| abstract |
(57) [Summary] [Structure] In a polymer composed of repeating oxymethylene units, one oxymethylene unit is one oxymethylene unit. A polyoxymethylene gear having a structure in which 0.07 to 0.5 mol is inserted per 100 mol, and the terminal group of the polymer is an alkoxy group, a hydroalkoxy group or a formate group. [Effect] A gear having excellent durability in an atmosphere in contact with hot water, steam or a basic solution can be obtained. |