Ketone bisulfites as reducing agent for free radical polymerization
AssigneeAir Products and Chemicals, Inc.
InventorsRobert K. Pinschmidt, Jr., Finn L. Marten
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Abstract
This invention relates to an improvement in a process for producing a latex containing dispersed polymer. The improvement in the process for polymerizing a reaction mixture of vinyl monomer, stabilizer, oxidizing agent and reducing agent comprises using a water-soluble ketone bisulfite as the reducing agent, either alone or with other reducing agents, the ketone having from 3 to 8 carbon atoms in the structure. During the polymerization, the ketone bisulfite is maintained in stoichiometric excess of the oxidizing agent. Vinyl acetate-ethylene copolymers are some of the preferred polymer systems produced.
Claims12
In a process for producing a latex containing a dispersed polymer therein by polymerizing a reaction mixture containing vinyl monomer, water, stabilizer and a catalyst consisting of oxidizing agent, a reducing agent and a transition metal salt, the improvement which comprises
- using a water-soluble ketone bisulfite as a component of said reducing agent, said ketone having from 3 to 8 carbon atoms in the structure and said ketone bisulfite being present in an amount greater than 75% by weight of said reducing agent.
Dependencies are inferred from the claim text.