| abstract |
(57) [Abstract] [Purpose] The present invention is a rubber for molds, which has excellent cold resistance and heat resistance, good kneading workability and roll workability, and excellent moldability and mold releasability. To obtain the composition. A random diene-based copolymer of at least one conjugated diene and a vinyl aromatic compound, having a molecular weight distribution MW / Mn of 10 or less, a vinyl aromatic compound bond content of 5 to 50% by weight, and A hydrogenated diene polymer in which at least 80% of the olefinic unsaturated bonds of the polymer are hydrogenated by hydrogenating a diene copolymer having a vinyl bond content of 10% or more in the diene part is a rubber component. A rubber composition for molds, which is used as. |