US 12,227,614 B2
Process for preparing polyoxyalkylene polyester polyols
Klaus Lorenz, Dormagen (DE); and Frank Kleinig, Dormagen (DE)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 17/782,749
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Dec. 14, 2020, PCT No. PCT/EP2020/085883
§ 371(c)(1), (2) Date Jun. 6, 2022,
PCT Pub. No. WO2021/122401, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19216930 (EP), filed on Dec. 17, 2019.
Prior Publication US 2023/0002552 A1, Jan. 5, 2023
Int. Cl. C08G 63/672 (2006.01); C08G 18/08 (2006.01); C08G 18/10 (2006.01); C08G 18/42 (2006.01); C08G 63/48 (2006.01); C08G 63/82 (2006.01); C08G 65/26 (2006.01); C08G 101/00 (2006.01)
CPC C08G 63/672 (2013.01) [C08G 18/10 (2013.01); C08G 18/14 (2013.01); C08G 18/4261 (2013.01); C08G 18/4263 (2013.01); C08G 63/48 (2013.01); C08G 63/82 (2013.01); C08G 65/26 (2013.01); C08G 2101/00 (2013.01); C08G 2110/0025 (2021.01); C08G 2650/36 (2013.01); C08G 2650/38 (2013.01)] 19 Claims
 
1. A process for preparing a polyoxyalkylene polyester polyol by reaction of a starter compound (1) having Zerewitinoff-active H atoms, a cyclic dicarboxylic anhydride (2) and a fatty acid ester (3) with an alkylene oxide (4) in the presence of a basic catalyst (5) comprising:
(i) providing a mixture (i) comprising the starter compound (1) and the fatty acid ester (3), wherein the mixture (i) contains no cyclic dicarboxylic anhydride (2);
(ii) reacting the mixture (i) from step (i) with a portion (v1) of the alkylene oxide (4), wherein at least 0.15 mol of alkylene oxide (4) per 1 mol of Zerewitinoff-active hydrogen atoms of the starter compound (1) is added to form a compound (ii);
(iii) reacting the compound (ii) formed in step (ii) by addition of the dicarboxylic anhydride (2) to form a compound (iii); and
(iv) reacting the compound (iii) from step (iii) with a portion (v2) of the alkylene oxide (4), wherein at least 1.15 mol of alkylene oxide (4) per 1 mol of the dicarboxylic anhydride (2) is added.