Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1993-11-24
1994-12-06
Prescott, Arthur C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C07C 6724
Patent
active
053712765
ABSTRACT:
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.
REFERENCES:
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patent: 4847332 (1989-07-01), Yu
patent: 4959481 (1990-09-01), Axelrod et al.
patent: 4968746 (1990-11-01), DeRudder et al.
Chu Shiao-Jung
Lin Ching-Tang
Liu Fu-Chen
Yeh Huey-Jiuan
Yu Fu-Hsi
Industrial Technology Research Institute
Prescott Arthur C.
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