Foundry process and molding mixture

Claim 1

A PROCESS FOR CASING WITH A THIN-WALLED FOUNDRY MOLD, SAID PROCESS COMPRISING FORMING A SAND-ORGANIC BINDER MIXTURE OF ABOUT 0.4% TO 5% BY WEIGHT OF POLYMERIZED FURFURLY ALCOHOL HAVING A LOW MONOMER CONTENT, 0.05% TO 1% BY WEIGHT OF CURING AGENT FOR SAID POLYMERIZED FURFURYL ALCOHOL, AT LEAST 0.4% BY WEIGHT OF GREE STRENGTH ADDITIVE,0.5% TO 5% BY WEIGHT OF THERMOSETTING PHENOL ALDEHYDE RESIN, AND THE BALANCE SUBSTANTIALLY ALL SAND, PLACING SAID MIX INTO CONTACT WITH A METAL PATTERN WHICH HAS BEEN HEATED TO A TEMERATURE OF AT LEAST 250* F. TO BOND A SUBSTANTIAL PORTION OF THE SAND PARTICLES TOGETHER, THEREAFTER CURING THE FORMED SHELL MOLD BY HEATING WHILE IN CONTACT WITH SAID PATTERN AT A TEMPERATURE OF 300* TO 1500* F. FOR A SUFFICIENT TIME TO PREVENT THERMAL COMBUSTION OF THE ORGANIC BINDER, AND CASTING MATAL IN SAID CURED SHELL MOLD WHILE THE SAND THEREOF IS BOND BY SAID ORGANIC BINDER.