Appeal 2007-3396
Application 1 11008,592
Horn teaches that in low-density (softer) foams it is advantageous to
use crystalline microporous molecular sieves in combination with the
amorphous microporous silica gel.2o Several zeolites are listed as
particularly suitable crystalline microporous molecular sieve^.^' One of the
zeolites recommended is faujasite, which Bayer requires as the zeolite in its
dependent claim 7.22 According to Horn, it is expedient to mix the silica gel
with the high molecular weight compound to improve the processing
properties and stability of this component of the system. 23 Horn also,
however, notes background art in which zeolites are added to both the polyol
and polyisocyanate components.24
The Skowronski patent
Skowronski relates to the preparation of insulating foams using high
equivalent weight polyester polyols to permit the use of blowing agents
other than conventional fully halogenated chlorofluorocarbons.'5 Any
hydrogen-containing blowing agent may be used although the focus is on
organic blowing agents, like hydrogen-containing halocarbons and
hydrocarbons. Water is suggested as a co-blowing agent with the hydrogen-
containing halo carbon^.^^
Skowronski notes that it is conventional to preforrnulate two
components, a polyisocyanate component and a polyol component that are to
20 Horn 11 :45-50.
21 Horn 11:51-12:15.
22 Br. 12.
23 Horn 1 1 :33-42.
24 Horn 2: 19-28.
25 Skowronski 1 :9- 15.
26 Skowronski 10: 1-3 1.
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