N-Isopropyl-N′-phenyl-1,4-phenylenediamine (often abbreviated IPPD) is an organic compound commonly used as an antiozonant in rubbers.

IPPD is prone to process called blooming, where it migrates to the surface of the rubber.

[3] This can be beneficial to the tire, as ozone attacks the tire surface and blooming therefore moves the antiozonant to where it is most needed,[4] however this also increases the leaching of IPPD into the environment.

Oxidation of IPPD converts the central phenylenediamine ring into a quinone.

[6][7] It is the compound responsible for coining the term "Volkswagen Dermatitis".