US Patent 7435856 Method of preparing dimethylcetene and, subsequently, polydimethylcetene from isobutyric anhydride

Patent 7435856 was granted and assigned to Arkema on October, 2008 by the United States Patent and Trademark Office.

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Patent

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Current Assignee

Arkema

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7435856

Date of Patent

October 14, 2008

Patent Application Number

10545977

Date Filed

February 20, 2004

Patent Primary Examiner

‌

Sikarl A. Witherspoon

Patent 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.

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