Monomethylol dimethyl hydantoin and dimethylol urea to shrinkproof and creaseproof cellulose fabrics

Claim 1

A PROCESS OF IMPARTING IMPROVED CREASERESISTANCE AGAINST WASHING AND BOIL-FAST SHRINKAGE CONTROL OF A CELLULOSIC TEXTILE FABRIC SELECTED FROM THE GROUP CONSISTING OF NATURAL CELLULOSE, REGENERATED CELLULOSE AND THEIR MIXTURES WITH UP TO 50% OF CELLULOSE ACETATE, THE STEPS OF IMPREGNATING SAID FABRIC WITH AN AQUEOUS SOLUTION OF MONOMETHYLOL DIMETHYL HYDANTOIN, SAID ALDEHYDE DONOR BEING PRESENT IN A CONCENTRATION RANGING FROM 1 TO 7% BY WEIGHT OF THE AQUEOUS SOLUTION WHICH, UPON BAKING, DECOMPOSES TO FORM FROM 0.2 TO 1.5% OF AVAILABLE ACTIVE FORMALDEHYDE AND FROM ABOUT 3 TO 10% BY WEIGHT OF THE FABRIC OF DIMETHYLOL UREA COMPRISING 1 MOL OF UREA AND 2 MOLS OF FORMALDEHYDE, AND A WATER-SOLUBLE NONVOLATILE ACID IN A CONCENTRATION SUCH AS TO GIVE TO THE SOLUTION A PH OF FROM ABOUT 1 TO ABOUT 2.5, REMOVING THE SURPLUS LIQUID FROM THE MATERIAL, DRYING THE MATERIAL AT A TEMPERATURE OF FROM 180* TO 240* F., BAKING THE DRIED FABRIC AT A TEMPERATURE OF FROM 212* TO 310* F. FOR A TIME SUFFICIENT TO EFFECT REACTION BETWEEN LIBERATED FORMALDEHYDE AND THE TEXTILE FABRIC, AND NEUTRALIZING AND WASHING THE FABRIC TO REMOVE ACID AND REACTION BYPRODUCTS THEREBY TO PROVIDE A FABRIC WHICH IS CREASE-RESISTANT AND SHRINKAGE-CONTROLLED AND WHICH HAS SUBSTANTIALLY RETAINED ITS ORIGINAL TENSILE STRENGTH AND COLOR.