Definition of phthalic anhydride
: a crystalline cyclic acid anhydride C8H4O3 used especially in making alkyd resins
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“Phthalic anhydride.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phthalic%20anhydride. Accessed 16 Apr. 2021.
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The first known use of phthalic anhydride was in 1855
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