Application of coating or impregnating materials to fibrous material

Claim 1

A PROCESS FOR IMPREGNATING FIBROUS CELLULOSIC MATERIAL WITH A WATER-SOLUBLE, CORBOXYL-CONTAINING MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYMERS OF ACRYLIC ACID, COPOLYMERS OF ACRYLIC ACID AND COMPOUNDS COPOLYMERIZABLE THEREWITH SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, ACRYLONITRILE AND METHACRYLONITRILE, POLYMERS OF METHACRYLIC ACID, AND COPOLYMERS OF METHACRYLIC ACID AND COMPOUNDS COPOLYMERIZABLE THEREWITH SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, ARCYLONTRILE AND METHACRYLONITRILE, WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF THE FIBROUS CELLULOSIC MATERIAL AT A CONSISTENCY FROM ABOUT 0.1% TO ABOUT 5%, ADDING TO SUCH AQUEOUS SUSPENSION (1) FROM ABOUT 0.1% TO ABOUT 5%, BASED ON THE DRY WEIGHT OF FIBROUS CELLULOSIC MATERIAL, OF A CATIONIC THERMOSETTING RESIN OBTAINED BY REACTING A POLYALKYLENE POLYAMINE HAVING TWO PRIMARY AMINE GROUPS AND AT LEAST ONE SECONDARY AMINE GROUP WITH A C3-C10 SATURATED ALIPHATIC DICARBOXYLIC ACID AT A TEMPERATURE FROM ABOUT 110* C. TO ABOUT 250* C. AND IN A MOLE RATIO OF POLYALKYLENE POLYAMINE TO DICARBOXYLIC ACID OF FROM ABOUT 0.8:1.0 TO ABOUT 1.4:1.0 TO FORM A LONG-CHAIN POLYAMIDE HAVING SECONDARY AMINE. GROUPS, AND THEN REACTING THE POLYAMIDE WITH EPICHLOROHYDRIN AT A TEMPERATURE FROM ABOUT 45* C. TO ABOUT 100* C. AND IN A MOLE RATIO OF EPICHLOROHYDRIN TO SECONDARY AMINE GROUPS OF SAID POLYAMIDE FROM ABOUT 0.5:1 TO ABOUT 1.8:1, AND (2) A WATER-SOLUBLE, CARBOXYL-CONTAINING MATERIAL SELECTED FROM THE INDICATED GROUP, WHEREBY A SUBSTANTIAL PORTION OF SAID WATER-SOLUBLE, CARBOXYL-CONTAINING MATEIAL IS DEPOSITED ON AND ATTACHED TO SAID FIBROUS MATERIAL TOGETHER WITH SAID CATIONIC THERMOSETTING RESIN.