Method for preparing a benzophenone derivative
US11976166B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 2, 2019 |
| Grant date | May 7, 2024 |
| Priority date | — |
| Expiry date | May 4, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2650/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is method comprising the steps of a) contacting 4-hydroxyphenone and a salt thereof with propylene oxide in a reactor heated to a temperature in the range of from 100° C. to 200° C. to form a poly(propylene oxide)-benzophenone intermediate; then b) contacting the intermediate with ethylene oxide in the heated reactor to form an alkoxylated benzophenone substituted with propylene oxide groups and ethylene oxide groups. The method of the present invention is useful for preparing a non-volatile alkoxylated benzophenone photoinitiator that gives long lasting gloss retention in an exterior architectural coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.