Modified oxymethylene polymers

Modified oxymethylene polymers, which comprise a linear polymer of oxymethylene repeat units, blocked at one end by at least one terminating group selected from the group consisting of an alkylene oxide as an adduct to an alcohol residue, represented by the following formula (1):

• and an alkylene oxide as an adduct to a carboxylic acid residue, represented by the following formula (2):
• where in the formulae (1) and (2) R1 and R1′ are independently selected from the group consisting of hydrogen, an alkyl group, a substituted alkyl group, an aryl group and a substituted aryl group;
• R2 is selected from the group of an alkyl group, a substituted alkyl group, an aryl group and a substituted aryl group;
• m is an integer selected from 2-6 and n is an integer selected from 1-1,000, (a) the linear polymer excluding the terminal group having a number average molecular weight of 10,000-500,000 and (b) the modified oxymethylene polymers having a molecular weight distribution (Mw/Mn) of not more than 2.5.