Composite polyurethane foams and method of manufacture thereof
AssigneeWorld Properties, Inc.
InventorScott S. Simpson
Life of this patent
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Abstract
Integrally bonded composite polyurethane foams substantially free from coalescence and with no discernable bond or structural interface layer when viewed at 50× magnification can be formed by wet casting a second foamed polyurethane composition onto a first wet cast foamed polyurethane composition and simultaneously curing the cast foams. In a preferred embodiment, one curable polyurethane composition forms a slow recovery foam and the other curable polyurethane composition forms a resilient foam.
Claims14
A method for the manufacture of multiple layer polyurethane foams, which comprises:
- casting a first, foamed mixture comprising an organic isocyanate component, an active hydrogen-containing component reactive with the isocyanate component, a surfactant, and a catalyst onto a second, foamed mixture comprising an organic isocyanate component, an active hydrogen-containing component reactive with the isocyanate component, a surfactant, and a catalyst;
- and
- curing the resulting multiple layers to form a multiple layer, polyurethane foam having no discernible structural interface line between the layers when viewed at 50× magnification by SEM.
A multiple layer, polyurethane foam, comprising
- a first polyurethane foam layer;
- and
- a second polyurethane foam layer, wherein there is no discernible structural interface line between the layers when viewed at 50× magnification by SEM.
A multiple layer, polyurethane foam, comprising
- a first polyurethane foam layer;
- and
- a second polyurethane foam layer disposed on the first layer, wherein one or more cells span the boundary region between the layers wherein there is no discernible structural interface line between the layers when viewed at 50× magnification by SEM.
Dependencies are inferred from the claim text.