Nhk Spring Co., Ltd.

Tosoh Corporation

Hiroyuki Orito

Kunio Asobe

Shigeki Ichimura

Keita Ishibashi

Naoya Yoshii

Kiyoshi Ota

Yoshihisa Okiyama

Hitoshi Komatsu

Taiki Futamura

Kunikazu Takiwaki

Takaharu Matsuo

Toshiharu Sato

Provided is a foamed urethane containing a cushion material, the foamed urethane containing a hard segment and a soft segment, in which the foamed urethane is a reaction cured product formed using an isocyanate component of an MDI compound. In a first aspect, a spin-spin relaxation time (T2) of the hard segment in the foamed urethane is from 20 &#x3bc;sec to 40 &#x3bc;sec, and a volume abundance ratio of the hard segment is from 5% to 40%. In a second aspect, a foamed urethane includes: a first region in which T2 of the hard segment is from 30 &#x3bc;sec to 40 &#x3bc;sec, and a volume abundance ratio of the hard segment is from 10% to 40%, and a second region in which T2 of the hard segment is from 20 &#x3bc;sec to less than 30 &#x3bc;sec, and a volume abundance ratio of the hard segment is from 5% to 40% in a Hsolid-state pulse NMR measurement, and which is adjacent to the first region.

Cushion material, seat cushion material, and seat

Provided are: an isocyanate composition for producing a flexible foam that has good vibration absorption as a result of having a low rebound resilience rate and a low hysteresis loss rate even in a low-density area; a composition for forming a flexible foam in which the isocyanate composition is used; and a flexible foam production method in which the composition for forming a flexible foam is used. The composition for forming a flexible foam has a low hysteresis loss rate and high durability in, a high hardness range and in a low density range. The flexible foam production method uses this composition for forming a flexible foam. The flexible foam production method does not cause odor problems or the like, maintains the durability required of a flexible foam even when the density thereof is reduced, and achieves good riding comfort properties and high safety. The problem addressed by the present invention is solved by the use of at least a specific modified polyisocyanate composition, the use of a specific polyoxyalkylene polyol, and the use of a reactive amine catalyst.

Polyisocyanate composition for producing flexible polyurethane foam, and flexible polyurethane foam production method using same

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Yokohama, Japan

Hiroyuki Orito