Production of articles of bonded particulate material and binder

Details Production of articles of bonded particulate material and binder Production of articles of bonded particulate material and binder

1989-09-29

1991-01-15

Cashion, Jr., Merrell C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524443, 524596, 525506, 528138, 528139, C08L 6106, C08L 828, C08K 338, C08K 556

Patent

active

049854895

ABSTRACT:
A binder composition for producing articles of bonded particulate material such as foundry moulds or cores comprises an alkaline aqueous solution of a resol phenol-aldehyde resin and an oxyanion capable of forming a stable complex with the resin the amount of alkali present in the solution being sufficient to substantially prevent stable complex formation. Bonded articles are produced from mixtures of particulate material and the binder composition by passing carbon dioxide gas through the formed articles whereby the oxyanion forms a stable complex with the resin and the resin is cured. The oxyanion may be for example borate, stannate or aluminate.

REFERENCES:
patent: 2889241 (1959-06-01), Gregory et al.
patent: 4584329 (1986-04-01), Gardziella et al.

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