Dimethyl diphenylmethane diisocyanate

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Abbreviation: DMMDI

Molecular formula: C₁₇H₁₄N₂O₂

Chemical name: 3,3′-Dimethyl-4,4′-diphenylmethane diisocyanate

Molecular weight: 278.31

CAS number: 139-25-3

Structural formula:

White solid, melting point 97–98°C, boiling point (400 Pa) 200–203°C, density 1.14.

Characteristics and Uses

Due to the steric hindrance effect of the ortho-methyl groups, its reactivity is lower than that of MDI. It can be used in polyurethane elastomers.