Appeal 2007-2677
Application 10/622,229
Desirably, the recording medium is calendered to provide a glossier
coating. Darsillo 3:23-25.
5. Bi
Bi discloses a recording sheet comprising a two-layer coating. The
bottom, or first, layer comprises amorphous silica and the top, or second,
layer comprises spherical silica. Bi at [0008].
Bi discloses a method of preparing an ink jet recording sheet
comprising:
(a) providing a substrate;
(b) forming the first layer on the substrate by (1) providing amorphous
SiO2, (2) adding the amorphous SiO2 to a cationic-inducing compound to
form a dispersion, (3) mixing the dispersion with a binder to form a mixture,
and (4) coating the mixture on the substrate; and
(c) forming the second layer on the first layer by (1) providing
spherical silica, (2) mixing the spherical silica with either little or no binder,
and (3) coating the spherical silica on the first layer. Bi at [0009-0012].
Both silica layers are rendered cationic with a cationic-inducing
compound. Bi at [0008].
The cationic-inducing compound is selected from the group consisting
of hydroxyl-containing polyvalent metal salts and cationic resins. Bi at
[0028].
An example of a hydroxyl-containing polyvalent metal salt is
aluminum chlorohydrate, a cationic modifying agent. Such polyvalent metal
salts have been described in Alexander. Bi at [0028].
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