Patent ID: 7675059

Claim:
A copolymer comprising a repeat unit (A) and a repeat unit (B), represented by the following formula (1): wherein, R is a substituted or unsubstituted alky group of about 1 to about 12 carbon atoms, and the substituted alkyl group includes F or Cl, R′ is represented by the following formula (2), the sum of m and n is about 1, m is a real number from about 0.1 to about 0.9, and n is a real number from about 0.1 to about 0.9, the sum of x and y is about 1, x is a real number from about 0.1 to about 0.9, and y is a real number from about 0.1 to about 0.9, and a and b are amounts (mol %) of repeat units (A) and (B) in the copolymer, respectively, a is about 10 mol % to about 90 mol %, and b is about 90 mol % to about 10 mol %: wherein, R 1 is one or more selected from the group consisting of functional groups represented by the following formula (3), R 2 is one or more photoreactive functional groups selected from the group consisting of the following formula (4), and k is an integer from about 0 to about 3, wherein m is an integer from about 1 to about 12