Cationic water-soluble polyamide-epichlorohydrin resins and method of preparing same

Claim 1

A PROCESS OF PREPARING AN AQUEOUS SOLUTION OF A CATIONIC, WATER-SOLUBLE THERMOSETTING RESIN WHICH COMPRISES (1) REACTING BY HEATING TOGETHER AT TEMPERATURES FROM ABOUT 40*C. TO ABOUT 70*C. EPICHLOROHYDRIN AND AN ALIPHATIC LONG-CHAIN BASIC WATER-SOLUBLE POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF (A) POLYAMIDES FORMED BY REACTING A POLYALKYLENE POLYAMINE HAVING TWO PRIMARY AMINO GROUPS AND FROM ONE TO THREE TERTIARY AMINO GROUPS, WITH A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPIC ACID, SUBERIC ACID, AND DIGLYCOLIC ACID IN A MOLE RATIO OF POLYALKYLENE POLYAMINE TO DICARBOXYLIC ACID OF FROM ABOUT 0.8:1 TO ABOUT 1.4:1 AND (B) POLYAMIDES FORMED BY REACTING A POLYALKYLENE POLYAMINE HAVING TWO PRIMARY AMINO GROUPS AND AT LEAST ONE SECONDARY AMINO GROUP WITH A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPIC ACID, SUBERIC ACID, AND DIGLYCOLIC ACID, THE MOLE RATIO OF POLYALKYLENE POLYAMINE TO DICARBOXYLIC ACID BEING FROM ABOUT 0.8:1 TO ABOUT 1.4:1 AND REACTING THEH POLYAMIDE WITH AN ALKYLATING AGENT TO CONVERT AT LEAST 70% OF THE SECONDARY AMINO GROUPS TO TERTIARY AMINO GROUPS, THE BASICITY OF SAID POLYAMIDE BEING DUE ESSENTIALLY TO THE PRESENCE OF TERTIARY AMINO GROUPS, SAID TERTIARY AMINO GROUPS CONSTITUTING AT LEAST 70% OF THE BASIC NITROGEN GROUPS PRESENT IN THE POLYAMIDE, AND THE MOLE RATIO OF EPICHLOROHYDRIN TO AMINO GROUPS OF SAID POLYAMIDE BEING FROM ABOUT 0.8:1 TO ABOUT 2.0:1, (2) CONTINUING THE REACTION UNTIL AN AQUEOUS SOLUTION OF A WATER-SOLUBLE CATIONIC THERMOSETTING RESIN IS FORMED, AND THEN (3) TERMINATING THE REACTION.