Plastic automotive bumper

Details Plastic automotive bumper Plastic automotive bumper

B - Operations, Transporting

60

R

B60R 19/03 (2006.01) B60R 19/18 (2006.01) C08K 3/34 (2006.01) C08L 23/10 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2045724

--18-- A plastic bumper for an automotive vehicle, of the type having so-called floating ribs for the purpose of weight-lightening and preventing surface sinkage due to resin shrinkage. The bumper is formed of a composition comprising (a) propylene-ethylene block copolymer in an amount ranging from 51 to 60 weight %, the block copolymer cotaining a content soluble in xylene at ordinary temperature, ranging from 3 to 8 weight % and ethylene in an amount ranging from 3 to 8 mol %, the block copolymer having a MFR ranging from 20 to 40 g/10 min; (b) ethylene-propylene based copolymer rubber in an amount ranging from 20 to 30 weight %, the copolymer rubber having a MFR ranging from 0.1 to 2 g/10 min; and (c) talc in an amount ranging from 17 to 25 weight %, said talc having an average particle size ranging from 1.0 to 2.5 µm. Additionally, the composition has (I) a flexural elastic modulus (at 23 °C) not lower than 17000 Kg/cm2, (II) an Izod impact value (at -30 °C) not lower than 6 kg-cm/cm, (III) a coefficient of linear expansion (3 mm thickness, 45 mm length, at 23 to 80 °C) not higher than 7.0 X 10-5 (cm/cm/°C), and (IV) a MFR not lower than 7 g/10 min.

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