Abstract: Disclosed is a polyxymethylene composite resin composition, including 40-99 parts by weight of a polyoxymethylene resin, and 1-60 parts by weight of a thermoplastic polyurethane resin containing 0.05-1 part by weight of an active isocyanate, with selective addition of 0.01-5 parts by weight of a compound containing maleic anhydride, which is advantageous in terms of generation of no carbides upon preparation thereof, excellent strength and elongation in a weld line, and superior formability. An article prepared from the polyxymethylene composite resin composition is also provided.

Abstract: A polyoxymethylene having enhanced thermal stability and resistance to depolymerization is obtained by using an alkylated melamine compound of formula (1) as a polymerization terminating agent in a polymerization of formaldehyde or a cyclic oligomer thereof and an optional comonomer in the presence of an acid catalyst: wherein, R1 to R6 are each independently H, C1-4 alkyl or CH2OR7; R7 is H, C1-4 alkyl or R8COOR9; R8 is —(CH2)n—, n being an integer of 1 to 4; and R9 is C1-4 alkyl.