PROCESS FOR INCREASING THE COALESCENCE RATE FOR AMINE-INITIATED POLYETHERS

Disclosed is an improvement to a polyether preparation process that includes a coalescing step. Amine-initiated polyethers prepared using a mixed alkylene oxide feed tend to coalesce significantly more slowly than glycerin-initiated polyethers, particularly in processes that include a holding step a...

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Main Authors FISCHER KATIE, CHAUVEL JEAN P, WESTON JOHN W, COSMAN JAMES P, LENGYEL ISTVAN, CHAUDHARY SUNIL K, MCCRERY DAVID A, CHRISTENSON CHRISTOPHER P
Format Patent
LanguageEnglish
Published 12.05.2011
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:Disclosed is an improvement to a polyether preparation process that includes a coalescing step. Amine-initiated polyethers prepared using a mixed alkylene oxide feed tend to coalesce significantly more slowly than glycerin-initiated polyethers, particularly in processes that include a holding step and/or elevated temperature following an initial alkoxylation to form a pre-polymer. This improvement is to perform a remedial end-capping of the pre-polymer, which may include amine degradation products, using an alkylene oxide which contains at least (3) carbons, prior to the molecular weight-building alkoxylation with the mixed alkylene oxide feed. The rate and performance of coalescing thereafter may be substantially enhanced.
Bibliography:Application Number: US200913001628