Impregnating solutions and method of impregnation therewith

Claim 1

IN A METHOD OF TREATING A POROUS MATERIAL WITH LIQUID FURAN RESIN FORMING MATERIALS, THE IMPROVEMENT COMPRISING IMPARTING ALKALI RESISTANCE TO SAID MATERIAL BY IMPREGNATING SAID MATERIAL WITH A SOLUTION, STORAGE-STABLE AT ROOM TEMPERATURES, CONTAINING A RESIN FORMING IMPREGNATOR CONSISTING ESSENTIALLY OF 65-99% BY WEIGHT OF FURFURYL ALCOHOL, 0.5-15% BY WEIGHT WATER, AND 0.5-10% BY WEIGHT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF CADMIUM NITRATE, COBALTOUS NITRATE, NICKEL NITRATE, ZINC NITRATE, ZINC CHLORIDE, AND DIBASIC AND TRIBASIC ORGANIC ACIDS HAVING AN IONIZATION CONSTANT FOR THE FIRST HYDROGEN OF ABOUT 1X10-3, IN SUFFICIENT QUANTITY TO PERMEATE THE PORES OF SAID MATERIAL, WHEREBY A QUANTITY OF SAID SOLUTION IS RETAINED BY SAID MATERIAL, AND HEATING THE IMPREGNATED MATERIAL AT TEMPERATURES OF 60-105*C. TO FORM THEREIN, IN SITU, A CURED FURAN RESIN REPRESENTING AT LEAST 50% BY WEIGHT OF THE FURAN MONOMER IN SAID QUANTITY OF SAID SOLUTION RETAINED BY SAID MATERIAL.