申请人:UBE INDUSTRIES, LTD.
公开号:EP0509662A1
公开(公告)日:1992-10-21
A resin composition for an automobile bumper comprising components (A), (B), and (C) described below:
(A) 45 to 74% by weight of a crystalline ethylene-propylene block copolymer having (a) a flexural modulus of 15,000 kg/cm² or more, (b) an ethylene content of 5 to 20% by weight, (c) an intrinsic viscosity (decalin, 135°C) of a portion soluble in p-xylene at room temperature of 3 or more, (d) a melt flow index (MI) of 21 to 70 g/10 min., and (e) a content of a portion insoluble in boiling n-heptane of 97% by weight or more;
(B) 21 to 35% by weight of elastomer selected from the group consisting of components (I), (II) and (III) and having a weight ratio of (I) : [(I) + (II) + (III)] of from 0.5 to 1.0, (a) said component (1) being an amorphous ethylene-butene copolymer having a butene content of 10 to 25% by weight and a Mooney viscosity value, (ML₁₊₄, 100°C) of 5 to 20, (b) said component (II) being an amorphous ethylene-propylene copolymer having an ethylene content of 70 to 90% by weight and a Mooney viscosity value (ML₁₊₄, 100°C) of 5 to 40, and (c) said component (III) being a hydrogenated block copolymer consisting of 10 to 40% by weight of an aromatic vinyl polymer block X and 60 to 90% by weight of a conjugate diene polymer block Y, having a structure of said block components being X - Y or X - (Y - X)n, wherein n is 1 or 2, 90 mol% or more of said block Y being hydrogenated and the melt flow index (MI) of the hydrogenated block copolymer being 5 g/10 min. (230°C, 2.16 kg) or more, and;
(C) 5 to 10% by weight of talc having a combustion loss of 7% by weight or less, containing no particles having a diameter of 10 µm or more and having an average particle diameter D₅₀ of 1.0 to 3.0 µm.
一种用于汽车保险杠的树脂组合物,由下述组分 (A)、(B) 和 (C) 组成:
(A) 45%至 74%(按重量计)的结晶乙烯-丙烯嵌段共聚物,其(a)弯曲模量为 15,000 公斤/平方厘米或以上,(b)乙烯含量为 5%至 20%(按重量计),(c)可溶于对二甲苯的部分在室温下的固有粘度(癸醛,135°C)为 3 或以上,(d)熔体流动指数(MI)为 21 至 70 克/10 分钟,(e)不溶于沸腾正庚烷的部分含量为 97%(按重量计)、(e) 不溶于沸腾的正庚烷的部分的含量为 97%或以上(按重量计);
(B) 21-35%(重量)的弹性体,选自组分(I)、(II)和(III)组成的组,其重量比为(I):(I):[(I)+(II)+(III)]的重量比为 0.5 至 1.0, (a) 所述组分(1)为无定形乙烯-丁烯共聚物,其丁烯含量为 10-25%(重量比),门尼粘度值(ML₁₊₄, 100°C) 为 5-20、(b) 所述组分(II)为无定形乙烯-丙烯共聚物,其乙烯含量为 70%至 90%(按 重量计),门尼粘度值(ML₁₊₄,100°C)为 5 至 40、(c) 所述组分(III)为氢化嵌段共聚物,由 10%至 40%(按重量计)的芳香乙烯聚合物嵌段 X 和 60%至 90%(按重量计)的共轭二烯聚合物嵌段 Y 组成,所述嵌段组分的结构为 X - Y 或 X - (Y - X)n,其中 n 为 1 或 2,90 摩尔%或更多的所述嵌段 Y 被氢化,氢化嵌段共聚物的熔体流动指数 (MI) 为 5 克/10 分钟(230°C,2.16 千克)。(230°C, 2.16 kg)或以上,以及
(C) 5%至 10%(按重量计)的滑石粉,其燃烧损失为 7%(按重量计)或更 少,不含直径为 10 微米或更大的颗粒,且平均颗粒直径 D₅₀ 为 1.0 至 3.0 微米。