Rigid polyurethane foams and method to form said foams using low molecular weight diols and triols
AssigneeEssex Specialty Products, Inc.
InventorRoney J. Matijega
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Abstract
The present invention is a polyurethane foam comprising the reaction product of a first reactant comprised of a polyisocyanate having an average isocyanate functionality of at least 2 and a second reactant comprised of a low molecular weight compound that has at least two to, at most, three groups containing an active hydrogen and water, wherein the reaction product is formed essentially in the absence of a cross-linking polyol and the polyurethane foam is substantially rigid. The invention is also a method of forming the polyurethane foam by contacting the first and second reactant for a time and temperature sufficient to form the foam.
Claims24
A method for forming a polyurethane foam comprising:
- contacting a first reactant comprised of a polyisocyanate having an average isocyanate functionality of at least 2 and a second reactant comprised of a low molecular weight compound that has at least two to, at most, three groups containing an active hydrogen in the presence of water for a time sufficient to form a substantially rigid foam wherein at least one of the active hydrogen containing groups is a primary active hydrogen containing group and at least one other active hydrogen containing group is a secondary active hydrogen containing group, provided the foam is formed essentially in the absence of a cross-linking polyol having a hydroxyl functionality greater than 3.
A polyurethane foam comprising the reaction product of a first reactant comprised of a polisocyanate having an average isocyanate functionality of at least 2 and a second reactant comprised of a low molecular weight compound that has at least two to, at most, three groups containing an active hydrogen and water wherein at least one of the active hydrogen containing groups is a primary active hydrogen containing group and at least one other hydrogen containing group is a secondary active hydrogen containing group, wherein the reaction product is formed essentially in the absence of a cross-linking polyol and the polyurethane foam is substantially rigid.
Dependencies are inferred from the claim text.