Patent ID: 9708448
Date: 2017-07-18
CPC Classifications: C08G

Claim:
1. A semi-batch or continuous process for producing poly(1,2-butylene oxide) polymers, comprising polymerizing 1,2-butylene oxide or a mixture of at least 50% by weight 1,2-butylene oxide and up to 50% by weight of a copolymerizable alkylene oxide at a polymerization temperature of 110 to 140° C. in the presence of enough of a double metal cyanide catalyst to provide a cobalt concentration of 1 to 6 parts per million in the product and in the presence of a hydroxylic initiator compound having 2 to 6 hydroxyl groups, while maintaining a concentration of unreacted alkylene oxides at 2 to 6% by weight, to form a polymer or copolymer of 1,2-butylene oxide having at least one block of homopolymerized or randomly copolymerized 1,2-butylene oxide having a number average weight of at least 500 atomic mass units and which contains no more than 25 microequivalents per gram of monofunctional, unsaturated species.