Curable composition

A curable composition comprising a silicone copolymer, a fluoropolyether group-containing compound, and a matrix-forming composition, wherein

• the silicone copolymer has two or more crosslinkable groups;
• the crosslinkable group is a group containing a carbon-carbon double bond, a carbon-carbon triple bond, a cyclic ether group, a hydroxyl group, a thiol group, an amino group, an azide group, a nitrogen-containing heterocyclic group, an isocyanate group, a halogen atom, a phosphoric acid-containing group, or a silane coupling group, or a precursor group thereof,
• wherein the silicone copolymer is a silicone copolymer represented by the following formula (1) or (2):
• wherein
• R1 is a hydrogen atom or a C1-6 alkyl group;
• R2 is each independently at each occurrence a hydrogen atom or a C1-6 alkyl group;
• m is an integer of 1 to 300;
• R4 is each independently at each occurrence R4a or R4b;
• In R4n, the number of R4a is two or more;
• R4a is each independently at each occurrence a divalent organic group having a crosslinkable group;
• R4b is each independently at each occurrence a divalent organic group not having a crosslinkable group;
• the crosslinkable group is:
• a group containing a carbon-carbon double bond, a carbon-carbon triple bond, a cyclic ether group, a hydroxyl group, a thiol group, an amino group, an azide group, a nitrogen-containing heterocyclic group, an isocyanate group, a halogen atom, a phosphoric acid-containing group, or a silane coupling group;
• or a group containing a precursor group thereof;
• n is an integer of 2 to 90;
• Xa is each independently a divalent organic group;
• Xb is each independently a divalent organic group;
• Ra is each independently an alkyl, phenyl, —SRa1, —ORa2, —NRa3 2,
• Ra1, Ra2, Ra3, Ra4, Ra5, and Ra6 are each independently an alkyl group or a phenyl group;
• and
• Ra7 is a hydrogen atom or a halogen atom.