Patent ID: 8053091

Claim:
A hyperbranched polymer represented by Formula I below: wherein, Ar 1 is an unsubstituted C 6 -C 20 arylene group or a group represented by —(R 1 )—N(R 2 )—R 3 — where R 1 and R 3 are each independently a substituted or unsubstituted C 6 -C 20 arylene group, and R 2 is a substituted or unsubstituted C 6 -C 20 aryl group; X 1 and X 2 are each independently a divalent linking group selected from the group consisting of O, S, CH 2 , CO, SO 2 , and NHCO; Y 1 is CO, SO 2 , or PO 3 ; Y 2 is CO 2 H, SO 3 H, or POSH; and n is an integer of 2 to 10,000.