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Title:
URETHANE BUMPER SPRING, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2015/146435
Kind Code:
A1
Abstract:
Provided is a urethane bumper spring consisting of a urethane raw material that contains a polyester-based polyol as a polyol component and a diphenylmethane diisocyanate as an isocyanate component, wherein the density (Da) and foam cell diameter (Ra) of a skin layer of the urethane bumper spring and the density (Db) and foam cell diameter (Rb) of a core portion of the urethane bumper spring satisfy the relationships shown in formulae (1) and (2). Therefore, the present invention is capable of reducing costs while achieving settling resistance and durability against high loads and large deformations. 1.0 ≤ Da/Db < 1.34 ……(1) 0.53 < Ra/Rb ≤ 1.0 ……(2)

Inventors:
SUZUKI YASUO (JP)
HASEGAWA TAKUYA (JP)
NAKAMURA YORIKAZU (JP)
MIZUSAKI MASANOBU (JP)
Application Number:
PCT/JP2015/055327
Publication Date:
October 01, 2015
Filing Date:
February 25, 2015
Export Citation:
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Assignee:
SUMITOMO RIKO CO LTD (JP)
International Classes:
F16F9/58; B29C39/02; B29C39/24; C08G18/42; F16F1/37; B29K75/00; B29K105/04; B29L31/00
Foreign References:
JP2004293697A2004-10-21
JP2006056132A2006-03-02
JPH09302059A1997-11-25
Other References:
See also references of EP 3124825A4
Attorney, Agent or Firm:
SAITOH Yukihiko et al. (JP)
Masahiko Nishifuji (JP)
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