| 摘要 |
PROBLEM TO BE SOLVED: To provide a new production method whereby a colorless polymerized rosin ester highly improved in its color tone is obtained without detriment to the characteristics inherent in a conventional polymerized rosin ester. SOLUTION: This method is characterized in that purified polymerized rosin (1) obtained by polymerizing purified rosin is esterified with an alcohol and the resultant ester (2) is hydrogenated.
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