Molded rubber article

Abstract

A molded rubber article for sealing a container for storing medicinal chemicals comprising a fluorine resin film solidly covering the surface of the molded article which may contact with the chemicals. At least the surface of the bare rubber surface 300 which may contact with chemicals comprises a fluorine resin film layer 100, and a polyolefin film layer 200 is interposed between the fluorine resin film layer and the bare rubber surface. It can be preferably used as a rubber plug, a syringe gasket, a nozzle cap or an inside plug.

Description

TECHNICAL FIELD [0001]The present invention relates to a molded rubber article for sealing a container or an instrument used in medication or medical care application, more specifically a molded rubber article having a fluorine resin film which solidly covers the surface which may contact with chemicals.BACKGROUND ART [0002]As a sealing material for a container or an instrument used in medication and medical care applications, rubber materials are considered to be suitable in view of sealing performance. Natural rubbers used to be widely utilized and synthetic rubbers are now widely used for these application. Among other things copolymerized rubbers (IIR) of isobutylene and isoprene are widely used in view of functionality.[0003]For the purpose of preventing cross-linking agents and compounding agents contained in rubbers from eluting into medicinal chemicals stored in a container, preventing contents in a container from absorbing onto bare rubber surface, preventing rubber members...

AI Technical Summary

Benefits of technology

[0036]A molded rubber article according to the present invention is useful as a sealing member for a container for storing medicinal chemicals like a rubber plug or a cylinder cap because the interface between a bare rubber surface and a polyolefin film layer has a high adherence property, the interface between the polyolefin film layer and a fluorine resin film layer has a high adherence property, and the interfaces are n

Problems solved by technology

Although a fluorine resin film has a high functionality as a medicinal chemical wrapping material because of the high lubricity and a low reactivity, it has a drawback that it is difficult to adhere to a bare rubber surface.

Although the adherence property of a fluorine resin film to a bare rubber surface can improve by using such processes, the adhesion strength does not sufficiently improve in a kind of rubber materials and there is a possibility of detachment of a film from the bare rubber surface during use.

For example, a rubber member containing halogen or a rubber member with a high forming temperature (e.g. a halogenated butyl rubber) have a relatively high adherence property to a fluorine resin film, however a regular butyl rubber, a ethylene propylene rubber (EPDM), a styrene elastomer (SEBS, SBS) and a rubber which is composed mostly of polybutadiene or polyisobutylene (including a thermoplastic elastomer) does not have a sufficient adherence property to a fluorine resin film, and there was an interface detachment problem.

The workability becomes very poor when a fluorine resin film (having a high chemical resistance property, a high whether resistance property and a high antifouling property) is laminated on the surface of a sheet-shaped member like a wallpaper member because a fluorine resin film is not elastic.

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