Process for the production of polyethers derived from oxetanes

Details Process for the production of polyethers derived from oxetanes Process for the production of polyethers derived from oxetanes

C - Chemistry, Metallurgy

08

G

C08G 65/28 (2006.01) C08G 65/18 (2006.01) C08G 65/22 (2006.01)

Patent

CA 2056388

This invention relates to the production of hydroxy-terminated prepolymers suitable for use in curing reactions with isocya- nates to produce elastomers. The process involves the continuous addition over periods of 12-50 hours of an oxetane monomer to a reaction mixture consisting of a diol initiator and a catalyst capable of catalysing the cationic quasi-living cationic polymerisa- tion of the monomer, the rate of addition being such that the catalyst is always in stoichiometric excess over the monomer. Termi- nation of polymerisation is effected by the addition of brine. Under these conditions, polymers of increased molecular weight and reduced impurity levels are produced.

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