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US 4,363,665 AGranted
Novel sand/silicate compositions for foundry molds/cores
AssigneeRhone-Poulenc Industries
InventorsGerard Barrier, Jean-Pierre Blanc
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Abstract
Foundry mold and core compositions containing sand, an alkali metal silicate and a hardening agent therefor include, and are characterized by, a demolding agent comprising a finely divided inorganic metal compound, together with from 1 to 99% by weight thereof, of a hydrated alumina having an average grain size ranging from 0.2 to 5.mu..
Claims15
In a moldable composition of matter comprising an intimate admixture of sand, an alkali metal silicate, a hardening agent and a demolding agent;
- the improvement which comprises a demolding agent including a mixture of a finely divided alkaline earth metal oxide or carbonate and from 1 to 99% by weight thereof of a hydrated alumina having an average grain size ranging from 0.2 to 5.mu..
Dependencies are inferred from the claim text.