Water → Diethylene Glycol Monobutyl Ether

Participants

Reaction Steps

A blend of 3350 and 8000 molecular weight poly(ethylene glycol) was made up to give an average molecular weight of approximately 3400 g/mole. While mixing, the poly(ethylene glycol) was dewatered under vaccum for 3 hrs.; the temperature was then stabilized at 75° C. and the reactor contents placed under a nitrogen blanket. A mixture of dodecanol and hexadecanol was added to serve as the linear cap; 1,6-hexamethylene diisocyanate was also added to the reactor and mixed for two minutes. A tin catalyst was then added and the reaction allowed to continue for 30 minutes. A diamine modifier, Kemamine D-970 (Witco Corp.), was added and allowed to react for 20 minutes. The molten polymer was then discharged to water/cosolvent solution to give a final product of 25% polymer/15% butyl Carbitol/60% water. This polymer was designated Comparative A.

Provenance & Evidence