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

1985-07-31

1987-05-26

Schofer, Joseph L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528129, 528140, 528165, C08G 804

Patent

active

046687599

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 et al.
patent: 4336179 (1982-06-01), Iyer
patent: 4427800 (1984-01-01), Nakamura
patent: 4454239 (1984-06-01), Cassens

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