Low color, low sodium benzoxazinone UV absorbers and process for making same page

Low color, low sodium benzoxazinone UV absorbers and process for making same

The present invention relates to benzoxazinone compounds having a yellow index less than about 0, and a sodium concentration less than about 50 ppm. This invention also relates to a process for preparing these compounds comprising the step of reacting an isatoic anhydride with approximately stoichiometric amounts of an acylating compound, where the isatoic anhydride is purified by re-crystallization or other purification methods.

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