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US 7,009,011 B1Granted
Copolymers of maleic anhydride by stable free redical polymerization
AssigneeXerox Corporation
InventorBarkev Keoshkerian
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AssigneeXerox Corporation
InventorBarkev Keoshkerian
Estimating the term…
A stable free radical process for preparing a polymer having acid anhydride functionality includes heating a mixture comprised of a stable free radical agent, maleic anhydride or derivative thereof, and at least one polymerizable electron donor monomer to initiate exothermic reaction and during exotherm of the reaction, adding additional amounts of stable free radical agent to control the reaction temperature. The mixture may also include a stable free radical initiator. In the mixture, the maleic anhydride or derivative thereof preferably comprises from about 10% to about 70%, molar basis, of a total amount of the maleic anhydride or derivative thereof and the at least one polymerizable electron donor monomer. Typically, the heating is to a temperature of from about 100° C. to about 160° C., and the rate of addition of the additional amounts of stable free radical agent is adjusted to control the reaction temperature to be about 160° C. or less.
A process for preparing a polymer comprising
A process for preparing a polymer comprising heating a mixture comprised of a free radical initiator, a stable free radical agent, maleic anhydride or derivative thereof, and at least one polymerizable electron donor monomer to about 100° C. to about 160° C., and when or prior to thermal initiation of the reaction starts, adding additional amounts of stable free radical agent to control the reaction temperature to about 160° C. or less, wherein the addition of the additional amounts of stable free radical agent continues at least until exotherm of the reaction is completed.
A process for preparing a polymer comprising
Dependencies are inferred from the claim text.