The cured coating has the following properties: i) ii) good lubricating property, iii) excellent chemical and heat resistance, iv) good freezing and thawing resistance, and v) good gas impermeability. This coating can be used as the coating for a synthetic rubber stopper.
For example, a fluorine-containing elastomer, which has excellent heat and chemical resistance and can be cured by heat alone, can be incorporated into the composition of a rubber stopper. It can also be applied to a rubber stopper, which is then cured and cured to form a specific cured coating layer. This coating can be applied to a rubber stopper surface and can be cured in a similar manner to a curing composition containing a curing accelerator.
The graft copolymer obtained by copolymerization of glycidyl vinyl ether with siloxane, or by chemical reaction of polymer segments, can be cured as a cured coating layer. The graft copolymer has high thermal and chemical resistance and has an excellent lubricating property.
The solution of a curable composition preferably has a viscosity of less than 1000 cp at 25 deg C. The concentration of polymer is preferably less than 20 wt.%. The graft copolymer can be dissolved in an ethyl acetate, or dissolved in a solvent, and the ethyl acetate or solvent is then coated on the butyl rubber stopper. The solvent is then drained off and the rubber stopper is placed in a clinical autoclave for sterilization.
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