Claims
- 1. A method for producing a flexible polyurethane foam which comprises reacting and foaming a reaction mixture containing: (a) an organic polyisocyanate; (b) a polyol; (c) a catalyst for the reaction of (a) and (b); (d) a blowing agent; and (e) a polyphosphate thermal condensate comprising the reaction product of an unsubstituted trialkylphosphate having the following structure: ##STR16## wherein R is CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7 or C.sub.4 H.sub.9 ; R' is a C.sub.5 to C.sub.10 hydrocarbon chain and n is 0, 1 or 2 with a 2-haloalkyl phosphate having the following structure: ##STR17## wherein x is Cl or Br; R" is H, CH.sub.3, CH.sub.2 Cl or CH.sub.2 Br; and R and n are defined above, said thermal condensate being present in an amount sufficient to impart flame retardancy to the resulting flexible polyurethane foam.
- 2. The method of claim 1 wherein the mole ratio of the unsubstituted trialkyl phosphate to the 2-haloalkyl phosphate is from about 1:1 to about 2:1.
- 3. The method of claim 1 wherein the unsubstituted trialkyl phosphate is trimethyl phosphate.
- 4. The method of claim 1 wherein the unsubstituted trialkyl phosphate is triethyl phosphate.
- 5. The method of claim 1 wherein the 2-haloalkyl phosphate is a tris (2-haloalkyl) phosphate.
- 6. The method of claim 1 wherein the tris (2-haloalkyl) phosphate is tris (2-chlorethyl) phosphate.
- 7. The method of claim 1 wherein the 2-haloalkyl phosphate is a mixture of ##STR18##
- 8. The method of claim 1 wherein said thermal condensates are soluble in said polyol.
- 9. The method of claim 1 wherein said thermal condensates are present in an amount of less than about 7 parts by weight per 100 parts of said polyol.
- 10. A flexible, flame retarded polyurethane foam produced by the process of claim 1.
Parent Case Info
This application is a division of our prior U.S. application Ser. No. 644,789, filed Dec. 29, 1975, now U.S. Pat. No. 4,097,559.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3896187 |
Weil |
Jul 1975 |
|
3959415 |
Shim et al. |
May 1976 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
644789 |
Dec 1975 |
|