POLYESTER POLYOLS FROM ISOPHTHALIC ACID AND/OR TEREPHTHALIC ACID AND OLIGOALKYLENE OXIDES Russian patent published in 2014 - IPC C08G63/181 C08G63/66 C08G18/42 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing polyester polyol with concentration of ether groups between 9.0 mol/kg polyester polyol and 22 mol/kg polyester polyol, use of the polyester polyol obtained using said method, a method of producing PUR- or PUR/PIR foam plastic based on polyester polyol, as well as use of said PUR- or PUR/PIR foam plastic. The method of producing polyester polyol includes (i) at the first step (A) isophthalic acid, optionally in form of an alkyl ether with 1-4 carbon atoms in the alkyl, and/or terephthalic acid, optionally in form of an alkyl ether with 1-4 carbon atoms in the alkyl, reacts with (B) an oligoethylene glycol of formula H-(OCH₂CH₂)_n-OH with an average number of oxyethylene groups n between 3.0 and 9.0 in the presence of at least one catalyst selected from a group consisting of tin (II) salts, bismuth (II) salts and titanium tetraalkoxylates, at temperature between 160°C and 240°C and pressure between 1 and 1013 mbar for 7 to 100 hours, and (ii) at the second step, the reaction mixture obtained at step (i) reacts with (C) phthalic acid and/or phthalic acid anhydride.

EFFECT: obtaining polyester polyols which, when used in PUR/PIR rigid foam materials, improve incombustibility.

13 cl, 2 tbl, 11 ex