Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2008-10-20
2010-10-12
Cain, Edward J (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
Reexamination Certificate
active
07812069
ABSTRACT:
A reversible viscosity reducing polymer is provided that has a crosslinkage between subunits inclusive of a single Diels-Alder Such a reversible viscosity reducing polymer is particularly well suited as a matrix material for a heterogeneous propellant. A process for forming a reversible viscosity reducing polymer inclusive of a single Diels-Alder linkage includes reacting a native crosslinkable moiety with a crosslinker moiety having a Diels-Alder reactive moiety of a diene or dienophile to form a Diels-Alder reactive moiety capped polymer subunit. The Diels-Alder reactive moiety capped polymer subunit is then exposed to a Diels-Alder reactant inclusive of a complementary Diels-Alder reactive moiety where the reactant also includes at least one conventional crosslinkable moiety to form a crosslinkable moiety capped polymer subunit. Reaction of the crosslinkable moiety capped polymer subunit is then reacted with a conventional multifunctional crosslinking agent.
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Beyer, III Frederick L.
Costanzo Philip J.
Jensen Robert E.
Cain Edward J
Kyriakou Christos S.
The United States of America as represented by the Secretary of
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