THE CURRENT STATE OF THE RESEARCH IN THE SPHERE OF LOW-FLAMMABLE POLYURETHANE FOAMS PRODUCTION
The review presents an analysis of scientific and technical information sources on the problem of creating low-combustibility polyurethane foams. According to the results of the patent search, it was established that during 2009-2018 there was an abrupt increase in the number of granted patents. The effective flame retardants with melamine and ammonium polyphosphates, their derivatives, including the combinations with inorganic compounds were identified. It is described that at present the main direction in the development of slow-burning PPU formulations is focused on the use of phosphorus and halogen-containing reactive fire retardants, which consist of hydroxyl groups and take part in the urethane formation reaction.