A N,N-dimethylacrylamide/2-acrylamido-2-methylpropane sulfonic acid copolymer is disclosed. The copolymer is particularly suitable for use as a viscosity control agent in an aqueous composition employed to facilitate petroleum recovery from subterranean petroleum bearing formations.
An improved process for the purification of diolefin monomers for anionic polymerization is disclosed. The purification process of this invention results in polymer which exhibits excellent chain growing.
The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having monomodal distribution of molecular structure in the arms of the block copolymer is described.
