Method of treating fibrous cellulosic materials to impart flame resistance thereto, compositions therefor, and products thereof

Claim 1

THE METHOD OF IMPARTING FLAME RESISTANCE TO A CELLULOSIC TEXTILE MATERIAL OF THE CLASS CONSISTING OF NATURAL CELLULOSES, REGENERATED CELLULOSES AND MIXTURES THEREOF, SAID METHOD COMPRISING IMPREGNATING SAID MATERIAL WITH AN ASSOCIATION OF (1) AN AQUEOUS LIQUID COMPOSITION HAVING A PH OF FROM ABOUT 3 TO ABOUT 7 AND CONTAINING (A) INGREDIENTS INITIALLY IN THE FORM OF A WATERSOLUBLE SALT OF AN OXYGEN-CONTAINING ACID OF PHOSPHORUS WHEREIN THE PHOSPHORUS ATOM HAS A VALENCE OF 5 AND A WATER-SOLUBLE NITROGENOUS SUBSTANCE OF THE GROUP CONSISTING OF CYANAMIDE, DICYANDIAMIDE AND MIXTURES THEREOF, SAID SALT OF AN OXYGEN-CONTAINING ACID OF PHOSPHORUS AND SAID NITROGENOUS SUBSTANCE BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER CALCULATED AS H3PO4 TO FROM 0.2 TO 5.5 PARTS OF THE LATTER, AND (2) AN AQUEOUS LIQUID COMPOSITION CONTAINING (B) INGREDIENTS COMPRISING A FINELY DIVIDED OXIDE OF ANTIMONY AND A THERMOPLASTIC HALOGENCONTAINING, ORGANIC SUBSTANCE HAVING AT LEAST 20% BY WEIGHT OF COMBINED HALOGEN AND CAPABLE OF RUPTURING UNDER HEAT AT CARBON-HALOGEN BONDS, SAID FINELY DIVIDED OXIDE OF ANTIMONY AND SAID THERMOPLASTIC SUBSTANCE BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.6 TO 20 PARTS OF THE LATTER, AND THE SAID INGREDIENTS OF (A) AND (B) BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE LATTER TO FORM 0.2 TO 8 PARTS OF THE FORMER; HEATING THE TEXTILE MATERIAL AFTER IT HAS BEEN IMPREGNATED WITH A COMPOSITION COMPRISING THE AQUEOUS LIQUID COMPOSITION OF (1) AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 135*C. TO ABOUT 200*C.; AND WASHING THE RESULTING MATERIAL TO REMOVE ANY RESIDUAL WATER-SOLUBLE SUBSTANCES THEREFROM, THE TOTAL AMOUNT OF THE COMPOSITIONS OF (1) AND (2) WITH WHICH THE CELLULOSIC MATERIAL INITIALLY IS IMPREGNANTED BEING SUCH THAT THE FINISHED FLAME-RESISTANT TEXTILE CONTAINS FROM ABOUT 10% TO ABOUT 75% BY WEIGHT, BASED ON THE DRY WEIGHT OF THE UNTREATED TEXTILE, OF WASHFAST IMPREGNANT.

Claim 2

THE METHOD OF IMPARTING FLAME RESISTANCE TO A CELLULOSIC TEXTILE MATERIAL OF THE CLASS CONSISTING OF NATURAL CELLULOSES, REGENERATED CELLULOSES AND MIXTURES THEREOF, SAID METHOD COMPRISING IMPREGNATING SAID MATERIAL WITH AN ASSOCIATION OF (1) AN AQUEOUS LIQUID COMPOSITION HAVING A PH OF FROM ABOUT 3 TO ABOUT 7 AND CONTAINING (A) INGREDIENTS INITIALLY IN THE FORM OF A WATERSOLUBLE SALT OF AN OXYGEN-CONTAINING ACID OF PHOSPHORUS WHEREIN THE PHOSPHORUS ATOM HAS A VALENCE OF 5 AND A WATER-SOLUBLE NITROGENOUS SUBSTANCE OF THE GROUP CONSISTING OF CYANAMIDE, DICYANDIAMIDE AND MIXTURES THEREOF, SAID SALT OF AN OXYGEN-CONTAINING ACID OF PHOSPHORUS AND SAID NITROGENOUS SUBSTANCE BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER CALCULATED AS H3PO4 TO FROM 0.2 TO 5.5 PARTS OF THE LATTER, AND (2) AN AQUEOUS LIQUID COMPOSITION CONTAINING (B) INGREDIENTS COMPRISING A FINELY DIVIDED OXIDE OF ANTIMONY AND A THERMOPLASTIC HALOGENCONTAINING, ORGANIC SUBSTANCE HAVING AT LEAST 20% BY WEIGHT OF COMBINED HALOGEN AND CAPABLE OF RUPTURING UNDER HEAT AT CARBON-HALOGEN BONDS, SAID FINELY DIVIDED OXIDE OF ANTIMONY AND SAID THERMOPLASTIC SUBSTANCE BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.6 TO 20 PARTS OF THE LATTER, AND THE SAID INGREDIENTS OF (A) AND (B) BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE LATTER TO FORM 0.2 TO 8 PARTS OF THE FORMER; HEATING THE TEXTILE MATERIAL AFTER IT HAS BEEN IMPREGNATED WITH A COMPOSITION COMPRISING THE AQUEOUS LIQUID COMPOSITION OF (1) AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 135*C. TO ABOUT 200*C.; AND WASHING THE RESULTING MATERIAL TO REMOVE ANY RESIDUAL WATER-SOLUBLE SUBSTANCES THEREFROM, THE TOTAL AMOUNT OF THE COMPOSITIONS OF (1) AND (2) WITH WHICH THE CELLULOSIC MATERIAL INITIALLY IS IMPREGNANTED BEING SUCH THAT THE FINISHED FLAME-RESISTANT TEXTILE CONTAINS FROM ABOUT 10% TO ABOUT 75% BY WEIGHT, BASED ON THE DRY WEIGHT OF THE UNTREATED TEXTILE, OF WASHFAST IMPREGNANT.