In coatings, maleic anhydride serves as a film-forming component for water-based, oil-based, and synthetic resin coatings (e.g., alkyd, polyester, maleic anhydride-modified rosin, and tung oil-maleic acid resins).
Pesticides.Malathion (synthesized from maleic anhydride and P205) is a low-toxicity, high-efficiency non-systemic insecticide (low toxicity to mammals), widely used in agriculture and horticulture. Maleic hydrazide acts as a growth regulator for tobacco and a sprout inhibitor for potatoes. Maleic anhydride is also used to produce fungicides (e.g., captan) and herbicides (e.g., endothal).

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