Toluene 2,4-Diisocyanate → Formaldehyde

Participants

Reaction Steps

41.4 parts, by weight, of an isocyanate mixture of which 40%, by weight, consists of a tolylene diisocyanate mixture (2,4- and 2,6-isomer in a ratio of 65:35) and 60%, by weight, of a polyphenyl polymethylene polyisocyanate (viscosity approximately 200 cP at 25° C). The polyphenyl polymethylene polyisocyanate was obtained by condensing aniline with formaldehyde, followed by phosgenation (NCO content 38% b.w.).

Provenance & Evidence