Fibrous 2-phosphatoethyl ethers of cellulose and process of making the same

Claim 2

A PROCESS COMPRISING IMPREGNATING A COTTON FABRIC WITH AN AQUEOUS SOLUTION OF ABOUT 5 TO 15% BY WEIGHT OF A SODIUM SALT OF 2-CHLOROETHYLPHOSPHORIC ACID AND ABOUT 14 TO 20% BY WEIGHT OF SODIUM HYDROXIDE, AND HEATING THE WET FABRIC AT ABOUT 80 TO 110* C. FOR ABOUT 5 TO 40 MINUTES, USING A SHORTER TIME WITH A HIGHER TEMPERATURE TO PRODUCE A MODIFIED COTTON HAVING ABOUT 0.25 TO 2.5% PHOSPHOROUS BY WEIGHT.

Claim 3

CHEMICALLY MODIFIED COTTON TEXTILE FIBERS MODIFIED ONLY IN THAT A SUFFICIENT OF HYDROXYL GROUPS OF THE CELLULOSE CONTAINED THEREIN HAVE BEEN CONVERTED TO -OCH2CH2OPO3M2 GROUPS IN WHICH M IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND NH4, THE DEGREE OF CONVERSION BEING SUCH THAT THE MODIFIED COTTON CONTAINS ABOUT 0.25 TO 2.5% BY WEIGHT PHOSPHORUS CONTAINED IN THE -OCH2CH2OPO3M2 GROUPS, HAS REDUCED COMBUSTIBILITY, AND HAS A CATION EXCHANGE CAPACITY OF 0.15 TO 1.5 MILLIEQUIVALENTS PER GRAM.

Claim 4

CHEMICALLY MODIFIED COTTON TEXTILE FIBERS MODIFIED ONLY IN THAT A SUFFICIENT OF HYDROXYL GROUPS OF THE CELLULOSE CONTAINED THEREIN HAVE BEEN CONVERTED TO -OCH2CH2OPO3M2 GROUPS IN WHICH M IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND NH4, THE DEGREE OF CONVERSION BEING SUCH THAT THE MODIFIED COTTON CONTAINS ABOUT 0.25 TO 2.5% BY WEIGHT PHOSPHORUS CONTAINED IN THE -OCH2CH2OPO3M2 GROUPS, HAS REDUCED COMBUSTIBILITY, AND HAS A CATION EXCHANGE CAPACITY OF 0.15 TO 1.5 MILLIEQUIVALENTS PER GRAM.