Patent ID: 8748561

Claim:
A dehydroabietic acid polymer, comprising a skeleton of formula (A) as a repeating unit: wherein L is selected from the group consisting of: —(CH 2 ) 3 —, —(CH 2 ) 4 —, —(CH 2 ) 10 —, —CH 2 CH 2 OCH 2 CH 2 —, —CH 2 CH 2 (OCH 2 CH 2 ) 2 —, —C 6 H 4 C(CH 3 ) 2 C 6 H 4 —, —CH 2 CH 2 OC 6 H 4 OCH 2 CH 2 —, —CH 2 CH 2 OCO-1,4-C 6 H 4 COOCH 2 CH 2 —, —CH 2 CH 2 OCO-1,3-C 6 H 4 COOCH 2 CH 2 —, —C 3 H 6 OCO-1,4-C 6 H 4 COOC 3 H 6 —, —C 4 H 8 OCO-1,4-C 6 H 4 COOC 4 H 8 — and any combination thereof.