Claims
- 1. In a process for the preparation of a cellular polymer in which te major recurring polymer unit is isocyanurate which process comprises bringing together, in the presence of a blowing agent, a polyisocyanate, a tertiary amine trimerization catalyst, and a minor amount of a polyol, wherein the improvement consists essentially of employing as the trimerization catalyst the following ingredients in combination:
- a. from 0.01 to 0.06 equivalent per equivalent of said polyisocyanate of a monomeric epoxide;
- b. from 0.001 to 0.02 equivalent per equivalent of said polyisocyanate of a tertiary amine trimerization catalyst containing a dimethylamino group; and
- c. from 0.001 to 0.02 equivalent per equivalent of said polyisocyanate of a glycine salt having the formula: ##SPC7##
- wherein M is an alkali metal, R.sub.1 is selected from the class consisting of hydrogen and alkyl having from 1 to 12 carbon atoms, inclusive, R.sub.2 is selected from the class consisting of hydrogen, alkyl having from 1 to 12 carbon atoms, inclusive, and --CH.sub.2-- COO.sup..sup.- M.sup..sup.+, and R.sub.3 is selected from the class consisting of hydrogen and the group ##EQU2##
- 2. The process according to claim 1 wherein said polyisocyanate is polymethylene polyphenyl isocyanate containing about 30 percent to about 85 percent by weight of methylenebis(phenyl isocyanate).
- 3. The process according to claim 1 wherein the polyisocyanate has an acidity less than about 0.10 percent.
- 4. The process according to claim 1 wherein the polyisocyanate has been previously mixed at room temperature with about 0.25 equivalent to about 1.0 equivalent of a monomeric epoxide per equivalent of acid present in said polyisocyanate to reduce acidity to less than about 0.10 percent.
- 5. The process according to claim 4 wherein said monomeric epoxide is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
- 6. The process according to claim 1 wherein the epoxide is a glycidyl ether of a novolac resin having a functionality of at least two.
- 7. The process according to claim 1 wherein the tertiary amine is N,N-dimethylcyclohexylamine.
- 8. The process according to claim 1 wherein said glycine salt is present in the form of a solution from about 25 percent to about 75 percent in a diluent.
- 9. The process according to claim 8 wherein said diluent is diethylene glycol.
- 10. The process according to claim 1 wherein the glycine salt is sodium N-(2-hydroxy-5-nonylphenyl)methyl-N-methyl glycinate.
- 11. In a process for the preparation of a cellular polymer in which the major recurring polymer unit is isocyanurate which process comprises bringing together, in the presence of a blowing agent, a polyisocyanate, a tertiary amine trimerization catalyst, and a minor amount of a polyol, wherein the improvement consists essentially of employing as the trimerization catalyst the following ingredients:
- a. from 0.01 to 0.06 equivalent per equivalent of said polyisocyanate of a glycidyl ether of a novolac resin having a functionality of at least two;
- b. from 0.001 to 0.02 equivalent per equivalent of said polyisocyanate of dimethylcyclohexylamine; and
- c. from 0.001 to 0.02 equivalent per equivalent of said polyisocyanate of sodium N-2-hydroxy-5-nonylphenyl)methyl-N-methyl glycinate.
- 12. The process according to claim 11 wherein the polyisocyanate is polymethylene polyphenyl isocyanate containing from about 30 percent to about 85 percent by weight of methylenebis(phenyl isocyanate).
- 13. The process according to claim 12 wherein said polyisocyanate has an acidity less than about 0.10 percent.
- 14. The process according to claim 12 wherein said polyisocyanate had been previously mixed at room temperature with about 0.25 equivalent to about 1.0 equivalent of a monomeric epoxide per equivalent of acid present in said polyisocyanate to reduce acidity to less than about 0.10 percent.
- 15. The process according to claim 14 wherein said monomeric epoxide is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
- 16. The process according to claim 11 wherein said glycine salt is present in the form of a solution from about 25 percent to about 75 percent in a diluent.
- 17. The process according to claim 16 wherein said diluent is diethylene glycol.
CROSS REFERENCE TO RELATED APPLICATION
This application is a division of our copending application Ser. No. 437,779 filed Jan. 30, 1974 now U.S. Pat. No. 3,903,018.
US Referenced Citations (7)
Divisions (1)
|
Number |
Date |
Country |
Parent |
437779 |
Jan 1974 |
|