Arco Polymers, Inc.

Atlantic Richfield Company

Le-Khac Bi

Ralph Milkovich

Kenneth W Doak

Clyde Sharik

Mary E Dillon

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.

N,N-Dimethylacrylamide/2-acrylamido-2-methylpropane sulfonic acid

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.

Diolefin monomer purification process for anionic polymerization

Copolymers having a backbone of alternating polymer block and silicon units are described. The copolymers exhibit fire retardant properties.

Copolymers having a backbone of alternating polymer blocks and silicon

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.

Clear impact resistant thermoplastic star-block copolymers

The preparation of a branched, radial block copolymer having improved falling weight impact properties, and having trimodal distribution of molecular structure in the arms of the block copolymer is described.

The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C. is described.

The preparation of a branched, radial block copolymer having improved falling weight impact properties, especially at temperatures from room temperature to -40.degree. C., and having bimodal distribution of molecular structure in the arms of the block copolymer is described.

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