Appeal No. 96-0607
Application No. 08/134,778
increasing latex and paint stability (abstract; column 4,
lines 5-8 and
43-60). Barnett teaches that, by conducting the emulsion
polymerization in the presence of an anionic surfactant and an
ionic monomer, the particle size of the latex can be modified
to yield small particle size latex which improves the
stability of the latex emulsion (column 2, line 61-column 3,
line 2; column 4, lines 5-8 and 20-37). The anionic
surfactant includes alkyl benzene sulfonate or alkyl
diphenyloxide disulfonate (column 3, lines 40-41; see the
answer, page 4). The ionic comonomer includes the sodium salt
of AMPS and Barnett teaches this comonomer as the most4
preferred (column 3, lines 54-64; column 8, lines 14-16, lines
38-40; claim 11). Barnett teaches that the concepts of this
invention are applicable to emulsion polymerization of vinyl
acetate and other monomers capable of ethylene addition
polymerization (column 3, lines 3-10).
4Appellants’ “sodium salt of 2-acrylamido-2-methylpropane
sulfonic acid” and the “sodium acrylamido-2-methylpropane
sulfonate” of Daniel and Barnett are apparently different ways
of naming the same comonomer.
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