The Standard Oil Company

Sohio

Dorothy C Prem

June T Duke

Ralph E Isley

Herbert F Mazeke

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

The impact resistance of high nitrile thermoplastic resins is greatly improved by including metal carboxylate compounds therein. Examples of metal carboxylate compounds useful herein include calcium stearate, calcium pelargonate, calcium laurate, zinc laurate, zinc stearate, aluminum distearate, aluminum laurate and aluminum pelargonate.

Impact improvement of high nitrile resins

The inclusion of a small amount of an ester-type plasticizer in the rubber polymerization recipe in the production of rubber-modified high nitrile copolymer resins produces resins having markedly improved impact resistance at both low and high temperatures.

Rubber-modified high nitrile copolymers with improved impact resistance

Impact-resistant polymers having low permeability to gases and vapors and excellent thermal color stability are prepared by polymerizing an olefinic nitrile, such as acrylonitrile, optionally with an olefinic ester, such as methyl acrylate, in an aqueous medium in the presence of an elastomer which is a copolymer of an ester of an olefinically unsaturated monocarboxylic acid, such as ethyl acrylate.

Impact-resistant olefinic-nitrile olefinic-ester copolymers prepared in

A polymerization process is described in which conjugated diolefin polymers are prepared by free-radical polymerization at improved rates by conducting the polymerization in a batch charge of all ingredients in aqueous emulsion in the presence of some preformed seed polymer having small particle size.

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Warrensville Heights, OH, United States of America

Dorothy C Prem