Abstract: Quick curing "no bake" foundry core and mold compositions containing metal salt accelerators to provide shaped sand shapes which can be removed from a mold in a period of not more than about 40 seconds.

Abstract: A binder composition for foundry molds and cores comprising a furan based binder, a metal sulfonate curing catalyst therefor and a cure promoter selected from copper chloride, zinc chloride and iron chloride.

Abstract: A catalyst material is described, particularly useful in making core sand from which resin bound sand shapes are made. The preferred catalyst is a material comprising at least one salt made from a weak base and an acid from the group comprising lower aliphatic and aromatic hydrocarbon sulfonic acids. The curable resin binder is preferably a furfuryl alcohol polymer or other furan-based material. The resin is preferably present in an amount of about 0.5% to about 5% based on the weight of sand, while the catalyst is present in an amount of about 5% to 40% by weight of the resin material. The catalyzed composition provides an excellent combination of working or bench life, rapid curing on a delayed action basis and favorable shape-imparting and holding properties in the formed sand shapes. Specifically preferred compositions include aluminum and copper phenol and toluene sulfonic acid salts.

Abstract: A catalyst material particularly useful in making core sand from which resin bound sand shapes are made. The preferred catalyst is a material comprising at least one salt made from a weak base and an acid from the group comprising lower aliphatic and aromatic sulfonic acids. The curable resin binder is preferably a furfuryl alcohol polymer or other furan-based material. The resin is preferably present in an amount of about 0.5% to about 5% based on the weight of sand, while the catalyst is present in an amount of about 5% to 40% by weight of the resin material. The catalyzed composition provides an excellent combination of working or bench life, rapid curing on a delayed action basis and favorable shape-imparting and holding properties in the formed sand shapes. Specifically preferred compositions include aluminum and copper phenol and toluene sulfonic acid salts.

Abstract: Foundry sand mixes comprising a mixture of sand, binder, and hydrogen peroxide are improved with respect to bench life by the addition thereto, at the time of initial preparation of the mixture, of non-catalyzing amounts, but stabilizing amounts, of certain iron chelating agents which are acid or salts of acids selected from those which, in their free acid form, have an acidic pH less than 3.0 when dissolved at 1 percent weight per weight in water or when saturated in water, whichever is lower in concentration.