Resin binder for foundry sand cores and molds

Resin binder for foundry sand cores and molds - Sumitomo

6 rows · In the process for preparation of a composition useful as a foundry core or mold consisting

Resin binder for foundry sand cores and molds Patexia

BACKGROUND OF THE INVENTION. This invention is directed to resin-coated sand compositions and to a process for the preparation thereof, and more particularly, to an improved resin binder for producing resin-coated sand compositions substantially free of nitrogen by the dry hot coating method. The improved binder compositions provide improved foundry sand cores and molds. Resin binder for foundry sand cores and molds PatexiaIn a solid phenolic resin composition for binding sand in a foundry sand core or mold prepared by mixing solid novolac and solid resole resin particles, wherein said resole is produced by the reaction comprising condensation of a phenol and a formaldehyde source in the presence of an alkaline catalyst followed by dehydration of the reaction mixture, the improvement comprising adding a lubricant to the

US4848442A - Resin binders for foundry sand cores and

The resin has predominantly ortho-ortho benzylic ether bridges joining the phenolic nuclei in the resin and at least one alkoxymethylene group for every 20 phenolic nuclei. US4848442A - Resin binders for foundry sand cores and molds - Google Patents