Appeal No. 2006-1660
Application No. 10/609,087
contacting a sulfur source with the solution to form a
mixture;
dehydrating the mixture at a temperature greater than 100°C
such that at least a portion of the water is removed from the
mixture; and
contacting at least a dihaloaromatic compound, with the
mixture under polymerization conditions to form polyphenylene
sulfide polymers, wherein the corrosiveness of at least one of
the solution or the mixture to the metal vessel is such that the
polyphenylene sulfide polymers comprise less than 55 ppm iron,
less than 15 ppm chromium, or less than 15 ppm nickel, or any
combination thereof.
The examiner relies upon the following references in the
rejection of the appealed claims:
Campbell 3,867,356 Feb. 18, 1975
Senga 5,093,469 Mar. 3, 1992
Koyama et al. 5,856,433 Jan. 5, 1999
(Koyama)
Appellants' claimed invention is directed to a method for
preparing a polyphenylene sulfide (PPS) polymer comprising
forming a reaction product of an aqueous metal hydroxide, such
as sodium hydroxide, with a polar organic compound, such as
N-methyl-2-pyrrolidone (NMP), and dehydrating the reaction
solution without isolating the solid reaction product, an alkali
metal aminoalkanoate, from the solution. A sulfur source is
then contacted with the solution to form a mixture which is
dehydrated before contacting the mixture with a dihaloaromatic
compound under conditions to form the PPS polymer.
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