Claims
- 1. A composition useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and a gas selected from the group consisting of a fluorohydrocarbon, perfluorocarbons, fluoroethers, hydrofluoropolyethers and mixtures thereof.
- 2. The composition of claim 1 useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and wherein the perfluorocarbons are selected from the group of octofluoropropane, hexafluoroethane, octafluorocyclobutane, perfluoropropylene, tetrafluoromethane and mixtures thereof.
- 3. The composition of claim 1 useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and wherein the fluoroethers are selected from the group consisting of bis(2,2,2trifluoroethyl)ether, n-butyl-1,1,2,2-tetrafluoro ethyl ether, difluoromethyl 2,2,2-trifluoroethyl ether, ethyl 1,1,2,2-tetrafluoroethyl ether, 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy) propane and mixtures thereof.
- 4. The composition of claim 1 useful as a blowing agent having no flash point or reduced combustibility wherein the fluoroether is a mixture of methyl nonafluoroisobutyl ether and methyl nonafluorobutyl ether.
- 5. The composition of claim 1 useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and wherein the hydrofluoropolyethers are selected from the group consisting of 1-difluoromethoxy-bis-(difluoromethyl ether, 1-difluoromethoxy-1,1,2,2-tertrafluoroethyl difluoromethyl ether and mixtures thereof.
- 6. A composition of claim 1 useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and wherein the fluorohydrocarbon is selected from the group consisting of 1,1,1,3,3 pentafluoropropane, 1,1,1,2,3,3,3 heptafluoropropane, 1,1,1,3,3,3 hexafluoropropane, 1,1,1,3,3 pentafluorobutane and 1,1,1,2 tetrafluoroethane and mixtures thereof.
- 7. The composition of claim 6 useful as a blowing agent having no flash point or reduced combustibility comprising about 80-90% of 2-chloropropane and about 10-20% of 1,1,1,3,3,3 hexafluoropropane.
- 8. The composition of claim 6 useful as a blowing agent having no flash point or reduced combustibility comprising greater than 0.5% to less than 50.2% of 2-chloropropane and the balance being 1,1,1,3,3 pentafluoropropane.
- 9. The composition of claim 8 useful as a blowing agent having no flash point or reduced combustibility comprising about 16.5 to 43.5% of 2-chloropropane and about 83.5 to 56.5% of 1,1,1,3,3 pentafluoropropane.
- 10. The composition of claim 6 useful as a blowing agent have no flash point or reduced combustibility comprising greater than 0.5% to less than 93% 2-chloropropane and the balance being 1,1,1,2,3,3,3 heptafluoropropane.
- 11. The composition of claim 10 useful as a blowing agent having no flash point or reduced combustibility comprising about 58 to 93% 2-chloropropane and about 42 to 7% 1,1,1,2,3,3,3 heptafluoropropane.
- 12. An azeotrope-like mixture at one atmosphere comprising about 50-60% 2-chloropropane and about 40-50% 1,1,1,3,3 pentafluorobutane.
- 13. An azeotrope-like mixture at one atmosphere of pressure comprising about 54% 2-chloropropane and about 46% 1,1,1,3,3 pentafluorobutane.
- 14. An azeotrope-like mixture at one atmosphere of pressure comprising about 78% 2-chloropropane and about 22% of a mixture of methyl nonafluoroisobutyl ether and methyl nonafluorobutyl ether.
- 15. A polyisocyanurate foam or polyurethane modified polyisocyanurate foam having a mainly closed cell structure, and comprising closed cells wherein 2-chloropropane gas is enclosed in combination with a different gas or gases which lower the combustibility of the 2-chloropropane.
- 16. A polyisocyanurate foam or a polyurethane modified polysisocyanurate foam, according to of claim 15, wherein the gas present in the cells comprises at least 5% by weight of 2-chloropropane.
- 17. A method for preparing mainly closed, cell shaped polyisocyanurate foam or polyurethane modified polyisocyanurate foam, wherein foam formation is performed with the use of a physical blowing agent comprising 2-chloropropane along with another gas which lowers the combustibility of the 2-chloropropane.
- 18. The method according to claim 17, wherein said physical blowing agent comprises at least 5% of 2-chloropropane.
- 19. The method according to claim 18, wherein 2-chloropropane is used together with a hydrofluorocarbon blowing agent.
- 20. The method according to claim 18, wherein 2-chloropropane is used in combination with other inert compounds having a relatively low boiling point or sublimation point.
- 21. The method according to claim 17, wherein the amount of physical blowing agent used is comprised of between 1 and 50 parts by weight per 100 parts by weight of said polyisocyanurate foam or polyurethane modified polyisocyanurate foam.
- 22. The method according to claim 19, wherein said hydrofluorocarbon blowing agent is selected from the group consisting of tetrafluoroethane, pentafluoropropane, pentafluorobutane, heptafluoropropane, hexafluoropropane and pentafluoroethane.
- 23. The method according to claim 20, wherein said inert compound is selected from the group consisting of pentane, isopentane, cyclopentane, cyclopentene, methyl formate, dimethylether and diethylether.
- 24. The method according to claim 21, wherein said physical blowing agent is used in an amount of between 1 and 30 parts by weight per 100 parts by weight of polyisocyanurate foam or polyurethane modified polyisocyanurate foam.
- 25. The method according to claim 17 wherein the other gas which lowers combustibility of the 2-chloropropane is a mixture of methyl nonafluoroisobutyl ether and methyl nonafluorobutyl ether.
RELATED APPLICATIONS
[0001] This application is related to Provisional Application Serial No. 60/293,011 filed May 23, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60293011 |
May 2001 |
US |