Resin composition, resin molded article, and method for producing resin molded article

A resin molded article comprising a resin composition comprising:

• a polyacetal resin;
• polyethylene;
• carbon black;
• a reaction product of an oxazoline group-containing polymer represented by formula (1);
• and
• a tertiary aromatic phosphine represented by formula (3) and/or a tertiary aromatic phosphine oxide represented by formula (4),
• wherein a content of the polyacetal resin is 50% by mass or more, and
• a sum of a content of the tertiary aromatic phosphine and a content of the tertiary aromatic phosphine oxide is 0.2% by mass or more and less than 0.5% by mass:
• wherein PM represents a polymer comprising at least any of a styrene unit, an acryl unit, or an acrylonitrile unit,
• L represents a divalent linking group having 10 or less carbon atoms and including at least one group selected from the group consisting of an alkylene group, —CO—, —O—, —NH—, and —S—,
• represents a bond to the carbon black,
• each R1 independently represents a single bond or a divalent hydrocarbon group having 5 or less carbon atoms optionally having a substituent, and
• a1 is an integer of 0 or 1 or more, and b1 is an integer of 1 or more,
• wherein R32 to R36 each independently represent a hydrogen atom or an alkyl group having 2 or less carbon atoms, and
• wherein R42 to R46 each independently represent a hydrogen atom or an alkyl group having 2 or less carbon atoms.

A method for producing a resin molded article, comprising kneading and heating a raw material, followed by molding,

• the raw material comprising:
• a polyacetal resin;
• polyethylene;
• carbon black;
• an oxazoline group-containing polymer compound represented by formula (2);
• and
• a tertiary aromatic phosphine represented by formula (3) and/or a tertiary aromatic phosphine oxide represented by formula (4),
• wherein a content of the polyacetal resin is 50% by mass or more, and
• a sum of a content of the tertiary aromatic phosphine and a content of the tertiary aromatic phosphine oxide is 0.2% by mass or more and less than 0.5% by mass, in the raw material:
• wherein PM represents a polymer including at least any of a styrene unit, an acryl unit, or an acrylonitrile unit, R1 represents a single bond or a divalent hydrocarbon group having 5 or less carbon atoms optionally having a substituent, and a2 is an integer of 1 or more,
• wherein R32 to R36 each independently represent a hydrogen atom or an alkyl group having 2 or less carbon atoms, and
• wherein R42 to R46 each independently represent a hydrogen atom or an alkyl group having 2 or less carbon atoms.