| 摘要 |
PURPOSE:To prepare a rubber compsn. excellent in the dispersion of a reinforcing silica filler, having a low viscosity and an improved flowability in molding, and giving a vulcanizate excellent in the mechanical strengths and heat resistance by compounding a specific acetylene compd. into the rubber compsn. CONSTITUTION:The title compsn. comprises 100 pts.wt. natural or synthetic rubber (A), 10-200 pts.wt. reinforcing silica filler (B) [e.g. a dry-process fumed silica such as Aerosil and Cab-O-Sil, and a wet-process precipitated silica made from an alkyl silicate or sodium silicate] having a specific surface area of at least 30m<2>/g, and an acetylenic alcohol or alkylene oxide adduct thereof (C) (e.g. 3-methyl-1-butyn-3-ol). The addition of the compd. C considerably improves the dispersion of the silica filler, offering a low viscosity compsn., good processability, and excellent physical properties of the vulcanizate. |
