Patent ID: 8188211

Claim:
An oxymethylene polymer which is a homopolymer or copolymer in which the molar ratio of comonomer units to oxymethylene units is less than 0.008 and which has an at least bimodal molecular weight distribution, wherein the proportion of low molecular weight oxymethylene polymers having molecular weights below 10,000 Dalton is from 1 to 5% by weight, based on the total mass of the oxymethylene polymer, the oxymethylene polymer being formed by a process wherein an oxymethylene polymer haying a proportion of low molecular weight oxymethylene polymers having molecular weights below 10,000 Dalton of more than 5% by weight, based on the total mass of the oxymethylene polymers, is converted by fractional precipitation into an oxymethylene polymer having a proportion of low molecular weight oxymethylene polymers of less than 5% by weight.