Acrolein-formaldehyde condensation products and process of applying the same to cellulose fabric

Claim 2

A PROCESS OF CROSS-LINKING CELLULOSE WHICH COMPRISES IMPREGNATING SUBSTANTIALLY ALKALI-FREE CELLULOSE WITH AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 5% TO 50% OF A WATER-SOLUBLE REACTIVE CHEMICAL WHICH IS THE CONDENSATION PRODUCT OF ONE MOL OF ACROLEIN AND FROM ABOUT ONE TO SIX MOLS OF FORMALDEHYDE CONDENSED IN THE PRESENCE OF A SMALL PERCENTAGE LESS THAN 5% OF A BASIC CATALYST, SAID SOLUTION ALSO CONTAINING FROM ABOUT 1% TO 5% OF AN ACIDIC CATALYST, AND HEATING THE THUS IMPREGNATED CELLULOSE AT A TIME AND TEMPERATURE SUFFICIENT TO DRY IT AND TO CAUSE REACTION BETWEEN SAID CELLULOSE AND SAID CHEMICAL.