Polymer, Coating Composition Comprising Same, and Organic Light Emitting Element Using Same

A polymer comprising a unit represented by the following Formula 1:

• in Formula 1,
• L1 to L5 are the same as or different from each other, and are each independently a direct bond;
• —O—;
• a substituted or unsubstituted alkylene group;
• a substituted or unsubstituted arylene group;
• a substituted or unsubstituted divalent amine group;
• or a substituted or unsubstituted heteroarylene group,
• b1 is an integer from 1 to 10,
• when b1 is 2 or more, two or more L1's are the same as or different from each other,
• Ar1 to Ar3 are the same as or different from each other, and are each independently a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted aryloxy group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heterocyclic group,
• R1 to R5 are the same as or different from each other, and are each independently hydrogen;
• deuterium;
• a halogen group;
• a hydroxyl group;
• a nitrile group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heterocyclic group,
• r4 and r5 are the same as or different from each other, and each independently an integer from 1 to 3,
• when r4 and r5 are each 2 or more, two or more R4's and R5's are each the same as or different from each other, and
• m1 is a repeating number of the unit, and an integer from 1 to 10,000.