| 摘要 |
To eliminate contamination of foreign matters deposited on the surface for a rubber stopper for tight sealing for medical purpose as for tight sealing of a medical injection liquid bottle, a vulcanized film of propylene-tetrafluoroethylene-glycidyl vinyl ether copolymer rubber is coated partially or wholly onto the surface of the rubber stopper. Vulcanization of the copolymer rubber can be carried out only by heating in the absence of a vulcanizing agent, and a vulcanized film with a good adhesiveness to the rubber stopper and a good sliding characteristic can be formed thereon.
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