PROCESS FOR PREPARING FOAMING POLYMERIC MATERIAL Russian patent published in 1995 - IPC

FIELD: processes for the preparation of a polymeric material. SUBSTANCE: the process for preparing a foaming polymeric material comprises dissolving 100 wt parts of paraform (formaldehyde) in 200 wt parts of a 0.5% NaOH solution under stirring to 40-60 C for 30-40 minutes. 110-140 wt parts of dicyanodiamide are then added under continuous stirring and the dicyanodiamide are then added under continuous stirring and the mixture is kept for 40-60 minutes. 90-130 wt parts of xylite backflow are then poured and the whole mixture is heated for another 100-120 minutes. 40-100 wt parts of orthophosphoric acid are added and the process is continued under stirring for 50-70 minutes. The resulting product is thereafter dried at 120-150 C for 6-8 hr. EFFECT: improved proper ties of the polymeric material. 2 tbl