C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 53/02 (2006.01) B60R 19/03 (2006.01) C08L 53/00 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)
Patent
CA 2064286
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-butane copolymer having a butane content of 10 to 25% by weight and a Mooney viscosity value, (ML144, 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 (ML144, 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.
Fukui Osamu
Hamada Yukimasa
Kawamura Nobuya
Nakano Yoshifumi
Nishio Takeyoshi
Cassan Maclean
Ube Industries Ltd.
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