Claims
- 1. In a method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent comprising water, a cell stabilizer and a catalyst composition, the improvement which comprises employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR4## where R.sup.1 is a C.sub.1 -C.sub.10 alkyl; R.sup.2 is hydrogen, methyl or ethyl and R.sup.3 is hydrogen or a C.sub.1 -C.sub.20 organic group optionally containing an ether group provided that when R.sup.1 is methyl, R.sup.2 and R.sup.3 are not both hydrogen or a hydrogen and a methyl, in combination with a boron compound of the formula
- R.sub.n B(OH).sub.3-n
- where n=0 or 1, and R=C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl, or C.sub.6 -C.sub.10 aryl.
- 2. The method of claim 1 in which the boron compound is boric acid, phenylboronic acid or isopropylboronic acid.
- 3. The method of claim 1 in which the boron compound is boric acid.
- 4. The method of claim 3 in which R.sup.2 is methyl or ethyl.
- 5. The method of claim 3 in which R.sup.3 is hydrogen, methyl or ethyl.
- 6. The method of claim 3 in which R.sup.1 is methyl or ethyl.
- 7. The method of claim 1 in which R.sup.1 is methyl or ethyl.
- 8. The method of claim 1 in which R.sup.2 is methyl or ethyl.
- 9. The method of claim 1 in which R.sup.3 is hydrogen, methyl or ethyl.
- 10. In a method for preparing a polyurethane foam which comprises reacting an organic polyisocyanate and a polyol in the presence of a blowing agent comprising water, a cell stabilizer and a catalyst composition, the improvement which comprises employing a catalyst composition consisting essentially of a hydroxy-functional imidazole of the following formula I ##STR5## where R.sup.1 is methyl or ethyl; R.sup.2 is methyl and R.sup.3 is hydrogen or methyl, provided that when R.sup.1 is methyl, R.sup.3 is not hydrogen, in combination with boric acid.
- 11. The method of claim 10 in which R.sup.1 is ethyl, R.sup.2 is methyl and R.sup.3 is hydrogen.
- 12. The method of claim 10 in which R.sup.1 is ethyl and R.sup.2 and R.sup.3 are methyl.
- 13. The method of claim 10 in which R.sup.1, R.sup.2 and R.sup.3 are methyl.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 08/298,629 filed 31 Aug. 1994 now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
671012 |
Oct 1964 |
BEX |
2301554 |
Sep 1976 |
FRX |
1153308 |
May 1969 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Koehler, Jackson, Lienhard "A Search for the Addition of Monoentate Nucleophiles to Boric and Benzeneboronic Acids in Water" J. Org. Chem., vol. 37, No. 14, 1972. |
CA 99 (6) 39229a. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
298629 |
Aug 1994 |
|