Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1989-01-11
1990-12-25
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523146, 524352, 524596, 524475, 524485, C08K 501, C08K 320, C08L 6110
Patent
active
049803948
ABSTRACT:
The invention relates to foundry moulding compositions useful for producing moulds for the manufacture of metal castings wherein the moulds are capable of giving castings with good surface finish without the need for conventional separate blacking applications. A foundry moulding composition of the invention comprises refractory material such as sand, alkali phenol-formaldehyde resole resin solution, carbonifiable material such as styrenated phenol, and an effective amount of an organic ester for hardening the composition. In another embodiment, the invention is a binder composition comprising alkali phenol-formaldehyde resole resin solution and carbonifiable material capable of being hardened by reaction with organic ester. In another embodiment, the invention is a curing additive for a foundry binder comprising carbonifiable material and liquid ester such as gamma-butyrolactone, and the like. In another embodiment, the invention is a method of making a foundry mould wherein a mixture of sand, resin and carbonifiable material is shaped, and then hardened with a gaseous ester such as methyl formate.
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I. Bindernagel et al., Giesserei, vol. 51, pp. 729-730 (1964).
Stanbridge et al., The Replacement of Seacoal in Iron Foundry Molding Sands; (AFS Trans.), 82, 169-180 (1974).
Owen et al., Coaldust Replacement as a Greensand Additive, (British Foundryman), 29-32 (Feb. 1975).
Beale, Sand Additives--Coal-Dust Replacement, (Foundry Trade Journal), 137, (3016), 409-412, 414, 416 (1974).
Baker Derek W.
Ireland John
Lemon Peter H. R. B.
Railton Jeffrey D.
Borden (UK) Limited
Jacobs Lewis T.
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