METHOD FOR PRODUCTION OF ORGANIC POLYELECTROLYTE Russian patent published in 2003 - IPC

FIELD: polymer production. SUBSTANCE: invention relates to production of synthetic low-molecular polyelectrolytes, polymers and copolymers (MW <1,5•10⁶), based on a series of acrylamides including groups capable of ionization in solution, which polyelectrolytes are applicable water suspension dispersants, emulsion stabilizers, as boring aids under complicated boring conditions, and when creating artificial soil structure. Invention provides a method for production of organic ampholyte polyelectrolyte involving formation of stable reverse acrylamide monomer emulsions in presence of mineral salts and molecular weight regulator, subsequent peroxide- initiated polymerization, and hydrolysis of organic species in presence of sodium hydroxide aqueous solution, said mineral salts being I group metal salts used in amounts 10-13% of the weight of aqueous phase, said molecular weight regulator being monoaminomonocarboxylic amino acids containing methylated sulfhydryl groups in mixture with hydrolyzed acrylamide in amount 25-27% of the weight of monomer, continuous phase of dispersion being low-freezing hydrocarbon oil, and emulsifier mixture of fatty acid esters with triethanolamine. Formation, composition, and temperature of reverse water-oil emulsion are leveled by means of turbulent emulsification accompanied by cooling of emulsion and water- dissolved monomer charge portionwise added to emulsion, mineral salts, and molecular weight regulator. Emulsion polymerization in water-oil emulsion is conducted under adiabatic conditions at temperature 5 to 60 C in presence of peroxide initiator taken at ratio to monomer ensuring full conversion thereof. Hydrolysis of polymerization products is effected with supplementary addition of sodium hypochlorite in amount 0.5% of the weight of monomer at sodium hypochlorite-to-sodium hydroxide ratio 1:36. Resulting organic polyelectrolyte - low-molecular anionic copolymer contains between ~20 and ~80 % acrylamide units and between ~80 and ~20 % sodium acrylate units of the weight of copolymer having intrinsic viscosity 1.5-4.5. Copolymer is well soluble in water wherein copolymer manifests ionic activity as evidenced by pH values between 7.5 and 10 and is offered in the form of emulsion in hydrocarbon oil preserving heat and frost resistances as well as phase stability within temperature range between +175 and -35 C and mobility at temperatures up to -35 C. EFFECT: extended assortment of variousdestination polyelectrolytes. 8 cl, 2 tbl, 11 ex