Polymer, coating composition comprising same, and organic light emitting device using same

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

• wherein, in Chemical Formula 1,
• L1 is a direct bond;
• a substituted or unsubstituted phenylene group;
• a substituted or unsubstituted naphthylene group;
• a substituted or unsubstituted biphenylene group;
• a substituted or unsubstituted divalent fluorenyl group;
• or a substituted or unsubstituted divalent carbazolyl group;
• l1 is an integer of 1 to 10;
• Ar1 and Ar2 are the same as or different from each other, and each independently a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heteroaryl group;
• R1 to R8 are the same as or different from each other, and each independently hydrogen;
• deuterium;
• a halogen group;
• a hydroxyl group;
• a cyano group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heteroaryl group;
• r4, r6 and r8 are each independently an integer of 1 to 4;
• r5 and r7 are each independently an integer of 1 to 3;
• when r4 is 2 or greater, the two or more R4s are the same as or different from each other;
• when r5 is 2 or greater, the two or more R5s are the same as or different from each other;
• when r6 is 2 or greater, the two or more R6s are the same as or different from each other;
• when r7 is 2 or greater, the two or more R7s are the same as or different from each other;
• when r8 is 2 or greater, the two or more R8s are the same as or different from each other;
• when l1 is 2 or greater, the two or more L1s are the same as or different from each other;
• and
• n is, as a repetition number of the unit, an integer of 1 to 10,000.