The Standard Oil Company

Herbert F Mazeke

Gerald P Coffey

June T Duke

Brandford E Giddings

William M Giffen, Jr

Dorothy C Prem

A stable aqueous latex of a copolymer containing at least about 40 percent by weight of a polymerized olefinic unsaturated nitrile is described. The copolymer comprises a main polymer core of from about 40 to 100 percent by weight of the polymerized nitrile and from about 0 to about 60 percent by weight of at least one other polymerized olefin monomer, said main polymer core being overpolymerized with a copolymer comprising a major proportion of a polymerized acrylate and from about one to 40 percent by weight of a polymerized olefinic unsaturated nitrile. A two-step method for preparing such a latex also is described. The latices of the invention are useful in forming films at low temperatures, and the minimum film forming temperature can be regulated by the selection of the particular components and the relative amounts of the components used to form the latices.

Film-forming olefinic nitrile polymer latex and method of preparing same

Molecular weight control is achieved in the production of acrylonitrile copolymers by means of an acid-activated mercaptan chain transfer agent.

Mercaptan activation by acid in the copolymerization of acrylonitrile

Acrylonitrile copolymers having controlled molecular weight are prepared using terpinolene or gamma terpinene as chain length modifier.

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Warrensville Heights, OH, United States of America

Herbert F Mazeke