Patent ID: 6174963
Filing Date: 2001-01-16
Classification: C08F,C09D,Y10S

Abstract:
A method for producing an amphoteric resin having dispersing function which comprises polymerizing the following prepolymer A.sub.2, prepolymer B.sub.2 and component C as essential components to graft copolymerize the prepolymer A.sub.2 and the prepolymer B.sub.2 on the main chain of the polymer of the component C so that amount of A.sub.2 is in the range of 0.1-85% by weight, that of B.sub.2 is in the range of 0.1-85% by weight, and that of C is in the range of 0.1-96% by weight with the total amount of A.sub.2, B.sub.2 and C being 100% by weight:prepolymer A.sub.2 which is copolymerizable and has a copolymerizable double bond and amino group and acid group together and which is obtained by reacting a prepolymer A.sub.1 having a weight-average molecular weight of 1000-30000 and being obtained by polymerization of an amino group-containing .alpha., .beta.-ethylenically polymerizable compound, other .alpha., .beta.-ethylenically polymerizable compound and a polymerization initiator containing a carboxyl group at an end, with a compound having an epoxy group represented by the following formula (I): ##STR4##(wherein R.sup.1 represents H or a methyl group, and R represents a straight or branched chain alkyl group of 1-10 carbon atoms) in an amount of 0.1-1.0 equivalent for the amino group equivalent of the prepolymer A.sub.1 ;prepolymer B.sub.2 which is copolymerizable and is obtained by reacting a prepolymer B.sub.1 having a weight-average molecular weight of 1000-30000 and being obtained by polymerization of a carboxyl group-containing .alpha., .beta.-ethylenically polymerizable compound, other .alpha., .beta.-ethylenically polymerizable compound and a polymerization initiator, with a compound having an epoxy group represented by the above formula (I) in an amount of 0.1-1.0 equivalent for the carboxyl group equivalent of the prepolymer B.sub.1 ; andcomponent C which is .alpha., .beta.-ethylenically copolymerizable with A.sub.2 and B.sub.2.