Appeal No. 1998-3281
Application 08/650,500
lines 31 through 52).
Matrick discloses an aqueous ink jet composition comprising
an aqueous carrier or medium, a pigment, a nitrogen heterocyclic
diol cosolvent and a polymeric dispersant which may be used in
place of the dispersant ordinarily used to disperse the pigment
particles (column 2, line 50 through column 8, line 29). Useful
polymeric dispersants include those bearing both hydrophilic
blocks and hydrophobic blocks. The hydrophobic blocks serve to
link with the pigment particles and the hydrophilic particles
disperse the particles to which the hydrophobic block is linked
in the aqueous medium (column 8, line 31 through column 12, line
25). Other conventional additives may be incorporated into the
ink composition (column 14, line 17 through column 16, line 52).
Krüger discloses a group of polymeric dispersants known as
"comb copolymers". A line of copolymers made by Akzo Chemicals
and known as the DAPRAL line is described as commercially
available and especially suitable to disperse/stabilize polar
disperse phases in lower polarity vehicles, including inorganic
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