| abstract |
PURPOSE: To provide a cure system for open steam curing by mixing an inorganic filler-blended chlorobutyl rubber with a vulcanizing agent consisting of an alkylphenol disulfide and a guanidine compound. n CONSTITUTION: A curable composition containing (A) chlorobutyl rubber, (B) 0.25-10 phr, preferably, 1-5 phr each of B 1 : an alkylphenol disulfide, preferably, containing 16-20% of sulfur and having a specific gravity of 1-1.42 and B 2 : a guanidine compound selected from diphenylguanidine, di-ortho-tolylguanidine, and the like, preferably, a di-ortho-tolylguanidine salt of dicatechol borate having a specific gravity of 1.2-1.25, a melting point of 165°C, and a molecular weight of 467 and, as occasion demands, (C) 2-20 phr, preferably, 3-7 phr of zinc oxide and (D) an inorganic filler, is vulcanized in the presence of steam. n COPYRIGHT: (C)1990,JPO |