Claims
- 1. A process for preparing a non-polluting sand core for production of metal castings comprising the steps of mixing said sand with an oxazoline in a proportion of about 0.5-5.0% by weight of the sand and a mixture of 3-7% or up to 10% by weight of peroxide alone or in combination with metal driers based on the weight of said oxazoline, and placing the mixture thereby obtained in a mold to harden at ambient temperatures wherein said oxazoline is (a) a mono-oxazoline corresponding to the formula ##EQU10## wherein R.sup.1 and R.sup.2 are methyl, ethyl, hydroxymethyl or acyloxymethyl corresponding to the formula ##EQU11##and are the same or different, R is an alkenyl group of from 1 to 18 carbon atoms, and X is H.sub.2, or (b) a bis- or tris-oxazoline corresponding to the formula ##EQU12##where R.sup.3 is the group ##EQU13##wherein X.sup.1 is any divalent or trivalent unsaturated aliphatic hydrocarbon group of from 0 to 32 carbon atoms, and when X.sup.1 is divalent, R.sup.4 is hydrogen and when X.sup.1 is trivalent, R.sup.4 is the group ##EQU14##wherein Y is an unsaturated hydrocarbon of 16 carbon atoms or (c) mixtures thereof.
- 2. The process of claim 1 wherein R.sup.1 and R.sup.2 are methyl.
- 3. The process of claim 1 wherein R.sup.1 and R.sup.2 are hydroxymethyl.
- 4. The process of claim 1 wherein R.sup.1 is ethyl and R.sup.2 is hydroxymethyl.
- 5. The process of claim 1 wherein R.sup.1 and R.sup.2 are the acyloxymethyl group ##EQU15##
- 6. The process of claim 1 wherein said binder comprises a mixture of said mono-oxazoline and about 5 to about 95% of said bis-oxazoline or
- 7. The process of claim 1 wherein said binder is said bis- or
- 8. The process of claim 1 wherein R is an alkenyl group of from 1 to 18
- 9. The process of claim 1 wherein X' is divalent and R.sup.4 is hydrogen.
- 10. The process of claim 1 wherein X' is trivalent and R.sup.4 is the group
- 11. The process of claim 1 wherein said binder is a mixture of said
- 12. The process of claim 1 wherein said binder is a mixture of said
- 13. The process of claim 1 wherein said binder is a mixture of said
- 14. The process of claim 1 wherein said binder is a mixture of said bis-oxazoline and said tris-oxazoline.
Parent Case Info
This is a division of copending application Ser. No. 378,366, filed 7/11/73, now U.S. Pat. No. 3,919,135 granted Nov. 11, 1975.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
378366 |
Jul 1973 |
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