Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2005-03-29
2005-03-29
Gorr, Rachel (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C528S073000, C215S233000, C215S341000, C215S352000, C215S344000, C215SDIG004, C220S378000, C206S524600
Reexamination Certificate
active
06872796
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.
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Moriga Toshinori
Tsuchida Toshihiko
Yano Noriyoshi
Yokota Hiroei
Gorr Rachel
Nippon Polyurethane Industry Co, Ltd.
Sughrue & Mion, PLLC
Toyo Seikan Kaisha Ltd.
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