Alkaline benzylic ether phenolic resin binders

Details Alkaline benzylic ether phenolic resin binders Alkaline benzylic ether phenolic resin binders

1992-03-02

1993-04-20

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

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

RE0342289

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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