Removal of residual ethylene oxide from poly(ethylene oxide)

Details Removal of residual ethylene oxide from poly(ethylene oxide) Removal of residual ethylene oxide from poly(ethylene oxide)

1991-05-21

1993-06-01

Kight, III, John

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

Synthetic resins

Treating polymer containing material or treating a solid...

528403, 528408, 528409, 528411, 528416, 528480, 528500, 528502, 522 71, 522 72, 522 74, 522 77, 522 86, 522149, 522903, 524493, 524495, 524497, C08F 600, C08G 5900

Patent

active

052161226

ABSTRACT:
Residual ethylene oxide is removed from poly(ethylene oxide) by the steps of adding to particles of high molecular weight poly(ethylene oxide) a finely divided solid particulate material which is capable of coating the poly(ethylene oxide) particles and impeding their agglomeration under conditions of heating, heating the particles of poly(ethylene oxide) at a temperature of at least 40.degree. C. and preferably which is near their crystalline melting point, and maintaining the temperature for a sufficient time to reduce the ethylene oxide in the particles of poly(ethylene oxide) to ten ppm or less. In one embodiment, the poly(ethylene oxide) is heated by holding the particles in a heated enclosure; in another, it is heated as a slurry in a liquid medium; in yet another, it is heated by warm gas in a gaseously-fluidized bed; and in a fourth, it is heated by microwave radiation.

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Matthews, Gibson, and Samuel, "Enhancement of the Kinetics of the Aeration of Ethylene Oxide Sterilized Polymers Using Microwave Radiation", Journal of Biomedical Materials Research, vol. 23, pp. 143-156 (1989).
Alloum, Labiad, and Villemin, "Application of Microwave Heating Techniques for Dry Organic Reactions", Journal Chemical Society, Chemical Communication, pp. 386-387, (1989).
Research Disclosure, 29561, "Rf Heating to Dry Polymers", Nov. 1988.
Article, N. P. Vasilakos and F. Magathaes, "Microwave Drying of Polymers", Journal of Microwave Power, vol. 19(2), 1984.
Computer Print out Search, "Removal of Ethylene Oxide from Polyethylene Oxide Using Microwave Energy", Feb. 26, 1989.
Computer Print Out Search, "Removal of Ethylene Oxide from Polyethylene Oxide Using Microwave Energy", Aug. 16, 1990, Update of Feb. 26, 1989.

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