| 摘要 |
PURPOSE:To obtain a resin foam having excellent mechanical strengths and high flame retardance, by blending a polyolefin resin with magnesium hydroxide, silicone rubber and a bromine-contg. flame retarder and expanding the resulting compsn. CONSTITUTION:A resin foam is obtd. by blending 100pts.wt. polyolefin resin with 40-170pts.wt. magnesium hydroxide, 1-10wt% (based on the amount of magnesium hydroxide) silicone rubber and a bromine-contg. flame retarder and expanding the resulting compsn. It is preferred to use magnesium hydroxide in the form of a powder having an average particle size of 0.1-50mu. It is desirable that the surface of magnesium hydroxide is treated with a surfactant such as sodium stearate, because the dispersibility and flow characteristics are improved thereby. By blending the bromine-contg. flame retarder, high flame retardance can be imparted. The flame retarder is used in an amount of 10-50wt% based on that of the polyolefin resin.
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