Appeal No. 1997-4356
Application No. 08/458,628
1) a first vinylchloride polymer component
which forms a continuous phase upon gelling of the
plastisol, and
2) a cross-linked swellable second polymer
component selected from the group consisting of
homopolymers and copolymers of esters of
methacrylic acid, said second polymer component
containing from about 0.5 to about 10 moles of a
cross-linking agent per mole of said second
polymer component which upon gelling of the
plastisol is swollen but not gelled, is present as
a dispersion of discrete particles in said
continuous phase, and has a glass transition
temperature of from about -20 to about +60 /C;
b) from about 25 to about 45 percent by weight of
a phthalate plasticizer which gels only said first
polymer component at a temperature of from about 80 to
about 230/C but only swells said second polymer
component; and
c) from 0 to about 40 percent by weight of a
filler, all weights being based on the weight of said
plastisol composition.
The examiner relies upon the following reference as evidence
of obviousness:
Fukahori et al. (Fukahori) JP 58-39828 Mar. 08, 1983
Appellants' claimed invention is directed to a composition
and process for dampening the sound of automobile parts. The
composition comprises a polymer powder mixture of a first
vinylchloride polymer and a cross-linked swellable second polymer
of, for example, polymethyl methacrylate, and a phthalate
plasticizer.
2
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007