Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
2005-04-12
2005-04-12
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
C528S403000, C528S299000
Reexamination Certificate
active
06878802
ABSTRACT:
In a process for preparing polytetrahydrofuran having terminal OH groups (PTHF) from the corresponding polytetramethylene ether having acyloxy end groups by transesterification with alcohols in the presence of a sodium-containing catalyst followed by passing the alcoholic PTHF solution in the presence of a catalytic amount of water directly through at least one ion exchanger to remove the sodium ions, the removal of the sodium ions is carried out in a fully continuous ion exchange unit which comprises:a plurality of ion exchange cells (Z) which are arranged on a rotary platform and are each provided with a distribution element and a collection element anda central valve (V) having a stator disk (S) and a rotor disk (R) via which the introduction and discharge of all liquid streams into or out of the ion exchange unit occurs, andfeed and discharge lines from each ion exchange cell (Z) to the central valve (V).
REFERENCES:
patent: 20040024172 (2004-02-01), Sigwart et al.
patent: 197 58 296 (1999-07-01), None
patent: 0 376 157 (1990-07-01), None
patent: 0 927 732 (1999-07-01), None
Beer Wulfrich Friedemann
Ciprian Jürgen
Menger Volkmar
BASF - Aktiengesellschaft
Boykin Terressa
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