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

C - Chemistry, Metallurgy

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C08G 8/10 (2006.01) B22C 1/22 (2006.01) C04B 35/01 (2006.01) C08G 8/04 (2006.01) C08L 61/10 (2006.01)

Patent

CA 1247299

3350 PHENOLIC RESIN BINDERS FOR FOUNDRY AND REFRACTORY USES ABSTRACT OF THE DISCLOSURE 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. -28-

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