Pentaerythritol → rosin PE

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To a suitable reactor are introduced 500 parts of WW rosin which is then heated under nitrogen to 220° C. Thereafter, 67.5 parts of technical pentaerythritol (PE) are added. The temperature is next raised to between 270° C. and 275° C., and stirred for one hour, at which time the acid number is found to be equal to 103. A catalyst, namely, 0.25 part of p-touenesulfonic acid is then added to the reaction mixture. The reaction temperature is maintained for a total of 11 hours at 275° C. At the end of this period, esterification had been found to be substantially completed, producing a rosin/PE ester having an acid number equal to 13, an N color, and an 84° C. Ring and Ball softening point.

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