Tertiary amine-containing polyols prepared in a Mannich condensation reaction using a mixture of alkanolamines
AssigneeThe Dow Chemical Company
InventorsJohn E. Marugg, Michael A. P. Gansow, Johan A. Thoen
Life of this patent
Estimating the term…
Abstract
An improved process for preparing Mannich polyols is disclosed. The process involves capping a Mannich condensate of a phenolic compound or an amino-substituted s-triazine with a small quantity of an alkylene oxide in the absence of an alkylene oxide polymerization catalyst, prior to heating the condensate to elevated temperatures at which polycondensates are formed. The capped Mannich condensate is then alkoxylated to form the desired polyol.
Claims13
An improved process for preparing a Mannich polyol wherein a phenolic compound or amino-substituted s-triazine derivative is reacted with formaldehyde and an alkanolamine to form a Mannich condensate which is subsequently at least partially dewatered and then alkoxylated, the improvement comprising reacting the Mannich condensate, prior to heating said condensate to a temperature at which the condensate forms significant quantities of multiring compounds, with about 0.2 to about 2 moles of an alkylene oxide per hydroxyl group on the Mannich condensate in the substantial absence of a basic alkylene oxide polymerization catalyst to form a capped Mannich condensate, and then alkoxylating the capped Mannich condensate in the presence of an alkylene oxide polymerization catalyst.
Dependencies are inferred from the claim text.