Rigid foam compositions and method employing methyl formate as a blowing agent
AssigneeFoam Supplies, Inc.
InventorsTimothy T. Kalinowski, David G. Keske, Victor Matimba, David L. Modray, Mark Schulte
Life of this patent
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Abstract
A method for producing a rigid, closed-cell polyurethane foam having a free-rise density of from about 1.3 lbs./ft.3 to about 4 lbs./ft.3 and exhibiting a shrinkage of less than 10%, comprises mixing together an isocyanate, a methyl formate blowing agent and at least one polyol having a hydroxyl number of from about 150 to about 800 and being selected from the group consisting of polyalkoxylated amines, polyalkoxylated ethers, and polyester polyols, to form a reaction mixture that is curable to produce such foam.
Claims34
A method for producing a rigid, closed-cell polyurethane foam having a free-rise density of from about 1.3 lbs./ft.3 to about 4 lbs./ft.3 and exhibiting a shrinkage of less than 10%, comprising mixing together:
- (a) an isocyanate,
- (b) at least one polyol having a hydroxyl number of from about 150 to about 800 and being selected from the group consisting of polyalkoxylated amines, polyalkoxylated ethers, and polyester polyols, and
- (c) a blowing agent selected from the group consisting of methyl formate, derivatives of methyl formate, precursors of methyl formate, and combinations thereof;
- to form a reaction mixture curable to produce the foam.
A reaction mixture curable to form a rigid, closed-cell polyurethane foam having a free-rise density of from about 1.3 lbs./ft.3 to about 4 lbs./ft.3 and exhibiting a shrinkage of less than 10%, comprising:
- (a) an isocyanate,
- (b) at least one polyol having a hydroxyl number of from about 150 to about 800 and being selected from the group consisting of polyalkoxylated amines, polyalkoxylated ethers, and polyester polyols, the at least one polyol making up from 50% by weight to 100% by weight of all polyols in the reaction mixture, and
- (c) a blowing agent selected from the group consisting of methyl formate, derivatives of methyl formate, precursors of methyl formate, and combinations thereof.
A rigid, closed-cell polyurethane foam having a free-rise density of from about 1.3 lbs./ft.3 to about 4 lbs./ft.3 and exhibiting a shrinkage of less than 10%, comprising cells containing gas, at least about 80% by weight of the gas being methyl formate and carbon dioxide.
Dependencies are inferred from the claim text.