Patent ID: 8445625
Filing Date: 2013-05-21
Classification: C08G

Abstract:
1. A process for producing a polyether having at least one hydroxy group by subjecting a first and second cyclic monomer capable of ring-opening addition polymerization and at least part of which is a cyclic ether, to ring-opening addition polymerization to an initiator having a hydroxy group in the presence of a double metal cyanide complex catalyst, comprising an initial step of supplying the first cyclic monomer in an amount of from 5 to 20 parts by mass per 100 parts by mass of the initiator to a reaction system containing the initiator and the double metal cyanide complex catalyst, to carry out reaction, and a polymerization step of supplying the second cyclic monomer to the reaction system after the initial step to carry out ring-opening addition polymerization, wherein in the initial step, the temperature of the reaction system when supply of the first cyclic monomer is started is from 120 to 165° C., and the maximum temperature of the reaction system after supply of the first cyclic monomer in the initial step is higher by from 15 to 50° C. than the temperature when supply of the second cyclic monomer is started, and wherein the first cyclic monomer and the second cyclic monomer may be the same or different.