Synthesis of ABA triblock polymers and A.sub.n B s

专利名称：Synthesis of ABA triblock polymers and

A.sub.n B star polymers from cyclic ethers

发明人：Robert B. Wardle,Jerald C. Hinshaw,William

W. Edwards

申请号：US07/362633申请日：19890607公开号：US04952644A公开日：19900828

摘要：ABA triblock and A.sub.n B star polymers are produced by sequential cationicpolymerization of 4 and 5 member ring cyclic ethers to initially form a B block andsubsequent cationic polymerization of 4 and 5 member ring cyclic ethers to form Ablocks at the termini of the B block. The B block is grown from the hydroxyl groups of apolyol having two or more hydroxyl groups, resulting in a B block having terminalhydroxyl functionality of two or greater. In growing each of the B and A blocks, the acidcatalyst is used at a molar ratio relative to hydroxyl groups of the polyol initiator ofbetween about 0.05:1 and about 0.5:1.

申请人：THIOKOL CORPORATION

代理人：Wayne E. Nacker,Gerald K. White,Allen H. Erickson

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