| 摘要 |
PURPOSE:To obtain a vulcanizable rubber composition having excellent heat resistance, strength characteristics, compression set, especially heat build-up by blending a partially hydrogenated unsaturated nitrile-conjugated diene-based copolymer with a sulfur-based vulcanizing agent and a specific vulcanization promoter. CONSTITUTION:(A) 100 pts.wt. a partially hydrogenated unsaturated nitrile- conjugated copolymer (e.g. isoprene-butadiene-acrylonitrile copolymer having <=20 iodine value and 5-60wt.%, preferably 10-50wt.% unsaturated nitrile amount is blended with (B) 0.1-2 pts.wt., preferably 0.5-1 pt.wt. sulfur-based vulcanizing agent (sulfur donating compound such as sulfur and tetramethylthiuram disulfide), (C) 0.1-5 pts.wt. tellurium dithiocarbamate compound of the formula (R<1> and R<2> are 1-8C lower alkyl or may form ring) and optionally another vulcanization promoter, a filler, a plasticizer, etc., to give a vulcanizable rubber composition. |
