Process for lowering the viscosity of formose or mixtures of formose in mono- and/or di-saccharides, products produced thereby, and the use thereof in producing polyurethane resins

摘要

The invention broadly relates to greatly lowering the viscosity of the self-condensation products of formaldehyde (formose) by mixing formose with dialkyl phosphites; trialkyl phosphites and alpha -hydroxy- or alpha -amino-phosphonic acid esters. These mixtures have the surprising capacity of dissolving large quantities of crystallized sugars. Compounds capable of aminoplast formation may also be advantageously mixed in. These mixtures have the remarkable ability of being used to make flame-resistant, open-celled, highly carbonizing rigid polyurea-polyurethane foams with isocyanate indexes of as low as 45 to 50.