Removal of acrylonitrile from latex with saturated heterocyclic amines
AssigneeThe Goodyear Tire & Rubber Company
InventorMichael L. Senyek
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Abstract
Acrylonitrile is a monomer that is widely used in the synthesis of a vast variety of polymers. Undesirable quantities of unpolymerized residual acrylonitrile are often present in these acrylonitrile polymers. This residual or free acrylonitrile dissolved in an acrylonitrile polymer and/or its emulsifier system and the water phase used in its polymerization can be reduced significantly in concentration by treatment with saturated 6 to 7 membered ring heterocyclic amines. These amines react with acrylonitrile by a nitrogen-cyanoethylation reaction which results in the formation of a tertiary amino linkage.
Claims12
An improved process for reducing the concentration of free acrylonitrile in an acrylonitrile polymer emulsion containing free acrylonitrile, comprising adding to said acrylonitrile polymer emulsion a saturated 6 to 7 membered ring heterocyclic amine wherein said ring contains at least one secondary amine moiety in amounts and under conditions sufficient to react with said free acrylonitrile to form a tertiary amino linkage.
An improved process for reducing the concentration of free acrylonitrile in an acrylonitrile polymer emulsion containing free acrylonitrile, comprising adding to said acrylonitrile polymer emulsion a saturated 6 to 7 membered ring heterocyclic amine selected from the group consisting of piperazine hexahydrate, piperazine, homopiperazine, N-(2-aminoethyl)piperazine, 4-(aminomethyl)piperidine, 2-methylpiperazine, 2,6-dimethylpiperazine, and 2,5-dimethylpiperazine in amounts and under conditions sufficient to react with said free acrylonitrile to form a tertiary amino linkage.
Dependencies are inferred from the claim text.