Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Reexamination Certificate
2007-05-25
2011-10-04
Gulakowski, Randy (Department: 1766)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
C520S001000, C422S198000, C422S218000, C422S216000, C422S179000, C422S180000, C422S141000
Reexamination Certificate
active
08030439
ABSTRACT:
The present invention relates to a process for preparing polytetrahydrofuran or tetrahydrofuran copolymers by polymerization of tetrahydrofuran in the presence of a telogen and/or a comonomer over a fixed bed of an acid catalyst, in which the temperature of the polymerization mixture increases in the direction of flow through the catalyst bed.
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Hatscher Stephan
Käshammer Stefan
Pinkos Rolf
Wabnitz Tobias
BASF SE
Connolly Bove & Lodge & Hutz LLP
Fang Shane
Gulakowski Randy
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