C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 61/06 (2006.01) B22C 1/22 (2006.01) C08G 8/10 (2006.01) C08G 8/28 (2006.01)
Patent
CA 2061372
A binder composition for producing articles of bonded particulate material such as foundry moulds or core comprises an alkaline aqueous solution of a resol phenol-aldehyde resin, an oxyanion which can form a stable complex with the resin, and an ethylene glycol monoalkyl ether. The binder composition has an alkali to phenol molar ratio of from 1.5:1 to 2.5:1 and the amount of alkali present in the solution is sufficient to substantially prevent stable complex formation between the resin and the oxyanion. Bonded articles are produced by passing carbon dioxide gas through articles formed from a mixture of particulate material and the binder composition so as to produce stable complex formation and curing of the resin.
Bradley Martin
Smith Garry
Foseco International Limited
Gowling Lafleur Henderson Llp
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