Patent ID: 7772310

Claim:
A process for producing a polyacetal resin composition comprising a step of simultaneously melt-kneading: (I) a polyacetal resin; and per 100 parts by weight thereof, (II) more than 5 parts by weight but less than 100 parts by weight of calcium carbonate which has an average particle diameter of from 0.1 μm to less than 1.5 μm and an average aspect ratio (L/D) which is a ratio of average major axis (L) of particles to average minor axis (D) of particles of 3 or less and which is not surface-treated with a saturated fatty acid, unsaturated fatty acid and metal salt thereof having 8 to 32 carbon atoms; and (III) 0.005 to 10 parts by weight of an organic acid, at melting point of the polyacetal resin (I) or higher.