Polymethylenepolyphenyl isocyanate

Isocyanates. The most common isocyanates encountered in polyurethane propellants are 2,4-tolylene diisocyanate, TDI, and hexamethyl-ene diisocyanate, HDI. 3-Nitrazapentane diisocyanate has also been used in high density propellants. In some polyurethane liners Adiprene L (duPont), a NCO-terminated condensation product of poly (1,4-oxybutyl-ene)diol and TDI is used, as well as some of the more highly functional isocyanates, such as polymethylenepolyphenyl isocyanate (Papi, Carwin Chemical Co.). 

POLY(IMINO(l-OXO-l,6-HEXANEDIYL)) see PJY500 POLYMALEIC ACID see PJY850 POLYMERS of EPICHLOROHYDRIN and 2,2-BIS(4-HYDROXYPHENYL)PIPERAZINE see ECM500 POLYMERS, WATER-INSOLUBLE see PKA850 POLYMERS, WATER-SOLUBLE see PKA860 POLYMETHYLENEPOLYPHENYL ISOCYANATE see PKBIOO... 

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