Appeal No. 96-2710
Application No. 08/164,598
slip agents, although the specific liquid hydrocarbyl
substituted polysiloxane is not specifically suggested.
While Kawakami does not specifically disclose the
specific silicone oil slip agent of the claimed subject
matter, Balloni(‘671) teaches a polypropylene polymer
packaging film, having a coating of silicone oil on the film
to lower the coefficient of friction and provide hot slip
properties. Our analysis is in agreement with the examiner’s.
The examiner has correctly pointed out that the addition of
the claimed silicone oil slip agent into the polypropylene
packaging film of Balloni results in improved running
properties and heat seal characteristics. Accordingly, we
concur with the examiner that it would have been prima facie
obvious for one of ordinary skill in the art to select the
silicone oil taught by Balloni(‘671) as a suitable slip agent
in the propylene polymer packaging film composition of
Kawakami.
It is well settled that it is a matter of obviousness for
one of ordinary skill in the art to combine two or more
materials when each is taught by the prior art to be useful
for the same purpose. In re Kerkhoven, 626 F.2d 846, 850, 205
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