Claims
- 1. A process for preparing foundry cores and molds comprising the steps of (a) mixing a foundry aggregate with an ortho-substituted phenol-formaldehyde polymerizable binder capable of being oxidatively coupled, a metal salt catalyst therefor selected from the group consisting of a salt of lead, manganese, cobalt II or copper I and an amine, (b) placing the mixture in a mold or core box and (c) passing an oxygen source through the mixture to effect oxidative polymerization of the binder and (d) removing the core or mold from the core box or mold.
- 2. The method of claim 1 wherein the resin is a titanium catalyzed phenol-formaldehyde resin.
- 3. The method of claim 1 wherein the binder is used in a ratio of about 0.1 to 10.0 parts per 100 parts of aggregate.
- 4. The method of claim 1 wherein the binder is used in a ratio of about 1-3 parts per 100 parts of aggregate.
- 5. The method of claim 1 wherein the amine is a tertiary amine.
- 6. The method of claim 5 wherein the amine is a pyridine.
- 7. The method of claim 5 wherein the amine is a substituted pyridine.
- 8. The method of claim 7 wherein the amine is 2-(2-dimethylamino)ethylpyridine.
- 9. The method of claim 7 wherein the amine is 4,4-trimethylenepyridine.
- 10. The method of claim 5 wherein the amine is N,N,N',N'-tetramethylethylenediamine.
- 11. The method of claim 5 wherein the amine is N,N,N',N'-tetramethyl-1,3-butanediamine.
- 12. The method of claim 5 wherein the amine is used in an amount of about 1.5 to 30% based on the weight of the polymerizable binder formulation.
- 13. The method of claim 12 wherein the amine is used in an amount of about 18%.
- 14. The composition of claim 1 wherein the metal salt catalyst is a salt of lead, manganese, cobalt II, or copper I.
- 15. The method of claim 1 wherein the salt is a cuprous halide, cuprous acetate, cuprous sulfate or cuprous oxide.
- 16. The method of claim 1 wherein the catalyst is present in a mole ratio of 1 to 1-20 parts of amine.
Parent Case Info
This is a division of copending application Ser. No. 283,718, filed July 16, 1981, now U.S. Pat. No. 4,393,152, issued July 12, 1983.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
283718 |
Jul 1981 |
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