Light rosin ester compositions and methods of making same
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United States of America Patent
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Jan 3, 2019
app pub date -
Jun 30, 2018
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Jun 30, 2018
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Abstract
A light color or a low color rosin or a rosin ester composition is disclosed. Significant color improvement can be obtained for a low color rosin, or a rosin ester by using a co-catalyst. In one embodiment, 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 In another embodiment, the co-catalyst is selected from acridone, anthrone, 9-fluorenone, thioxanthone, xanthone, derivatives and combinations thereof.
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