An active energy ray curable composition including a polymerization initiator and a polymerizable compound is provided. When the active energy ray curable composition is formed into a cured film on a substrate under the specific condition, the cured film satisfies the following conditions (1) and (2): (1) when the substrate is a polyethylene terephthalate substrate, the cured film on the substrate has a transmission density of from 1.5 to 3.0 that is measured with a transmission densitometer, and (2) when the substrate is a polycarbonate substrate, the cured film on the substrate has a first length (L1) and a second length (L2) before and after a specific tensile test, respectively, and a ratio of L2/L1 ranges from 1.5 to 4.0.

An active energy ray curable composition including a polymerization initiator and a polymerizable compound is provided. When the active energy ray curable composition is formed into a cured film on a substrate under the specific condition, the cured film satisfies the following conditions (1) and (2): (1) when the substrate is a polyethylene terephthalate substrate, the cured film on the substrate has a transmission density of from 1.5 to 3.0 that is measured with a transmission densitometer, and (2) when the substrate is a polycarbonate substrate, the cured film on the substrate has a first length (L1) and a second length (L2) before and after a specific tensile test, respectively, and a ratio of L2/L1 ranges from 1.5 to 4.0.

The present invention relates to a method of storage and/or transport of an ethylenically unsaturated compound, wherein the ethylenically unsaturated compound is protected against unwanted free-radical polymerization with a phenol.

The present invention relates to a method of storage and/or transport of an ethylenically unsaturated compound, wherein the ethylenically unsaturated compound is protected against unwanted free-radical polymerization with a phenol.