Process for producing polyester ether poly- or mono-ol
To provide a process for producing a polyester ether poly- or mono-ol having a narrow molecular weight distribution, which is obtained by copolymerizing an initiator having hydroxyl groups with a cyclic ester compound and an alkylene oxide. It is possible to produce a polyester ether poly- or mono-ol having a molecular distribution (Mw/Mn) of from 1.02 to 1.4 by copolymerizing a cyclic ester compound which carbon number is from 3 to 9 and an alkylene oxide which carbon number is from 2 to 20 with an initiator having from 1 to 12 hydroxyl groups and having a number average molecular weight (Mn) of from 18 to 20,000 in the presence of a double-metal cyanide complex catalyst is having tert-butyl alcohol as at least a part of an organic ligand.
1. A process for producing a polyester ether polyol and/or a polyester ether monool having a molecular weight distribution (Mw/Mn) of from 1.02 to 1.4, comprising copolymerizing at least one cyclic ester compound which carbon number is from 3 to 9, and at least one alkylene oxide which carbon number is from 2 to 20 with at least one initiator having from 1 to 12 hydroxyl groups and having a number average molecular weight (Mn) of from 18 to 20,000 at a reaction temperature of from 115 to 180° C. in the presence of a double-metal cyanide complex catalyst having tert-butyl alcohol as at least a part of an organic ligand.
2. The process according to claim 1 , wherein the mass of the cyclic ester compound is in a range of from 5 to 90% based on the total mass of the cyclic ester compound and the alkylene oxide used for the copolymerization.
3. The process according claim 1 , wherein the copolymerization of the cyclic ester compound and the alkylene oxide is random copolymerization or random/block copolymerization.
4. The process according to claim 1 , wherein the copolymerization is carried out in the absence of a solvent.
5. The process according to claim 1 , wherein the double-metal cyanide complex catalyst is used in such an amount that the total amount of metals derived from the double-metal cyanide complex catalyst in the polyester ether polyol and/or the polyester ether monool obtained by the copolymerization, is from 1 to 30 ppm.
6. The process according to claim 1 , wherein the double-metal cyanide complex catalyst contains as the organic ligand, tert-butyl alcohol alone or a combination of tert-butyl alcohol and at least one member selected from the group consisting of n-butyl alcohol, sec-butyl alcohol, iso-butyl alcohol, tert-pentyl alcohol, iso-pentyl alcohol, N,N-dimethylacetamide and ethylene glycol mono-tert-butyl ether.
7. The process according to claim 1 , wherein the initiator contains a polyether polyol and/or a polyester monool having a molecular weight distribution (Mw/Mn) of at most 3.0.