Flame retardant process for cellulosics
Abstract
Abstract AN IMPROVED PROCESS FOR IMPARTING FLAM RETARDANCE TO CELLULOSE-CONTAINING MATERIALS HAS BEEN DEVISED WHEREBY MATERIALS WHICH HAVE BEEN IMPREGNATED WITH A SOLUTION HAVING A PH FROM ABOUT 7 TO ABOUT 9 AND A MONOTION HAVING TRIS(HYDROXYMETHYL) PHOSPHINE CONTENT OF ABOUT 10 TO ABOUT 40 PERCENT BY WEIGHT, DRIED TO A MOISTURE CONTENT OF ABOUT 10 TO ABOUT 20 PERCENT AND THE MONOMER POLYMERIZED ON AND IN THE MATERIAL BY TREATMENT WITH AMMONIA, ARE TREATED FIRST WITH GASEOUS AMMONIA FOR ABOUT ONE LESS THAN ABOUT FIVE MINUTES AND THEREAFTER WITH AN AQUEOUS SOLUTION OF AMMONIA FOR AT LEAST TEN BUT NOT MORE THAN SIXTY SECONDS. THE MONOMER IS MORE RAPIDLY POLYMERIZED ON AND IN THE MATERIAL BY THE WITH BINED ACTION OF GASEOUS AND AQUEOUS AMMONIA THAN WITH GASEOUS AMMONIAALONE, WHICH RESULTS IN A MORE EFFECTIVE AND MORE ECONOMICAL PROCESS READILY ADAPTABLE TO HIGH SPEED COMMERCIAL TEXTILE MACHINERY.
Inventors
- 👤 G Wagner
Bibliographic Details
Claims Analysis
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