摘要:
The invention is directed to a double-metal cyanide catalyst for the preparation of a polyether polyol by the polyaddition of an alkylene oxide on to a starter compound containing active hydrogen atoms, wherein the DMC catalyst comprises a) at least one double-metal cyanide compound; b) at least one organic complexing ligand which is not a polyether, a bile acid, a bile acid salt, a bile acid ester or a bile acid amide; c) at least one polyether; and d) at least one bile acid, bile acid salt, bile acid ester or bile acid amide. The catalyst of the present invention has increased activity in the preparation of a polyether polyol.
摘要:
The invention relates to long-chain polyether polyols having a content of primary OH groups of 40 to 95 mol-% and a total content of oxyethylene units of >25 wt. % as well as a process for their production by DMC-catalysed polyaddition of an ethylene oxide (EO)/propylene oxide (PO) mixture in the weight ratio of 40:60 to 95:5 as an end block to starter compounds having active hydrogen atoms.
摘要:
This invention relates to novel double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c) and c) ionic surface- or interface-active compounds. The catalysts according to the invention have greatly increased activity in the production of polyether polyols.
摘要:
The invention relates to a process for the preparation of polyether polyols by means of double metal cyanide (DMC) catalysts, in which the induction phase is shortened markedly. By continuous dispensing of an alkylene oxide into the starter-catalyst mixture it is possible to achieve a substantial shortening of the induction phase by comparison with the batch-wise activation.
摘要:
The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerization of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of additives A) chosen from the group consisting of sterically non-hindered phenols, catechols, pyrocatechols, thiazines, phenothiazines, thiazoles, benzothiazoles, oxazines, phenoxazines, 2,2,6,6-tetramethylpiperidine 1-oxyl and nitrostyrenes and optionally in the presence of metal salts B).
摘要:
The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter substances, one or more alkylene oxides and carbon dioxide in the presence of at least one double metal cyanide catalyst, wherein the cyanide-free metal salt, the metal cyanide salt or both the mentioned salts used for the preparation of the double metal cyanide catalyst contain(s) from 0.3 to 1.8 mol base equivalents (based on 1 mol of the metal cyanide salt used for the synthesis of the catalyst) of alkaline metal hydroxide, metal carbonate and/or metal oxide.
摘要:
The present invention relates to a process for the activation of double metal cyanide (DMC) catalysts for the preparation of polyether carbonate polyols by catalytic copolymerisation of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances.
摘要:
The invention relates to a photopolymer formulation comprising matrix polymers, writing monomers, and photo initiators, comprising a combination of at least two different writing monomers. The invention further relates to the use of the photopolymer formulation for producing optical elements, in particular for producing holographic elements and images, to a method for producing the photopolymer formulation and to a method for illuminating holographic media made of the photopolymer formulation.
摘要:
The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter substances, one or more alkylene oxides and carbon dioxide in the presence of at least one double metal cyanide catalyst, wherein the cyanide-free metal salt, the metal cyanide salt or both the mentioned salts used for the preparation of the double metal cyanide catalyst contain(s) from 0.3 to 1.8 mol base equivalents (based on 1 mol of the metal cyanide salt used for the synthesis of the catalyst) of alkaline metal hydroxide, metal carbonate and/or metal oxide.
摘要:
The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerization of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of additives A) chosen from the group consisting of sterically non-hindered phenols, catechols, pyrocatechols, thiazines, phenothiazines, thiazoles, benzothiazoles, oxazines, phenoxazines, 2,2,6,6-tetramethylpiperidine 1-oxyl and nitrostyrenes and optionally in the presence of metal salts B).