To provide a radical curable composition for a wafer level lens which is excellent in optical characteristics and can form a cured article having extremely excellent form retention properties even under a high temperature environment.
The radical curable composition for the wafer level lens includes the following radical curable compound (A) as a radical curable compound. The radical curable compound (A) is a compound expressed by formula (1). (In the formula, R1 is a single bond, a methylene group in which one or two of hydrogen atoms may be substituted by a 1-5C alkyl group, a sulfonyl group, a sulfur atom or an oxygen atom; R2 and R3 are the same or different, and express each a hydrogen atom or a methyl group; X and X' are the same or different, and express each a sulfur atom or an oxygen atom; R and R' are the same or different, and express each a 1-5C alkyl group; and n and n' are the same or different, and express each 0 or 1).
FUJIKAWA TAKESHI
KISHIMOTO MAKI
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羽明 由木
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