| abstract |
A ternary copolymer which comprises (a) unit of a polyoxyalkylene alkenyl ether, (b) unit of alkenylsulfonic acid, and (c) unit of a maleic acid compound as essential monomer units; contains essential monomer units (a), (b) and (c) in amounts satisfying a relation: {(a) + (b)} : (c) = 3 : 7 to 7 : 3 by mol, and a relation: (a) : (b) = 1 : 5 to 99 : 1 by mol; and has a weight-average molecular weight of 500 to 100,000. n The copolymer is stable against hydrolysis and useful as a macromolecular surfactant. |