APPEALED SUBJECT MATTER
The subject matter on appeal is directed to a vacuum heat
insulating material comprising an open cell polystyrene resin
foam core having, inter alia, a content of organic volatile
matter of less than 100 ppm. See claim 11. According to page 2,
lines 20-30, of the specification:
[T]he present inventors found that the reason why a
vacuum heat insulating material produced by packing an
open cell foam of a polystyrene resin with a gas
barrier film and evacuating the inside of the film has
a great change in its heat insulating properties with
time is that the foam contains organic volatile matters
including styrene derivatives in addition to remaining
blowing agent and this causes a great change in the
degree of vacuum in the vacuum package with time, and
has accomplished the present invention.
The specification describes methods by which a content of organic
volatile matters can be lowered to less than 100 ppm. See the
specification, pages 14, 15 and 37. The specification, at page
38, Table 2b-1, also shows that insulating polystyrene resin
foams, which have the claimed structural properties, e.g.,
densities and open cell contents, do not necessarily have the
claimed organic matter content. Further details of the appealed
subject matter are recited in representative claim 11 which is
reproduced below:
11. A vacuum heat insulating material comprising:
an open cell foam core comprising a polystyrene resin foam
2
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Last modified: November 3, 2007