Appeal No. 2004-2275
Application No. 09/444,968
invention encompasses a composition from a two-step reaction. First is the
formation of an intermediate prepolymer (polyurethane) and a
subsequent step wherein the prepolymer is reacted with hydroxy
group-containing film forming polymer. We do not agree.
It is well known by persons of ordinary skill in the art that diols,
polyisocyanates and polyurethanes have different reactive groups. These
reactive groups can under go various reactions to form other compounds
with different reactive groups. As stated by Appellants, “[t]he hydroxyl
groups of the diol and the isocyanate groups of the polyisocyanate can
undergo an addition reaction to form urethane groups. A polyurethane
resin thus prepared no longer comprises the starting compounds, i.e., the
diol as a compound with hydroxyl groups and the polyisocyanate having
isocyanate groups, but a polymer having urethane groups.” (Brief, p. 7).
Appellants’ invention is directed to a coating composition
comprising hydroxy group-containing film forming polymer, a
polyisocyanate compound, and a diol. The present invention may also
comprise a polyurethane. (Specification, p. 4). However, the composition
must contain a diol and a polyisocyanate and an hydroxy
group-containing film forming polymer as specified in the claimed
-4-
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007