TEXTILE ADHESIVE FROM POLYURETHANE
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Abstract
POLYURETHANE TEXTILE ADHESIVE COMPOSITIONS WHICH FURNISH FILMS OF SUPERIOR WET STRENGTH ARE OBTAINED BY FORMING AN ISOCYANATE PREPOLYMER BY REACTING POLYPROPYLENE GLYCOL, 2,2-BIS(HYDROXYMETHYL)PROPIONIC ACID AND TOLYLENE DIISOCYANATE WHEREIN THE DIISOCYANATE TO TOTAL GLYCOL MOLAR RATIO IS BETWEEN 1.6:1 AND 1.8:1 AND THE REACTION IS TERMINATED BEFORE COMPLETION OF THE REACTION, I.E., THE REACTION IS TERMINATED WHEN THE UNREACTED MIXTURE IS REDUCED ("FREE NCO") CONTENT OF THE REACTION MIXTURE IS REDUCED TO FROM 6.19 TO 7.4%.
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