Cyclohexane Dimethylene Diisocyanate

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Abbreviation: HXDI, H6XDI, H6XDI

Chemical Name: Bis(isocyanatomethyl)cyclohexane

Bis(isocyanatomethyl)cyclohexane has two isomers: 1,3-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane, i.e., meta-bis(isocyanatomethyl)cyclohexane and para-bis(isocyanatomethyl)cyclohexane. The industrial product is generally m-HXDI.

Molecular Formula: C10H14N2O2

Molecular Weight: 194.23

CAS number for 1,3-bis(isocyanatomethyl)cyclohexane (m-HXDI): 38661-72-2

CAS number for 1,4-bis(isocyanatomethyl)cyclohexane (p-HXDI): 10347-54-3

EINECS number: 233-757-2

Structural Formula

Physical and Chemical Properties

Colorless transparent liquid, freezing point -50℃, relative density (25℃) approximately 1.101, vapor pressure 53Pa/98℃, viscosity approximately 6 mPa.s, flash point 150℃, refractive index (20℃) 1.485.

Mitsui Chemicals, Inc.’s m-HXDI product is branded as TaKenate 600, with a color (APHA) below 20, purity above 99.5%, hydrolyzable chlorine below 0.1%, and NCO content of 43.3%.

Characteristics and Uses

HXDI is an alicyclic diisocyanate developed to further improve the yellowing resistance of XDI-type polyurethanes. Polyurethanes made with HXDI as the diisocyanate raw material do not yellow and have high toughness. It can be used in the manufacture of various light-resistant polyurethane coatings, elastomers, and adhesives.