Polymer, resin composition, molded article, and production method for polymer

A polymer comprising a structural unit (A) derived from ethylene, a structural unit (B) represented by Formula (1) below, and at least one kind of structural unit (C) selected from the group consisting of structural units represented by Formula (2) below and a structural unit represented by Formula (3) below,

• wherein the number of the structural unit (A) is not less than 70% but not more than 99%, and the total number of the structural unit (B) and the structural unit (C) is not less than 1% but not more than 30%, where the total number of the structural unit (A), the structural unit (B), and the structural unit (C) is 100%, and
• wherein the number of the structural unit (B) is not less than 1% but not more than 99%, and the number of the structural unit (C) is not less than 1% but not more than 99%, where the total number of the structural unit (B) and the structural unit (C) is 100%,
• where R is a hydrogen atom or a methyl group,
• L1 is —CO—O—, —O—CO—, or —O—,
• L2 is a single bond, —CH2—, —CH2—CH2—, —CH2—CH2—CH2—, —CH2—CH(OH)—CH2—, or —CH2—CH(CH2OH)—,
• L3 is a single bond, —CO—O—, —O—CO—, —O—, —CO—NH—, —NH—CO—, —CO—NH—CO—, —NH—CO—NH—, —NH—, or —N(CH3)—,
• L6 is —(CH2)n—(Rf2O)p—Rf1,
• Rf1 is a C1 to C15 alkyl group wherein one or more hydrogen atoms are substituted with one or more fluorine atoms,
• Rf2 is a C1 to C15 alkylene group wherein one or more hydrogen atoms are substituted with one or more fluorine atoms,
• n is an integer not less than 0 but not more than 10, and p is an integer not less than 0 but not more than 15,
• if p is an integer equal to or more than 2, the plurality of —(Rf2O)— may be identical with each other or different from each other,
• each of the chemical formulae listed in L1, L2, and L3 is such that the left side of the chemical formula corresponds to the upper side of Formula (1) and the right side of the chemical formula corresponds to the lower side of Formula (1),
• where R is a hydrogen atom or a methyl group,
• L1 is —CO—O—, —O—CO—, or —O—,
• L4 is a single bond or a C1 to C8 alkylene group,
• L5 is a hydrogen atom, an epoxy group, —CH(OH)—CH2OH, a carboxy group, a hydroxy group, an amino group, or a C1 to C4 alkyl amino group,
• each of the chemical formulae listed in L1 is such that the left side of the chemical formula corresponds to the upper side of Formula (2) and the right side of the chemical formula corresponds to the lower side of Formula (2), and