| 摘要 |
PURPOSE:To reduce the loss of the weight of thermally expandable graphite even at a high temp. of >=220 deg.C and to make the graphite useful as a flame retardant for thermoplastic resins by coating the graphite with a compd. of an alkaline earth metal and a film forming resin. CONSTITUTION:Thermally expandable graphite of 20-150 mesh, preferably 30-100 mesh grain size is coated with a compd. of an alkaline earth metal such as CaCO3 or a metal hydroxide such as Al(OH)3 and a film forming resinous substance such as an acrylonitrile-butadiene copolymer having 15-50wt.% acrylonitrile content to obtain thermally expandable graphite hardly causing the loss of the weight even at a high temp. of about >=220 deg.C. The amt. of the metal compd. used is 0.1-50wt.% and that of the resinous substance is 0.01-5wt.%. |
