Method for the preparation of polymer polyols
US12258436B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2023 |
| Grant date | Mar 25, 2025 |
| Priority date | — |
| Expiry date | Nov 29, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/185
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.