Provided are a photocurable resin composition that can be suitably used for an optical three-dimensional shaping method, and a cured product obtained by photocuring the composition and a three-dimensional shaped object including the cured product. The photocurable resin composition contains a compound represented by the formula (1) and a compound containing two or more epoxy groups. ##STR00001##

Embodiments relate to a method of producing a modified double metal cyanide complex, a method of producing a monol or polyol that includes providing the modified double metal cyanide complex, an alkylene oxide polymerization process that includes providing the modified double metal cyanide complex, a batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex, and a polyether polyol prepared using the batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex.

Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a cyclic amidine. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of cyclic amidine greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.

Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a phosphorus-nitrogen base. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of phosphorus-nitrogen base greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.

Provided is a catalyst for synthesizing a polyethylene oxide polymer, comprising a crown ether as a first component, a quaternary phosphonium salt as a second component, and an alkali metal and/or an alkali metal compound as a third component. The catalyst can reduce the concentration of alkali metal ions in the product and is suitable for high-standard industrial fields. Also provided is a method for synthesizing a polyethylene oxide polymer, comprising carrying out a reaction of a compound containing active hydrogen and ethylene oxide in the presence of the catalyst. The method is simple to operate and environmentally friendly, improves the quality of the synthesized product, and is suitable for high-standard industrial production.

Processes and production plants for preparing a polyol. The process includes continuously producing an intermediate polyol in a first reactor, b) continuously discharging the intermediate polyol from the first reactor, continuously mixing the intermediate polyol with an aqueous solutions of alkali metal to provide a mixture comprising the intermediate polyol, alkali metal, and water, continuously dehydrating the mixture comprising intermediate polyol, alkali metal, and water, thereby continuously producing a dehydrated mixture comprising the intermediate polyol and the alkali metal, transferring the dehydrated mixture to a second reactor, and producing the polyether polyol in the second reactor by feeding an alkylene oxide to the second reactor to thereby react the intermediate polyol with the alkylene oxide in the presence of the alkali metal.

The present invention relates to a supported catalyst used for synthesizing polyether amine, a preparation method, and an application. The supported catalyst introduces Mo and CeO.sub.2 into Ni and Cu active components. By means of the cooperation of Ni, Cu and Mo, CeO.sub.2 and Ni form more active sites, such that the supported catalyst can have high reaction activity and selectivity. By using the supported catalyst to synthesize polyether amine, the amination efficiency and selectivity of polyether polyol can be greatly enhanced, thereby preparing the polyether amine with light color and narrow molecular weight distribution. In addition, the cost of the catalyst can be reduced, a process condition is relatively mild, and the disadvantage of low reaction activity of a nickel-based catalyst in synthesizing small molecule polyether amine can be overcome, such that the supported catalyst has a desirable industrial application prospect.

Polyethers are prepared by polymerizing an alkylene oxide in the presence of a double metal cyanide catalyst complex and certain M.sup.5 metal or semi-metal compounds. The double metal cyanide catalyst complex contains 0 5 to 2 weight percent potassium. The ability of this catalyst system to tolerate such high amounts of potassium permits the catalyst preparation procedure to be simplified and less expensive.

Provided is a method for producing poly(alkylene carbonate)polyol, and specifically, a method for producing poly(alkylene carbonate)polyol having carbonate, ester, and ether bonds by mixing a Salen-based catalyst and a double metal cyanide catalyst.

A method of producing a high primary hydroxyl group content and a high number average molecular weight polyol includes preparing a mixture that includes a double metal cyanide catalyst and a low molecular weight polyether polyol having a number average molecular weight of less than 1,000 g/mol, the polyether polyol is derived from propylene oxide, ethylene oxide, or butylene oxide, setting the mixture to having a first temperature, adding at least one selected from propylene oxide, ethylene oxide, and butylene oxide to the mixture at the first temperature, allowing the mixture to react to form a reacted mixture, adding a Lewis acid catalyst to the reacted mixture, setting the reaction mixture including the second catalyst to have a second temperature that is less than the first temperature, and adding additional at least one selected from propylene oxide, ethylene oxide, and butylene oxide to the reacted mixture at the second temperature such that a resultant polyol having a primary hydroxyl group content of at least 60% and a number average molecular weight greater than 2,500 g/mol is formed.