Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1975-08-18
1978-01-03
Tillman, Murray
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415924, 260 296TA, 260 296H, 526263, C08F 246, C08F 404, C08F 434
Patent
active
040665240
ABSTRACT:
Improved process for the preparation of water-soluble, high molecular weight imidazole polymers comprising irradiating an aqueous solution of an imidazole monomer and a chemical, free-radical initiator under conditions 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 polymerization, 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.
REFERENCES:
patent: 2666025 (1954-01-01), Nozaki
patent: 2891025 (1959-06-01), Price
patent: 3001922 (1961-09-01), Zimm
patent: 3036086 (1962-05-01), Adicoff
patent: 3114419 (1963-12-01), Perry et al.
patent: 3912607 (1975-10-01), Communal et al.
patent: 3926756 (1975-12-01), Restaino
Hercules Incorporated
Keehan Michael B.
Page Thurman K.
Tillman Murray
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