Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Reexamination Certificate
2007-10-02
2007-10-02
Gulakowski, Randy (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
C528S417000, C528S403000, C549S429000, C549S472000, C560S240000, C568S617000
Reexamination Certificate
active
10527583
ABSTRACT:
The present invention provides a process for preparing mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of at least one telogen and/or of a comonomer over an acidic catalyst, wherein the polymerization reactor is started up using a mixture of polytetrahydrofuran, the mono- or diesters of polytetrahydrofuran and/or of the THF copolymers, tetrahydrofuran, any comonomer and at least one carboxylic acid and/or one carboxylic anhydride.
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Gerstlauer Achim
Haubner Martin
Käshammer Stefan
Pfaff Klaus-Peter
Pinkos Rolf
BASF - Aktiengesellschaft
Connolly Bove Lodge and Hutz
Gulakowski Randy
Toscano A.
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