Abstract 1. A PROCESS FOR IMPARTING FLAME RETARDANT CHARACTER TO CELLULOSE CONTAINING MATERIAL WHICH COMPRISES (1) IMPREGNATING A CELLULOSE-CONTAINING MATERIAL WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 9 AND CONTAINING FROM BOUT 10 TO ABOUT 40 PERCENT BY WEIGHT OF TETRAKIS (HYDROXYMETHYL) PHOSPHONIUM HYDROXIDE COMPOUND; (2) DRYING THE THUS IMPREGNATED MATERIAL TO ABOUT 0 TO ABOUT 8 PERCENT MOISTURE RETENTION, AND (3) EXPOSING SAID DRIED MATERIAL TO AN ATMOSPHERE CONTAINING AT LEAST ABOUT 50 PERCENT BY VOLUME OF GASEOUS AMMONIA IN AN ENCLOSED CHAMBER FOR A PRRIOD OF FROM ABOUT TO LESS THAN ABOUT 45 SECONDS TO POLYMERIZED THE PHOSPHOIUM HYDROXIDE COMPOUND IN AND ON THE CELLULOSE CONTAINING MATERIAL.
A PROCESS FOR IMPARTING FLAME RETARDANT CHARACTER TO CELLULOSE CONTAINING MATERIAL WHICH COMPRISES (1) IMPREGNATING A CELLULOSE-CONTAINING MATERIAL WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 9 AND CONTAINING FROM BOUT 10 TO ABOUT 40 PERCENT BY WEIGHT OF TETRAKIS (HYDROXYMETHYL) PHOSPHONIUM HYDROXIDE COMPOUND; (2) DRYING THE THUS IMPREGNATED MATERIAL TO ABOUT 0 TO ABOUT 8 PERCENT MOISTURE RETENTION, AND (3) EXPOSING SAID DRIED MATERIAL TO AN ATMOSPHERE CONTAINING AT LEAST ABOUT 50 PERCENT BY VOLUME OF GASEOUS AMMONIA IN AN ENCLOSED CHAMBER FOR A PRRIOD OF FROM ABOUT TO LESS THAN ABOUT 45 SECONDS TO POLYMERIZED THE PHOSPHOIUM HYDROXIDE COMPOUND IN AND ON THE CELLULOSE CONTAINING MATERIAL.
Claim 2
Dependent Claim
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A PROCESS FOR IMPARTING FLAME RETARDANT CHARACTER TO CELLULOSE CONTAINING MATERIAL WHICH COMPRISES (1) IMPREGNATING A CELLULOSE-CONTAINING MATERIAL WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 9 AND CONTAINING FROM BOUT 10 TO ABOUT 40 PERCENT BY WEIGHT OF TETRAKIS (HYDROXYMETHYL) PHOSPHONIUM HYDROXIDE COMPOUND; (2) DRYING THE THUS IMPREGNATED MATERIAL TO ABOUT 0 TO ABOUT 8 PERCENT MOISTURE RETENTION, AND (3) EXPOSING SAID DRIED MATERIAL TO AN ATMOSPHERE CONTAINING AT LEAST ABOUT 50 PERCENT BY VOLUME OF GASEOUS AMMONIA IN AN ENCLOSED CHAMBER FOR A PRRIOD OF FROM ABOUT TO LESS THAN ABOUT 45 SECONDS TO POLYMERIZED THE PHOSPHOIUM HYDROXIDE COMPOUND IN AND ON THE CELLULOSE CONTAINING MATERIAL.