MAGNESIUM OXIDE POWDER, VULCANIZING AGENT COMPOSITION FOR RUBBER, RUBBER COMPOSITION, AND PRODUCTION METHOD FOR MAGNESIUM OXIDE POWDER

Abstract: there is provided a magnesium oxide powder, where dis 10 �m or less, dbeing a particle size at which a cumulative size based on a volume-based cumulative particle size distribution curve by sieving test is 50%, a ratio d/dis 10 or less, dand dbeing particle sizes at which cumulative sizes based on the volume-based cumulative particle size distribution curve by sieving test are 90% and 10%, respectively, and a citric acid activity is in a range of 500 seconds or more and 2,500 seconds or less.

Inventor(s): Masamichi Nakagawa, Isamu Fujikawa, Takashi Hamaoka, Takeshi Himoto, Seiji Yamaguchi, Kunio Watanabe

CPC Classification: C01F5/08 (COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} ; salts of oxyacids of halogens ; peroxides, salts of peroxyacids ; sulfides or polysulfides of magnesium, calcium, strontium, or barium ; thiosulfates, dithionites, polythionates ; compounds containing selenium or tellurium ; binary compounds of nitrogen with metals ; azides ; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals ; amides or imides of silicon }; metal {imides or} amides , {}; nitrites ; {compounds of noble gases }; phosphides ; salts of oxyacids of phosphorus ; carbides ; compounds containing silicon ; compounds containing boron ; compounds having molecular sieve properties but not having base-exchange properties ; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, ; cyanides ; salts of cyanic acid ; salts of cyanamide ; thiocyanates ; {double sulfates of magnesium with sodium or potassium ; with other alkali metals , }))

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