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EP0163251A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Laminated rubber stopper

Assignee: Daikyo Gomu Seiko KK
•
Filing: 1985-05-22
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Granted: —
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Expires: 2005-05-22
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Abstract

Abstract A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of a vessel, wherein at least a leg portion is laminated with film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10% by mole based on the total number of mole of tetrafluoroethylene and ethylene, which has improved fitting with an opening of a vessel and sealing properties and can be produced with low failure rate.

Inventors

  • 👤 Kiyohiko Ihara
  • 👤 Tsuneo Nakagawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 12:02
CPC Classifications
B; B65; B65D; B65D51/00; B65D51/002; B65D39/00; B65D39/0005; B65D39/0029; C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/265; B65D2539/00; B65D2539/001; B65D2539/008

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 91 words
A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of an vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10 % by mole based on the total number of mole of tetrafluoroethylene and ethylene.
Claim 2
Dependent Claim 91 words
A laminated rubber stopper comprising a head portion and a leg portion which is to be inserted in an opening of an vessel, wherein at least a leg portion is laminated with a film of a copolymer of tetrafluoroethylene, ethylene and at least one fluorine-containing vinyl monomer copolymerizable with tetrafluoroethylene and ethylene, a molar ratio of tetrafluoroethylene and ethylene being from 62:38 to 90:10 and the amount of the fluorine-containing vinyl monomer being from 0.1 to 10 % by mole based on the total number of mole of tetrafluoroethylene and ethylene.
Claim 3
Dependent Claim 21 words
A'laminated rubber stopper according to claim 1, wherein the thickness of the laminated copolymer film is from 0.002 to 0.5 mm.
Claim 4
Dependent Claim 23 words
A laminated rubber stopper according to claim 1, wherein the copolymer contains tetrafluoroethylene and ethylene in a molar ratio of 63:37 to 80:20.
Claim 5
Dependent Claim 34 words
A laminated rubber stopper according to claim 1, wherein the copolymer contains the fluorine-containing monomer in an amount of 0.5 to 5 % by mole based on the total amount of tetrafluoroethylene and ethylene.

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