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AssigneeThe Dow Chemical Company
InventorsRobert B. Turner, Richard D. Peffley, Raymond A. Plepys, Ralph D. Priester, Manuel Gonzales, Jr., Kimbley A. Bushman
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This invention comprises a process whereby an amine functional compound having an equivalent weight of at least about 400 is reacted with an excess of a polyisocyanate to form an isocyanate-terminated prepolymer or quasi prepolymer, which polymer or quasi prepolymer is reacted with an isocyanate-reactive material which is preferably a relatively low equivalent weight polyol or mixture thereof with an additional amount of said amine functional compound or a relatively high equivalent weight polyol to form a polyurea containing polymer which is preferably non-cellular or microcellular.
A process for preparing a polyurea or polyurea-polyurethane polymer comprising reacting an amine functional compound having an equivalent weight of at least about 400 with an excess of a polyisocyanate to form an isocyanate-terminated prepoymer or quasi-prepolymer, and then reacting said isocyanate-terminated prepolymer or quasi-prepolymer with an isocyanate reactive material to form a polyurea and/or polyurea-polyurethane polymer.
Dependencies are inferred from the claim text.