PROCESS FOR PREPARING MACROMONOMER Russian patent published in 2018 - IPC C08G65/26 C08G65/28 C09K8/12 C09K8/588 

FIELD: chemistry.

SUBSTANCE: present invention relates to a process for the preparation of hydrophobically associating macromonomers of M and novel macromonomers. Described is a process for the preparation of a macromonomer M of general formula (I) H₂C=C(R¹)-R²-O-(-CH₂-CH₂-O-)_k-(-CH₂-CH(R³)-O-)_l-(-(-CH₂-CH₂-O-)_m-R⁴ (I), wherein structural units (-CH₂-CH₂-O-)_k and (-CH₂-CH(R³)-O-)_l and optionally -(-CH₂-CH₂-O-)_m in the block structure are located in the sequence represented in formula (I) wherein the residues and indices have the following values: k is a number from 10 to 150; l is a number from 5 to 25; m is a number from 0 to 15; R¹ is H; R² independently of each other, is a divalent linking group -O-(C_n'H_2n')-, where n' is a natural number from 3 to 5; R³ independently of one another, is a hydrocarbon radical having 2 to 14 carbon atoms, with the proviso that the total number of carbon atoms in all hydrocarbon residues R³ is in the range from 15 to 50; R⁴ is H, which includes the following steps: a) reacting monoethylenically unsaturated alcohol A1 of general formula (II) H₂C=C(R¹)-R²-OH (II), with ethylene oxide, wherein radicals R¹ and R² have values given above; with the addition of alkaline catalyst K1 containing KOMe and/or NaOMe; wherein alkoxylated alcohol A2 is obtained; b) reacting alkoxylated alcohol A2 with at least one alkylene oxide Z of formulae (Z), where R³ has the above value; with addition of alkaline catalyst K2, wherein catalyst K2 comprises at least one basic sodium compound selected from NaOH, NaOMe and NaOEt; wherein the potassium ion concentration during the reaction in step b) is less than or equal to 0.9 mol% relative to alcohol A2 used; and wherein the reaction in step b) is carried out at a temperature below or equal to 135°C, wherein alkoxylated alcohol A3 is obtained according to formula (III), H₂C=C(R¹)-R²-O-(-CH₂-CH₂-O-)_k-(-CH₂-CH(R³)-O-)_l-R⁴ (III), where R⁴=H, where the residues R¹, R² and R³ and indices k and l have the values given above; c) optionally, reacting at least a portion of alkoxylated alcohol A3 with ethylene oxide, wherein alkoxylated alcohol A4 is obtained which corresponds to macromonomer M according to formula (I), wherein R⁴= H, and m is greater than 0. Macromonomer obtained using said method is also described.

EFFECT: technical result is the production of hydrophobically associating macromonomers having a small number of cross-linking groups and which can be polymerised to produce copolymers with a small amount of gels.

19 cl, 1 tbl, 30 ex