Appeal 2007-2677
Application 10/622,229
The first group of particles preferably comprises particles of one or
more metal oxides such as silica, alumina, titania, and zirconia. Darsillo
4:61-66.
The second group of particles can comprise, for example, silica,
alumina, calcium carbonate, and zinc oxide. Darsillo 8:60-9:9.
A metal oxide particle that is an aggregate of smaller primary
particles, such as pyrogenic metal oxide, has a porous substructure, and
coatings that comprise such particles have a relatively rapid rate of liquid
absorption and a relatively high liquid absorption capacity. Darsillo 5:43-
47.
Furthermore, the coating retains a high porosity due to the intra-
particle voids of the aggregate particles. Darsillo 7:6-9.
The first group of metal oxide particles can be cationic. Darsillo 4:66-
5:1.
The second group of particles can also be cationic. Darsillo 8:51-59.
Metal oxides can be made cationic via surface modification. For
example, silica can be made cationic by treating the silica with one or more
inorganic cationic modifiers such as an inorganic salt (e.g., aluminum
chlorohydrate). Likewise, silica can be made cationic by treating the silica
with one or more organic cationic modifiers such as a silane or a polymer
(e.g., polyamine polymer). Darsillo 5:2-10.
It is preferred that the recording medium has a 75º specular gloss of at
least about 15%. More preferably, the recording medium has a 75º specular
gloss of at least about 25%, even more preferably at least about 35%, and
still more preferably at least about 45%, yet more preferably at least about
55%, and most preferably at least about 65%. Darsillo 3:25-31.
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