Appeal No. 1998-3281
Application 08/650,500
previously cited by the examiner are also, of record.
Ohta discloses an ink composition useful in an ink jet
apparatus for ink jet recording (column 1, line 17 through column
2, line 27). Ohta utilizes an ink jet ink which uses a pigment
rather than a dye. Ohta recognizes that because the pigments are
normally insoluble in the medium used for the ink special
techniques are required to disperse the pigments and maintain the
dispersion (column 3, lines 10 through 63). Ohta discloses that
the use of a polymeric dispersing agent having both a hydrophilic
and hydrophobic portion enable the preparation of stable
dispersions of pigments used to make ink jet ink compositions
(column 3, lines 64 through 68). Representative pigments include
carbon black (column 7, lines 23 through 28). The inks prepared
from said dispersants have numerous beneficial properties (column
7, line 56 through column 8, line 5).
Ma discloses aqueous dispersions useful as aqueous ink jet
compositions comprising water, a pigment and a polymeric
dispersant (column 2, lines 25 through 46). Useful polymeric
dispersants have both hydrophilic sections and hydrophobic
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