American Cyanamid Company

Albert G Robustelli

Roderick Glyn Ryles

Hans P Panzer

Anthony T Coscia

James V Cicchiello

Roland Ralph DiLeone

A new and improved composition and method for profile modification of subterranean formations characterized by high reservoir temperatures and/or harsh brine conditions are disclosed. The new and improved profile modification agents comprise a gelable composition comprising:

High temperature profile modification agents and methods for using same

Copolymers of 2-acrylamido-2-methylpropane sulfonic acid or its salts are used to maintain the viscosity of aqueous solutions thereof in the presence of divalent salt containing-waters during the enhanced recovery of petroleum from sub-terranean petroleum-bearing deposits.

Method for using thermally stable mobility control agents for harsh

Water-soluble cross-linked cationic polysulfonium derivatives of poly(thiodiethanol)ethers are useful flocculants for suspended solids in aqueous medium.

Process for flocculation using crosslinked polysulfonium compounds

Water-soluble cross-linked polysulfonium derivatives of poly(thiodiethanol) ethers are provided by reacting the ethers with difunctional sulfide-reactive alkylating agents.

Water-soluble crosslinked polysulfonium compounds and process therefor

A molding composition of improved toughness, thermal stability, flow and stress craze resistance comprising (A) from about 70 to about 95% of a resinous terpolymer of 65 to 75 parts of methylmethacrylate, 18 to 24 parts of styrene and 2 to 12 parts of ethylacrylate and (B) 5% to 30% of polybutadiene grafted with 17 to 22 parts of methylmethacrylate, 4 to 7 parts of styrene and 0 to 3 parts of ethylacrylate, the ratio of polybutadiene to monomer in (B) ranging from 1:1 to 4:1, respectively.

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Darien, CT, United States of America

Albert G Robustelli