Patent ID: 7638565

Claim:
A polyacetal resin composition which comprises a polyacetal resin, an antioxidant, a processing stabilizer, a heat stabilizer and an aliphatic carboxylic acid hydrazide represented by the following formula (1): X—(R—C(═O)—NHNH 2 ) n (1) wherein X represents a hetero atom or a hetero atom-containing group having n-valence(s), R represents an alkylene group and n denotes an integer of 1 to 4; wherein the antioxidant comprises at least one member selected from the group consisting of a hindered phenol compound and a hindered amine compound, and wherein the processing stabilizer comprises at least one member selected from the group consisting of a higher fatty acid or a derivative thereof, a polyoxyalkylene glycol, and a silicone compound, and wherein the heat stabilizer comprises at least one member selected from the group consisting of a basic nitrogen-containing compound, a phosphine compound, a metal salt of an organic carboxylic acid, an alkali or alkaline earth metal compound, a hydrotalcite, and a zeolite, wherein the basic nitrogen-containing compound is at least one member selected from the group consisting of an aminotriazine compound, a guanidine compound, a urea compound, an amino acid compound, an amino alcohol compound, an imide compound, an amide compound, and a hydrazine compound different from tile carboxylic acid hydrazide represented by the formula (1).