Process for producing froth polyurethane foam
AssigneeArco Chemical Technology, L.P.
InventorRobert D. Duffy
Life of this patent
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Abstract
High quality, consistent polyurethane froth foams, both filled and unfilled, are prepared by directing polyol, isocyanate, and optionally other polyurethane-forming ingredients to a high pressure mix head prior to introducing the mixture to a froth foaming head. Changes in stoichiometry may be made rapidly without shut-down. An in-line blender incorporated filler into the polyol stream minimizing density differentials normally encountered in the holding tank, maintaining low and reproducible viscosity, and allowing for greater amounts of filler than otherwise possible.
Claims5
A multilayer froth foam product comprising two or more individual layers of flexible polyurethane froth foam, wherein an interface between at least two of said two or more individual layers of polyurethane froth foam is substantially free of coalescence.
A multi-layer froth foam product comprising two or more individual layers of polyurethane froth foam, wherein an interface between at least two of said two or more individual layers of polyurethane froth foam is substantially free of coalescence, second and subsequent layers of said two or more layers of polyurethane foams having been prepared by contacting a reactive polyurethane froth directly with a prepared foam layer such that the two layers are in immediate contiguous contact.
Dependencies are inferred from the claim text.