METHOD FOR PRODUCING A POWDERED ULTRA-HIGH MOLECULAR WEIGHT POLYMER Russian patent published in 2022 - IPC C08F10/08 C08F10/10 C08F10/14 C08F110/10 C08F110/14 C08F210/08 C08F210/14 C08F4/643 F17D1/17 

FIELD: polymers.

SUBSTANCE: invention relates to a method for producing a powdered ultra-high molecular weight polymer capable of reducing the hydrodynamic resistance. Method for producing a powdered ultra-high molecular weight polymer capable of reducing the hydrodynamic resistance, with a characteristic viscosity in the range from 10 dl/g to 35 dl/g, is implemented by polymerising alpha-olefins with a carbon chain consisting of at least four carbon atoms used as monomers in a polymerisation reactor equipped with a mixing apparatus, as well as loading and unloading holes. Method includes the following stages: a. adding a titanium halide-based catalyst on a magnesium chloride matrix with or without applying an internal donor, or without the matrix with or without applying an internal donor, to the polymerisation reactor; b. adding a solvent selected from hexane, benzene, decane, chlorobenzene, toluene, xylene, and combinations thereof; c. adding a co-catalyst, wherein the co-catalyst is an organoaluminium compound; d. adding alpha-olefins with a carbon chain consisting of at least four carbon atoms used as monomers to the polymerisation reactor in order to produce a polymerisation mix, wherein the polymerisation mix is subjected to continuous stirring at a temperature in the range from -10 °C to 10°C with the reaction lasting from 12 to 24 hours in order to achieve conversion in the range from 90 to 98%, wherein the polymerisation stage is implemented under conditions of inertness and absence of oxygen; wherein the pressure in the polymerisation reactor is from 0.5 to 1 bar, and the monomer is selected from butene-1, hexene-1, octene-1, decene-1, dodecene-1, and combinations thereof.

EFFECT: method for producing an easily extractable ultra-high molecular weight polymer constituting a highly effective polymer drag-reducing additive (DRA), reduction in the polymerisation time, achievable polymerisation temperatures, and high conversion rate.

3 cl, 8 ex