Appeal 2007-2234
Application 09/950,477
A. Appellants' Specification
[1] Applying silica sol compositions to paper product surfaces as anti-
skid compositions to reduce sliding is known (Specification, 1:16-17).
[2] Appellants' invention relates to a method of coating a cellulosic
material with a specific anti-skid composition, i.e., substantially latex-
free anti-skid composition comprising an aluminate modified silica sol
and an organic additive (id., 2:1-8).
[3] Cellulosic material is defined as "any virgin or recycled paper or
paperboard material such as linerboard, corrugated board, or liquid
board" (id., 2:14-17).
[4] A "substantially latex-free composition" is a composition containing
"only trace amounts of latex, which may be present . . . up to about
1000 ppm, but in most cases up to about 100 ppm" (id., 2:18-21).
[5] The aluminate modified silica sol may be prepared as described by
Iler at pages 407-408 (id., 3:13-15).
[6] An organic additive, such as alcohols, e.g., glycerine or diethylene
glycol, is primarily added to the composition to enhance the
cleanability of the paper machinery (id., 3:22-34).
B. Miranda
[7] Miranda describes a method of enhancing the anti-skid properties of a
paper product by coating the paper product with an aqueous
composition comprising (a) a colloidal silica, (b) a latex and (c) an
alcohol, as well as both the products produced thereby and the
aqueous composition (Miranda 4:1 to 5:28; 14:4-8).
[8] Useful silica colloids include the aluminate-modified silicas described
by Iler, which Miranda incorporates by reference (id., 9:16-20).
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