Polyether polymerization process
US11820861B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Dec 11, 2019 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Aug 17, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2235/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Catalyst complexes include a zinc hexacyanocobaltate with M5 metal and M6 metal or semi-metal phases, wherein M5 metal is gallium, hafnium, manganese, titanium and/or indium and the M6 metal or semi-metal is one or more of aluminum, magnesium, manganese, scandium, molybdenum, cobalt, tungsten, iron, vanadium, tin, titanium, silicon and zinc and is different from the M5 metal. The catalysts are highly efficient propylene oxide polymerization catalysts characterized by rapid activation, short times to the onset of rapid polymerization and high polymerization rates once rapid polymerization has begun.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.