Appeal No. 1997-1992 Page 2
Application No. 08/115,388
BACKGROUND
Appellants’ claimed invention relates to a method of
inhibiting polymerization during the distillation of acrylic
or methacrylic acid or ester by including an effective amount
of a polymerization inhibitor composition. The claimed
subject matter requires that the inhibitor composition
consists essentially of at least one N,N'-dinitroso
phenylenediamine compound of a specified formula and at least
one phenothiazine compound of a specified formula. Several
optionally selectable components may also be present. An
understanding of the invention can be derived from a reading
of exemplary claim 10, which is reproduced below.
10. A method for inhibiting the polymerization of an
acrylic or methacrylic acid or ester during distillation of
the acrylic or methacrylic acid or ester, which comprises
conducting the distillation in the presence of an effective
amount of a polymerization inhibitor composition consisting
essentially of:
(a) at least one N,N’-dinitroso phenylenediamine
compound
having the
structure:
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