Polymerizable composition, film, and half mirror for displaying projection image

A polymerizable composition, comprising:

• a polymerizable liquid crystal compound represented by Formula (I);
• and
• an oxime compound,
• in the formula, A1 and A2 each independently represent a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent,
• L1 and L2 each independently represent a single bond or a linking group selected from the group consisting of —CH2O—, —OCH2—, —(CH2)2OC(═O)—, —C(═O)O(CH2)2—, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═CH—C(═O)O—, and —OC(═O)—CH═CH—,
• Sp1 and Sp2 each independently represent a single bond or a linking group selected from the group consisting of a linear alkylene group or a branched alkylene group having 1 to 20 carbon atoms, and a group in which one or two or more —CH2-'s in the linear alkylene group or the branched alkylene group having 1 to 20 carbon atoms are substituted with —O—, —S—, —NH—, —N(CH3)—, —C(═O)—, —OC(═O)—, or —C(═O)O—,
• Q1 and Q2 each independently represent a hydrogen atom or a polymerizable group selected from the group consisting of groups represented by Formula Q-1 to Formula Q-5 and at least one of Q1 and Q2 represents a polymerizable group,
• m and n each independently represent an integer of 0 to 2, when m represents 2, two A1's may be identical to each other or different from each other, and two L1's may be identical to each other or different from each other, and when n represents 2, two A2, s may be identical to each other or different from each other, and two L2's may be identical to each other or different from each other,
• X may represent a group represented by —X3—Sp3-Q3 or two X's may be bonded to each other to form a fused ring with a benzene ring of a phenylene group to which two X's are bonded, wherein the fused ring is selected from the group consisting of naphthalene, chroman, isochroman, indoline, isoindoline, chromene, xanthene, phenoxathiin, thianthrene, quinoline, isoquinoline, phthalazine, quinoxaline, 1,3-benzodithiol-2-ylidene, and 1,3-benzothiazol-2-yl, and the fused ring may have a substituent,
• X3 represents a single bond, or a linking group selected from the group consisting of —O—, —C(═O), and —C(═O)O—,
• Sp3 represents a single bond or a linking group selected from the group consisting of a linear alkylene group or a branched alkylene group having 1 to 20 carbon atoms, and a group in which one or two or more —CH2-'s in the linear alkylene group or the branched alkylene group having 1 to 20 carbon atoms are substituted with —O—, —S—, —NH—, —N(CH3)—, —C(═O)—, —OC(═O)—, or —C(═O)O—,
• Q3 represents a hydrogen atom or any polymerizable group selected from the group consisting of a cycloalkyl group, a group in which one or two or more —CH2-'s in the cycloalkyl group are substituted with —O—, —S—, —NH—, —N(CH3)—, —C(═O)—, —OC(═O)—, or —C(═O)O—, and groups represented by Formula Q-1 to Formula Q-5, and
• l represents an integer of 0 to 4, and when l represents 2 to 4, 1 X's may be identical to each other or different from each other.