Method of reacting cellulose paper and specific non-ionic latices containing hydrogen and hydroxy groups in the polymer chain with polyisocyanate adducts

Claim 1

A METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF CELLULOSE PAPER WHICH COMPRISES: IMPREGNATING SAID PAPER WITH A COMPOSITION CONSISTING ESSENTIALLY OF A SUBSTANTIALLY NON-IONIC POLYMERIC VINYL ACETATE LATEX WHEREIN THE CHAIN PORTION OF THE VINYL ACETATE POLYMER CONTAINS HYDROGEN AND HYDROXY GROUPS AS SUBSTITUENTS ON SAID CHAIN, SAID GROUPS BEING CAPABLE OF REACTING WITH ISOCYANATE GROUPS, AND AN AQUEOUS EMULSION OF A POLYISOCYANATE ADDUCT WHICH IS STABLE IN THE PRESENCE OF THE NON-IONIC LATEX AND NON-REACTIVE UNTIL HEATED TOA TEMPERATURE WHICH REGENERATES FREE ISOCYANATE GROUPS IN REACTIVE FORM, SUBSTANTIALLY DRYING THE TREATED PAPER AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH FREE ISOCYANATA GROUPS ARE REGENERATED, AND HEATING THE DRIED PAPER TO A TEMPERATURE ABOVE ABOUT 140*C. FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE FREE ISOCYANATE GROUPS WHICH REACT WITH THE HYDROGEN AND HYDROXY GROUPS IN THE PAPER AND THE POLYMER.

Claim 2

A METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF CELLULOSE PAPER WHICH COMPRISES: IMPREGNATING SAID PAPER WITH A COMPOSITION CONSISTING ESSENTIALLY OF A SUBSTANTIALLY NON-IONIC POLYMERIC VINYL ACETATE LATEX WHEREIN THE CHAIN PORTION OF THE VINYL ACETATE POLYMER CONTAINS HYDROGEN AND HYDROXY GROUPS AS SUBSTITUENTS ON SAID CHAIN, SAID GROUPS BEING CAPABLE OF REACTING WITH ISOCYANATE GROUPS, AND AN AQUEOUS EMULSION OF A POLYISOCYANATE ADDUCT WHICH IS STABLE IN THE PRESENCE OF THE NON-IONIC LATEX AND NON-REACTIVE UNTIL HEATED TOA TEMPERATURE WHICH REGENERATES FREE ISOCYANATE GROUPS IN REACTIVE FORM, SUBSTANTIALLY DRYING THE TREATED PAPER AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH FREE ISOCYANATA GROUPS ARE REGENERATED, AND HEATING THE DRIED PAPER TO A TEMPERATURE ABOVE ABOUT 140*C. FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE FREE ISOCYANATE GROUPS WHICH REACT WITH THE HYDROGEN AND HYDROXY GROUPS IN THE PAPER AND THE POLYMER.

Claim 3

A METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF CELLULOSE PAPER WHICH COMPRISES: IMPREGNATING SAID PAPER WITH A COMPOSITION COMPRISED OF BETWEEN 50 TO 100 PARTS BY WEIGHT OF SUBSTANTIALLY NON-IONIC VINYL ACETATE COPOLYMER LATEX SOLIDS WHEREIN THE VINYL ACETATE CHAIN PORTION OF SAID COPOLYMER CONTAINS HYDROGEN AND HYDROXY GROUPS AS SUBSTITUENTS ON SAID CHAIN CAPABLE OF REACTING WITH ISOCYANATE GROUPS, AN AQUEOUS EMULSION OF ABOUT 4 PARTS BY WEIGHT OF THE ADDUCT OF TOLUENE-2,4-DIISOCYANATE, TRIMETHYLOL PROPANE AND PHENOL, SAID ADDUCT BEING STABLE IN THE PRESENCE OF THE NON-IONIC LATEX AND NON-REACTIVE UNTIL HEATED TO A TEMPERATURE WHICH REGENERATES FREE ISOCYANATE GROUPS IN REACTIVE FORM, AND UP TO 50 PARTS BY WEIGHT OF A SUBSTANTIALLY NON-IONIC BUTADIENE-STYRENE COPOLYMER LATEX; SUBSTANTIALLY DRYING THE TREATED PAPER AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH FREE ISOCYANATE GROUPS ARE REGENERATED; AND HEATING THE DRIED PAPER TO A TEMPERATURE IN THE RANGE OF ABOUT 120*F. TO 350*F. FOR A PERIOD OF TIME RANGING FROM ABOUT 2 MINUTES TO 3 DAYS TO PROVIDE FREE ISOCYANATE GROUPS WHICH REACT WITH THE HYDROGEN AND HYDROXY GROUPS IN THE PAPER AND THE VINYL ACETATE COPOLYMER.

Claim 4

A METHOD OF IMPROVING THE PHYSICAL PROPERTIES OF CELLULOSE PAPER WHICH COMPRISES: IMPREGNATING SAID PAPER WITH A COMPOSITION COMPRISED OF BETWEEN 50 TO 100 PARTS BY WEIGHT OF SUBSTANTIALLY NON-IONIC VINYL ACETATE COPOLYMER LATEX SOLIDS WHEREIN THE VINYL ACETATE CHAIN PORTION OF SAID COPOLYMER CONTAINS HYDROGEN AND HYDROXY GROUPS AS SUBSTITUENTS ON SAID CHAIN CAPABLE OF REACTING WITH ISOCYANATE GROUPS, AN AQUEOUS EMULSION OF ABOUT 4 PARTS BY WEIGHT OF THE ADDUCT OF TOLUENE-2,4-DIISOCYANATE, TRIMETHYLOL PROPANE AND PHENOL, SAID ADDUCT BEING STABLE IN THE PRESENCE OF THE NON-IONIC LATEX AND NON-REACTIVE UNTIL HEATED TO A TEMPERATURE WHICH REGENERATES FREE ISOCYANATE GROUPS IN REACTIVE FORM, AND UP TO 50 PARTS BY WEIGHT OF A SUBSTANTIALLY NON-IONIC BUTADIENE-STYRENE COPOLYMER LATEX; SUBSTANTIALLY DRYING THE TREATED PAPER AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH FREE ISOCYANATE GROUPS ARE REGENERATED; AND HEATING THE DRIED PAPER TO A TEMPERATURE IN THE RANGE OF ABOUT 120*F. TO 350*F. FOR A PERIOD OF TIME RANGING FROM ABOUT 2 MINUTES TO 3 DAYS TO PROVIDE FREE ISOCYANATE GROUPS WHICH REACT WITH THE HYDROGEN AND HYDROXY GROUPS IN THE PAPER AND THE VINYL ACETATE COPOLYMER.