Complex halogen-free solid flame retardant composition, process for its preparation and polymer molding compositions and their use

摘要

Complex halogen-free solid flame retardant composition for polymer molding compositions consisting of 30 to 70 wt .-% porous, low-melting glass particles from a high temperature extruded borosilicate glass foam having an average particle size of 1.5 to 12 .mu.m 30 to 70 wt .-% melamine and - 2 to 10 wt .-% ammonium nitrate, which by-dry mixing of the porous glass particles of a borosilicate glass foam and the melamine uniform distribution of 2-10 wt .-% ammonium nitrate dissolved in distilled water, in the mixture of the glass particles and the Melamine further mixing the components porous glass particles, melamine and dissolved ammonium nitrate temperature treatment of the mixture at 90 to 120 ° C for 90 to 240 minutes.