Hydrofluorocarbon blown foam and method for preparation thereof
AssigneeHoneywell International Inc.
InventorsMary Charlotte Bogdan, Leslie Bruce Bement, Barbara Ruth Decaire, Dennis Paul Konopa, Harold John Kieta, Rajiv Ratna Singh
Life of this patent
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Abstract
The invention relates to the addition of α-methyl styrene, isobutanol and/or isopropanol to reduce vapor pressure, improve k-factor, enhance the solubility of the blowing agent in the premix and/or improve the processing characteristics of polyurethane and polyisocyanurate closed-cell foams prepared with a blowing agent comprising a hydrofluorocarbon selected from the group consisting of 1,1,1,3,3-pentafluoropropane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof.
Claims15
A blowing agent composition comprising a hydrofluorocarbon selected from the group consisting of 1,1,1,3,3-pentafluoropropane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof, and from about 0.02 to about 0.5 weight percent, based on the total amount of blowing agent, of an additive selected from the group consisting of α-methyl styrene, isobutanol, isopropanol, and mixtures thereof.
A method of preparing a polyurethane or polyisocyanurate foam composition comprising reacting and foaming a mixture of ingredients which react to form polyurethane or polyisocyanurate foams in the presence of a blowing agent comprising:
- a hydrofluorocarbon selected from the group consisting of 1,1,1,3,3-pentafluoropropane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof;
- and from about 0.02 to about 0.5 weight percent, based on the total amount of blowing agent, of an additive selected from the group consisting of α-methyl styrene, isobutanol, isopropanol, and mixtures thereof.
A closed cell foam prepared from a polymer foam formulation containing a blowing agent comprising:
- a hydrofluorocarbon selected from the group consisting of 1,1,1,3,3-pentafluoropropane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof;
- and from about 0.02 to about 0.5 weight percent, based on the total amount of blowing agent, of an additive selected from the group consisting of α-methyl styrene, isobutanol, isopropanol, and mixtures thereof.
Dependencies are inferred from the claim text.