Claims
- 1. A process for preparing flexible foam comprising reacting a reaction mixture comprising a polyisocyanate and a relatively high equivalent weight active hydrogen-containing material in the presence of a volatile blowing agent, wherein at least about 85 mole percent of said volatile blowing agent is 1,1,1-trichloroethane and the remaining being another volatile blowing agent having a boiling point of at least -15.degree. C. at 1 atmosphere pressure but below the maximum temperatures generated during the reaction to form the foam.
- 2. The process of claim 1 wherein said relatively high equivalent weight active hydrogen-containing material is a polyether.
- 3. The process of claim 2 wherein said reaction mixture further comprises water.
- 4. The process of claim 3 wherein said polyether is hydroxyl-terminated and nominally has an average of about 2 to about 4 hydroxyl groups per molecule.
- 5. The process of claim 4 in which the reaction mixture freely rises.
- 6. The process of claim 5 wherein the polyisocyanate is toluene diisocyanate or a prepolymer thereof.
- 7. The process of claims 6 wherein 1,1,1-trichloroethane constitutes at least about 95 mole percent of the volatile blowing agent.
- 8. The process of claim 7 wherein said volatile blowing agent consists essentially of 1,1,1-trichloroethane.
- 9. The process of claim 7 wherein said reaction mixture further comprises a silicone surfactant and a organometallic catalyst.
- 10. The process of claim 9 wherein the reaction mixture contains about 2 to about 8 parts by weight water per 100 parts by weight polyether and about 20 to about 40 parts by weight 1,1,1-trichloroethane.
- 11. The process of claim 4 in which the reaction mixture reacts in a closed mold.
- 12. The process of claim 11 wherein said volatile blowing agent consists essentially of 1,1,1-trichloroethane.
- 13. A process for preparing flexible foam comprising reacting a reaction mixture comprising a polyisocyanate and a relatively high equivalent weight active hydrogen-containing material in the presence of a volatile blowing agent, wherein the volatile blowing agent is a mixture of at least about 50 weight percent 1,1,1-trichloroethane, from about 0 to about 50 weight percent ethyl chloride or methylene chloride or mixtures thereof, and from about 0 to about 15 weight percent of another volatile blowing agent having a boiling point of at least -15.degree. C. at 1 atmosphere pressure but below the maximum temperature generated during the reaction to form the foam.
- 14. The process of claim 13 wherein said relatively high equivalent weight active hydrogen-containing material is a polyether.
- 15. The process of claim 14 wherein said reaction mixture further comprises water.
- 16. The process of claim 15 wherein said polyether is hydroxyl-terminated and nominally has an average of about 2 to about 4 hydroxyl groups per molecule.
- 17. The process of claim 16 wherein said volatile blowing agent is about 50-85 weight percent 1,1,1-trichloroethane and about 15-50 weight percent methylene chloride.
- 18. The process of claim 16 wherein said volatile blowing agent is about 50-85 weight percent 1,1,1-trichloroethane and about 15-50 weight percent ethyl chloride.
- 19. The process of claim 16 wherein the reaction mixture contains about 2 to about 5 parts of water per 100 parts by weight polyether.
- 20. The process of claim 1 wherein said volatile blowing agent having a boiling point of at least -15.degree. C. is selected from the group consisting of methylene chloride, ethyl chloride, CFC-11, CFC-113, CFC-114, CFC-123, CFC-123a, CFC-124, CFC-124a, CFC-133 (all isomers), CFC-134, CFC-134a, CFC-141b, CFC-142, CFC-151, pentane, heptane, hexane, perhalogenated propanes and mixtures thereof.
- 21. The process of claim 13 wherein said volatile blowing agent having a boiling point of at least -15.degree. C. is selected from the group consisting of CFC-11, CFC-113, CFC-114, CFC-123, CFC-123a, CFC-124, CFC-124a, CFC-133 (all isomers), CFC-134, CFC-134a, CFC-141b, CFC-142, CFC-151, pentane, heptane, hexane, perhalogenated propane.
Parent Case Info
This is a continuation in part, of application Ser. No. 364,930 filed June 12, 1989 and now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4742089 |
Naka et al. |
May 1988 |
|
Non-Patent Literature Citations (1)
Entry |
PCT, WO89/00594, 1/26/89. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
364930 |
Jun 1989 |
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