首页>
外国专利>
Primary polyether active hydrogen compounds which are prepared from linked, protectively initiated polyalkyleneoxides
Primary polyether active hydrogen compounds which are prepared from linked, protectively initiated polyalkyleneoxides
展开▼
机译:由连接的,保护性引发的聚环氧烷制备的伯聚醚活性氢化合物
展开▼
页面导航
摘要
著录项
相似文献
摘要
Polyether active hydrogen compounds having at least two terminal active hydrogen groups on primary carbon atoms are prepared by (a) forming polyoxyalkylene molecules each having at least one active hydrogen precursor, (b) linking at least two of the polyoxyalkylene molecules, and (c) converting the active hydrogen precursor groups to active hydrogen groups on primary carbon atoms. The polyoxyalkylene molecule is formed by exposing a reaction mixture comprising at least one alkylene oxide and at least one protective initiator to conditions effective for the polymerization of the alkylene oxides. Linking is accomplished at polyether chain ends distal to the protected active hydrogen precursor groups, such that the active hydrogen precursors remain on the linked polyether chains until they are converted to active hydrogen groups. The process is particularly useful to produce polyether compounds having at least about 80 mole percent primary active hydrogen groups, which compounds are useful, for instance, in forming polyurethanes.
展开▼