Westerman, Hattori, Daniels & Adrian, LLP
Urethane bumper spring, and method for producing same
A urethane bumper spring is produced from a urethane raw material containing a polyester-based polyol as a polyol component and diphenylmethane diisocyanate as an isocyanate component, and includes: a skin layer; and a core portion, in which the skin layer has a density (Da) and a foamed cell diameter (Ra), and the core portion has a density (Db) and a foamed cell diameter (Rb). The density (Da), the foamed cell diameter (Ra), the density (Db), and the foamed cell diameter (Rb) satisfy relationships shown in the following expressions: 1.0≤Da/Db<1.34 (1) and 0.53<Ra/Rb≤1.0 (2). Accordingly, the urethane bumper spring can achieve a cost reduction while having durability and settling resistance under high load and high deformation.
SUMITOMO RIKO COMPANY LIMITED
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Takuya Masanobu Yasuo Yorikazu
Hasegawa Mizusaki Suzuki Nakamura