Core material for automobile bumpers
AssigneesJapan Styrene Paper Corporation, Nissan Motor Co., Ltd.
InventorsAkira Adachi, Takashi Kubota, Yukio Okada, Kenichi Miyazaki, Taro Hagiwara
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Abstract
A core material for automobile bumpers which is composed of a molded article of foamed particles of a polypropylene-type resin. The molded article has a density of 0.015 to 0.045 g/cm.sup.3 and a compression stress at 50% compression of at least 1 kg/cm.sup.2. The core material simultaneously has excellent energy absorbing property and dimensional recovery and a low density.
Claims3
In an automobile bumper which is composed of a core material and a surface covering material, the improvement wherein said core material is composed of a molded article of foamed particles of a homopolymer of propylene or a copolymer of propylene with 1 to 30% by weight of an ethylenically unsaturated monomer copolymerizable with it, said molded article having a density of 0.015 to 0.045 g/cm.sup.3 and a compression stress at 50% compression of at least 1 kg/cm.sup.2, and the said surface covering material is a synthetic resin.
Dependencies are inferred from the claim text.