Phenolic resin binders for foundry and refractory uses

Details Phenolic resin binders for foundry and refractory uses Phenolic resin binders for foundry and refractory uses

1987-03-06

1988-04-26

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523146, 524594, B22C 1122

Patent

active

047405350

ABSTRACT:
A process for preparing modified phenolic resole resins providing improved binders for refractories and foundry cores and molds. The resins are prepared by treating a phenol with a molar excess of aldehyde in the presence of an alkaline catalyst followed by further reaction at a pH below 7 in the presence of a catalyst which promotes formation of ortho-ortho benzylic ether bridges between the phenolic nuclei.

REFERENCES:
patent: 2079633 (1937-05-01), Rothrock
patent: 3485797 (1969-12-01), Robins
patent: 4283319 (1981-08-01), Konil
patent: 4336179 (1982-06-01), Iyer
patent: 4427800 (1984-01-01), Nakamura
patent: 4454239 (1984-06-01), Cassens
patent: 4644022 (1987-02-01), Iyer
International Application published under the Patent Cooperation Treaty (PCT-WO 8505580), "Phenolic Resin-Polyisocyanate Binder Systems"; Ashland Oil, Inc., pp. 1-27.

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