Appeal No. 2000-0487 Page 2
Application No. 08/913,380
three listed reactant components. Appellants state that “claims
11-15 stand or fall together.” Accordingly, we select claim 11
as the representative claim on which we shall decide this appeal.
Claim 11 is reproduced below.
11. Water-soluble nonionic polyurethanes useful as
protective colloids for the polymerization of olefinically
unsaturated monomer in aqueous medium wherein said water-soluble
nonionic polyurethanes consist essentially of the reaction
products of;
a) organic polyisocyanates with
b) water-soluble polyalklene glycols containing at least 70%
by weight of ethylene glycol groups and with
c) polyhydric branched alcohols containing at least three
hydroxyl groups per molecule, and wherein, the equivalent ratio
of b) to c) is in the range from 1:0.01 to 1:10 and the
equivalent ratio of [b) + (c]to a) is in the range from 1:0.6 to
1:0.85.
The sole prior art reference of record relied upon by the
examiner is:
Georgoudis et al. (Georgoudis) 3,660,010 May 02, 1972
Claims 11-15 stand rejected under 35 U.S.C. § 102 as
anticipated by or, in the alternative, under 35 U.S.C. § 103 as
being unpatentable over Georgoudis.
We refer to the brief and reply brief and to the answer for
a complete exposition of the opposing viewpoints expressed by
appellants and the examiner concerning the issues before us on
this appeal.
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