Nippon Polyurethane Industry Co., Ltd.

Toyo Seikan Kaisha, Ltd.

Hiroei Yokota

Osamu Takata

Noriyoshi Yano

Toshinori Moriga

Toshihiko Tsuchida

Sumito Nii

A sealing gasket for closure, made of a polyurethane elastomer obtained by reacting the following (A) and (B): (A) a polyisocyanate component having an isocyanate group content of 5 to 38% by weight and average 2 to 3 functional groups, obtained by modifying an aliphatic isocyanate and/or an alicyclic isocyanate, and (B) a polyol component having a hydroxyl value of 20 to 350 mgKOH/g and average 2 to 3 functional groups; and a process for producing a closure using such a sealing gasket. The closure sealing gasket made of a polyurethane elastomer, obtained by the present invention, when used for a closure (e.g. a metal closure of food container), causes no yellowing by ultraviolet light, has a strength at least equal to those of sealing gaskets produced from an aromatic isocyanate.

Sealing gasket for closure and process for production of closure using the same

Composition for production of cover packing and process for production of cover packing using the same

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Chigasaki, Japan

Hiroei Yokota