Method of preparing dimethylcetene and, subsequently, polydimethylcetene from isobutyric anhydride
US7435856B2 · kind B2 · utility
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3References
20Claims
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Key dates
| Filing date | Feb 20, 2004 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Feb 20, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C49/88
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of dimethylketene (DMK) and then of polydimethylketene (PDMK) by polymerization of DMK. More specifically, the DMK is obtained by pyrolysis by isobutyric anhydride (IBAN), the latter decomposing under the effect of heat (pyrolysis) to give isobutyric acid (IBA) and DMK. One mole of pyrolyzed IBAN gives one mole of IBA and one mole of DMK.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.