Flame resistant rigid polyurethane foams blown with hydrofluorocarbons
First Claim
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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.
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Abstract
Rigid polyurethane foams having improved flame resistance are disclosed. The foams are prepared from a composition containing (a) an isocyanate, (b) an isocyanate reactive composition containing an aromatic polyester polyol, (c) an organo phosphorus compound and (d) a C1 to C4 hydrofluorocarbon.
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Citations
30 Claims
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1. A foam forming composition comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
where R1, R2 and R3 are independently selected from alkyl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
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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.
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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.
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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.
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15. A foam forming composition as claimed in claim 11 wherein R1, R2 and R3 are phenyl.
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16. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is a phosphite compound having the following formula:
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where R1, R2 and R3 are independently selected from H, alkyl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
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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.
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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.
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19. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are independently selected from C1-C4 halogen substituted alkyl.
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20. A foam forming composition as claimed in claim 16 wherein R1, R2 and R3 are phenyl.
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21. A foam forming composition as claimed in claim 1 wherein the organophosphorus compound is a phosphonate compound having the following formula:
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where R1, R2 and R3 are independently selected from alkyl, aryl, halogen substituted alkyl, aryl, halogen substituted aryl and cycloalkyl groups.
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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.
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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.
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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.
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25. A foam forming composition as claimed in claim 21 wherein R1, R2 and R3 are phenyl.
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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.
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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.
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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.
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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.
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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.
Specification