Claims
- 1. In the foundry process of mixing foundry sand with a binding amount of up to 10% by weight based on said sand of a no-bake binder to thereby form a foundry mix, said no-bake binder being (a) as a first part, a synthetic drying oil , and (b) as a second part, polyisocyanate; from 10-50 weight percent polyisocyanate being present based on the weight of drying oil, the improvement consisting of using as said drying oil a mono-oxazoline corresponding to the formula ##EQU9## wherein R.sup.1 and R.sup.2 are methyl, ethyl, hydroxymethyl or acyloxymethyl corresponding to the formula ##EQU10## and are the same or different, R is hydrogen or an alkyl or alkenyl group of from 1 to 18 carbon atoms, or a bis- or trisoxazoline corresponding to the formula ##EQU11## where R.sup.3 is the group ##EQU12## wherein X.sup.1 is any divalent or trivalent saturated or 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 ##EQU13## wherein Y is a saturated or unsaturated hydrocarbon of 16 carbon atoms.
- 2. The process of claim 1 wherein said drying oil is said mono-oxazoline wherein said mono-oxazoline is condensed with an ethylenically unsaturated monomer having a terminal Ch.sub.2 =C-- group in an amount of 1 to 50% by weight and wherein said condensate thereby obtained is further condensed with formaldehyde in an amount of about 3-10% by weight of said unsaturated monomer.
- 3. 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 tris-oxazoline.
- 4. The process of claim 1 wherein said oxazoline is a mono-oxazoline.
- 5. The process of claim 1 wherein said oxazoline is a bis-oxazoline and X' is a divalent saturated or unsaturated aliphatic hydrocarbon group of 0 to 32 carbon atoms and R.sup.4 is hydrogen.
- 6. The process of claim 1 wherein said oxazoline is a tris-oxazoline and X' is trivalent and R.sup.4 is the group ##EQU14## wherein Y is a saturated or unsaturated hydrocarbon of 16 carbon atoms.
- 7. The process of claim 1 wherein R' and R.sup.2 are methyl or ethyl.
- 8. The process of claim 1 wherein R' and R.sup.2 are hydroxymethyl.
- 9. The process of claim 1 wherein R' and R.sup.2 are acyloxymethyl.
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.
US Referenced Citations (6)
Divisions (1)
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Number |
Date |
Country |
Parent |
378366 |
Jul 1973 |
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