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US 10,494,498 B2Granted
Methods for preparing open-celled polyurethane foams, systems for use therein, and open-celled polyurethane foams produced thereby
AssigneeCovestro LLC
InventorsBin Lee, Paul O. Barley
Life of this patent
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Abstract
Disclosed are methods and systems for preparing open-celled polyurethane foams by a discontinuous box foam process in which (a) a polyurethane foam-forming composition is deposited into a container having a gas-permeable base and (b) the polyurethane-foam forming composition is allowed to form an open-celled polyurethane foam in the container. In these methods and systems, the gas-permeable base is heated before, during, and/or after step (a) and heating is continued during at least a portion of step (b).
Claims11
A method for preparing an open-celled polyurethane foam, comprising:
- (a) depositing a polyurethane foam-forming composition into a box comprising a gas-permeable base and at least 4 sidewalls;
- and
- (b) allowing the polyurethane-foam forming composition to form an open-celled polyurethane foam in the container,
- wherein during step (a) and during step (b) the temperature of the gas-permeable base is maintained at least 10° C. higher than the temperature of other portions of the box, and
- wherein the method is discontinuous.
2 more elements
Dependencies are inferred from the claim text.