Abstract: Process for producing flexible polyurethane foams in particular molded flexible polyurethane foams, by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein the component b) comprises b1a) at least one polyether alcohol having an end block of ethylene oxide units which has been added on by means of DMC catalysis and makes up not more than 10% by weight of the weight of the alkylene oxide added on by means of DMC catalysis, and/or b1b) at least one polyether alcohol comprising a terminal mixture of ethylene oxide and propylene oxide which has been added on by means of DMC catalysis and has an ethylene oxide content in the mixture of at least 25% by weight, and also b2a) at least one polyether alcohol or comprising exclusively propylene oxide units, and/or b2b) at least one graft polyether alcohol.

Abstract: Process for preparing multimetal cyanide compounds, which comprises the steps a) reaction of the aqueous solution of a metal salt of the general formula (I) M1gXn ??(I) With the aqueous solution of a cyanometalate compound of the general formula (II) M3r[M2(CN)b]d, ??(II), If appropriate in the presence of organic ligands, organic additives and/or surface-active agents, to form a multimetal cyanide compound of the general formula (III) M1a[M2(CN)b]d.fM1jXk.h(H2O).eL.zP ??(III) b) reaction of the multimetal cyanide compound of the general formula (III) with a salt of the general formula (IV) M4sYt ??(IV) which is different from general formula (II) where M1, M2, M3, M4, X, L, P, Y, g, n, r, b, d, a, f, j, k, h, e, z, s, and t are defined in the specification.

Abstract: The invention relates to a process for the continuous preparation of polyether alcohols by reaction of alkylene oxides with H-functional starter substances in the presence of DMC catalysts, which comprises, at the beginning of the process a) firstly placing initial charge material and DMC catalyst in a reactor, b) metering in alkylene oxide so that the metering rate which is maintained for continuous operation of the reactor is reached in a time of from 100 to 3000 seconds, c) metering in starter substance during or after step b) so that the metering rate which is maintained for continuous operation of the reactor is reached in a time of from 5 to 500 seconds, d) after the fill level in the reactor which is desired for continuous operation of the reactor has been reached, taking product off continuously from the reactor while at the same time metering in starter substance and alkylene oxides in such an amount that the fill level in the reactor remains constant and metering in DMC catalyst so that the catalys

Abstract: The invention relates to a process for preparing DMC catalysts by reacting cyanometalate compounds, preferably cyanometalate salts, in particular alkali metal or alkaline earth metal salts, with metal salts, wherein the reaction is carried out in the presence of a Brönsted acid.

Abstract: The invention relates to a process for producing flexible polyurethane foams, in particular molded flexible polyurethane foams, by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein at least one polyether alcohol bi) which has been prepared by means of a DMC catalyst and has a hydroxyl number in the range from 15 to 35 mg KOH/g, and ethylene oxide content in the range from 5 to 18% by weight, based on the total weight of the polyether alcohol and an end block of ethylene oxide and propylene oxide having an ethylene oxide content of from 25 to 75% by weight, based on the amount of alkylene oxide in the end block, is used as compound b) having at least two hydrogen atoms which are reactive toward isocyanate groups.

Abstract: The invention provides a process for preparing polyether alcohols by adding alkylene oxides onto H-functional starter substances using DMC catalysts, which comprises, in a first step, adding propylene oxide or a mixture of propylene oxide and ethylene oxide onto H-functional starter substances and, in a second step, transferring the product thus formed into a tubular reactor in which mixtures of ethylene oxide and propylene oxide are metered in at least two metering points, the proportions of ethylene oxide and propylene oxide in the mixtures metered in in the first and in the second step being different, the proportions of ethylene oxide and propylene oxide in the mixtures metered in at least two metering points in the second step being different, and the mixture metered in in the second step, at least at the last metering point, comprising at least 40% by weight of ethylene oxide.

Abstract: The invention relates to polyether alcohols, to a process for preparing polyether alcohols by reacting alkylene oxides in the presence of a double metal cyanide (DMC) catalyst with at least one saturated OH component which may, if appropriate, have previously been reacted with an alkylene oxide, wherein an antioxidant is added before or during the reaction, and also to the further processing of the polyether alcohols to form polyurethanes.

Abstract: Process for preparing multimetal cyanide compounds, which comprises the steps a) reaction of the aqueous solution of a metal salt of the general formula (I) M1gXn ??(I) with the aqueous solution of a cyanometalate compound of the general formula (II) M3r[M2(CN)b]d, , ??(II) if appropriate in the presence of organic ligands, organic additives and/or surface-active agents, to form a multimetal cyanide compound of the general formula (III) M1a[M2(CN)b]d.fM1jXk.h(H2O).eL.

Abstract: Process for preparing double metal cyanide catalysts of the general formula (I) M2a[M1(CN)rXt]b ??(I) where M2 is preferably Co(III) or Fe(III), and M1 is preferably Zn(II), X is a group other than cyanide which forms a coordinate bond to M1 and is selected from the group consisting of carbonyl, cyanate, isocyanate, nitrile, thiocyanate and nitrosyl, a, b, r, t are integers which are selected so that the compound is electrically neutral, by reacting a) a cyanometallic acid of the general formula (II) Hw[M1(CN)r(X)t] where M1 and X are as defined above, r and t are as defined above and w is selected so that the compound is electrically neutral, with b) a readily protolyzable metal compound (IIIa) M2Rw and/or (IIIb) M2RuYv, where M2 is as defined above, the groups R are identical or different and are each the anion of a very weak protic acid having a pKa of ?20, and Y is the anion of an inorganic mineral acid or a moderately strong to strong organic acid having a pKa of from ?10 to +10, w correspon

Abstract: The invention relates to a process for preparing DMC catalysts by reacting cyano-metalate compounds, preferably cyanometalate salts, in particular alkali metal or alkaline earth metal salts, with metal salts, wherein the reaction is carried out in the presence of a Brönsted acid.

Abstract: The invention provides a process for preparing polyether alcohols by adding alkylene oxides onto H-functional starter substances using DMC catalysts, which comprises, in a first step, adding propylene oxide or a mixture of propylene oxide and ethylene oxide onto H-functional starter substances and, in a second step, transferring the product thus formed into a tubular reactor in which mixtures of ethylene oxide and propylene oxide are metered in at least two metering points, the proportions of ethylene oxide and propylene oxide in the mixtures metered in in the first and in the second step being different, the proportions of ethylene oxide and propylene oxide in the mixtures metered in at least two metering points in the second step being different, and the mixture metered in in the second step, at least at the last metering point, comprising at least 40% by weight of ethylene oxide.

Abstract: The invention provides a continuous process for preparing DMC catalysts, which comprises continuously feeding the solutions of a metal salt and of a hexacyanometallate compound and, if appropriate, organic ligands and/or organic additives into a continuous reactor, and continuously withdrawing the resulting suspension of the DMC compound from the reactor.

Abstract: The present invention relates to a process for preparing a polyetherol which comprises reacting at least one alkylene oxide with at least one starter compound in the presence of a catalyst of the formula I: M1p[M2qOn(OH)2(3-n)]x,??(I) and to the polyetherols prepared by such a process and to their use for the synthesis of polyurethanes, as fuel additive or as surfactant.

Abstract: The invention relates to a process for producing flexible polyurethane foams, in particular molded flexible polyurethane foams, by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein at least one polyether alcohol bi) which has been prepared by means of a DMC catalyst and has a hydroxyl number in the range from 15 to 35 mg KOH/g, and ethylene oxide content in the range from 5 to 18% by weight, based on the total weight of the polyether alcohol and an end block of ethylene oxide and propylene oxide having an ethylene oxide content of from 25 to 75% by weight, based on the amount of alkylene oxide in the end block, is used as compound b) having at least two hydrogen atoms which are reactive toward isocyanate groups.

Abstract: The present invention relates to a process for the alkoxylation of organic compounds comprising the reaction of at least one organic compound with at least one alkoxylating agent in the presence of a catalyst system, wherein a polyether alcohol is obtained. The catalyst system comprises a metallo organic framework mate-rial comprising pores and at least one metal ion and at least one at least bidentate organic compound, which is coordinately bounded to said metal ion. Furthermore it relates to polyurethanes or polyurethane foams, which are obtainable by using a prepared polyether alcohol as a starting material.

Abstract: Process for producing flexible polyurethane foams in particular molded flexible polyurethane foams, by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein the component b) or comprises b1a) at least one polyether alcohol having an end block of ethylene oxide units which has been added on by means of DMC catalysis and makes up not more than 10% by weight of the weight of the alkylene oxide added on by means of DMC catalysis, and/or b1b) at least one polyether alcohol comprising a terminal mixture of ethylene oxide and propylene oxide which has been added on by means of DMC catalysis and has a n ethylene oxide content in the mixture of at least 25% by weight, and also b2a) at least one polyether alcohol or comprising exclusively propylene oxide units. and/or b2b) at least one graft polyether alcohol.

Abstract: The invention relates to polyether alcohols, to a process for preparing polyether alcohols by reacting alkylene oxides in the presence of a double metal cyanide (DMC) catalyst with at least one saturated OH component which may, if appropriate, have previously been reacted with an alkylene oxide, wherein an antioxidant is added before or during the reaction, and also to the further processing of the polyether alcohols to form polyurethanes.

Abstract: A process for preparing polyether alcohols by addition of alkylene oxides onto H-functional starter substances in the presence of multimetal cyanide catalysts, wherein the multimetal cyanide catalysts are microporous and have a specific surface area of more than 100 m2/g, determined by nitrogen adsorption at 77 K.

Abstract: The invention relates to a process for the continuous preparation of polyether alcohols by reaction of alkylene oxides with H-functional starter substances in the presence of DMC catalysts, which comprises, at the beginning of the process a) firstly placing initial charge material and DMC catalyst in a reactor, b) metering in alkylene oxide so that the metering rate which is maintained for continuous operation of the reactor is reached in a time of from 100 to 3000 seconds, c) metering in starter substance during or after step b) so that the metering rate which is maintained for continuous operation of the reactor is reached in a time of from 5 to 500 seconds, d) after the fill level in the reactor which is desired for continuous operation of the reactor has been reached, taking product off continuously from the reactor while at the same time metering in starter substance and alkylene oxides in such an amount that the fill level in the reactor remains constant and metering in DMC catalyst so that the catalyst

Abstract: Process for preparing polyether polyols having an end block of ethylene oxide by addition of alkylene oxides onto H-functional starter substances, in which A) a polyether polyol precursor is prepared by means of double metal cyanide (DMC) catalysis in a semicontinuous mode of operation in which previously prepared polyether polyol together with the DMC catalyst are placed in a reactor and H-functional starter substance and propylene oxide are added continuously, B) the polyether polyol precursor from stage A) is reacted with propylene oxide or an ethylene oxide/propylene oxide mixture in the presence of the DMC catalyst in a continuously operating reactor to give a polyether polyol intermediate, C) the intermediate from stage B) is mixed with an alkali metal hydroxide as catalyst and D) reacted with ethylene oxide in a continuously operating reactor to give the final product, E) the catalyst is separated off from the final product obtained in stage D).