Appeal No. 1997-3544
Application No. 08/404,234
OPINION
The examiner finds that Chernega discloses a magnetic
recording medium comprising a magnetic layer provided on a
non-magnetizable substrate wherein the magnetic layer
comprises a magnetic pigment dispersed in a polymeric binder
(Answer,
page 3). The examiner further finds that the polymeric binder
of Chernega comprises a vinyl chloride copolymer having
pendant hydroxyl groups but this reference fails to disclose a
binder with nitrile and fluorine pendant groups (id.).
The examiner applies Nakamura for the teaching that vinyl
chloride copolymers are undesirable for polymeric binders in a
magnetic recording medium and should be replaced by a styrene
or acrylic copolymer (id.). The examiner finds that Nakamura
also teaches that acrylonitrile is a desirable comonomer to
yield a pendant nitrile group to increase intermolecular
forces and promote solubility with urethanes, conventionally
used as a soft resin in the binder (id.). From these
findings, the examiner concludes that it would have been
obvious to one of ordinary skill in the art to eliminate the
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