Diisopropylnaphthalenes (DIPN) is a solvent used in carbonless copy paper. The oil consists of a mixture of constitutional isomers having two isopropyl groups at various locations on a naphthalene core. Some key properties are broad liquid range, low volatility, and low toxicity. DIPN is also known as Kureha Micro Capsule Oil (KMC oil)..

One component of DIPN is 2,6-diisopropylnaphthalene, which has more specialized applications.

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