Preparation of polytetrahydrofuran with terminal hydroxyl groups

Details Preparation of polytetrahydrofuran with terminal hydroxyl groups Preparation of polytetrahydrofuran with terminal hydroxyl groups

1998-12-28

2000-03-14

Truong, Duc

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

521 26, 528403, 528482, 528495, C08J 520, C08F 608

Patent

active

060373814

ABSTRACT:
The invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols in the presence of a sodium-containing catalyst. In this process the polytetrahydrofuiran solution is passed in the presence of a catalytic amount of water directly through at least one ion exchanger following the transesterification in order to remove the sodium cations.
The novel process makes it possible to remove the sodium cations from the sodium-containing catalyst in an economic manner and with little complexity. The residual sodium content can be reduced to values of less than 0.5 ppm.

REFERENCES:
patent: 4985551 (1991-01-01), Perry et al.
patent: 5410093 (1995-04-01), Dorai

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