Light color rosin ester compositions and methods of making same
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United States of America Patent
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Sep 7, 2021
Grant Date -
Jul 16, 2020
app pub date -
Apr 1, 2020
filing date -
Jun 30, 2017
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Abstract
The disclosure relates to a light color or a low color rosin or a rosin ester composition. The rosin ester comprises a reaction product of one or more rosins, one or more polyhydric alcohols, and optionally one or more monocarboxylic acids, and optionally one or more polycarboxylic acids having from 2 to 54 carbon atoms; from 0 ppm to 200 ppm of a co-catalyst, and optionally, a disproportionation catalyst, an esterification catalyst, or combinations thereof. The co-catalyst has a triplet formation quantum yield (ϕT) of greater than 0.5 and a triplet lifetime (τT) of greater than 0.5 microseconds. Methods to prepare the rosin ester compositions and uses of the compositions are also disclosed.
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