C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/403, 402/405
C08F 226/06 (2006.01) C08F 26/06 (2006.01)
Patent
CA 1051143
ABSTRACT OF THE DISCLOSURE Improved process for the preparation of water-soluble, high mole- cular weight imidazole polymers comprising irradiating an aqueous solution of an imidazole monomer and a chemical, free-radical initiator under con- ditions to cause radiation-induced polymerization of the monomer, terminating radiation of the system when less than all the monomer has been converted to polymer and when the temperature of the system is such that the chemical, free-radical initiator dissociates with the proper rate to sustain poly- merization, and continuing the polymerization to completion by the free radicals generated by the thermal decomposition of the chemical initiator. The radiation-induced polymerization is terminated before more than 95% of the monomer is converted to polymer and preferably before 90% of the monomer is converted to polymer. The remaining monomer is converted to polymer by the free radicals generated by the thermal decomposition of the chemical initiator. Reaction conditions include: monomer concentrations from 15% to 90% by weight, radiation intensities of 10,000 to 1,000,000 rads per hour, and radiation dose from 5,000 to 500,000 rads. The imidarole polymers of this invention are particularly suitable for use as flocculating agents, viscosity control agents, municipal sewage treatment agents, sludge dewatering agents, dye mordants and optical brighteners for use in color photography, complexing and chelating agents, and clarifying agents.
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