| 摘要 |
PURPOSE:The titled composition, obtained by incorporting an organopolysiloxane with a fine powdery silicon based filler, platinum (compound) and further an organosilicon compound having nitrogencontaining organic group and unsaturated group and having improved flame retardancy. CONSTITUTION:A flame-retardant silicone rubber composition obtained by incorporating (A) 100pts.wt. organopolysiloxane expressed by the average unit formula I (B is unsubstituted or substituted monofunctional hydrocarbon group; a is 1.9-2.05), preferably raw rubber, consisting of unit formula II and unit formula III, and having >=5,000 average polymerization degree with (B) 20-200 pts.wt. fine powdery silica based filler having >=50mum particle diameter, e.g. fumed silica or precipitated silica, (C) 1-200ppm, expressed in terms of the amount of platinum, platinum or a platinum based compound, e.g. chloroplatinic acid and (D) an organosilicon compound containing nitrogen-containing organic group and unsaturated group, e.g. an organosilane expressed by formula IV or V, in an amount to give 1-500 equivalents based on the amount of the platinum in the component (C), N atoms. |
