This invention relates to an in-situ formed polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 50 to 150. A process for preparing these polyol blends is also disclosed. These in-situ formed polyol blends are suitable for preparing viscoelastic flexible polyurethane foams. A process for preparing these foams is also disclosed.

A (poly)ol block copolymer of general structure B-A-(B)n, wherein block A is a polycarbonate block or polyester block, n=t−1 and t=the number of reactive end residues on block A, wherein block B is a polyethercarbonate block and wherein >70% of the copolymer chain ends are terminated by primary hydroxyl groups, and a process of producing such copolymers and products incorporating such copolymers.

The invention relates to a compound of following formula (I): ##STR00001##
a preparation process, uses thereof and compositions containing the same, wherein R.sub.1 and R.sub.2, represent, independently of one another, a linear, branched or cyclic, saturated or unsaturated hydrocarbon-based group comprising from 1 to 6 carbon atoms, where the sum of the carbon atoms of the groups R.sub.1 and R.sub.2 ranges from 2 to 7, and where R.sub.1 and R.sub.2 may also form, together and with the carbon atom bearing them, a 6-, 7-, or 8-membered ring; n is an integer of between 1 and 100, limits included; A represents a sequence of one or more units chosen from ethylene oxide, propylene oxide, butylene oxide units and mixtures thereof; the group formed by R.sub.1, R.sub.2 and the carbon atom to which R.sub.1 and R.sub.2 are attached has a degree of branching equal to 0, 1 or 2.

The present invention relates to a method for preparing polyether carbonate polyols by adding alkylene oxide and carbon dioxide to a H-functional starter substance in the presence of a DMC catalyst or a metal complex catalyst based on the metals cobalt and/or zinc, wherein (γ) alkylene oxide and carbon dioxide are added to a H-functional starter substance in a reactor in the presence of a DMC catalyst or a metal complex catalyst based on the metals cobalt and/or zinc, characterized in that the alkylene oxide contains a proportion of 5 to 50 wt. % ethylene oxide, based on the overall weight of the alkylene oxide used, and the addition of the ethylene oxide is carried out in an atmosphere containing carbon dioxide.

The present disclosure discloses a synthesis method of polyether for a low-modulus sealant, belonging to the technical field of organic compound synthesis. In the synthesis method of the present disclosure, a reaction is performed by using a mixture of monohydric alcohol polyoxypropylene ether and polyhydric alcohol polyoxypropylene ether as a starter, using epoxypropane as a chain extender and adding a metal complex catalyst, so as to obtain the polyether for the low-modulus sealant after the reaction is ended. The polyether prepared in the present disclosure can not only well enhance the rigid strength of the sealant but also reduce the elasticity modulus of the sealant, overcoming the problem that the existing polyether silane modified sealant is high in modulus. The synthesis method of the present disclosure is simple in synthesis process, easy to produce and control, short in production period and low in energy consumption.

A method for the synthesis of a substituted poly(alkylene oxide) comprises reacting a substituted alcohol of formula (1) with an alkylene oxide of formula (2) in the presence of a catalyst and under conditions effective to provide the substituted poly(alkylene oxide) of formula (3) wherein in the foregoing formulas, each R is independently hydrogen, C.sub.1-60 alkyl, or C.sub.3-12 cycloalkyl, ring A is cyclohexane or phenyl, each R.sup.1 is independently hydrogen, methyl, ethyl, propyl, butyl, hexyl, decyl, dodecyl, tetradecyl, or hexadecyl, preferably hydrogen or methyl, and n is 2 to 60.

##STR00001##

The invention relates to a process for starting up a reactor for the continuous production process of polyether carbonate polyols by the addition of alkylene oxide and carbon dioxide in the presence of a DMC catalyst and/or a metal complex catalyst based on the metals cobalt and/or zinc to an H-functional starter substance, in which process: (α) a portion of the H-functional starter substance and/or a suspension medium which has no H-functional groups is mixed in a reactor with a DMC catalyst and/or a metal complex catalyst, the DMC catalyst and/or the metal complex catalyst having a concentration s in the mixture; and (γ), after step (α), the H-functional starter substance, alkylene oxide and DMC catalyst and/or a metal complex catalyst are continuously fed into the reactor during the addition process and the resulting reaction mixture is removed from the reactor, and a steady state is achieved.

A method for producing an ether esterol, preferably a polyether esterol, is provided. The method comprises reacting an H-functional starter substance (1) with a cyclic anhydride (2) in the presence of a catalyst (4), wherein the cyclic anhydride (2) contains a specific alkylsuccinic acid anhydride (2-1) and the catalyst (4) is an amine, a double metal cyanide (DMC) catalyst and/or a Bronsted acid. Ether esterols, preferably polyether esterols obtainable using the claimed method are also provided..

Processes for preparing a polymer polyol (PMPO) in which a base polyol is continuously produced in a continuous base polyol reactor, the base polyol is continuously discharged from the continuous base polyol reactor; the base polyol is continuously introduced to a continuous PMPO reactor, which is different from the continuous base polyol reactor, and PMPO is continuously removed from the PMPO reactor. Production plant configured to carry out such processes are also described.

A high-activity double-metal-cyanide catalyst, a method for fabricating the same, and applications of the same are disclosed. An organic complexing ligand, which is formed via mixing fatty alcohols and alicyclic carbonates, is used to generate a high-activity double-metal-cyanide catalyst. The high-activity double-metal-cyanide catalyst includes at least one double-metal-cyanide compound, at least one organic complexing ligand, and an optional functionalized compound. The double-metal-cyanide catalyst of the present invention has a higher activity than the conventional double-metal-cyanide catalysts. The polyols generated by the present invention has an insignificant amount of high-molecular-weight compounds.