Oxymethylene copolymer resin composition and method for producing same

An oxymethylene copolymer resin composition, which comprises:

• (i) an oxymethylene copolymer comprising an oxymethylene unit and an oxyalkylene unit containing 2 or more carbon atoms,
• (ii) a fluorine adduct of a boron compound having 1 to 3 aryl groups containing fluorine atoms, and
• (iii) a layered double hydroxide,
• wherein (ii) the fluorine adduct of the boron compound is derived from (ii′) a boron compound and (ii″) a boron trifluoride compound represented by BF3(α)m, wherein m represents 0 or 1, and α represents alkyl ether containing 2 to 20 carbon atoms, tetrahydrofuran, or phenol,
• wherein the layered double hydroxide is a hydrotalcite,
• wherein (ii″) the boron compound is at least one selected from the group consisting of tris(pentafluorophenyl)borane, bis(pentafluorophenyl)fluoroborane, pentafluorophenyldifluoroborane, tris(2,3,4,5-tetrafluorophenyl)boron, tris(2,3,4,6-tetrafluorophenyl)boron, tris(2,3,5,6-tetrafluorophenyl)boron, tris(2,3,5-trifluorophenyl)boron, tris(2,4,6-trifluorophenyl)boron, tris(2,3-difluorophenyl)boron, tris(2,3,5,6-tetrafluoro-4-methylphenyl)boron, tris(2,3,4,6-tetrafluoro-5-methylphenyl)boron, tris(2,4,5-trifluoro-6-methylphenyl)boron, tris(2,3,6-trifluoro-4-methylphenyl)boron, tris(2,4,6-trifluoro-3-methylphenyl)boron, tris(2,6-difluoro-3-methylphenyl)boron, tris(2,4-difluoro-5-methylphenyl)boron, tris(3,5-difluoro-2-methylphenyl)boron, tris(4-methoxy-2,3,5,6-tetrafluorophenyl)boron, tris(3-methoxy-2,4,5,6-tetrafluorophenyl)boron, tris(2-methoxy-3,5,6-trifluorophenyl)boron, tris(3-methoxy-2,5,6-trifluorophenyl)boron, tris(3-methoxy-2,4,6-trifluorophenyl)boron, tris(2-methoxy-3,5-difluorophenyl)boron, tris(3-methoxy-2,6-difluorophenyl)boron, tris(3-methoxy-4,6-difluorophenyl)boron, tris(2-methoxy-4,6-difluorophenyl)boron, tris(4-methoxy-2,6-difluorophenyl)boron, and hydrates thereof,
• wherein a content of (iii) the layered double hydroxide is 0.003 to 1 parts by mass, based on 100 parts by mass of (i) the oxymethylene copolymer, wherein the amount of (ii′) the boron compound is 1×10−8 mol to 1×10−5 mol, with respect to 1 mol of the oxymethylene unit, wherein the amount of (ii″) the boron trifluoride compound is 1×10−6 mol to 1×10−3 mol, with respect to 1 mol of the oxymethylene unit, wherein the molar ratio B1/B2 of the amount of boron derived from (ii′) the boron compound (B1) to the amount of boron derived from (ii″) the boron trifluoride compound (B2) is 0.0001 or more and less than 1.