Appeal No. 95-3425
Application 08/000,527
polymeric blend of at least one hard emulsion polymer having a
glass transition temperature greater than about 20 degrees
Centigrade and at least one soft emulsion polymer having a glass
transition temperature less than about 15 degrees Centigrade,
where the polymeric blend contains from about 20 to about 60
weight percent of the hard emulsion polymer and from about 80 to
about 40 weight percent of the soft emulsion polymer.
In the rejection of the appealed claims, the examiner relies
upon the following reference:
Padget et al. (Padget) 4,783,498 Nov. 8, 1988
Appellant’s claimed invention is directed to a method of
forming an aqueous emulsion polymer-containing paint composition
which contains no volatile organic solvent. The method entails
adding to an aqueous composition a polymeric blend of at least
one hard emulsion polymer and at least one soft emulsion polymer.
The hard emulsion polymer has a glass transition temperature
greater than about 20EC, while the soft emulsion polymer has a
glass transition temperature less than about 15EC. The organic
solvent, which is eliminated by the present invention, has the
disadvantages of an unpleasant odor as well as adverse
environmental and health effects. We are told that in addition
to avoiding the disadvantages of an organic solvent, the paint
composition produced by the claimed method exhibits excellent
coating properties, such as hardness and block resistance.
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