. . . "The diene-styrene and dienealkylstyrene copolymers also possess the desirable solubility in petroleum and other industrial fluids and may be used as block A. Such dienes as preferably butadiene and isoprene, and also 2,3-dimethylbutadiene, 2,3-diphenylbutadiene, and others of the structure ##EQU2## the dangling valences being substituted by hydrogen or alkyl or aryl groups of C1 to C10, and styren" . .