A chlorinated ethylene-propylene copolymer having a chlorine content of 20 to 450/0 by weight and a Mooney viscosity (ML1 +4, 100°C) of 10 to 150 is produced by chlorinating in two or three stages, by contact with chlorine gas in an aqueous suspension, an ethylene-propylene copolymer having a propylene content of 15 to 40% by weight, a melt flow indes of 0.01 to 5.0 g/10 minutes, a melting peak as measured by differential scan calorimeter (DSC) of 80°C or more, a crystallinity as measured by X-rays of 3% or more, an index MW/ MN of the distribution of molecular wieght, determined by gel permeation chromatography (GPC), of greater than 4, and a Mooney visocisty (MH1+4, 100°C) of 10 to 180.
A vulcanizable composition having superior physical properties may be obtained by formulating with (A) the chlorinated ethylene-propylene copolymer, (B) a thiourea compound, (C) a sulfur and/or sulfur donor. (D) a metal compound, and further, if necessary, (E) a dicarbamate or (F) a mercaptotriadizine compound. Further, a cross-linkable composition having superior physical properties may be obtained by formulating (A) the chlorinated ethylene-propylene copolymer with (G) an organic peroxide.
一种
氯化
乙烯-
丙烯共聚物,其
氯含量为 20 至 450/0(重量比),门尼粘度(ML1 +4,100°C)为 10 至 150(重量比),是通过在
水悬浮液中与
氯气接触,分两段或三段
氯化制得的,该
乙烯-
丙烯共聚物的
丙烯含量为 15 至 40%(重量比),熔体流动指数为 0.01 至 5.0 克/10 分钟,用差示扫描量热仪 (
DSC) 测得的熔峰为 80°C 或以上,用 X 射线测得的结晶度为 3% 或以上,用凝胶渗透色谱法 (
GPC) 测得的分子量分布指数 MW/ MN 大于 4,以及门尼粘度 (
MH1+4, 100°C) 为 10 至 180。
通过与以下物质配制,可获得具有优异物理性能的可
硫化组合物:(A)
氯化
乙烯-
丙烯共聚物,(B)
硫脲化合物,(C)
硫和/或
硫供体。(D)
金属化合物,必要时还可加入 (E) 二
氨基甲酸酯或 (F)
硫代三嗪化合物。此外,还可通过将 (A)
氯化
乙烯-
丙烯共聚物与 (G) 有机过氧化物配制成具有优异物理性质的可交联组合物。