Compound, coating composition and film

A compound, which has a structure of Formula (I)

• wherein Z is
• A1 is independently C3-C12 alkylene group,
• A2 is independently C2-C12 alkylene group having at least one carboxyl group;
• A3 is independently C1-C12 alkylene group, C2-C12 divalent ether group, C4-C8 cycloalkylene group, phenylene, or
• R1 and R2 are independently hydrogen or methyl;
• n is an integer from 6 to 100;
• R3 is independently hydrogen or C1-C6 alkyl group Y1 is independently C1-C6 alkylene group;
• Y2 is independently a single bond, or C1-C6 alkylene group;
• Y3 is —O—,
• and, R4 is independently hydrogen, fluorine, methyl, or fluoromethyl.