Alkaline benzylic ether phenolic resin binders

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528139, 528140, 524594, 524595, 524596, 524611, 523143, 523145, 523146, 523147, 264 82, 164 12, 164 16, C08G 804, C08L 6100, B22C 122, B22C 900

Patent

active

050215396

ABSTRACT:
Modified benzylic ether resole resins and process for their preparation. The resins are prepared by treating a phenol with a molar excess of aldehyde in the presence of a divalent metal ion catalyst at a pH below 7 followed by further reaction at a pH above 8 in the presence of an alkaline catalyst. Alkaline solutions of the resins are used as foundry binders in an ester cure process.

REFERENCES:
patent: Re32720 (1988-07-01), Lemon et al.
patent: 3485797 (1969-12-01), Robins
patent: 4140845 (1979-02-01), Vasishth
patent: 4268425 (1981-05-01), Gardikes
patent: 4549187 (1985-10-01), Levy
patent: 4668359 (1984-08-01), Lemon et al.
patent: 4668759 (1987-05-01), Iyer et al.
patent: 4780489 (1988-10-01), Dunnavant et al.

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