Appeal No. 96-0607
Application No. 08/134,778
polymer by free radical emulsion polymerization techniques is
an AMPS salt and the free radical process is conducted in the
presence of a diphenyl sulfonate surfactant, preferably an
alkylated diphenyloxide disulfonate (see appealed claim 8 and
the specification, page 3, last paragraph).
Daniel discloses a core/peripheral layer (i.e., shell)
latex wherein the core polymer is produced by the free radical
emulsion polymerization of at least one “co-polymerisable
unsaturated alkaline organo sulphonate” such as sodium 2-
acrylamido,
2-methylpropane sulphonate (column 1, line 67-column 2, line
21; column 2, line 66-column 3, line 8; column 3, lines 23-29;
and the answer, page 4). The conventional emulsion
polymerization is conducted in the presence of an emusifying
agent such as an alkyl-aryl sulphonate (column 3, lines 36-38
and 48-50). Daniel desires to improve the stability of the
latex emulsion product (column 1, lines 44-66; column 5, lines
34-38) for its use as a binder in the paint industry (column
5, lines 62-66).
Barnett is directed to vinyl acetate latex compositions
useful as binders in the manufacture of paints and for
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