Appeal No. 1998-0119 Page 2
Application No. 08/466,171
THE INVENTION
The invention is directed to a method of making a polymer film having a core layer
of high density polyethylene. A lower coextensive surface layer comprising a polymer is
compounded with particulate crosslinked hydrocarbyl-substituted polysiloxane and silicone
oil. The silicone oil is present in an amount effective to reduce the coefficient of friction.
The silicone oil spreads to the exposed upper skin layer upon contact. The lower surface
layer contains an olefinic polymer selected from ethylene-propylene-butene-1 terpolymer,
ethylene-propylene random copolymer, ethylene-propylene block copolymer, isotactic
polypropylene, low density polyethylene, very low density polyethylene, linear low density
polyethylene, and medium density polyethylene. The upper surface layer may include any
of the aforementioned olefinic polymers or may contain polyvinylidene chloride, polyvinyl
alcohol or an acrylic polymer.
THE CLAIM
Claim 18 is illustrative of appellants’ invention and is reproduced below.
18. A method of making a film which comprises:
(1) providing an upper major surface of a core layer (b) comprising a high density
polyethylene with a coextensive water-based coating receiving layer (a) formed from a
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