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US 5,478,867 AGranted
Microporous isocyanate-based polymer compositions and method of preparation
AssigneeThe Dow Chemical Company
InventorRicky L. Tabor
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AssigneeThe Dow Chemical Company
InventorRicky L. Tabor
Estimating the term…
A novel microporous isocyanate-based xerogel composition is disclosed. The composition can be prepared by a method comprising (1) (1) admixing (a) a polyisocyanate component, (b) a substantially unreactive solvent, and, optionally, (c) a polymerization catalyst, water, an active-hydrogen compound or a mixture thereof, provided that (c) is included wherein (b) does not also function to catalyze polymerization; under reaction conditions sufficient to form a gel; and (2) removing the solvent under non-supercritical conditions sufficient to form a microporous xerogel composition. The compositions can be readily evacuated for use in thermal insulative applications such as vacuum panels, for uses such as appliance insulation, which show superior K-factor values when compared with, for example, conventional rigid polyurethane open-cell foams as used in similar applications.
A microporous polyurea xerogel composition having pores averaging less than about 50 microns in diameter and having a bulk density from about 1 to about 30 lb/ft.sup.3 (about 16.0 to about 481 Kg/m.sup.3).
A microporous polyurea xerogel composition prepared by a method comprising (1) admixing (a) a polyisocyanate component, (b) a substantially unreactive solvent, and (c) an aliphatic or aromatic polyamine compound;
A method of preparing a microporous polyurea xerogel composition comprising (1) admixing (a) a polyisocyanate component, (b) a substantially unreactive solvent, and (c) an aliphatic or aromatic polyamine compound;
Dependencies are inferred from the claim text.