Claims
- 1. A blowing agent composition comprising:
(a) at least one hydrofluorocarbon having a boiling point of 30° C. or higher and lower than about 120° C.; (b) at least one hydrofluorocarbon having a boiling point lower than 30OC; and (c) at least one component selected from low-boiling alcohols and low-boiling carbonyl compounds.
- 2. The composition of claim 1, wherein the composition is essentially free of low-boiling carbonyl compounds.
- 3. The composition of claim 1, wherein the low-boiling alcohol is ethanol.
- 4. The composition of claim 1, wherein the low-boiling carbonyl compound is acetone.
- 5. The composition of claim 1, further comprising at least one additional blowing agent selected from a group consisting of carbon dioxide, nitrogen, argon, water, air, helium, ethers, methane, ethane, propane, n-butane, isobutane, n-pentane, isopentane, neopentane, cyclobutane, and cyclopentane; wherein additional blowing agent(s) comprise 50 weight-percent or less of the blowing agent composition.
- 6. The composition of claim 1, further comprising carbon dioxide wherein said carbon dioxide is 50 weight-percent or less of the blowing agent composition.
- 7. The composition of claim 1, wherein (a) is 1,1,1,3,3-pentafluorobutane.
- 8. The composition of claim 1, wherein (b) is 1,1,1,2-tetrafluoroethane.
- 9. The blowing agent composition of claim 1, further comprising water.
- 10. The blowing agent composition of claim 1, wherein at least one of (a) is 1,1,1,3,3-pentafluorobutane; at least one of (b) is 1,1,1,2-tetrafluoroethane; and at least one of (c) is ethanol.
- 11. The blowing agent composition of claim 10; further comprising 50 weight-percent or less carbon dioxide, based on blowing agent composition weight.
- 12. A process for producing a polymeric foam comprising the steps:
(a) forming a foamable polymer composition from a polymer and the blowing agent composition of claim 1; and (b) expanding said foamable polymer composition into a polymeric foam.
- 13. A polymeric foam that comprises:
(a) a polymer; (b) a hydrofluorocarbon having a boiling point of 30° C. or higher and lower than about 120° C.; (c) a hydrofluorocarbon having a boiling lower than 30° C.; and (d) at least one component selected from low-boiling alcohols and low-boiling carbonyl compounds.
- 14. The polymeric foam of claim 13, wherein the polymer is selected from the group consisting of polystyrene, polypropylene, polyethylene, polycarbonate, and polyester.
- 15. The polymeric foam of claim 13, wherein the polymer is polystyrene.
- 16. The polymeric foam of claim 13, wherein the polymeric foam is greater than 90 percent closed-cell according to ASTM D2856-A.
- 17. The polymeric foam of claim 13, wherein the polymeric foam has a thermal conductivity of less than 35 milliwatt per meter-Kelvin 90 days after preparation, as determined by ASTM method C-518-98 using a sample temperature of 24° C.
- 18. A foamable polymer composition comprising a polymer that has the blowing agent composition of claim 1 dispersed therein.
CROSS REFERENCE STATEMENT
[0001] This application claims the benefit of U.S. Provisional Application No. 60/257,483, filed Dec. 21, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60257483 |
Dec 2000 |
US |