Appeal No. 2005-0528 Page 3
Application No. 10/178,143
6. A process for preparing a low density water-blown rigid polyurethane foam
comprising reacting:
(1) a polyol composition comprising:
1.) at least 30% by weight, based on the total weight of the polyol
composition, of at least one aromatic amine-initiated polyether polyol; and
2.) at least one of the following:
(I) up to 50% by weight, based on the total weight of the polyol
composition of a polyether polyol having a functionality greater
than or equal to 2.5 which is different from the polyether polyol of
1.);
and
(ii) up to 70% by weight, based on the total weight of the polyol
composition, of a polyester polyol;
with
(2) at least one isocyanate;
in the presence of
(3) optionally, at least one catalyst;
(4) water; and
(5) optionally, at least one additive or auxiliary agent
wherein the low density water-blown rigid polyurethane foam produced has a closed cell content
of at least 80%.
11. A foam produced by the process of Claim 6.
Claims 6-15 stand rejected under 35 U.S.C. § 103(a) as being unpatentable over U.S.
Patent 5,840,781 issued to Dietrich et al. on November 24, 1998 (Dietrich). Appellants state that
the claims stand or fall together (Brief, p. 3). We select claim 6 to represent the issues on appeal.
We affirm for the following reasons.
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