Hindered spiro-ketal nitroxides

Details Hindered spiro-ketal nitroxides Hindered spiro-ketal nitroxides

2006-11-07

2006-11-07

Aulakh, Charanjit S. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S016000

Reexamination Certificate

active

07132540

ABSTRACT:
The present invention discloses a series of novel hindered spiro-ketal nitroxides prepared by the ketalization reaction of 1,3-propanediols with triacetoneamine followed by oxidation. These novel spiro-ketals have unexpected advantages in hydrocarbon and monomer solubility which is important in styrene processing and refinery stream inhibition. Further, the invention shows an unexpected advantage over commercially available nitroxides in hydrocarbon solubility, especially in styrene and hydrocarbons. This invention also shows that these novel spiro-nitroxides are capable of inhibiting vinyl and acrylate polymerizations using an effective inhibition concentration of the nitroxide of the present invention.

REFERENCES:
patent: 3790525 (1974-02-01), Murayama et al.
patent: 4124564 (1978-11-01), Minagawa et al.

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