Diisobutylene (DIB)

Di-isobutylene, or DIB, is a liquid mixture containing two isomers, 2,4,4-trimethyl-pentene-1 and 2,4,4-trimethyl-pentene-2 (sometimes referred to as DIB-1 and DIB-2).

Total isomer purity is critical in various applications where the presence of other isomers and codimers can have a detrimental impact on performance.

Janex supplies DIB in bulk parcels and isotanks. 

Used as a chemical intermediate, DIB has applications in many industries including rubber chemicals, lubricant additives and coatings.


Diisobutylene CAS  25167-70-8 / EC 246-690-9


There are different routes to produce DIB:

  1. reacting high purity isobutylene over a solid acid catalyst;
  2. reacting Raffinate 1 with sulfuric acid which selectively condenses the isobutylene content to DIB; and
  3. using an acidic ion-exchange resin to make the same condensation as when using Raffinate 1

Main applications:

  • 3,5,5-trimethylhexanol
  • bis(2,4,4-trimethylpentyl) phosphinic acid
  • Iso-nonanoic acid
  • Neononanoic acids
  • Octenyl succinic anhydride
  • Octylated diphenylamine
  • Octylphenol (for resin and surfactant use)
  • Perfumery
  • Photographic chemicals
  • Sulfurised DIB
  • Tert-octylamine
  • Water-soluble polymers


Contact us for more information.