Appeal 2007-1392
Application 10/640,895
polyol(s), blowing agent, surfactants, catalysts and other
components except for polyisocyanates, and then contact this
mixture with the polyisocyanate. Alternatively, all
components can be introduced individually to the mixing zone
where the polyisocyanate and polyol(s) are contacted. It is
also possible to prereact all or a portion of the polyol(s), in the
absence of water, with the polyisocyanate to form a
prepolymer, although such is not preferred. (Smits, col. 6, ll.
21-38).
The Examiner finds that the Imperial Chemical reference, Example 2
(Table 4), describes the claimed invention (Answer 3).
The Imperial Chemical reference discloses that “[t]he ‘A side’ of the
system contained the polyisocyanate while the ‘B side’ of the systems
contained all other ingredients. The B side components were prepared by
mixing all of the [other] components together at room temperature in a high
speed mixer” (Imperial Chemical 12).
The Imperial Chemical reference, Table 4, discloses the isopentane is
present in a weight fraction that is greater than the weight fraction of the n-
pentane.
The Examiner further relies on Soukup for describing that it was
known to manufacture polyisocyanurate insulation foams wherein stream A
comprises the isocyanate compound and stream B comprises a premixed
polyol and a blowing agent blend (Answer 4; Soukup, cols. 9-10).
Appellant acknowledges that certain elements of the present claims
read on the blowing agent mixtures in the comparative examples of both
Smits and Imperial Chemical (Br. 5).
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