Appeal No. 1997-4104
Application 08/383,238
be representative of what appellants have referred to as prior
art or current PVDF resins used in maintenance-free paints
which have a melt viscosity from about 29 kPoise to about 33
kPoise. Again, see the specification at page 2, third full
paragraph.
With respect to the examiner’s contention that the manner
in which Bacque’s example 4 PVDF polymer is made is similar to
the way appellants’ PVDF polymer is made, we note the
following. Based on the disclosures in Bacque at column 1,
line 23 through line 60, it is apparent that Bacque’s example
4 is made by a prior art process of polymerizing vinylidene
fluoride monomer in an aqueous medium in the absence of an
emulsifying agent, and with the use of peroxydisulphates as
initiators, and in the absence of chain control agents. On
the other hand, as evident from appellants’ specification at
pages 4 and 5, appellants form the herein claimed
polyvinylidene fluoride polymers by an emulsion polymerization
process which employs a fluorosurfactant, i.e., an emulsifier,
with an initiator such as di-t-butyl peroxide. Accordingly,
there are substantial differences between the way appellants
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