Foundry moulds and cores

Details Foundry moulds and cores Foundry moulds and cores

B - Operations, Transporting

22

C

22/164, 400/7314

B22C 1/22 (2006.01) C08G 8/10 (2006.01) C08G 8/28 (2006.01) C08L 61/14 (2006.01)

Patent

CA 1219985

Title of the Invention Foundry Moulds and Cores ABSTRACT A foundry moulding composition comprising (a) a granular refractory material, (b) from 0.25 to 2.5% based on the weight of the refractory material of an aqueous solution of a potassium alkali phenol-formaldehyde resin, said aqueous solution having a solids content of from 50 to 75% and said resin having a weight average molecular weight (?w) of from 700 to 2000, a formaldehyde:phenol molar ratio of from ?:1 to 2.6:1 and a potassium hydroxide:phenol molar ratio of from 0.5:1 to 1.2:1; (c) from 0. 05 to 3% based on the weight of said aqueous solution, of at least one silane, and (d) from 20 to 110% based on the weight of said aqueous solution of at least one ester active to catalyze curing of said resin.

413994

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