Method of preparing dimethylcetene and, subsequently,...

Details Method of preparing dimethylcetene and, subsequently,... Method of preparing dimethylcetene and, subsequently,...

2004-02-20

2008-10-14

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

07435856

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.

REFERENCES:
patent: 3201474 (1965-08-01), Hasek et al.
patent: 5169994 (1992-12-01), Sumner et al.
patent: 5258556 (1993-11-01), Sumner et al.
Pregaglia G; Binaghi: “Polymerisation of dimethylketene. A. Dimethylketene by pyrolysis of isobutryic anhydride” Macromolecular Syntheses, vol. 1968, No. 3, 1969, pp. 152-160, XP0009016143.

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