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US 5,962,567 AGranted
Bound multi-component sand additive
AssigneeBorden Chemical, Inc.
InventorsMichael M. Geoffrey, Robert A. Laitar
Life of this patent
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AssigneeBorden Chemical, Inc.
InventorsMichael M. Geoffrey, Robert A. Laitar
Estimating the term…
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.
A sand mix comprising a foundry sand and a free-flowing foundry sand additive particle, said particle consisting essentially of at least two bound discrete, solid particulates of a material useable as a foundry sand additive, each of said foundry sand additive materials being selected so as to alter the properties of a foundry sand to which it is added, and each of said free-flowing particles consisting of foundry sand additive particulates, wherein at least one of said foundry sand additive particulates differs in at least one of its physical or chemical properties from the other foundry sand additive particulate in the free-flowing particle, wherein each of said at least two foundry sand additive particulates are adhered to each other by a binder which is hardened or cured to form said free-flowing particle before mixing with foundry sand.
A sand mix comprising a foundry sand and a free-flowing foundry sand additive particle, said particle consisting essentially of at least two bound particulates of foundry sand additives, at least one foundry sand additive selected from the group consisting of carbon, graphite, glass cullet, fused silica, black iron oxide, red iron oxide, clays, minerals, alumina, plant flours and titanium dioxide, wherein each of said foundry sand additives on said free-flowing particle are adhered to each other by a binder which is hardened or cured to form said free-flowing particle before mixing with foundry sand.
Dependencies are inferred from the claim text.