EP4326706A1 - Verfahren zur herstellung von carbodiimiden - Google Patents
Verfahren zur herstellung von carbodiimidenInfo
- Publication number
- EP4326706A1 EP4326706A1 EP22722231.2A EP22722231A EP4326706A1 EP 4326706 A1 EP4326706 A1 EP 4326706A1 EP 22722231 A EP22722231 A EP 22722231A EP 4326706 A1 EP4326706 A1 EP 4326706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substituted
- alkyl
- carbodiimide
- distillation
- alcohol
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C267/00—Carbodiimides
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/09—Processes comprising oligomerisation of isocyanates or isothiocyanates involving reaction of a part of the isocyanate or isothiocyanate groups with each other in the reaction mixture
- C08G18/095—Processes comprising oligomerisation of isocyanates or isothiocyanates involving reaction of a part of the isocyanate or isothiocyanate groups with each other in the reaction mixture oligomerisation to carbodiimide or uretone-imine groups
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/02—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only
- C08G18/025—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only the polymeric products containing carbodiimide groups
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
- C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
- C08G18/0847—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers
- C08G18/0852—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers the solvents being organic
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/166—Catalysts not provided for in the groups C08G18/18 - C08G18/26
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/2815—Monohydroxy compounds
- C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
- C08G18/2825—Alkanols, cycloalkanols or arylalkanols including terpenealcohols having at least 6 carbon atoms
Definitions
- the invention relates to a new process for preparing carbodiimides with a reduced residual isocyanate monomer content.
- Carbodiimides have proven themselves in many applications, e.g. as hydrolysis inhibitors for thermoplastics, polyols, polyurethanes, triglycerides and lubricating oils etc.
- the carbodiimides are usually synthesized starting from isocyanates which are carbodiimidized by basic or heterocyclic catalysis with elimination of CO2.
- mono- or polyfunctional isocyanates can be converted into monomeric or polymeric carbodiimides.
- alkali metal or alkaline earth metal compounds as well as heterocyclic compounds containing phosphorus, are used as catalysts.
- Corresponding cata- factors are, for example, in Angew. Chem. 1962, 74, 801-806 and Angew. Chem. 1981, 93, 855-866.
- the object of the present invention was therefore to provide an improved process for the preparation of carbodiimides with a reduced isocyanate content which largely avoids the above disadvantages of the prior art and enables high yields with economic feasibility and high product quality.
- R M ,R m are identical or independently of one another and are CrC 24 -alkyl and/or C 5 -C 24 -cyclo- or C 1 -C 2 -alkyl-substituted or C 1 -C 24 -oxyalkyl-substituted cycloalkyl, C 1 -C 12 - Alkyl-substituted or Ci-C 24 -oxyalkyl-substituted aryls, CyCis-alkylaryl-substituted aryls and optionally for Ci-Ci 2 -alkyl-substituted aryls bridged via C Cs - alkylene groups, which have a total of 8 to 30 carbon atoms, and aryl, comprising the following steps: a) carbodiimidization of isocyanates in the presence of a catalyst to form a reaction mixture containing carbodiimide and monomeric isocyanate, b) at least partial removal of the catalyst and
- the isocyanates used in step a) are monomeric compounds of the formulas OCN-R'-
- OCN-R M and OCN-R' are used.
- step a compounds of the formula
- the compounds of the formula OCN-R'-NCO are used in step a) in an already oligomerized or polymerized form and in a form that is already terminated at one end.
- Ci-Ci 2 -alkyl-substituted via alkylene bridged Ce-Cio-arylenes which have a total of 8 to 30 carbon atoms, have the general structure -alkylene-arylene-alkylene-, where the alkylenes can be linear or branched and the Arylene group may have up to four CrCi 2 -alkyl substituents, provided that the total number of carbon atoms is not more than 30.
- R ' is Ci-Ci 2 -alkyl-substituted C 6 -C 12 - arylenes, preferably for Ci-C 4 -alkyl-substituted C 6 -Ci 2 -arylenes, particularly preferably for one to three times Ci -C 4 -alkyl-substituted C 6 -arylenes, and very particularly preferably di- and/or triisopropylphenylene.
- R" and R IM independently of one another are C.sub.1 -C.sub.2 -alkyl- substituted C.sub.6 -C.sub.2 -aryls, preferably C.sub.1 -C.sub.4 -alkyl -substituted C.sub.6 -C.sub.12 -aryls, particularly preferably for mono- to tri-C 4 -alkyl-substituted C 6 -aryls, and very particularly preferably di- and / or triisopropylphenyl.
- R ' is Ci-Ci 2 -alkyl-substituted C 6 -C 12 - arylene and R" and R m independently for Ci-Ci 2 -alkyl-substituted C 6 -C 12 - aryls.
- R' represents Ci-C 4 -alkyl-substituted C 6 -C 12 -arylenes and R" and R IM independently represent Ci-C 4 -alkyl-substituted C 6 -Ci 2 -aryls.
- R' represents mono- to tri-C 4 -alkyl-substituted C 6 -arylenes and R" and R IM independently of one another mono- to tri-C 1 -C 4 -alkyl-substituted C 6 -aryls.
- R′ represents di- and/or triisopropylphenylene and R′′ and R IM independently of one another represent di- and/or triisopropylphenyl.
- the carbodiimides correspond to the formula (II), in the
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are H, CrC 2 o-alkyl, C 3 -C 20 - cycloalkyl, C6-Cis-aryl and/or CyCis-aralkyl,
- R 7 Ci-Cis-alkylene, Cs-Cis-cycloalkylene, Ci-C2o-alkyl-substituted arylene and/or C 7 -C 18 - aralkylene, preferably Ci-Cs-alkyl-substituted arylene and/or C 7 -C 18 - aralkylene, and n is a number ranging from 1 to 500.
- n is preferably a number in the range from 1 to 50, preferably from 3 to 20.
- step a) of the process according to the invention typically takes place in a condensation reaction with elimination of CO2, as described, for example, in Angew. Chem. 93, pp. 855 - 866 (1981) or DE-A-11 30594 or Tetrahedron Leiters 48 (2007), pp. 6002 - 6004.
- the carbodiimidization can be carried out either in bulk or in a solvent. It is also possible first to start the carbodiimidization in bulk and to add a solvent during the reaction. Suitable solvents can easily be determined by a person skilled in the art. Examples of such solvents are petroleum ether, benzene and/or alkylbenzenes.
- the isocyanates used are particularly preferably 1,3,5-triisopropylphenyl diisocyanate (TRI DI), 2,6-diisopropylphenyl isocyanate (DIPI) or 2,4,6-triisopropylphenyl isocyanate (TRI PI).
- TRI DI 1,3,5-triisopropylphenyl diisocyanate
- DIPI 2,6-diisopropylphenyl isocyanate
- TRI PI 2,4,6-triisopropylphenyl isocyanate
- strong bases or phosphorus compounds are preferred as catalysts for the carbodiimidization of the isocyanates to form carbodiimides of the formula (I) in step a). Preference is given to using phospholene oxides, phospholidines or phospholine oxides and the corresponding sulfides.
- tertiary amines basic metal compounds, alkali metal or alkaline earth metal compounds, alkali metal oxides or hydroxides, alcoholates or phenolates, carboxylic acid metal salts and non-basic organometallic compounds can be used as catalysts.
- a catalyst are particularly alkyl phospholene oxides such. B. methylphospholene oxide preferred.
- the reaction is preferably carried out in a temperature range from 140.degree. C. to 200.degree. C., particularly preferably from 160.degree. C. to 180.degree.
- reaction product from step a) is filtered between step a) and step b).
- the at least partial removal of the catalyst and/or monomeric isocyanate in step b) is intended to remove most of these substances. Taking process efficiency into account, it is accepted that the monomeric isocyanate is not completely separated off. The separation can take place by distillation or extraction, with preference being given to distillation. Any solvent used in the carbodiimidization can also be easily removed during the distillation.
- the distillation in step b) is preferably carried out at temperatures from 140.degree. C. to 200.degree. C., particularly preferably at 160.degree. C.-180.degree. It is generally carried out under reduced pressure at a pressure of 0.1 to 50 mbar, preferably 1-30 mbar, particularly preferably 10-20 mbar. In a preferred embodiment, the distillation is carried out batchwise in a stirred reactor.
- the addition and/or reaction of the alcohol in step c) preferably takes place at temperatures of from 140.degree. C. to 200.degree. C., particularly preferably from 160.degree. C. to 180.degree. Both the addition and the reaction of the alcohol in step c) particularly preferably take place at temperatures in the range from 140°C to 200°C, most preferably from 160°C to 180°C.
- step c) based on the amount of carbodiimide present, 0.1-5% by weight, preferably 0.2-2% by weight, particularly preferably 0.3-0.5% by weight, of alcohol(s) are added ) admitted.
- the alcohols used are preferably aliphatic and/or aromatic alcohols, preferably linear, branched and/or cyclic aliphatic C6-C18 alcohols, particularly preferably n-octanol, iso-octanol, dodecanol, 2-ethylhexanol, oleyl alcohol, stearyl alcohol and/or cyclohexanol .
- step c a distillation can be carried out in order to remove any excess alcohol that may be present.
- the carbodiimides obtained by the process according to the invention typically have a monomeric isocyanate content of less than 1000 ppm, preferably less than 750 ppm, particularly preferably less than 500 ppm, more preferably less than 300 ppm and most preferably less than 100 ppm.
- the residual isocyanate monomer content was determined by HPLC after reaction with a reagent solution (1-pyrdiyl-2-piperazine in 100 ml THF). A mixture of ammonium acetate solution and methanol was used as the eluent. In advance, calibration was carried out with different concentrations of the monomeric isocyanate.
- the carbodiimide from Example 1 was distilled in a stainless steel kettle over a short distillation head for 5 h.
- the temperatures in the distillation kettle were in a range from 160° C. to 180° C., the final pressure was around 10 mbar.
- Example 3 Distillation via thin-layer / short-path evaporator
- the carbodiimide from Example 1 was distilled using a thin-layer/short-path evaporator combination at about 180° C. and 1 mbar.
- the carbodiimide from Example 1 was dissolved in toluene at 60° C. in a stainless steel vessel and then recrystallized in acetone at 10-20° C. After the filtration, the pulverulent carbodiimide was dried for several hours in a dryer at a reduced pressure of 10 mbar.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21169385.8A EP4079722A1 (de) | 2021-04-20 | 2021-04-20 | Verfahren zur herstellung von carbodiimiden |
| PCT/EP2022/059638 WO2022223352A1 (de) | 2021-04-20 | 2022-04-11 | Verfahren zur herstellung von carbodiimiden |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4326706A1 true EP4326706A1 (de) | 2024-02-28 |
Family
ID=75625336
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21169385.8A Withdrawn EP4079722A1 (de) | 2021-04-20 | 2021-04-20 | Verfahren zur herstellung von carbodiimiden |
| EP22722231.2A Pending EP4326706A1 (de) | 2021-04-20 | 2022-04-11 | Verfahren zur herstellung von carbodiimiden |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21169385.8A Withdrawn EP4079722A1 (de) | 2021-04-20 | 2021-04-20 | Verfahren zur herstellung von carbodiimiden |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20240209136A1 (de) |
| EP (2) | EP4079722A1 (de) |
| JP (1) | JP7776528B2 (de) |
| KR (1) | KR20230172020A (de) |
| CN (1) | CN117222619A (de) |
| AU (1) | AU2022260398B2 (de) |
| BR (1) | BR112023021881A2 (de) |
| CA (1) | CA3216684A1 (de) |
| MX (1) | MX2023012439A (de) |
| TW (1) | TW202308987A (de) |
| WO (1) | WO2022223352A1 (de) |
| ZA (1) | ZA202310679B (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1130594B (de) | 1956-07-30 | 1962-05-30 | Du Pont | Verfahren zur Herstellung von gegebenenfalls modifizierten Polykondensationsprodukten mití¬N?C?N-Brueckengliedern |
| DE4126359A1 (de) * | 1991-08-09 | 1993-02-11 | Basf Ag | Oligomere carbodiimide |
| US5504241A (en) * | 1994-05-12 | 1996-04-02 | Basf Aktiengesellschaft | Carbodiimides and/or oligomeric polycarbodiimides based on 1,3-bis(1-methyl-1-isocyanatoethyl)benzene, their preparation, and their use as hydrolysis stabilizers |
| JP3509084B2 (ja) * | 1995-02-17 | 2004-03-22 | 日本ポリウレタン工業株式会社 | 2,6−ジイソプロピルフェニルカルボジイミドの精製法 |
| JP3951065B2 (ja) * | 1995-10-04 | 2007-08-01 | 日清紡績株式会社 | ジシクロヘキシルカルボジイミドの製造方法 |
| JPH09221532A (ja) * | 1995-12-12 | 1997-08-26 | Shin Etsu Chem Co Ltd | ポリカルボジイミド誘導体及びその製造方法 |
| JP3388990B2 (ja) * | 1996-03-14 | 2003-03-24 | 日清紡績株式会社 | 不飽和ポリエステル樹脂用の耐加水分解安定剤及び該耐加水分解安定剤による不飽和ポリエステル樹脂の耐加水分解安定化方法 |
| JP4096080B2 (ja) * | 2001-11-27 | 2008-06-04 | ビーエーエスエフ ソシエタス・ヨーロピア | イソシアナート基とウレタン基とを含むプレポリマーの製造方法 |
| KR20120018796A (ko) * | 2009-05-15 | 2012-03-05 | 라인 케미 라이나우 게엠베하 | 카르보디이미드의 제조 방법 |
| BR112015006038A2 (pt) * | 2012-09-19 | 2017-07-04 | Basf Se | processo para produzir uma policarbodiimida e policarbodiimida |
| WO2014044742A1 (en) * | 2012-09-19 | 2014-03-27 | Basf Se | Process for the purification of a polycarbodiimide |
| EP2803660A1 (de) * | 2013-05-13 | 2014-11-19 | Rhein Chemie Rheinau GmbH | Neue Carbodiimide mit endständigen Harnstoff- und/oder Urethangruppen, Verfahren zu deren Herstellung und deren Verwendung |
| PL3728184T3 (pl) * | 2017-12-20 | 2022-02-28 | Lanxess Deutschland Gmbh | Sposób wytwarzania karbodiimidów |
-
2021
- 2021-04-20 EP EP21169385.8A patent/EP4079722A1/de not_active Withdrawn
-
2022
- 2022-04-11 EP EP22722231.2A patent/EP4326706A1/de active Pending
- 2022-04-11 CA CA3216684A patent/CA3216684A1/en active Pending
- 2022-04-11 KR KR1020237039650A patent/KR20230172020A/ko active Pending
- 2022-04-11 WO PCT/EP2022/059638 patent/WO2022223352A1/de not_active Ceased
- 2022-04-11 JP JP2023561069A patent/JP7776528B2/ja active Active
- 2022-04-11 CN CN202280029395.0A patent/CN117222619A/zh active Pending
- 2022-04-11 MX MX2023012439A patent/MX2023012439A/es unknown
- 2022-04-11 AU AU2022260398A patent/AU2022260398B2/en active Active
- 2022-04-11 US US18/287,720 patent/US20240209136A1/en active Pending
- 2022-04-11 BR BR112023021881A patent/BR112023021881A2/pt active Search and Examination
- 2022-04-18 TW TW111114609A patent/TW202308987A/zh unknown
-
2023
- 2023-11-17 ZA ZA2023/10679A patent/ZA202310679B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022223352A1 (de) | 2022-10-27 |
| AU2022260398B2 (en) | 2025-03-27 |
| MX2023012439A (es) | 2023-11-07 |
| AU2022260398A1 (en) | 2023-11-30 |
| JP2024511889A (ja) | 2024-03-15 |
| CA3216684A1 (en) | 2022-10-27 |
| KR20230172020A (ko) | 2023-12-21 |
| TW202308987A (zh) | 2023-03-01 |
| BR112023021881A2 (pt) | 2023-12-19 |
| JP7776528B2 (ja) | 2025-11-26 |
| CN117222619A (zh) | 2023-12-12 |
| US20240209136A1 (en) | 2024-06-27 |
| EP4079722A1 (de) | 2022-10-26 |
| ZA202310679B (en) | 2024-08-28 |
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