Automobile bumper formed of thermoplastic multicomponent resin

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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524505, 525 89, 525 98, C08L 5302, C08K 334

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active

047375361

ABSTRACT:
Disclosed is an automobile bumper which is formed of a thermoplastic multicomponent resin composition and which is improved in weatherability and impact resistance at low temperatures and also in surface glossiness. Essentially the resin composition is a blend of 22-28 wt % of a hydrogenated block copolymer of an aromatic vinyl compound such as styrene and a conjugated diene such as butadiene, 32-56 wt % of a propylene-ethylene block copolymer in which the content of ethylene is 1-10 wt % and 22-28 wt % of an ethylene-propylene copolymer rubber. Optionally, up to 5 wt % of talc and/or up to 7 wt % of low-pressure low-density polyethylene may be added. Some physical properties of the ingredients are specified such that the resin composition has a melt index not lower than 5 g/10 min at 230.degree. C. under load of 2.16 kg and a modulus of elasticity in bending in the range from 2000 to 4000 kg/cm.sup.2.

REFERENCES:
patent: 4371602 (1983-02-01), Tone et al.
patent: 4412016 (1983-10-01), Fukui et al.

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