Polyisocyanate-based foam and blowing agent therefor
AssigneeIntercool Energy Corporation
InventorRichard Stevenson
Life of this patent
Estimating the term…
Abstract
A blowing agent for use in preparing a polyisocyanate-based foam which comprises a major portion of HCFC-123, a minor portion of HCFC-141b, a branched or unbranched aliphatic alkane having from 6 to 10 carbon atoms or mixtures thereof, and a polyether component which reduces cell size in the resultant polyisocyanate-based foam. The polyether component includes a mixture of polymerized, oxidized perfluorinated propene polyethers having a molecular weight distribution of from about 400 to about 1800 units. Alternatively, the polyether component can be added to the foam precursor materials separate from the blowing agent. Blowing agents and polyether additives for polyurethane-based foams are also provided.
Claims20
A process for preparing a polyisocyanate-based foam that has reduced flammability and superior cell structure without the use of CFC's, by reacting a polyisocyanate with an isocyanate-reactive material, a polyether component, and a blowing agent, wherein said blowing agent comprises a base formulation of one or more hydrogen-containing chlorofluoroalkane (HCFC), and about 1 to 30 mole percent of a hydrocarbon selected from the group consisting branched and unbranched aliphatic alkanes having from 6 to 10 carbon atoms and mixtures thereof, said polyether component being present in an amount effective to reduce the cell size of a resulting polyisocyanate-based foam and comprising a mixture of polymerized, oxidized perfluorinated propene polyethers having a wide molecular weight distribution.
A composition comprising a blend of isocyanate-reactive or polyurethane-reactive material, water, a minor amount of a blowing agent and a polyether component, wherein said blowing agent comprises a base mixture of about 80 to 99 mole percent hydrogen-containing chlorofluoroalkane (HCFC) or mixtures thereof, and about 1 to 20 mole percent of a hydrocarbon selected from the group consisting of branched and unbranched aliphatic alkanes having from 6 to 10 carbon atoms and mixtures thereof, said polyether component being present in an amount effective to reduce cell size in a resultant foam and comprising a mixture of polymerized, oxidized perfluorinated propene polyethers having a molecular weight distribution of from about 400 to about 1800 units.
A process for preparing a polyurethane-based foam that has reduced flammability and superior cell structure without the use of CFC's, by reacting a polyurethane with a urethane-reactive material, a polyether component, and a blowing agent, wherein said blowing agent comprises a base formulation of one or more hydrogen-containing chlorofluoroalkane (HCFC), and about 1 to 30 mole percent of a hydrocarbon selected from the group consisting branched and unbranched aliphatic alkanes having from 6 to 10 carbon atoms and mixtures thereof, said polyether component being present in an amount effective to reduce the cell size of a resulting foam and comprising a mixture of polymerized, oxidized perfluorinated propene polyethers having a wide molecular weight distribution.
Dependencies are inferred from the claim text.