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

Claim 1

A METHOD OF IMPARTING FLAME-RESISTANCE TO A CELLULOSIC TEXTILE MATERIAL OF THE CLASS CONSISTING A NATURAL CELLULOSES, REGENERATED CELLULOSES AND MIXTURES THEREOF, WHICH COMPRISES IMPREGNATING SAID MATERIAL WITH AN ASSOCIATION INGREDIAQUEOUS LIQUID COMPOSITION CONTAINING INGREDIENTS COMPRISING (1) A FINELY DIVIDED OXIDE OF A METAL OF THE GROUP CONSISTING OF ANTIMONY, BISMUTH, TIN AND TITANIUM AND (2) A THERMOPLASTIC SUBSTANCE CONTAINING AT LEAST 20% BY WEIGHT OF COMBINED HALOGEN AND CAPABLE OF RUPTURING UNDER HEAT AT CARBON-HALOGEN BONDS, THE INGREDIENTS OF (1) AND (2) WHICH TOGETHER ARE DESIGNATED HEREINAFTER AS (A) BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.6-20 PARTS OF THE LATTER, AND OF AN AQUEOUS LIQUID COMPOSITION CONTAINING AN INGREDIENT COMPRISING (B) A WATER-SOLUBLE, METAL-FREE, NITROGENCONTAINING SALT OF AN AMINO PHOSPHORIC ACID HAVING AN AMINO NITROGEN ATOM ATTACHED DIRECTLY TO A PHOSPHORUS ATOM, WHICH SALT HAS A MELTING POINT OF LESS THAN 200* C., THE INGREDIENTS OF (A) AND O(B) BEING EMPOLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.2-8 PARTS OF THE LATTER, THE AQUEOUS COMPOSITION CONTAINING THE INGREDIENT (B) HAVING A PH OF FROM ABOUT 3 TO ABOUT 7; HEATING THE IMPREGNATED MATERIAL TO REMOVE ANY RETURE WITHIN THE RANGE OF ABOUT 135*-200* C.; AND WASHING THE RESULTING MATERIAL TO REMOVE ANY RESIDUAL WATER-SOLUBLE SUBSTANCES THEREFROM, THE TOTAL AMOUNT OF THE INGREDIENTS OF (A) AND (B) WITH WHICH THE CELLULOSIC TEXTILE MATERIAL INITIALLY IS IMPREGNATED 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 WASH-FAST IMPREGNANT.

Claim 2

A METHOD OF IMPARTING FLAME-RESISTANCE TO A CELLULOSIC TEXTILE MATERIAL OF THE CLASS CONSISTING A NATURAL CELLULOSES, REGENERATED CELLULOSES AND MIXTURES THEREOF, WHICH COMPRISES IMPREGNATING SAID MATERIAL WITH AN ASSOCIATION INGREDIAQUEOUS LIQUID COMPOSITION CONTAINING INGREDIENTS COMPRISING (1) A FINELY DIVIDED OXIDE OF A METAL OF THE GROUP CONSISTING OF ANTIMONY, BISMUTH, TIN AND TITANIUM AND (2) A THERMOPLASTIC SUBSTANCE CONTAINING AT LEAST 20% BY WEIGHT OF COMBINED HALOGEN AND CAPABLE OF RUPTURING UNDER HEAT AT CARBON-HALOGEN BONDS, THE INGREDIENTS OF (1) AND (2) WHICH TOGETHER ARE DESIGNATED HEREINAFTER AS (A) BEING EMPLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.6-20 PARTS OF THE LATTER, AND OF AN AQUEOUS LIQUID COMPOSITION CONTAINING AN INGREDIENT COMPRISING (B) A WATER-SOLUBLE, METAL-FREE, NITROGENCONTAINING SALT OF AN AMINO PHOSPHORIC ACID HAVING AN AMINO NITROGEN ATOM ATTACHED DIRECTLY TO A PHOSPHORUS ATOM, WHICH SALT HAS A MELTING POINT OF LESS THAN 200* C., THE INGREDIENTS OF (A) AND O(B) BEING EMPOLOYED IN A WEIGHT RATIO OF 1 PART OF THE FORMER TO FROM 0.2-8 PARTS OF THE LATTER, THE AQUEOUS COMPOSITION CONTAINING THE INGREDIENT (B) HAVING A PH OF FROM ABOUT 3 TO ABOUT 7; HEATING THE IMPREGNATED MATERIAL TO REMOVE ANY RETURE WITHIN THE RANGE OF ABOUT 135*-200* C.; AND WASHING THE RESULTING MATERIAL TO REMOVE ANY RESIDUAL WATER-SOLUBLE SUBSTANCES THEREFROM, THE TOTAL AMOUNT OF THE INGREDIENTS OF (A) AND (B) WITH WHICH THE CELLULOSIC TEXTILE MATERIAL INITIALLY IS IMPREGNATED 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 WASH-FAST IMPREGNANT.