Appeal No. 2003-1912
Serial No. 09/436,440
The claims relate to a thermoplastic elastomer having A
blocks and B blocks; wherein linking groups are present and are
derived from at least one diisocyanate for end-capping the
blocks, and at least one difunctional oligomer having two
functional groups which are reactive with the isocyanate moieties
of the diisocyanate.
Claim 1, which is one of two independent claims, is
representative of the subject matter encompassed by the claims on
appeal:
1. A thermoplastic elastomer having A blocks and B blocks
and being present in a solid state suitable for use as a binder
for at least one of a propellant, explosive, and gasifier, the
thermoplastic elastomer being formulated from a composition
comprising, as constituents:
A blocks terminated with isocyanate-reactive groups derived
from monomers comprising at least one member selected from the
group consisting of oxetane derivatives and tetrahydrofuran
derivatives, the A blocks being crystalline below about 60oC;
B blocks terminated with isocyanate-reactive groups derived
from monomers comprising at least one member selected from the
group consisting of oxetane and derivatives thereof,
tetrahydrofuran and derivatives thereof, and oxirane and
derivatives thereof, the B blocks being amorphous above about
-20oC; and
linking groups derived from at least one diisoyanate for
end-capping the A blocks and the B blocks and at least one
difunctional oligomer comprising two functional groups which are
reactive with isocyanate moieties of the diisocyanate.
2
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