Appeal 2007-1174
Application 11/001244
According to Appellant, the invention is directed to a cyanoacrylate
adhesive composition with enhanced peel strength, where the composition
includes a cyanoacrylate component and a toughening agent comprising
poly(vinylidene chloride-co-acrylonitrile) in combination with fumed silica
(Br. 3). Independent claims 1 and 9 are illustrative of the invention and are
reproduced below:
1. A toughened cyanoacrylate composition consisting essentially of:
a. a cyanoacrylate component; and
b. polyvinyliene-chloride-co-acrylonitrile); and
c. fumed silica, wherein the fixturing time of the cyanoacrylate
composition between two substrates is less than about 70 seconds.
9. A cyanoacrylate composition consisting essentially of:
a. a cyanoacrylate component;
b. poly(vinylidene-chloride-co-acrylonitrile);
c. fumed silica; and
d. one or more additives selected from the group consisting of
stabilizers, accelerators, plasticizers, fillers other than fumed silica,
opacifiers, thickeners, viscosity modifiers, inhibibors, thixotrophy conferring
agents other than fumed silica, dyes, thermal degradation reducers, and
combinations thereof,
wherein upon cure, the cyanoacrylate composition has an average tensile
shear strength in excess of about 1.0 N/mm.
2
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