Alkaline resol phenol-aldehyde resin binder compositions contain

Details Alkaline resol phenol-aldehyde resin binder compositions contain Alkaline resol phenol-aldehyde resin binder compositions contain

1992-02-13

1993-09-07

Foelak, Morton

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523139, 524443, 524594, 524596, 525506, 528138, 528139, 528142, B22C 122

Patent

active

052429571

ABSTRACT:
A binder composition for producing articles of bonded particulate material such as foundry molds or cores comprises an alkaline aqueous solution of a resol phenol-aldehyde resin, an oxyanion which can form a stable complex with the resin, and a phenyl ethylene glycol 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.

REFERENCES:
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patent: 4971132 (1990-11-01), Armbruster
patent: 4977209 (1990-12-01), Barker et al.
patent: 4985489 (1991-01-01), Barker et al.
patent: 5032642 (1991-07-01), Lemon et al.
Rose, Arthur & Elizabeth, The Condensed Chemical Dictionary, 7th Ed., Van Nostrand Reinhold Co., pp. 190 & 394, 1969.

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