Patent ID: 7816433
Filing Date: 2010-10-19
Classification: C08K

Abstract:
1. A polyacetal resin composition comprising: (A) 100 parts by mass of polyacetal resin having a generation amount of formaldehyde of not more than 100 ppm when heated at a temperature of 200° C. for 50 minutes under nitrogen atmosphere, and (B) 0.01 to 5 parts by mass of a hydrazide compound, represented by the following formula (3): wherein R wherein the polyacetal resin (A) is a polyacetal copolymer obtained through a heat treatment of unstable terminal groups as defined by the following: the polyacetal copolymer is subjected to heat treatment in a molten state at a temperature in the range of from the melting point of said polyacetal copolymer to 260° C. in the presence of at least one quaternary ammonium compound represented by the formula (1) below: wherein each of R wherein P represents the amount (ppm by mass) of the quaternary ammonium compound, based on the total mass of the polyacetal copolymer and the quaternary ammonium compound, 14 is the atomic weight of nitrogen, and Q represents the molecular weight of the quaternary ammonium compound.