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  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
  • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
  • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
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  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
  • B01J21/08—Silica
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  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
  • B01J27/24—Nitrogen compounds
  • B01J27/26—Cyanides
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  • B01J29/00—Catalysts comprising molecular sieves
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  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
  • B01J31/22—Organic complexes
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  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
  • B01J31/22—Organic complexes
  • B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
  • B01J31/2208—Oxygen, e.g. acetylacetonates
  • B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
  • B01J31/223—At least two oxygen atoms present in one at least bidentate or bridging ligand
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  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
  • B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
• • 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
  • B01J35/00—Catalysts, in general, characterised by their form or physical properties
  • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
  • B01J35/61—Surface area
  • B01J35/615—100-500 m2/g
• • 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
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
  • C08G65/2642—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
  • C08G65/2645—Metals or compounds thereof, e.g. salts
  • C08G65/2663—Metal cyanide catalysts, i.e. DMC's
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
  • B01J2231/10—Polymerisation reactions involving at least dual use catalysts, e.g. for both oligomerisation and polymerisation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
  • B01J2531/0238—Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/20—Complexes comprising metals of Group II (IIA or IIB) as the central metal
  • B01J2531/26—Zinc
• • 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
  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/60—Complexes comprising metals of Group VI (VIA or VIB) as the central metal
  • B01J2531/62—Chromium
• • 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
  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
  • B01J2531/82—Metals of the platinum group
  • B01J2531/827—Iridium
• • 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
  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
  • B01J2531/84—Metals of the iron group
• • 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
  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
  • B01J2531/84—Metals of the iron group
  • B01J2531/845—Cobalt

Definitions

• Double metal cyanide catalysts for the production of polyether polyols Double metal cyanide catalysts for the production of polyether polyols
• the invention relates to new double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides to active ones
• Double metal cyanide (DMC) catalysts for the polyaddition of alkylene oxides to starter compounds having active hydrogen atoms are known (see e.g. US-A 3 404 109, US-A 3 829 505, US-A 3 941 849 and US-A 5 158 922).
• DMC Double metal cyanide
• DMC catalysts for the production of polyether polyols results in particular in a reduction in the proportion of monofunctional polyethers with terminal double bonds, so-called monools, in comparison to the conventional production of polyether polyols using alkali catalysts, such as alkali metal hydroxides.
• the polyether polyols thus obtained can be processed into high-quality polyurethanes (e.g. elastomers, foams, coatings).
• DMC catalysts are usually obtained by combining an aqueous solution of a metal salt with the aqueous solution of a metal cyanide salt in the presence of an organic complex ligand, e.g. of an ether.
• aqueous solutions of zinc chloride in a typical catalyst preparation, for example, aqueous solutions of zinc chloride (in
• DMC catalysts are known from JP-A 4 145 123, US-A 5 470 813, EP-A 700 949, EP-A 743 093, EP-A 761 708 and WO 97/40086.
• Butanol as an organic complex ligand (alone or in combination with a polyether (EP-A 700 949, EP-A 761 708, WO 97/40086)) further reduce the proportion of monofunctional polyethers with terminal double bonds in the production of polyether polyols.
• the use of these DMC catalysts reduces the induction time in the polyaddition reaction of the alkylene oxides with appropriate starter compounds and increases the catalyst activity.
• the present invention therefore relates to a double metal cyanide (DMC) catalyst comprising
• water preferably 1 to 10% by weight and / or e) one or more water-soluble metal salts, preferably 5 to 25% by weight, of the formula (I) M (X) n from the Preparation of the double metal cyanide compounds a) may be included.
• M is selected from the metals Zn (11), Fe (II), ⁇ i (II), Mn (II), Co (II), Sn (II), Pb (11), Fe (III) , Mo (IV), Mo (VT), AI (III), N (N), N (IN), Sr (II), W (IN), W (NI), Cu (II) and Cr (HI) , Zn (LT), Fe (II), Co (II) and ⁇ i (IT) are particularly preferred.
• the anions X are the same or different, preferably the same, and preferably selected from the
• n 1, 2, or 3.
• the double metal cyanide compounds a) contained in the catalysts according to the invention are the reaction products of water-soluble metal salts and water-soluble metal cyanide salts.
• Water-soluble metal salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (I) M (X) n , where M is selected from the metals Zn (II), Fe (II), ⁇ i (LT), Mn (II), Co (II), Sn (II), Pb (LT),
• the anions X are the same or different, preferably the same and are preferably selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates.
• n 1, 2 or 3.
• water-soluble metal salts examples include zinc chloride, zinc bromide, zinc acetate, zinc acetylacetonate, zinc benzoate, zinc nitrate, iron (II) sulfate, iron (II) bromide, iron (II) chloride, cobalt (II) chloride, cobalt ( ⁇ ) thiocyanate, nickel ( II) chloride and nickel (II) nitrate. Mixtures of various water-soluble metal salts can also be used.
• Water-soluble metal cyanide salts suitable for the preparation of double metal cyanide compounds a) preferably have the general formula (II) (Y) a M '(CN) b (A) c , where M' is selected from the metals Fe (II), Fe (III ), Co (II), Co (III), Cr (II), Cr (III), Mn ( ⁇ ), Mnttli), Ir (III), Ni (II), Rh (III), Ru (LI), V (IN) and N (V). M 'is particularly preferably selected from the metals Co (II), Co (III), Fe (II), Fe (IÜ), Cr (ILT), Ir (III) and ⁇ i (II).
• the water-soluble metal cyanide salt can contain one or more of these metals.
• the cations Y are the same or different, preferably the same, and are selected from the alkali metal ions and earth group comprising alkali metal ions.
• the anions A are the same or different, preferably the same, and are selected from the group of halides, hydroxides, sulfates, carbonates, cyanates, thiocyanates, isocyanates, isothiocyanates, carboxylates, oxalates or nitrates.
• Both a and b and c are integers, the values for a, b and c being chosen so that the electroneutrality of the metal cyanide salt is given; a is preferably 1, 2, 3 or 4; b is preferably 4, 5 or 6; c preferably has the value 0.
• suitable water-soluble metal cyanide salts are potassium hexacyanocobaltate (III), potassium hexacyanoferrate (II) 5 potassium hexacyanoferrate (III), calcium hexacyanocobaltate (III) and lithium hexacyanocobalate (III).
• Preferred double metal cyanide compounds a) which are contained in the catalysts according to the invention are compounds of the general formula (III)
• M is as defined in formula (I) and M 'as defined in formula (LT), and x, x', y and z are integers and are chosen such that the electron neutrality of the double metal cyanide compound is given.
• M ' Co (III), Fe ( ⁇ i) 5 Cr (III) or IxQlT).
• Suitable double metal cyanide compounds a) are zinc hexacyanocobalate (III), zinc hexacyanoiridate (III), zinc hexacyanoferrate (III) and cobalt (II) hexacyano cobaltate (III). Further examples of suitable double metal cyanide compounds are see for example US-A 5 158 922. Ziric hexacyanocobaltate (III) is particularly preferably used.
• organic complex ligands b) contained in the DMC catalysts according to the invention are known in principle and are described in detail in the prior art (for example in US Pat. No. 5,158,922, US Pat. No. 3,404,109, US Pat. No. 3,829,505, US) -A 3 941 849, EP-A 700 949, EP-A 761. 708, JP-A 4 145 123, US-A 5 470 813, EP-A 743 093 and WO 97/40086).
• Preferred organic complex ligands are water-soluble, organic compounds with heteroatoms, such as oxygen, nitrogen, phosphorus or sulfur, which with the double metal cyanide compound a)
• Suitable organic complex ligands are e.g. Alcohols, aldehydes, ketones, ethers, esters, amides, ureas, nitriles, sulfides and their mixtures.
• Preferred organic complex ligands are water-soluble aliphatic alcohols, such as ethanol, isopropanol, n-butanol, iso-butanol, sec. -Butanol and tert-butanol. Tert-butanol is particularly preferred.
• Suitable cyclic polyols c) have at least two hydroxyl groups per molecule. They preferably have 2 to 4 OH groups per molecule, the number ratio of carbon atoms and OH groups in the molecule preferably not being greater than 4.
• the polyols can have aromatic or aliphatic ring structures; cycloaliphatic polyols are preferably used.
• the polyols preferably have 6 to 20 carbon atoms, the number of carbon atoms in the ring is preferably at least 8. Examples of cyclic polyol compounds preferably used are 1,2-cyclooctanediol and 1,5-cyclooctanediol.
• the DMC catalysts according to the invention contain the double metal cyanide compounds a) in amounts of 20 to 90% by weight, preferably 25 to 80% by weight, based on the amount of the finished catalyst, and the organic complex ligands b) in amounts from 0.5 to 30, preferably 1 to 25 wt .-%, based on the amount of the finished catalyst.
• the DMC catalysts according to the invention usually contain Usually 1 to 80% by weight, preferably 1 to 40% by weight, based on the amount of the finished catalyst, of at least one cyclic polyol c).
• the analysis of the catalyst composition is usually carried out by means of elemental analysis, thermogravimetry or extractive removal of the proportion of the ionic
• the catalysts according to the invention can be crystalline, partially crystalline or amorphous.
• the crystallinity is usually analyzed by powder X-ray diffractometry.
• the DMC catalysts according to the invention are usually prepared in aqueous solution by reacting ⁇ ) metal salts, in particular of the formula
• aqueous solutions of the metal salt e.g.
• Zinc chloride used in a stoichiometric excess (at least 50 mol% based on the metal cyanide salt)) and the metal cyanide salt (for example potassium hexacyanocobaltate) are reacted in the presence of the organic complex ligand b) (for example tert-butanol), a suspension being formed which contains the double metal cyanide compound a) (eg zinc hexacyanocobaltate), water d), excess metal salt e), and the organic complex ligand b).
• the metal cyanide salt for example potassium hexacyanocobaltate
• the organic complex ligand b) can be present in the aqueous solution of the metal salt and / or the metal cyanide salt, or it is added directly to the suspension obtained after precipitation of the double metal cyanide compound a).
• the organic complex ligand is usually used in excess. It has proven advantageous to mix the aqueous solutions and the organic complex ligand b) with vigorous stirring.
• the suspension formed is then usually treated with component c).
• Component c) is preferably used in a mixture with water and organic complex ligand b).
• the catalyst is then isolated from the suspension by known techniques, such as centrifugation or filtration.
• the isolated catalyst is then washed with an aqueous solution of the organic complex ligand b) (e.g. by resuspending and then isolating again by filtration or centrifugation).
• an aqueous solution of the organic complex ligand b) e.g. by resuspending and then isolating again by filtration or centrifugation.
• water-soluble by-products such as potassium chloride can be removed from the catalyst according to the invention.
• the proportion of the organic complex ligand b) is preferably in the aqueous
• the first washing process can be repeated, for example.
• non-aqueous solutions for example a mixture of organic complex ligands and the cyclic polyols c) used as component ⁇ ).
• the washed catalyst is then dried, if appropriate after pulverization, at temperatures of generally 20-100 ° C. and at pressures generally from 0.1 mbar to normal pressure (1013 mbar).
• the present invention furthermore relates to the use of the DMC catalysts according to the invention in a process for the preparation of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms.
• Preferred alkylene oxides are ethylene oxide, propylene oxide, butylene oxide and mixtures thereof.
• the structure of the polyether chains by alkoxylation can e.g. be carried out only with a monomeric epoxide or also statistically or in blocks with 2 or 3 different monomeric epoxides. More details can be found in "Ullmann's Encyclopedia of Industrial Chemistry", Volume A21, 1992, p. 670f.
• starter compounds having active hydrogen atoms compounds with (number average) molecular weights of 18 to 2,000 and 1 to 8 hydroxyl groups are preferably used.
• Examples include: ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,4-butanediol, hexamethylene glycol, bisphenol A, trimethylolpropane, glycerol, pentaerythritol, sorbitol, cane sugar, degraded starch or water.
• starter compounds containing active hydrogen atoms are used, which e.g. were prepared by conventional alkali catalysis from the abovementioned low molecular weight starters and are oligomeric alkoxylation products with (number average) molecular weights of 200 to 2,000.
• Alkylene oxides are carried out on starter compounds having active hydrogen atoms generally at temperatures from 20 to 200 ° C, preferably in the range from 40 to 180 ° C, particularly preferably at temperatures from 50 to 150 ° C.
• the reaction can be carried out at total pressures of 0.0001 to 20 bar.
• the polyaddition can be carried out in bulk or in an inert, organic solvent, such as toluene and / or THF.
• the amount of solvent is usually 10 to 30% by weight, based on the amount of the polyether polyol to be produced.
• the catalyst concentration is chosen so that the polyaddition reaction can be well mastered under the given reaction conditions.
• Catalyst concentration is generally in the range from 0.0005% by weight to 1% by weight, preferably in the range from 0.001% by weight to 0.1% by weight, particularly preferably in the range from 0.001 to 0.0025% by weight .-%, based on the amount of polyether polyol to be produced.
• the (number average) molecular weights of the polyether polyols produced by the process according to the invention are in the range from 500 to 100,000 g / mol, preferably in the range from 1,000 to 50,000 g / mol, particularly preferably in the range from 2,000 to 20,000 g / mol.
• the polyaddition can be continuous or discontinuous, e.g. be carried out in a batch or semi-batch process.
• the catalysts according to the invention can be used in very low concentrations (25 ppm and less, based on the amount of the polyether polyol to be produced). If the polyether polyols prepared in the presence of the catalysts according to the invention are used for the production of polyurethanes (Kunststoff Handbuch, Vol. 7, Polyurethane, 3rd edition 1993, pp. 25-32 and 57-67), the catalyst can be removed from the polyether polyol are without adversely affecting the product qualities of the polyurethane obtained. Examples
• a maximum of 50 g of propylene oxide were metered in at a pressure of 2.5 bar within 30 minutes. After 30 min the reaction mixture was cooled to RT and freed from propylene oxide by flushing with argon.
• the product was characterized by a molecular weight distribution determined by GPC (weight average).

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