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US 10,647,823 B2Granted
Adiabatic gel polymerization process for the production of water-soluble polyelectrolytes
AssigneeSolenis Technologies, L.P.
InventorsPatric Bierganns, Markus Bröcher, Christian Dollendorf
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Abstract
The current process relates to an adiabatic gel polymerization process for the production of water-soluble polyelectrolytes using UV LED modules or a combination of a UV tube light sources and UV LED modules wherein the resulting polymer has increased throughput, lower residual monomer content as well as lower insolubles compared with current photoinitiated polymerization processes.
Claims20
An adiabatic gel polymerization process for the production of water-soluble polyelectrolytes comprising:
- providing a monomer solution comprising an aqueous acrylamide, an ethylenically unsaturated monomer, and a photoinitiator;
- purging the monomer solution to remove oxygen and adjusting the pH to about 3-7 and a temperature below 25° C.;
- initiating photopolymerization utilizing a UV light source having a wavelength of from about 365 nanometer (nm) to about 395 nm and an intensity of from about 0.1 mW/cm2 to about 2.5 mW/cm2 until the temperature reaches from about 40° C. to about 80° C.;
- increasing the intensity of the UV light source to from about 5 mW/cm2@365±10 nm to about 50 mW/cm2@365±10 nm until reaching the maximum reaction temperature of from about 60° C. to about 150° C.;
- producing a gelatinous polymer;
- drying the gelatinous polymer and comminuting the dried product to a desired particle size.
3 more elements
Dependencies are inferred from the claim text.