EP4017899A1 - Verfahren zur herstellung von polyethercarbonatalkoholen - Google Patents
Verfahren zur herstellung von polyethercarbonatalkoholenInfo
- Publication number
- EP4017899A1 EP4017899A1 EP20751582.6A EP20751582A EP4017899A1 EP 4017899 A1 EP4017899 A1 EP 4017899A1 EP 20751582 A EP20751582 A EP 20751582A EP 4017899 A1 EP4017899 A1 EP 4017899A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbonate
- catalyst
- functional starter
- polyether
- starter substance
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/20—General preparatory processes
- C08G64/30—General preparatory processes using carbonates
- C08G64/305—General preparatory processes using carbonates and alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/20—General preparatory processes
- C08G64/30—General preparatory processes using carbonates
Definitions
- the present invention relates to a process for the production of polyether carbonate alcohols, preferably polyether carbonate polyols, by the catalytic addition of cyclic propylene carbonate (cPC) to an H-functional starter substance.
- cPC cyclic propylene carbonate
- cyclic carbonates such as cyclic propylene carbonate can be used as monomers in the manufacture of polycarbonate polyols.
- This reaction is based on a transesterification and is carried out in the presence of catalysts such as titanium compounds such as titanium dioxide or titanium tetrabutoxide (EP 0 343 572), tin compounds such as tin dioxide or dibutyltin oxide (DE 2 523 352), or alkali metal carbonates or acetates ( DE 1 495 299 A1).
- catalysts such as titanium compounds such as titanium dioxide or titanium tetrabutoxide (EP 0 343 572), tin compounds such as tin dioxide or dibutyltin oxide (DE 2 523 352), or alkali metal carbonates or acetates ( DE 1 495 299 A1).
- the carbonates and alcohols used are incorporated alternately and thus alternating polycarbonate polyols are obtained.
- These alternating polycarbonate polyols do not contain any ether groups
- the ring-opening polymerization of cPC is, for example, by Soga et al. known ("K. Soga, Y. Tazuke, S. Hosada, S. Ikeda: Polymerization of Propylene Carbonate, J. Polym. Sci., 1977, 15, pp. 219-229").
- Soga et al. known
- the polymerization of cPC gives rise to undesired by-products containing double bonds, long reaction times of 72-100 hours and high temperatures being necessary for the polymerization
- G. Rokicki Aliphatic cyclic carbonates and spiroorthocarbonates as monomers, Prague. Polym. Sci., 2000, 25, pp. 259-342 ").
- the object on which the present invention is based was therefore to reduce the formation of by-products when using cyclic propylene carbonate as a monomer for the production of polyether carbonate alcohols. It has surprisingly been found that the technical object is achieved by a process for the preparation of polyether carbonate alcohols by addition of cyclic propylene carbonate onto an H-functional starter substance in the presence of a catalyst, characterized in that at least one compound according to the formula
- M is selected from the alkali metal cations Li + , Na + , K + and Cs + ,
- an H-functional starter substance and cyclic propylene carbonate can first be placed in the reactor. It is also possible for only a partial amount of the functional starter substance and / or a partial amount of cyclic propylene carbonate to be initially taken in the reactor. The amount of catalyst required for the ring-opening polymerization is then optionally added to the reactor. The order in which they are added is not critical.
- the reactor can also be filled first with the catalyst and then an H-functional starter substance and cyclic propylene carbonate. Alternatively, the catalyst can first be suspended in an H-functional starter substance and then the suspension can be filled into the reactor.
- the catalyst is preferably used in an amount such that the content of catalyst in the resulting reaction product is 10 to 50,000 ppm, particularly preferably 20 to 30,000 ppm and most preferably 50 to 20,000 ppm.
- the catalyst content is preferably determined by elemental analysis with optical emission spectrometry by means of inductively coupled plasmas (ICP-OES).
- the resulting mixture of (a) a portion of H-functional starter substance, (b) catalyst and (c) cyclic propylene carbonate is added at a temperature from 20 ° C to 120 ° C, particularly preferably from 40 ° C to 100 ° C inert gas (for example argon or nitrogen) introduced.
- inert gas for example argon or nitrogen
- the catalyst can be added in solid form or as a suspension in cyclic propylene carbonate, in a functional starter substance or in a mixture of the above.
- a portion of the bi-functional starter substances and cyclic propylene carbonate is initially introduced in a first step and, in a subsequent second step, the temperature of the portion of the H-functional starter substance and the cyclic propylene carbonate to 40 ° C to 120 ° C, preferably 40 ° Brought C to 100 ° C and / or the pressure in the reactor is reduced to less than 500 mbar, preferably 5 mbar to 100 mbar, where appropriate, a stream of inert gas (for example of argon or nitrogen) is applied and the catalyst to a portion of the H functional Starter substance is added in the first step or immediately thereafter in the second step.
- inert gas for example of argon or nitrogen
- the resulting reaction mixture is then heated at a temperature of 130 ° C to 230 ° C, preferably 140 ° C to 200 ° C, particularly preferably 160 ° C to 190 ° C, with an inert gas stream (for example of argon or nitrogen) if necessary can be passed through the reactor.
- the reaction is continued until no more gas evolution is observed at the set temperature.
- the reaction can also be carried out under pressure, preferably at a pressure of 50 mbar to 100 bar (absolute), particularly preferably 200 mbar to 50 bar (absolute), particularly preferably 500 mbar to 30 bar (absolute).
- the remaining amount of H-functional starter substance and / or cyclic propylene carbonate is metered into the reactor continuously. It is possible to meter in the cyclic propylene carbonate at a constant metering rate or to increase or decrease the metering rate gradually or gradually or to add the cyclic propylene carbonate in portions.
- the cyclic propylene carbonate is preferably added to the reaction mixture at a constant metering rate.
- the metering of the cyclic propylene carbonate or the H-functional starter substances can be carried out simultaneously or sequentially via separate meterings (additions) in each case or via one or more meterings, the H-functional starter substances being metered in individually or as a mixture.
- further cyclic carbonate in addition to the cyclic propylene carbonate, further cyclic carbonate can optionally be used in a proportion of at most 20% by weight, preferably at most 10% by weight, particularly preferably at most 5% by weight, based in each case on the sum of the total weight of cyclic carbonate.
- Ethylene carbonate is preferably used as a further cyclic carbonate.
- the polyether carbonate alcohols can be produced in a batch, semi-batch or continuous process.
- the polyether carbonate alcohols are preferably produced in a continuous process which comprises both continuous polymerization and continuous addition of the H-functional starter substance.
- the invention therefore also relates to a process in which egg-functional starter substance, cyclic propylene carbonate and catalyst are continuously metered into the reactor and the resulting reaction mixture (containing the reaction product) is continuously removed from the reactor.
- the catalyst is preferably added continuously suspended in H-functional starter substance.
- continuous can be defined as the mode of adding a relevant catalyst or reactant such that a substantially continuous effective concentration of the catalyst or reactants is maintained.
- the supply of the catalyst and the reactants can be carried out really continuously or in relatively closely spaced increments.
- a continuous addition of starter can be genuinely continuous or take place in increments. It would not deviate from the present method to add a catalyst or reactants incrementally in such a way that the concentration of the added materials falls essentially to zero for some time before the next incremental addition.
- the catalyst concentration be maintained at substantially the same concentration during the major part of the course of the continuous reaction and that initiator be present during the major part of the polymerization process.
- Suitable H-functional starter substances which can be used are compounds with H atoms active for the alkoxylation, which have a number average molecular weight according to DIN55672-1 up to 10,000 g / mol, preferably up to 5000 g / mol and particularly preferably up to 2500 g / mol.
- Groups with active H atoms which are active for the alkoxylation are, for example, -OH, -NH2 (primary amines), -NH- (secondary amines), -SH and -CO2H, preferred are -OH, -NH2 and -CO2H, particularly preferred -OH.
- one or more compounds are selected from the group consisting of mono- or polyhydric alcohols, polyhydric amines, polyhydric thiols, amino alcohols, thioalcohols, hydroxyesters, Polyether polyols, polyester polyols, polyester ether polyols, polyether carbonate polyols, poly carbonatpolyole, polycarbonates, polyethyleneimines, polyetheramines, Polytetrahydroogniane (z. B.
- PolyTHF ® of BASF Polytetrahydro
- Polyetherthiole polyacrylate polyols
- castor oil the mono- or di-glyceride of ricinoleic acid, monoglycerides of fatty acids, chemically modified mono-, di- and / or triglycerides of fatty acids, and C 1 -C 24 alkyl fatty acid esters, which contain on average at least 2 OH groups per molecule and water, are used.
- it is in the C 1 -C 24 alkyl fatty acid ester which contain OH-groups per molecule on average at least 2 to commercial products such as Lupranol Balance ® (Fa.
- Alcohols, amines, thiols and carboxylic acids can be used as monofunctional starter substances.
- the following can be used as monofunctional alcohols: methanol, ethanol, 1-propanol,
- Possible monofunctional amines are: butylamine, tert-butylamine, pentylamine, hexylamine, aniline, aziridine, pyrrolidine, piperidine, morpholine.
- carboxylic acids formic acid, acetic acid, propionic acid, butyric acid, acrylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, aromatic carboxylic acids such as benzoic acid, terephthalic acid, tetrahydrophthalic acid, phthalic acid or isophthalic acid, such as palmitic acid, fatty acids Linolenic acid.
- Polyhydric alcohols suitable as H-functional starter substance are, for example, dihydric alcohols (such as, for example, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,4-butanediol, 1,4-butenediol, 1,4-butynediol, neopentyl glycol, 1 , 5-pentanediol, methylpentanediols (such as 3-methyl-1,5-pentanediol), 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, bis (hydroxymethyl) - cyclohexanes (such as 1,4-bis (hydroxymethyl) cyclohexane, triethylene glycol, tetraethylene glycol, polyethylene glycols, dipropylene glycol
- the H-functional starter substance can also be selected from the substance class of polyether polyols which have a molecular weight M n according to DIN55672-1 in the range from 18 to 8000 g / mol and a functionality of 2 to 3. Preference is given to polyether polyols which are built up from repeating ethylene oxide and propylene oxide units, preferably with a proportion of 35 to 100% propylene oxide units, particularly preferably with a proportion of 50 to 100% propylene oxide units. These can be random copolymers, gradient copolymers, alternating or block copolymers of ethylene oxide and propylene oxide.
- the H-functional starter substance can also be selected from the substance class of polyester polyols. At least difunctional polyesters are used as polyester polyols. Polyester polyols preferably consist of alternating acid and alcohol units.
- the acid components used are, for example, succinic acid, maleic acid, maleic anhydride, adipic acid, phthalic anhydride, phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride or mixtures of the acids and / or anhydrides mentioned.
- As alcohol components for. B.
- ethanediol 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,4-bis (hydroxymethyl) cyclohexane, diethylene glycol, Dipropylene glycol, trimethylolpropane, glycerol, pentaerythritol or mixtures of the alcohols mentioned are used. If dihydric or polyhydric polyether polyols are used as the alcohol component, polyester ether polyols are obtained which can also serve as starter substances for the preparation of the polyether carbonate alcohols.
- polycarbonate diols can be used as H-functional starter substance, which are prepared, for example, by reacting phosgene, dimethyl carbonate, diethyl carbonate or diphenyl carbonate and difunctional alcohols or polyester polyols or polyether polyols.
- polycarbonates can be found e.g. B. in EP-A 1359177.
- polyether carbonate polyols can be used as H-functional starter substance.
- polyether carbonate polyols obtainable by the process according to the invention described here are used. These polyether carbonate polyols used as H-functional starter substances are prepared beforehand in a separate reaction step for this purpose.
- the H-functional starter substance generally has a functionality (i.e. number of H atoms active for the polymerization per molecule) of 1 to 8, preferably 1 to 3.
- the H-functional starter substance is used either individually or as a mixture of at least two H-functional starter substances.
- the H-functional starter substance is particularly preferably at least one compound selected from the group consisting of water, ethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol , 2-methylpropane-l, 3-diol, neopentyl glycol, 1,6-hexanediol, 1,8-octanediol, diethylene glycol, dipropylene glycol, glycerine, trimethylolpropane, Pentaerythritol, sorbitol, polyether carbonate polyols with a molecular weight M n according to DIN55672-1 in the range from 150 to 8000 g / mol with a functionality of 2 to 3 and polyether polyols with a molecular weight M n according to DIN55672-1 in the range from 150 to 8000 g / mol and
- the H-functional starter substance is preferably chosen such that a polyether carbonate polyol, i.e. a polyether carbonate alcohol with a functionality of 2 or more, is obtained as the polyether carbonate alcohol.
- the catalyst used is at least one compound according to the formula
- M is selected from the alkali metal cations Li + , Na + , K + and Cs + ,
- the anion X of the catalyst is preferably VO 3 or VO 4 3 .
- the alkali metal cation M used is Li +, Na + , K + or Cs + , particularly preferably K + or Cs + .
- Catalysts used for the invention are preferably LfiWCE, Na2W04, K2WO4, CS2WO4 , L12M0O4, Na 2 Mo0 4 , K2M0O4, CS2M0O4, Li3V0 4 , Na 3 V04, K 3 V0 4 , Cs 3 V0 4, L1VO3, NaV0 3 , KV0 3 and CSVO3, particularly preferably K3VO4, CS3VO4 , KVO3 and CsVCfi.
- polyether carbonate alcohols obtained by the process according to the invention can be processed further to form polyurethanes, for example by reaction with di- and / or polyisocyanates.
- detergent formulations such as for textile or surface cleaning, drilling fluids, fuel additives, ionic and non-ionic surfactants, dispersants, lubricants, process chemicals for paper or textile production, cosmetic formulations, such as in skin or sun protection cream or to find hair care products.
- the molecular weight M n of the resulting polyether carbonate alcohols was determined by means of gel permeation chromatography (GPC). The procedure was in accordance with DIN 55672-1 (March 2007): "Gel permeation chromatography, Part 1 - Tetrahydrofuran as eluent" and polystyrene samples with known molar mass were used for calibration.
- the proportion of incorporated CO2 in the resulting polyether carbonate alcohol (CCE content) was determined by means of 'H-NMR spectroscopy (Bruker, AV III HD 600, 600 MHz; pulse program zg30, waiting time dl: 10s, 64 scans). Each sample was dissolved in deuterated chloroform.
- the signals at 6.01-5.88 ppm and 5.37-5.10 ppm are used for formed olefinic (allyl alcohol / ether groups) (the sum of both corresponds to an integral of 3 protons).
- the remaining monomeric propylene carbonate (signal at 1.51-1.49 ppm) for carbon dioxide built into the polyether carbonate alcohol (resonances at 1.31-1.27 and possibly), polyether polyol (ie without built-in carbon dioxide) with resonances at 1.14 -1.10 ppm.
- F (1.51-1.49) area of the resonance at 1.51-1.49 ppm for cyclic carbonate (corresponds to 3
- F (1.31-1.27) area of the resonance at 1.31-1.27 ppm for polyether carbonate alcohol (corresponds to 3
- F (1.14-1.10) area of the resonance at 1.14-1.10 ppm for polyether polyol (corresponds to 3 protons)
- N (F (1.51-1.49) + F (1.51-1.49)) 102+ F (1.14-1.10) 58+ (F (6.01-5.88) + F (5.37-5.10)) * 44 (IV)
- the factor 102 results from the sum of the molar masses of CO2 (molar mass 44 g / mol) and that of propylene oxide (molar mass 58 g / mol).
- the factor 44 results from the molar mass of allyl alcohol (44 g / mol)
- the weight fraction (in% by weight) of CO2 in the polyether carbonate alcohol was calculated according to formula (V):
- Ammonium metavanadate (NH 4 VO3): AB CR> 99.9% Calcium metavanadate (Ca (V03) 2): AB CR 99.8% Sodium stannate trihydrate (Na2SnC> 3 3H2O): Sigma-Aldrich> 98%
- Example 1 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and NasVCü as catalyst
- a 500 mL four-necked glass flask was equipped with a reflux condenser, KPG stirrer, thermal sensor, nitrogen inlet and gas outlet / gas outlet with pressure relief valve. Then 200 g of cyclic propylene carbonate, 34.25 g of 1,6-hexanediol and 1.8 g of Na’.VCE were weighed out. 10 L / h of nitrogen was passed in for 30 minutes, the suspension being stirred at 300 rpm. The suspension was then gradually heated to 180 ° C. The resulting gas stream was drained through a bubble counter after the reflux condenser.
- the reaction mixture was kept at the set temperature until the evolution of gas came to a standstill.
- the CCE content built into the polyether carbonate alcohol, the olefin / allyl alcohol / ether content was determined by means of 'H-NMR spectroscopy using the methods described above.
- the molecular weight was determined by means of gel permeation chromatography.
- Example 2 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and K3VO4 as catalyst
- Example 3 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and CS3VO4 as catalyst
- Example 4 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and NaVCb as catalyst
- Example 5 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and KVO3 as catalyst
- Example 6 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and CsVCb as catalyst
- Example 7 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of diethylene glycol as starter and sodium stannate trihydrate as catalyst
- Example 8 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and K 2 CO 3 as catalyst
- Example 9 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and CS2CO3 as catalyst
- Example 10 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and NH4VO3 as catalyst
- the reaction was carried out analogously to Example 1, a total of 34.7 g of 1,6-hexanediol being used as the H-functional starter substance and 1.2 g of NH 4 VO 3 instead of NasVCE as a catalyst.
- Example 11 Preparation of polyether carbonate alcohols by ring-opening polymerization of cyclic propylene carbonate in the presence of 1,6-hexanediol as starter and Ca (V03) 2 as catalyst
- the catalysts used in Examples 1 to 8 lead to the addition of cyclic propylene carbonate to an H-functional starter substance, the use of NH 4 VO 3 and Ca (VC> 3 ) 2 as catalyst (Examples 9 and 10) does not result in polyether carbonate alcohol.
- the catalysts according to the invention lead to an increased incorporation of cyclic propylene carbonate into the polyether carbonate alcohols of Examples 1 to 5.
- the use of catalysts not according to the invention leads to the formation of olefin (allyl alcohol / ether) by-products in the production of polyether carbonate alcohols via the addition of cyclic alcohols Propylene carbonate on H-functional starter substance.
- catalysts not according to the invention to polyether carbonate alcohols with lower molecular weights (Examples 6, 7 and 8) results from the secondary reactions of the cyclic propylene carbonate which occur.
- K + or Cs + are used as alkali metal cation M for the catalysts according to the invention.
- the use of catalysts of this preferred embodiment results in a higher conversion of cPC in the process.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19192406.7A EP3783044A1 (de) | 2019-08-19 | 2019-08-19 | Verfahren zur herstellung von polyethercarbonatpolyolen |
| EP20158917 | 2020-02-24 | ||
| PCT/EP2020/072576 WO2021032553A1 (de) | 2019-08-19 | 2020-08-12 | Verfahren zur herstellung von polyethercarbonatalkoholen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4017899A1 true EP4017899A1 (de) | 2022-06-29 |
Family
ID=71950664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20751582.6A Withdrawn EP4017899A1 (de) | 2019-08-19 | 2020-08-12 | Verfahren zur herstellung von polyethercarbonatalkoholen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20220267515A1 (de) |
| EP (1) | EP4017899A1 (de) |
| CN (1) | CN114206981A (de) |
| WO (1) | WO2021032553A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4180474A1 (de) * | 2021-11-12 | 2023-05-17 | Covestro Deutschland AG | Verfahren zur herstellung von polyethercarbonatalkohole |
| DE102023000396A1 (de) | 2023-02-09 | 2024-08-14 | Covestro Deutschland Ag | Verfahren zur Herstellung von Polyethercarbonatalkoholen |
| CN116970158A (zh) * | 2023-09-25 | 2023-10-31 | 山东尚正新材料科技股份有限公司 | 聚碳酸丙烯酯二醇的制备方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1495299A1 (de) | 1963-05-09 | 1969-01-02 | Huels Chemische Werke Ag | Verfahren zur Herstellung linearer Polycarbonate |
| DE2523352A1 (de) | 1975-05-27 | 1976-12-09 | Bayer Ag | Verfahren zur herstellung aliphatischer polycarbonate |
| DE68927281T2 (de) | 1988-05-26 | 1997-03-06 | Daicel Chem | Polycarbonatdiolzusammensetzung und Polyurethankunststoff |
| DE10219028A1 (de) | 2002-04-29 | 2003-11-06 | Bayer Ag | Herstellung und Verwendung von hochmolekularen aliphatischen Polycarbonaten |
| EP2865700A1 (de) * | 2013-10-23 | 2015-04-29 | Bayer MaterialScience AG | Verfahren zur Herstellung von Polyethercarbonatpolyolen |
| US10040901B2 (en) * | 2014-07-03 | 2018-08-07 | Covestro Deutschland Ag | Method for producing polyether carbonate polyols |
| EP3219741A1 (de) * | 2016-03-18 | 2017-09-20 | Covestro Deutschland AG | Verfahren zur herstellung von polyethercarbonatpolyolen |
-
2020
- 2020-08-12 EP EP20751582.6A patent/EP4017899A1/de not_active Withdrawn
- 2020-08-12 CN CN202080058168.1A patent/CN114206981A/zh active Pending
- 2020-08-12 WO PCT/EP2020/072576 patent/WO2021032553A1/de not_active Ceased
- 2020-08-12 US US17/628,257 patent/US20220267515A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20220267515A1 (en) | 2022-08-25 |
| CN114206981A (zh) | 2022-03-18 |
| WO2021032553A1 (de) | 2021-02-25 |
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