| 摘要 |
<p>Oxygen-stable rosin-esters are prepared by arylsulfonic acid catalysis. More particularly, the invention provides a process for effecting rosin esterification which comprises the steps of: reacting a rosin with a primary polyhydric alcohol in at least equivalent amounts, incorporating an arylsulfonic acid in catalytic amounts either initially or subsequent to said rosin-primary polyhydric alcohol reaction and, thereafter, recovering an oxygen-stable rosin ester of good color and softening point and having an acid number below about 20. The reaction proceeds to completion in shorter time than usual and produces rosin-esters of improved oxygen-stability, color and softening point.</p> |
