Li ci suuf mooy defar PAPI .
PAPI (crude MDI) dañu koy defaree ci anam wi MDI bi di doxee, lu moy ni ratio bi ci bariwaayu asid hydrochlorique bi dafa gëna ndaw {0} Li PAPI ak MDI mëna def ci ñaari jéego {2} Li ci njëkk mooy aniline ak formaldehyde (formalin) ñu ngi ko boole ci benn njaxasu polyamine, polyamine composé dafa wara am reaction fosgenation ngir am PAPI. Ci synthese ci composé polyamine yi, ëmbiitu diamine bi dafay nekk lu tollu ci 50% {5} Lu gëna jege, mën nañu ko am ci yamale ratio bi ci ñaari macceeru aniline ak formaldehyde, maanaam, bariwaayu substance bi aniline ci formaldehyde mooy 1:75, lu tollu ci 50% ci diamine bi ci composé polyamine buñ defaree dafay nekk fi nekk. Ci noonu la ratios distribution de distribution de formation materiel bu ñor, ci gàttal ratio bi ci bariwaayu aniline ak formaldehyde mooy 1{13}}6 ba {13} 12} polyamine yiñ soxla ngir liggéey bi MDI ak PAPI mëna def dafa wara nekk composé polyamine bu am 60% ba 75% diamine, te caabi bi dafay am itam ci soppi ratio bi ci limu aniline yi ak macceer yiñ sarse formaldehyde ). ci composé diamine bi. Dañuy faral di jël liggéeyu boole MDI ak PAPI.