Appeal 2006-2516
Application 10/191,449
INTRODUCTION
The claims are directed to a peel treating agent. According to
Appellants, the presence of bisurea in a peel treating agent can decrease the
adhesive force when the peel-treating agent containing the bisurea is coated
on the back side of a tape opposed to the adhesive agent. Moreover, higher
contents of bisurea can disrupt the process of preparing such a product by
creating undesirably high amounts of precipitate in the storage tank of the
process, particularly if the temperature of the storage tank is lowered.
Appellants maintain that they have discovered that by adjusting the particle
size of the ethylene/vinyl alcohol copolymer or polyvinyl alcohol to be at
most 10 mesh, the resulting product peel treating agent contains at most 3
wt% of bisurea, thus providing a superior final product.
Claim 10 is illustrative of the invention and is reproduced below:
10. A peel-treating agent comprising a reaction product of an
aliphatic isocyanate having an aliphatic group of at least 8 carbon
number with an ethylene/vinyl alcohol copolymer or polyvinyl
alcohol, as an effective component, wherein a bisurea form content in
the reaction product is at most 3 wt%, wherein the ethylene/vinyl
alcohol copolymer or polyvinyl alcohol has a particle size no larger
than particles that would pass through a sieve of size 10 mesh.
The Examiner relies on the following prior art references to show
unpatentability:
Halpern US 3,052,652 Sep. 4, 1962
Kumagai JP 55-142096 Nov. 6, 1980
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