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US 4,233,076 AGranted
Novel sand/silicate compositions for foundry molds/cores
AssigneeRhone-Poulenc Industries
InventorsJean-Pierre Blanc, Francois Meiller
Life of this patent
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Abstract
Foundry mold and core compositions comprising sand, a silicate binder and a hardening agent include an alumina "demolding" agent having an average grain size distribution of less than 40.mu., preferably between 0.2 and 5.mu..
Claims20
In a moldable composition of matter comprising an intimate uniform admixture of sand, an alkali metal silicate, and at least one of a hardening agent;
- selected from the group consisting of an alkylene carbonate, an organic monocarboxylic or dicarboxylic acid or methyl ester thereof, carbon dioxide and blast furnace slag;
- the improvement comprising a demolding agent which comprises an alumina having an average grain size distribution of between 0.2 and 5.mu..
Dependencies are inferred from the claim text.