PROCESS FOR PRODUCING CYCLIC POLYOXYMETHYLENE

摘要

A cyclic polyoxymethylene with a number-average molecular weight of 500 to 5,000 is produced by treating an alkali-decomposable linear polyoxymethylene homopolymer in an organic liquid medium containing a cationically active catalyst in solid form at 10 to 150 DEG C for 1 to 500 min to effect cyclization. The reaction mixture obtained by the cyclization is treated with an alkaline medium to remove unreacted linear polyoxymethylene homopolymer by hydrolysis, thus isolating cyclic polyoxymethylene. The product has a narrow molecular weight distribution and is useful as a resin modifier.