NEW BINDERS CONTAINING PHENOLIC RESINS AND SOLVENTS OF THE ORGANIC PHOSPHATE OR CARBONATE TYPE OR OF THE MIXED TYPE AND THEIR APPLICATION TO THE PRODUCTION OF FOUNDRY CORES AND MOLDS

摘要

The invention relates to the field of foundry. /P P It relates to a new binder comprising A a component of the phelonic resin type containing at least one resin in the state of resol or novolak, a solvent consisting of a mixture of 1 of a hydrocarbon and 2 of a polar organic compound containing an amount at least sufficient of an organic ester of phosphoric and / or carbonic acid to increase the rate of maturation and improve the solubility of the phenolic resin, B an icocyanate with a functionality equal to or greater than 2 and C a quantity of catalyst sufficient to catalyze practically all the reaction between components A and B. /P P Application to the production of molds and cores in sand by the "cold box" or "process" without cooking .