Binder compositions
AssigneesFoseco International Limited, Co-operative Verkoap-en Productievereiniging van Aardappelmeel en Derivaten "Avebe" G.A.
InventorsAndries Kraak, Raymond Douglas George
Life of this patent
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Abstract
The breakdown properties of silicate bonded foundry sand moulds and cores can be improved by including with the silicate binder a starch hydrolysate having a dextrose equivalent of less than 5.
Claims12
A binder composition consisting essentially of an aqueous solution of an alkali metal silicate and a stabilized starch hydrolysate having a dextrose equivalent of below 5, the components being present in the weight ratios, calculated as solids, of 0.4 to 35 parts stabilized starch hydrolysate per 20 to 49.5 parts alkali metal silicate.
In the method of making an article of bonded particulate material which comprises forming to the desired shape a mixture comprising particulate material and a binder composition and causing or allowing the mixture to harden, the improvement comprising using as binder composition, a mixture, in aqueous solution, of an alkali metal silicate and a stabilized starch hydrolysate having a dextrose equivalent of below 5, the components being present in the weight ratios, calculated as solids, of 0.4 to 35 parts stabilized starch hydrolysate per 20 to 49.5 parts alkali metal silicate.
Dependencies are inferred from the claim text.