Fluorine-containing copolymer composition and cross-linked product thereof, and compound

A fluorine-containing copolymer composition, comprising:

• a fluorine-containing copolymer;
• and
• a fluorine-containing compound having two maleimide groups of Formula (1):
• wherein
• R1 is represented by Formula (X):
• m is an integer from 0 to 8,
• where
• when m is 0, L is a fluorinated alkylene group having from 1 to 30 carbon atoms, a fluorinated cycloalkylene group having from 3 to 20 carbon atoms, or a perfluoroarylene group having from 5 to 20 carbon atoms, and
• when m is 1 or more, each L is independently an alkylene group having from 1 to 30 carbon atoms, a cycloalkylene group having from 3 to 20 carbon atoms, an arylene group having from 5 to 20 carbon atoms, a fluorinated alkylene group having from 1 to 30 carbon atoms, a fluorinated cycloalkylene group having from 3 to 20 carbon atoms, or a perfluoroarylene group having from 5 to 20 carbon atoms,
• at least one of a plurality of Ls is a fluorinated alkylene group having from 1 to 30 carbon atoms, a fluorinated cycloalkylene group having from 3 to 20 carbon atoms, or a perfluoroarylene group having from 5 to 20 carbon atoms, and
• each A is independently a single bond or —O—, and
• wherein the fluorine-containing copolymer comprises a copolymerized monomer having at least one fluorine atom and two polymerizable unsaturated groups.