COPOLYMERS CONTAINING CARBOXYLIC ACID GROUPS, SULPHONIC ACID GROUPS AND POLYALKYLENE OXIDE GROUPS AS ANTI-SCALING ADDITIVE TO WASHING AND CLEANING AGENTS Russian patent published in 2016 - IPC C11D3/37 C08F220/06 C08F220/38 C08F228/02 C08F216/14 C11D3/00 

FIELD: chemistry.

SUBSTANCE: invention discloses copolymers containing a1) 30-90 wt % of monomer units of at least one monomer selected from acrylic acid, methacrylic acid and salts thereof, a2) 3-60 wt % of units at least one sulphonic acid group-containing monomer, a3) 3-60 wt % of units at least one nonionic monomer of formula (I) H₂C=C(R¹)(CH₂)_x[R²-O]_o-R, wherein R¹ is hydrogen or methyl, R² denotes identical or different, straight or branched alkylene residues with 2-6 carbon atoms which can be ordered in a block manner or statistically, R³ is hydrogen or a straight or branched alkyl residue with 1-4 carbon atoms, x is equal to 0, 1 or 2 and o is a natural number from >5 to 50, a4) 0-30 wt % of units of one or more other ethylenically unsaturated monomers capable of polymerisation with monomers a1), a2) and a3), wherein the sum of a1), a2), a3) and a4) is 100 wt %.

EFFECT: efficient dishwashing using a dishwashing machine.

21 cl, 5 tbl, 8 ex