Appeal 2007-0404
Application 10/684,611
(3) Park teaches that the continuous foam sheet product is aged for a
period of time “to allow for diffusion of the blowing agent and air
through the cell walls to bring it to equilibrium” (col. 8, ll. 20-23);
(4) Park teaches formation of a multilayer foam sheet where the foam
sheet comprises at least one layer of the polypropylene foam sheet
and at least one functional layer to act as a water vapor or gas
barrier to extend the shelf life (col. 8, ll. 44-57);
(5) Park teaches that the multilayer foam sheet is produced by
preparing the foam mixture as before, supplying the foam mixture
and a separately plasticated functional resin to the multimanifold
die of an extruder, and co-extruding the two resins into a
continuous multilayered foam sheet (col. 9, ll. 15-28);
(6) Park teaches that the blowing agent may be nitrogen, carbon
dioxide, and other inert gases, and this agent dissolves in the
polymer under high pressure and temperature, creating bubbles to
form the foam (col. 10, ll. 30-53);
(7) Hayes discloses copolyesters that have utility as barriers to
moisture, oxygen, carbon dioxide, and the like, useful in
packaging of foodstuffs (col. 8, ll. 6-8; col. 11, ll. 9-12);
(8) Hayes teaches producing biodegradable shaped foamed articles
from his copolyesters, providing the foaming action in the polymer
melt by injection of an inert gas such as nitrogen or carbon dioxide
(col. 15, ll. 32-61); and
5
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