| 摘要 |
PURPOSE:A rubber composition suitable for ink tubes, etc., having improved processing properties, long scorching time, stability, shorted vulcanization time and improved physical properties of vulcanized material obtained by blending raw material rubber with a scorch preventing agent and calcium stearate. CONSTITUTION:(A) 100pts.wt. raw material rubber comprising isobutylene- isoprene rubber having 350,000-450,000 viscosity-average molecular weight or obtained by blending the isobutylene-isoprene rubber with ethylene propylene rubber having 25,000-100,000 number-average molecular weight is blended with (B) a vulcanizing agent and a vulcanizing accelerator and (C) 0.2-5pts., preferably 0.2-3pts.wt. calcium stearate. |
