USE OF A CEMENTITIOUS COMPOSITION AS A COATING FOR DISPOSABLE FOUNDRY CORES AND RELATIVE COATED CORE
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United States of America Patent
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Issued Date -
Aug 29, 2019
app pub date -
Jun 8, 2017
filing date -
Jun 9, 2016
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Abstract
The use of a cementitious composition is described, as a coating for disposable foundry cores, said cementitious composition comprising at least one binder or hydraulic cement in a quantity ranging from 40% to 99.9% by weight with respect to the total weight of the cementitious composition; possibly one or more fillers in a quantity ranging from 0.1% to 60% by weight, with respect to the total weight of the cementitious composition, said filler preferably having a D99<100 μm; at least one rheology modifying agent selected from cellulose, derivatives of cellulose such as methylhydroxyethylcellulose, vinyl acetate/versatate copolymers, polycarboxylate ether polymer, or a mixture thereof, in a quantity ranging from 0.1% to 5% by weight with respect to the total weight of the cementitious composition. A disposable foundry core is also described, having at least one coating layer based on said cementitious composition.
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