The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2005
Filed:
Oct. 15, 2001
Toshinori Moriga, Tokyo, JP;
Hiroei Yokota, Chigasaki, JP;
Toshihiko Tsuchida, Yokohama, JP;
Noriyoshi Yano, Zushi, JP;
Toshinori Moriga, Tokyo, JP;
Hiroei Yokota, Chigasaki, JP;
Toshihiko Tsuchida, Yokohama, JP;
Noriyoshi Yano, Zushi, JP;
Toyo Seikan Kaisha, Ltd., Tokyo, JP;
Nippon Polyurethane Industry Co, Ltd., Tokyo, JP;
Abstract
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.