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Anionic addition polymers are a type of addition polymerization that occurs through anionic intermediates. The initiator for these reactions is typically a strong nucleophile, including amines, alkoxides, and organometallics. In general, the reaction starts through a Michael addition of a nucleophile onto an electron-poor alkene to form a new carbanion intermediate. The carbanion then attacks by another alkene. This process continues until the alkene monomer is consumed. Alkenes in anionic polymerizations normally have electron-withdrawing groups, perhaps carbonyls, nitriles, or nitro groups.

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