Reducing molecular weight polydispersity of polyether glycols by

Details Reducing molecular weight polydispersity of polyether glycols by Reducing molecular weight polydispersity of polyether glycols by

1994-02-22

1995-07-18

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568617, C07C 4311, C07C 4318

Patent

active

054343151

ABSTRACT:
Polyether glycols, especially poly(tetramethylene ether) glycols, having a narrow molecular weight distribution (e.g., Mw/Mn=1.2 to 1.80), are made by a process which consists of separating the low molecular weight fraction in an ultrafiltration module. In these units, molten PTMEG is fed at temperatures in the range of 30.degree. to 150.degree. C. and pressures ranging between 25 and 1500 psi. The PTMEG retentate from the ultrafiltration unit is also characterized by water content <25 ppm and low to negligible concentration of oligomeric cyclic ethers.

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