Novel method of removing residual acrylonitrile from latex systems
AssigneeThe Goodyear Tire & Rubber Company
InventorRichard R. Lattime
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Abstract
Acrylonitrile is a monomer that is widely used in the production of a vast variety of polymers. Undesirable quantities of residual unpolymerized acrylonitrile are often present in polymers. The residual or free acrylonitrile in polymers can be reacted with certain thiols in order to reduce their content in the polymer. In the reaction between these thiols and acrylonitrile products are formed which exhibit antioxidant ability.
Claims32
An improved process for preparing an acrylonitrile polymer latex containing an in situ antioxidant and for reducing the concentration of free acrylonitrile in an acrylonitrile polymer emulsion containing free acrylonitrile, comprising adding to said acrylonitrile polymer emulsion a thiol selected from the group consisting of thiol substituted paraffins and thiol substituted aromatic hydrocarbons wherein at least one thiol substituent has the general structural formula:
- ##STR7## and wherein n is an integer from 1 to 3, inclusive, in amounts and under conditions sufficient to react with said free acrylonitrile.
An improved acrylonitrile polymer latex containing an in situ antioxidant produced by the process comprising, adding to an acrylonitrile polymer emulsion containing free acrylonitrile a thiol selected from the group consisting of thiol substituted paraffins and thiol substituted aromatic hydrocarbons wherein at least one thiol substituent has the general structural formula:
- ##STR10## and wherein n is an integer from 1 to 3, inclusive, in amounts and under conditions sufficient to react with said free acrylonitrile.
Dependencies are inferred from the claim text.