abstract |
In the polymerized rosin compound of the present invention, the content of the rosin dimer component (A) is 80% by weight or more, and the rosin dimer component (A) is represented by the formula (1): ROOC-X-COOR (formula) Wherein, X represents a rosin dimer residue, R represents hydrogen, or an alkyl group having 1 to 5 carbon atoms or a benzyl group), and the content of the difunctional group-containing rosin dimer component (a1) is 80% by weight. the above. The content of the rosin dimer component in the above polymerized rosin compound is high, and a high molecular weight linear polymer can be formed. |