Binder composition for foundry sand containing zinc carbonate di

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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164 43, 260 38, 260 39R, 260 40R, 264337, 521 92, 521122, 521123, 521139, 521182, C12P 1934

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042489741

ABSTRACT:
A binder composition for binding foundry sand particles to form molds and cores in sand mold casting processes which may be aluminum alloy casting processes, comprising a thermosetting resin and powdery zinc carbonate which is dispersed in the resin and, while the molds and cores are heated by the poured molten metal, undergoes thermal decomposition with generation of carbon dioxide gas which aids the molds and cores to become readily disintegratable.

REFERENCES:
patent: 3572417 (1971-03-01), Wismer
patent: 3574646 (1971-04-01), Wismer et al.
patent: 3993117 (1976-11-01), Chenriot et al.
patent: 4111253 (1978-09-01), Epstein et al.

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