CONTINUOUS METHOD FOR OBTAINING HIGHLY BRANCHED POLYMERS BASED ON MONOETHYLENE UNSATURATED MONO- OR DICARBONIC ACID CONTAINING FROM 3 TO 8 CARBON ATOMS, OR ANHYDRIDES AND SALTS THEREOF Russian patent published in 2019 - IPC C08F2/01 C08F2/10 C08F2/16 C08F20/00 B01F13/00 B01J19/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a continuous process for the preparation of highly branched ethylene unsaturated monocarboxylic acid homo- or copolymers. Continuous process for the preparation of homo- or copolymers of a monoethylene unsaturated monocarboxylic acid containing from 3 to 8 carbon atoms, or its salts (monomer A) is carried out with free radical polymerization of monomer A and optionally free radical polymerization of water-soluble ethylenically unsaturated monomers (monomer B), other than monomer A, in an aqueous medium in the presence of at least one water-soluble initiator. Method differs in that it includes the following stages: I) optionally continuous dosing of the monomer solution(s) and the initiator solution into the mixing device comprising at least one micromixer and mixing the reactants in the mixing device, II) carrying out continuous free radical polymerization in at least one segment of a tubular reactor at a temperature from 180 °C to 300 °C, where the tubular reactor has a specific surface area of more than 50 m²/m³ and where the entire reactor system contains at least one pressure regulating device, the polymerization is carried out in the absence of traditional chain transfer agents, and wherein the polymer has a degree of branching equal to or higher than 7 mol% relative to the total amount of monomers. Declared polymer obtained by the method, and its application.

EFFECT: obtaining highly branched polymers with a minimum content of heteroatoms, which are used as cross-linking agents.

17 cl, 3 tbl, 3 dwg