Process for preparing cyclic polyoxymethylene

Details Process for preparing cyclic polyoxymethylene Process for preparing cyclic polyoxymethylene

C - Chemistry, Metallurgy

08

G

C08G 2/30 (2006.01) C08G 2/28 (2006.01) C08G 2/36 (2006.01)

Patent

CA 2066701

ABSTRACT Cyclic polyoxymethylene having a number-average molecular weight of 500 to 5,000 is obtained by solid state cyclization reaction of an alkalidegradative linear oxymethylene homopolymer in the presence of a medium containing a cationic catalyst. The cyclization is effected at 10 to 150 ° C for 1 to 500 minutes in an organic liquid medium. The reaction mixture obtained by the cyclization is treated with an alkaline medium to hydrolyze and remove away unreacted linear polyoxymethylene homopolymer, and isolate the cyclic polyoxymethylene. The product has a sharp molecular weight distribution and is useful as a resin improver. - 21 -

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