Aqueous dispersion of cationic ethylenic copolymer.

摘要

An aqueous dispersion of a cationic polymer is obtained by reacting (a) I part by wt% of pellets or powder of an ethylene copolymer comprising 40 to 80% by weight of ethylene and 20 to 60% of at least one aminoalkyl acrylamide comonomer of formula: wherein R1 is hydrogen or methyl; R2 and R3 each is hydrogen or C1-4 alkyl; and n is an integer of 2 to 4, and optionally up to 20 wt% of a comonomer (e.g. an acrylate) and having a melt index (JIS K-6760) of 10 to 1,000 g/10 min, with (b) 0.5 - 2 parts hydrochloric acid in water, to form a quaternary salt, and addition-reacting this salt with an epihalohydrin compound at 20 - 100 DEG C, and optionally further reacting with 0.2 - 2 parts of an alkylolamine compound (e.g. diethanolamine). The dispersion provides a coating film having an improved electrical conductivity in an electrographic material, or when included in paper it simultaneously improves degree of sizing and wet strength thereof.