Process of preventing discoloration of nylon textiles with urea, biuret, dicyandiamide or ammonium cyanate and a crease proofing resin and products produced therefrom

Claim 1

A PROCESS FOR TREATING A TEXTILE MATERIAL OF A WATERINSOLUBLE LONG-CHAIN SYNTHETIC POLYMERIC AMIDE HAVING RECURRING CARBONAMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN TO REDUCE DISCOLORATION THEREOF ON AGEING AND HEATING COMPRISING IMPREGNATING SAID POLYAMIDE WITH AN AQUEOUS SOLUTION CONTAINING SAID POLYBY WEIGHT OF A SOLUTE CONSISTING EXCLYSIVELY OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF UREA, BIURET, DICYANDIAMIDE, AND AMMONIUM CYCANATE, DRYING THE IMPREGNATED TEXTILE TO LEAVE THEREON A DEPOSIT OF AT LEAST ABOUT 5%, BASED ON THE WEIGHT OF SAID POLYAMIDE, OF SAID SOLUTE, AND THEN HEATING SAID POLYAMIDE CARRYING SAID DEPOSIT AT A TEMPERATURE BETWEEN 240*F. AND ABOUT 450* F. FOR A PERIOD OF TIME BETWEEN ABOUT TWO SECOND AND FOUR HOURS, THE TIME AND TEMPERATURE BEING GENERALLY INVERSELY RELATED, AND SUBSEQUENTLY APPLYING TO THE TEXTILE MATERIAL A HEAT-CONVERTIBLE RESIN-FORMING AMINOPLAST CONDENSATE SELECTED FROM THE GROUP CONSISTING OF UREA-FORMALDEHYDE CONDENSATES HAVING A FORMALDEHYDE TO UREA MOLAR RATIO OF AT LEAST 2:1, MELAMINE-FORMALDEHYDE CONDENSATES, AND THIOUREA-FORMALDEHYDE CONDENSATES, AS WELL AS THE ALKYLATION PRODUCTS OBTAINED FROM SAID CONDENSATES OBTAINED FROM ALCOHOLS HAVING FROM 1 TO 4 CARBON ATOMS, AND BANKING THE TEXTILE CARRYING SUCH CONDENSATE AT A TEMPERATURE OF 240*F. TO 450*F. TO CURE THE CONDENSATE.