US 12,258,436 B2
Method for the preparation of polymer polyols
Juan Pedro Pérez Valencia, Madrid (ES); José Antonio Carazo Angulo, Madrid (ES); and Félix Fernández Villar, Madrid (ES)
Assigned to REPSOL, S.A, Madrid (ES)
Appl. No. 18/720,840
Filed by REPSOL, S.A., Madrid (ES)
PCT Filed Nov. 29, 2023, PCT No. PCT/EP2023/083452
§ 371(c)(1), (2) Date Jun. 17, 2024,
PCT Pub. No. WO2024/126039, PCT Pub. Date Jun. 20, 2024.
Claims priority of application No. 22383216 (EP), filed on Dec. 15, 2022.
Prior Publication US 2024/0417507 A1, Dec. 19, 2024
Int. Cl. C08G 18/00 (2006.01); B01J 19/00 (2006.01); B01J 19/06 (2006.01); B01J 19/18 (2006.01); C08F 283/06 (2006.01); C08G 18/63 (2006.01)
CPC C08G 18/632 (2013.01) [B01J 19/0066 (2013.01); B01J 19/06 (2013.01); B01J 19/18 (2013.01); C08F 283/06 (2013.01); B01J 2219/00031 (2013.01); B01J 2219/00033 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for preparing a polymer polyol, comprising reacting a base polyol, at least one ethylenically unsaturated monomer, and a macromer or a preformed stabilizer, in the presence of a free-radical initiator and optionally a chain transfer agent in a reactor (1), wherein said reactor (1) is stirred by means of a stirring system comprising a shaft (2) rotatable about its longitudinal axis (3), and a plurality of radially extending hydrofoil impellers (4) mounted on the shaft (2) and respectively axially spaced apart and wherein the reactor (1) does not contain baffles.