Isophorone diamine

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Isophorone diamine
Isophorone diamine.svg
IUPAC name
Other names
Isophorondiamine; IPDA
3D model (JSmol)
ECHA InfoCard 100.018.788 Edit this at Wikidata
EC Number
  • 220-666-8
UN number 2289
  • InChI=1S/C10H22N2/c1-9(2)4-8(12)5-10(3,6-9)7-11/h8H,4-7,11-12H2,1-3H3
  • CC1(CC(CC(C1)(C)CN)N)C
Molar mass 170.300 g·mol−1
Appearance Colourless liquid
Density 0.922
Melting point 10 °C (50 °F; 283 K)
Boiling point 247 °C (477 °F; 520 K)
Very good
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
H302, H312, H314, H317, H412
P260, P261, P264, P270, P272, P273, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P333+P313, P363, P405, P501
Flash point 117°C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Isophorone diamine (usually shortened to IPDA) is a diamine with the formula (CH3)3C6H7(NH2)(CH2NH2). It is a colorless liquid. It is a precursor to polymers and coatings.[1]


It is usually produced as a mixture of the cis- and trans-isomers. It is produced by hydrocyanation of isophorone followed by reductive amination and hydrogenation of the nitrile.[1]


IPDA is used as a precursor in the manufacture of isophorone diisocyanate by phosgenation.[2]

Like other diamines or amines in general, it is a curing agent for epoxy resins. When used in coatings applications the higher cost compared to other amines is justified by the enhanced UV stability and thus lower yellowing tendency. In the production of Advanced composite materials (engineering) its higher cost compared to other amines is less critical as performance is the key criteria.[3][4] Cycloaliphatic amines such as IPDA also are known to have lower yellowing tendency than other amines and are thus used in coatings applications where this feature is important for aesthetics. Although it is not the only cycloaliphatic amine used in epoxy flooring, it has the largest use by volume.[5] Other cycloaliphatic amines used in flooring include 1,3-BAC, MXDA, PACM and DCH-99.

In laboratory tests, Tokyo Metropolitan University found that IPDA was able to remove more than 99 percent of CO2 from air with a concentration of 400 parts per million (ppm) – about the level currently in the atmosphere. This process also happened much faster than other carbon capture techniques, removing 201 millimoles of CO2 per hour, per mole of the compound. That is at least twice as fast as other Direct Air Capture lab systems, and far faster than the leading artificial leaf device.

The pollutant separated out into flakes of a solid carbamic acid material, which could be removed from the liquid relatively easily. If need be, it can be converted back into gaseous CO2 by heating it to 60 °C (140 °F), which also releases the original liquid IPDA ready for reuse. Whether the carbon is kept as a solid or a gas, it can then be stored or reused in industrial or chemical processes. The research was published in the journal ACS Environmental Au.[6]

See also[edit]


  1. ^ a b Hardo Siegel, Manfred Eggersdorfer (2005). "Ketones". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a15_077. ISBN 9783527306732.{{cite encyclopedia}}: CS1 maint: uses authors parameter (link)
  2. ^ The polyurethanes book. Randall, David, Lee, Steve, 1941-. [Everberg, Belgium]: [Huntsman Polyurethanes]. 2002. ISBN 0470850418. OCLC 50479333.{{cite book}}: CS1 maint: others (link)
  3. ^ Pilato, Louis A.; Michno, Michael J. (1994-11-04). Advanced Composite Materials. Springer Science & Business Media. ISBN 9783540575634.
  4. ^ "Cycloaliphatic Amines -". Retrieved 2018-08-17.
  5. ^ "A New Epoxy Curing Agent with Long Pot Life and Fast Cure". Retrieved 2021-05-18.
  6. ^ Kikkawa, Soichi; Amamoto, Kazushi; Fujiki, Yu; Hirayama, Jun; Kato, Gen; Miura, Hiroki; Shishido, Tetsuya; Yamazoe, Seiji (2022-05-10). "Direct Air Capture of CO 2 Using a Liquid Amine–Solid Carbamic Acid Phase-Separation System Using Diamines Bearing an Aminocyclohexyl Group". ACS Environmental Au. 2 (4): 354–362. doi:10.1021/acsenvironau.1c00065. ISSN 2694-2518. S2CID 248703204.

External links[edit]