Styrene → Acrylonitrile butadiene styrene

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The procedure of Example i was repeated except a total of 273 grams of acrylonitrile was used instead of the total of 546 grams as per Example 1. In this example, the incremental addition was repeated except only one half of each amount of acrylonitrile was used. A portion of the latex was isolated for subsequent blending and the remaining latex coagulated as per Example 1. The dry rubber had a Mooney viscosity (100° C.) of 127, a bound acrylonitrile content of 3.8 weight percent (by Carlo Erba nitrogen analysis), a bound styrene content of 40.4 weight percent (by FTIR analysis) and a glass transition temperature of -28° C. (by DSC, Differential Scanning Calorimetry).

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