METHOD OF SYNTHESIS OF COPOLYMERS EXHIBITING HIGH MOISTURE RETENTIVITY Russian patent published in 1997 - IPC

FIELD: chemistry of polymers, agrochemistry. SUBSTANCE: copolymerization of acrylic acid or acrylic acid and acrylamide with water-soluble polysaccharide allyl ester of the general formula: [C₆H₇O₂(OH)_3-x-y-(R₁)_x-(R₂)_y]_n where: R₁ - O-(CH₂-CH₂O)_z-H, O-CH₂--COONa, O-(-CH₂-CHCH₃O)_z-H, OCH₃, O-CH₂-CH-SO₃-Na, NH₂, OH; R₂ - O-CH₂-CH=CH₂; x = 0.5-2.5; y = 0.05-1.1; z = 1.5-3; n = 50-3050 is carried out in the presence of radical initiating agent of two-component system containing cobalt (III) acetate and alkaline metal or ammonium persulfate at their mole ratio = (1: 0.5)-(1:60) in an aqueous solution at temperature changing in the process of polymerization from 50 to 130 C and at concentration of cobalt (III) acetate (0.05-0.7) x 10^-3 M, alkaline metal or ammonium persulfate - (0.35-3.0) x 10^-3 M, water-soluble polysaccharide allyl ester - 0.03-5.0 wt.-% and comonomers - 15-40 wt.-%. EFFECT: improved method of synthesis. 2 cl