Ionically cross-linked low molecular weight ternary copolymer.

摘要

An ionically cross-linked low molecular weight ternary copolymer which comprises reacting at least a part or the whole of acid groups in a low molecular weight ternary copolymer with a metallic cation selected from valences of 1 to 3, a content of ethylene being 80 - 99.5 mol% and a total content of acrylic or methacrylic acid and alkyl acrylate or methacrylate being 0.5 - 20 mol% in the above low molecular weight ternary copolymer, a ratio of composition between the acid and the ester being 10 - 90 to 90 - 10%, and a viscosity-average molecular weight of the low molecular weight ternary copolymer being within a range of 500 - 20,000.