Borden Chemical, Inc.

Acme Resin Corporation

Michael M Geoffrey

Robert A Laitar

Compositions and methods for improving the characteristics of foundry cores which includes adding to a foundry aggregate mixture polyurethane resin binder comprising epoxy resin and, preferably, paraffinic oil.

Foundry binder of polyurethane, phenolic resin, polyisocyanate and epoxy

Two or more sand additive particles are made to adhere to each other, using a binder. The finished product consists of free-flowing particles that are composed of the additive particles bound together by the binder. These bound additive particles may then be applied to sand, such as foundry sands, where, otherwise, multiple additions of additive might need to be made. The pH of the single additive particles can be controlled and separation of the additives due to different specific gravities can be avoided. Various mixtures of different additives are disclosed. Methods of controlling particle size of additive particles, tendency to generate dust, degrade tensile strength or control thermal expansion of foundry cores or molds by using bound additive particles are also disclosed.

Bound multi-component sand additive

Compositions and methods for improving the characteristics of foundry cores which includes adding to the foundry aggregate mixture one or more biphenyl compounds.

Biphenyl additive for improvement in urethane foundry binders

Foundry binder of phenolic resole resin, polyisocyanate and epoxy resin

A resin is prepared by the reaction of a phenol, an aldehyde and an aliphatic hydroxy compound containing two or more hydroxy groups per molecule in the presence of a divalent metal ion catalyst. These resins react with polyisocyanates to form polyurethanes that are useful binders for foundry cores and molds.

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Lombard, IL, United States of America

Michael M Geoffrey