| abstract |
A colored polyacetal resin composition with improved heat stability comprisesn (A) 100 parts by weight of a polyacetal resin, (B) 0.1 to 30 parts by weight, in terms of carbon black, of a carbon black integrated with an ethylenical polymer in an amount of 0.3 to 8 times by weight that of the carbon black, (C) 0.01 to 5 parts by weight of at least one compound selected from among a nitrogen-containing compound, a fatty acid ester compound and a metal-containing compound comprising a hydroxide, an inorganic acid salt or a carboxylic acid salt of an alkali metal or an alkaline earth metal, and (D) 0.01 to 5 parts by weight of a hindered phenolic compound. n For molding purposes the composition has excellent heat stability, even when it is repeatedly used, and much reduced emission of formaldehyde vapors and occurence of mold deposits. |