FIELD: chemical or physical processes.
SUBSTANCE: invention relates to the technology of producing (poly)diaminodiphenylmethane with an increased amount of trimeric oligomers of diaminodiphenylmethane, as well as a technology for producing (poly)diphenylmethane diisocyanate (pMDI) with an increased amount of trimeric components. (Poly)diaminodiphenylmethane is characterized by an oligomeric distribution with a tetramer/trimer weight ratio of not more than 0.48 with a weight ratio of trimer/dimer of not less than 0.45 and has viscosity of 50–150 mPa⋅s at 90 °C.
EFFECT: changing the molecular weight distribution and improving the quality of the polyisocyanate by reducing the content of heavy oligomers in the polyamine, reducing the content of phenylisocyanate in the desired pMDI and simplifying the technology of its production.
19 cl, 5 tbl, 10 ex
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