| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyacetal resin composition that can give a molded product having a specified viscoelasticity and being excellent in chemical resistance, or the like, by compounding a polyacetal copolymer having a structure derived by introducing oxyalkylene units into a polymer comprising repeating oxymethylene units and terminated with an alkoxyl, or the like, with an antioxidant, or the like. SOLUTION: A polyacetal copolymer (100 pts.wt.) having a number-average molecular weight of 10,000-1,000,000 and having a structure derived by introducing units of the formula into a polymer comprising repeating CH2 units and terminated with a (hydroxy)alkoxyl or formate is compounded with 0.01-5 pts.wt. at least one member selected from an antioxidant, an HCHO-reactive-N-containing polymer or compound, a formic acid binding agent, a weathering stabilizer, and a mold release to obtain a resin composition that can give an injection molding having a dynamic viscoelasticity >2.4 (in terms of a ratio of the storage modulus at -100 deg.C to the storage modulus at -50 deg.C) and a degree of crystallinity of 58-8%. In the formula, R0 and R'0 are each H or an alkyl; (n) is 1 or greater, the rate of the oxyalkylene units in which n=1 is at least 95 mol%; and (m) is 2-6. |
