Initiators for isocyanate reactions
AssigneeThe Dow Chemical Company
InventorsJiri Kresta, Chen S. Shen
Life of this patent
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Abstract
The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.
Claims7
A process for preparing a polyurethane foam from (A) an organic isocyanate containing an average of at least two isocyanate groups per molecule or mixture of such isocyanates with (B) a mixture of water and a polyol having at least two alkanol groups per molecule or a mixture of such polyols which comprises reacting (A) and (B) in the presence of (C) a volatile, low boiling solvent as an auxiliary blowing agent and (D) an ar-sulfonium areneoxide as a catalyst in an amount and under conditions sufficient to initiate the reaction between (A) and (B).
A process for preparing a polyurethane foam from (A) an organic isocyanate containing an average of at least two isocyanate groups per molecule or mixture of such isocyanates and (B) as a polyol, hydroxyl-containing component which is essentially free of water and which contains an average of at least two hydroxyl groups per molecule or a mixture of such components which comprises reacting components (A) and (B) in the presence of (C) a volatile, low boiling solvent as an auxilliary blowing agent and (D) an ar-sulfonium areneoxide as a catalyst in an amount and under conditions sufficient to initiate the reaction between (A) and (B).
Dependencies are inferred from the claim text.