Appeal 2007-1001
Application 10/602,197
(a) providing a first crystalline thermoplastic polymer;
(b) extruding the first crystalline thermoplastic polymer and forming
the first crystalline thermoplastic polymer into a flexible substrate layer
having an interface surface;
(c) providing a second polymer comprising a polymer consisting
essentially of a syndiotactic propylene polymer having a melt flow index of
less than 2 grams/10 minutes produced by the polymerization of propylene
in the presence of a syndiospecific metallocene catalyst effective to form a
surface layer, the surface layer capable of producing a heat seal with itself at
a seal temperature less than 110ēC;
(d) extruding the syndiotactic propylene polymer to form a surface
layer; and
(e) bonding the surface layer to the interface surface of the substrate
layer to form a multilayer film having a surface of syndiotactic propylene
polymer which has a thickness that is less than the thickness of the substrate
layer.
The Examiner relies upon the following references as evidence of
obviousness:
Bothe US 5,254,394 Oct. 19, 1993
Peet US 6,387,529 B1 May 14, 2002
Appellants' claimed invention is directed to a process for producing a
multilayer film having a substrate layer and a surface layer wherein the
surface layer comprises a polymer consisting essentially of a syndiotactic
propylene polymer having a melt flow index of less than 2 grams/10
minutes.
Appealed claims 21-26 stand rejected under 35 U.S.C. § 103(a) as
being unpatentable over Bothe in view of Peet.
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