Process for making polytetramethylene ether glycol having a...

Details Process for making polytetramethylene ether glycol having a... Process for making polytetramethylene ether glycol having a...

C - Chemistry, Metallurgy

07

C

260/634.3

C07C 41/00 (2006.01) C07C 43/10 (2006.01) C08G 65/30 (2006.01)

Patent

CA 1038408

ABSTRACT OF THE DISCLOSURE Polytetramethylene ether glycol having a narrow molecular weight distribution of about 1.30 to 1.70 is made by a process comprising (1) partially depolymerizing poly- tetramethylene ether glycol to tetrahydrofuran in the presence of a cross-linked acid form ion exchange resin at a temperature of about 120 to 150°C. while removing a major portion of the tetrahydrofuran produced, (2) cooling to about 70 to 90°C., (3) filtering to remove the resin from the polytetramethylene ether glycol, and (4) drying under reduced pressure. The narrow molecular weight polytetra- methylene ether glycol made thereby has a number average molecular weight of about 1600-3200 and a viscosity of about 4-20 poise at 40°C. It is useful in making poly- urethane fibers and films. - 1 -

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