Claims
- 1. A foam forming composition comprising:a) an organic isocyanate, b) an isocyanate reactive composition containing at least 40% by weight based on the total weight of the isocyanate reactive composition of an aromatic polyester polyol having an average functionality of less than 3, c) a C1 to C4 hydrofluorocarbon blowing agent, and d) an organic phosphorus compound.
- 2. A foam forming composition, as claimed in claim 1 wherein the organic isocyanate is polyphenylene polymethylene polyisocyanate.
- 3. A foam forming composition as claimed in claim 2 wherein the isocyanate contains diphenyl methane diisocyanate in an amount equal to from about 15% to about 42% by weight based on the total weight of the isocyanate.
- 4. A foam forming composition as claimed in claim 1 wherein the amount of isocyanate is equal to from about 30% to about 75% by weight based on the total weight of the foam forming composition.
- 5. A foam forming composition as claimed in claim 1 wherein the aromatic polyester polyol in the isocyanate reactive composition is prepared by reaction of an aromatic polycarboxylic acid and a polyhydric alcohol.
- 6. A foam forming composition as claimed in claim 1 wherein the isocyanate reactive composition also contains a compound selected from the group consisting of polyether polyols, aliphatic polyester polyols, hydrogen-terminated polythioesters, polyamides, polyester amides, polycarbonates, polyacetals, polyolefins and polysiloxanes.
- 7. A foam forming composition as claimed in claim 1 wherein the C1 to C4 hydrofluorocarbon blowing agent is selected from the group consisting of difluoromethane, trifluoromethane, 1,1-difluoroethane, 1,1,1-trifluroethane, 1,1,1,2-tetrafluoroethane, pentafluoroethane, any isomer of pentafluoropropane, any isomer of heptafluoropropane, any isomer of pentafluorobutane, 1,1,1,4,4,4-hexafluorobutane, 1,1,1,3,3-pentafluoropropane and 1,1,1,3,3-pentaflurobutane.
- 8. A foam forming composition as claimed in claim 7 wherein the hydrofluorocarbon blowing agent is 1,1,1,3,3-pentafluoropropane.
- 9. A foam forming composition as claimed in claim 1 wherein the composition contains water as an additional blowing agent.
- 10. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is selected from the group consisting of phosphates, phosphites, phosphonates, polyphosphates, polyphosphites, polyphosphonates, and ammonium polyphosphate.
- 11. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is a phosphate compound having the following formula: where R1, R2 and R3 are independently selected from alkyl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
- 12. A foam forming composition as claimed in claim 11 wherein R1, R2 and R3 are independently selected from C1-C12 alkyl, C1-C12 halogen substituted alkyl, phenyl, cresyl, halogen substituted phenyl and C5-C10 cycloalkyl groups.
- 13. A foam forming composition as claimed in claim 11 wherein R1, R2 and R3 are C1 to C8 alkyl or C1 to C8 halogen substituted alkyl.
- 14. A foam forming composition as claimed in claim 11 wherein R1, R2 and R3 are C1 to C4 alkyl or C1 to C4 halogen substituted alkyl.
- 15. A foam forming composition as claimed in claim 11 wherein R1, R2 and R3 are phenyl.
- 16. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is a phosphite compound having the following formula: where R1, R2 and R3 are independently selected from H, alkyl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
- 17. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are independently selected from C1-C12 alkyl, C1-C12 halogen substituted alkyl, phenyl, cresyl, halogen substituted phenyl and C5-C10cycloalkyl groups.
- 18. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are independently selected from C1-C8 alkyl or C1-C8 halogen substituted alkyl.
- 19. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are independently selected from C1-C4 halogen substituted alkyl.
- 20. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are phenyl.
- 21. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is a phosphonate compound having the following formula: where R1, R2 and R3 are independently selected from alkyl, aryl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
- 22. A foam forming composition as claimed is claim 21 wherein R1, R2 and R3 are independently selected from C1-C12 alkyl, C1-C12 halogen substituted alkyl, phenyl, cresyl, halogen substituted phenyl and C5-C10 cycloalkyl groups.
- 23. A foam forming composition as claimed in claim 21 wherein R1, R2 and R3 are independently selected from C1-C8 alkyl or C1-C8 halogen substituted alkyl.
- 24. A foaming forming composition as claimed in claim 21 wherein R1, R2 and R3 are independently selected from C1-C4 alkyl or C1-C4 halogen substituted alkyl.
- 25. A foam forming composition as claimed in claim 21 wherein R1, R2 and R3 are phenyl.
- 26. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound contains at least one isocyanate reactive hydrogen group selected from hydroxyl, amino and thio.
- 27. A foam forming composition as claimed in claim 1 wherein the amount of organophospohorus compound used is such that the amount of phosphorous in the composition is equal to from about 0.01 to about 2.5% by weight, based on the total weight of the composition.
- 28. A foam forming composition as claimed in claim 27 wherein the amount of organophosphorous compound used is such that the amount of phosphorous in the composition is from about 0.025 to about 1.5% by weight, based on the total weight of the composition.
- 29. A foam forming composition as claimed in claim 27 wherein the amount of organophosphorous compound used is such that the amount of phosphorous in the composition is from about 0.05 to about 1.0% by weight, based on the total weight of the composition.
- 30. A rigid polyurethane foam having a density of from 1.2 to 4.2 lb/cu ft prepared from the composition of claim 1.
Parent Case Info
This appln claims benefit of Prov. No. 60/053,701 filed Jul. 25, 1997.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
4201269 |
Jul 1993 |
DE |
02 086631 |
Mar 1990 |
JP |
WO9612758 |
May 1996 |
WO |
WO9614354 |
May 1996 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/053701 |
Jul 1997 |
US |