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    • 9. 发明公开
    • Sealing gasket for closure and process for production of closure using the same
    • 用于密封的封闭件,和用于生产封闭件的方法具有这样的密封件
    • EP1199324A1
    • 2002-04-24
    • EP01308831.5
    • 2001-10-17
    • TOYO SEIKAN KAISHA LIMITEDNIPPON POLYURETHANE INDUSTRY CO. LTD.
    • Moriga, ToshinoriYokota, HiroeiTsuchida, ToshihikoYano, Noriyoshi
    • C08G18/79C08G18/73C08G18/75B65D53/06C09K3/10
    • B65D53/06C08G18/6607C08G2190/00C09K3/1021Y10S215/04
    • 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), resists yellowing by ultraviolet light, has a strength at least equal to those of sealing gaskets produced from an aromatic isocyanate and, moreover, excellent rubber properties, is low in dissolution in liquid foods contained in the food container, and promises sufficient sealability.
      The process for producing a closure according to the present invention is high in productivity and can use the production facilities for other materials such as polyvinyl chloride resin and the like.
    • 为闭合的密封垫圈,由通过使下述(A)得到的聚氨酯弹性体和(B)的:(A),其具有在5%至38%的异氰酸酯基团含量(重量)和平均2至3个官能团的多异氰酸酯组分, 通过修改在脂族异氰酸和/或脂环处的异氰酸酯,和(B)的多元醇组分具有20至350毫克KOH / g的羟基值和平均2至3个官能团获得的; 以及使用搜索的密封垫圈的封闭的方法。 由聚氨酯弹性体的闭合密封垫圈,由本发明中,当为封闭用于获得(例如食品容器的金属封闭件),通过紫外光抵抗黄变,具有强度至少等于那些从制造密封垫片的 芳香族异氰酸酯,并且更过来,优异的橡胶性能,是在包含在所述食品容器液体食品溶解低,并承诺充密封性。 用于制造封闭gemäß到本发明的方法是在高生产率,并且可以使用所述生产设施的其它材料:如聚氯乙烯树脂等。