Industrial Technology Research Institute

Fu-Chen Liu

Ching-Tang Lin

Shiao-Jung Chu

Wen-Fa Lin

Sheng-Te Yang

Huey-Jiuan Yeh

Fu-Hsi Yu

Kuei-Chih Wang

A method for preparing ester end-capped polyalkylene ether is disclosed. Cyclic ether monomers are subjected to ring-opening polymerzation at a temperature of 20.degree.-80.degree. C. and a pressure of 0-10 atm in the presence of a solid acid serving as catalyst and a mixture of acid and acid anhydride serving as a promoter. The solid acid is an oxide of group III and group IV elements and has been modified by sulfuric acid, ammonium sulfate or ammonium sulfite.

Ring-opening polymerization of cyclic ethers

A method for preparing ester end-capped polyalkylene ether is disclosed. Cyclic ether monomers are subjected to ring-opening polymerization at a temperature of 10.degree.-80.degree. C. and a pressure of 0-10 atm in the presence of a solid acid of a mixed oxide of group III and group IV elements serving as catalyst and a mixture of acid and acid anhydride serving as molecular weight moidifier. The group III and group IV elements used should have a Ho index of +3.0 to -10.0.

Method for preparing ester end-capped polyalkylene ether

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Nan-Tou Shiann, Taiwan

Fu-Chen Liu