| abstract |
The invention relates to a process for the chemical recovery of wastes resulting from diaminodiphenylmethane preparation, by the conversion thereof into aminic polyols as intermediates for the preparation of rigid polyurethane foams, to be applied inthe heat insulations industry. There takes place a reaction of polyoxyalkylation of the mixture of polyaminic products resulting as waste, by additioning the same with alkyleneoxides, in the presence of a slightly stearically hindered fatty amine. |