Method for the preparation of polymer polyols
AssigneeRepsol, S.A.
InventorsJuan Pedro Pérez Valencia, José Antonio Carazo Angulo, Félix Fernández Villar
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Abstract
The present invention refers to the use of hydrofoil impellers for the preparation of polymer polyols and to a method for preparing a polymer polyol, which comprises 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, wherein said reactor is stirred by means of a stirring system comprising a shaft rotatable about its longitudinal axis, and a plurality of radially extending hydrofoil impellers mounted on the shaft and respectively axially spaced apart and wherein the reactor does not contain baffles.
Claims20
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.
Dependencies are inferred from the claim text.