PURPOSE: To make the moldability of a plug extremely excellent and, at the same time, to prevent the sorption of VE, by forming the plug used in a container for a liquid agent, which contains tocopherol acetate and a derivative (VE) thereof, from a propylene/ethylene copolymer.
CONSTITUTION: A VE sorption preventing plug is molded from a propylene/ ethylene copolymer. This copolymer is prepared by supplying propylene gas and ethylene gas to a reaction tank but the supply of both gases to the reaction tank may be performed at the same time or at random or said gases may be supplied individually and regularly in a definite ratio. The wt. ratio of propylene and ethylene of the copolymer is about 90W98:10W2, pref. about 95:5. The plug is easily molded from the copolymer by plug molding technique frequently used in general.
| JPS582764 | [Title of the device] Sealing |
| WO/2009/051282 | VIAL RUBBER-STOPPER |
SAMEJIMA YASUYOSHI
OKADA SABURO
| JPS61232851A | 1986-10-17 | |||
| JPS5898348A | 1983-06-11 |
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