Appeal No. 2002-0184 -3-
Application No. 09/058,537
17. A mixture of thermoplastic PFA fluoropolymer having high temperature stability
comprising
A) A low molecular weight fluoropolymer consisting essentially of units of
tetrafluoroethylene and from 0.5 to 10 mol % of units of one or more perfluoro
alkyl vinyl ethers having from 1 to 4 carbon atoms in the perfluoroalkyl radical, and
optionally up to 5 mol % of a third monomer not containing hydrogen, the low
molecular weight monomer having a melt flow index of $ 30 g/10 min., and
B) A high molecular weight fluoropolymer consisting essentially of units of
tetrafluoroethylene and from 0.5 to 10 mol % of units of one or more perfluoro
alkyl vinyl ethers having from 1 to 4 carbon atoms in the perfluoroalkyl radical, and
optionally up to 5 mol % of a third monomer not containing hydrogen, the high
molecular weight monomer having a melt flow index of # 15 g/10 min.,
wherein the ratio of the melt flow index of the low molecular weight fluoropolymer
to the melt flow index of the high molecular weight fluoropolymer is in the range of from
80 to 2500, and wherein the low molecular weight fluoropolymer is at least 10% by
weight of the mixture and not more than 90% by weight of the mixture.
THE REFERENCES OF RECORD
As evidence of anticipation and obviousness, the examiner relies upon the following
references:
Nakagawa et al. (Nakagawa) 4,552,925 Nov. 12, 1985
Ishiwari et al. (EP’868) 0 362868 B1 Apr. 11, 1990
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