Appeal No. 2004-2257
Application No. 09/841,486
and Polymer B, will not result in lowering in strength
of the ink receiving layer even under high temperature
and high humidity conditions without causing stickiness
of the surface, and further can form an ink receiving
layer exhibiting excellent ink receiving characteristic
even under low temperature and low humidity conditions,
thus revealing only the advantages of Polymer A and
Polymer B without manifestation of the drawbacks of
both polymers.
Polymer A and Polymer B . . . at least one of them
should be a hydrophilic or water-soluble polymer.
In other words, Arai, like the appellants, teaches employing the
claimed combination of thermoplastic resins to optimize, inter
alia, an ink absorbing capacity of a recording medium. Arai then
goes on to exemplify employing thermoplastic resins, including
the claimed proportion of a hydrophilic thermoplastic resin, to
improve an ink receiving layer of a recording medium. See
columns 8-11, Examples 1-6, together with column 3, line 50 to
column 4, line 41. Arai does not indicate that these
thermoplastic resins are kneaded via an intermeshing twin-screw
extruder at a shear rate of 300 sec-1 or higher. However,
according to the appellants (specification, page 2), kneading
these types of thermoplastic resins for the purpose of making an
ink receiving layer for a recording medium is admittedly known as
evidenced by JP-A-8-12871, JP-A-9-1920 and JP-A-314983.
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