Appeal No. 94-3726
Application 07/978,531
of a
solid biocide (brief, page 2). Claims 1 and 11 are
illustrative of the subject matter on appeal and are
reproduced below:
1. A process for preparing a storage stable dispersion
of a solid biocide which comprises the steps of:
(a) forming a biocide/carrier concentrate
containing 1 to 70 percent biocide by mixing a solid biocide
and a liquid carrier until a desired particle size for said
biocide is obtained;
(b) heating said mixture of biocide concentrate and
a heat swellable polymer to an elevated temperature of between
about 50EC and about 120EC to cause said polymer to swell by
carrier absorption into said polymer, thereby providing a
swelled polymer plus biocide mixture in said carrier
characterized by an increased viscosity sufficient to provide
a hot dispersion; and
(c) cooling said hot dispersion under continuous
stirring to a temperature of between about -20EC and about
40EC to provide a storage-stable dispersion having a viscosity
of between about 2,000 and about 30,000 centipoise.
11. The storage-stable composition produced by the
process of claim 1.
The examine relies upon the following references as
evidence of obviousness:
Tirpak et al. (Tirpak) 3,911,135 Oct. 7,
1975
Rei et al. (Rei '080) 4,683,080 Jul. 28,
2
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