Appeal No. 2000-1156
Application No. 08/578,706
it is critical to employ a cross-linked copolymer obtained by
precipitation polymerization of specific monomer mixtures,
including specific cross-linkers, in the presence of a saturated
nonionic surface-active compound. Further details of the
appealed subject matter are provided in representative claim 7
which reads as follows:
7. A process for stabilizing an oil-in-water emulsion
which process comprises adding to the emulsion from 0.01 to
5% by weight of the emulsion of a crosslinked copolymer
obtained by precipitation polymerization of a monomer
mixture comprising:
(a) monoethylenically unsaturated C3-C8-carboxylic acids,
their anhydrides or mixtures of the carboxylic acids
and anhydrides,
(b) compounds with at least 2 non-conjugated ethylenic
double bonds in the molecule as crosslinkers and,
optionally,
(c) other monoethylenically unsaturated monomers which are
copolymerizable with monomers (a) and (b), in the
presence of free-radical polymerization initiators and
from 0.1 to 20% by weight, based on the total weight of
the monomers of a saturated, nonionic surface-active
compound.
The prior art references relied upon by the examiner are:
Sehm 4,419,502 Dec. 6, 1983
Denzinger et al. (Denzinger) 4,525,581 Jun. 25, 1985
Arraudeau et al. (Arraudeau) 4,871,536 Oct. 3, 1989
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