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US 4,426,467 AGranted
Foundry molding compositions and process
AssigneeBorden (UK) Limited
InventorsIngmar P. Quist, Jeffrey D. Railton, Peter H. R. B. Lemon
Life of this patent
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Abstract
A foundry molding composition comprising, (a) a granular refractory material; (b) about 0.8 to 5.0% of an alkaline phenolic resin based on the weight of the refractory material; (c) about 25 to 110% of a lactone based on the weight of the phenolic resin.
Claims16
A foundry moulding composition comprising:
- (a) a granular refractory material;
- (b) about 0.8 to 5.0% of an alkaline phenolic resin based on the weight of the refractory material;
- (c) about 25 to 110% of a lactone based on the weight of the penolic resin, said composition is capable of setting at ambient temperatures.
A process for the production of foundry moulds and cores which comprises mixing:
- (a) refractory granules with;
- (b) about 0.8 to 5.0% of an alkaline phenolic binder based on the weight of the refractory material;
- (c) about 25 to 110% of a lactone based on the weight of the said binder;
- and
- (d) rapidly discharging the mixture so formed into a corebox or pattern mold, said mixture is capable of setting at ambient temperatures.
2 more elements
A process for the production of foundry molds and cores which comprises the following steps:
- mixing together particles of a sand that has an alkaline reaction and gamma-butyrolactone, then
- mixing therewith an alkali-catalyzed phenol-formaldehyde resin binder in an amount from about 1% to about 2% of the binder by weight based on the sand,
- the amount of said lactone being in the range from about 40% to about 60% by weight based on the said phenolic binder, then
- mixing therewith a small amount of a concentrated aqueous solution of an alkali metal hydroxide, before discharging the mixture, and then
- rapidly thereafter discharging the mixture so formed into a corebox or pattern mold.
2 more elements
Dependencies are inferred from the claim text.