Sealing gasket for closure and process for production of closure using the same,申请号US20010976011-传众专利搜索

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

申请公布号：US6872796(B2)

申请号：US20010976011

申请日期：2001.10.15

申请公布日期：2005.03.29

申请人：

TOYO SEIKAN KAISHA, LTD.;NIPPON POLYURETHANE INDUSTRY CO, LTD.

发明人：MORIGA TOSHINORI;YOKOTA HIROEI;TSUCHIDA TOSHIHIKO;YANO NORIYOSHI

分类号：B65D53/00;B65D53/06;C08G18/66;C08G18/75;C09K3/10;(IPC1-7):C08G18/79

主分类号：B65D53/00

摘要：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.