Polyarylene polyether made using mixed base system
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United States of America Patent
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-
Dec 6, 1988
Issued Date -
N/A
app pub date -
Jul 29, 1987
filing date -
Jan 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Polyarylene polyethers, made by a process comprising reacting a dihydroxy compound and strong and weak bases in a liquid reaction medium at 100.degree.-200.degree. C. to form a double salt and then reacting the double salt with a slight molar excess of dihalobenzenoid compound bearing two replaceable halogens, are disclosed. The process reliably produces halogen-terminated polyarylene polyethers of select degrees of polymerization and desirable correspondence between weight and number average molecular weights. In subsequent steps amine-terminated polyarylene polyethers are made using the strong and weak bases. The resulting amine-terminated polyethers have a low, select degree of polymerization, desirable correspondence between weight and number average molecular weights and high level of amine termination.
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