COPOLYMER OF ACRYLIC OR METHACRYLIC ACID WITH ESTERS THEREOF, FUNCTIONAL ADDITIVE FOR CEMENT MIXTURES AND METHOD OF OBTAINING AQUEOUS SOLUTIONS OF COPOLYMERS Russian patent published in 2011 - IPC C08F220/06 C04B24/26 

FIELD: chemistry.

SUBSTANCE: described is a copolymer of acrylic or methacrylic acid with esters thereof of general formula

, where R¹, R³, R⁴ - H, CH₃, R² - C_1-2 alkyl, Alk - C_2-3 alkylene, Me - alkali metal, l=12-16, m=10-12, p=11-12, r=62-65, n=15-25, q=4-9. The invention also describes a functional additive for cement mixtures, which contains a copolymer of acrylic or methacrylic acid with esters thereof and water, characterised by that the copolymer of acrylic or methacrylic acid with esters thereof is the copolymer described above, with the following ingredients with the given ratio in wt %: copolymer 25-35, water 65-75. Described is a method of preparing aqueous solution of the said copolymer.

EFFECT: high plasticising effect of the additive, high rate of strength gain of the hardened cement paste formed.

3 cl, 1 tbl, 8 ex