METHOD FOR OBTAINING POLYESTER CARBONATE POLYOLS Russian patent published in 2018 - IPC C08G64/34 

FIELD: chemistry.

SUBSTANCE: method of obtaining polyester carbonate polyols is described, by joining alkylene oxides and carbon dioxide to one or more H-functional initiating substances in the presence of double metallocyanide catalyst (DMC-catalyst), characterized in that: (α) a suspending agent that does not contain H-functional groups in conjunction with the DMC-catalyst is charged to the reactor. As a suspending agent, at least one compound selected from the group consisting of 4-methyl-2-oxo-1,3-dioxolane, 1,3-dioxolan-2-one, acetone, methyl ethyl ketone, acetonitrile, nitromethane, dimethyl sulfoxide, sulfolane, dimethylformamide, dimethylacetamide, N-methyl-pyrrolidone, dioxane, diethyl ether, methyl tert-butyl ether, tetrahydrofuran, complex ethyl ester acetic acid, butyl ether complex of acetic acid, pentane, n-hexane, benzene, toluene, xylene, ethylbenzene, chloroform, chlorobenzene, dichlorobenzene, and carbon tetrachloride is used, and (β)the partial amount of alkylene oxide is added to the mixture charged in step (α) at a temperature of 90 to 150°C, and then adding the alkylene oxide compound is interrupted, (γ) one or more H-functional initiating substances, one or more alkylene oxides are dosed continuously during the reaction in the reactor in the presence of carbon dioxide. Herewith H-functional initiating substance is selected from at least one compound selected from the group consisting of ethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentandiol, 2-methylpropan-1,3-diol, neopentyl, 1,6-hexandiol, 1,8-octanediol, diethylene glycol, dipropyleneglycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, and simple polyetherpolyols with a molecular weight M_n of 150 to 4500 g/mol and a functionality of 2 to 3.

EFFECT: obtaining of a polyester carbonate polyol with a high content of carbon dioxide embedded in the polymer chain to achieve an optimum selectivity.

10 cl, 8 ex, 1 tbl