| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic cap which displays an excellent steam barrier property, and also, can maintain a barrier property for a long time, and at the same time, has a specified absorbency as well. SOLUTION: This palstic cap main body comprises a plastic material containing materials having absorbency such as zeolite, calcium oxide, magnesium sulfate, alumina, activated carbon, clay mineral and silica gel. A gas barrier film comprising a metal, a metal oxide or a hard carbon and so forth is deposited at least on the external surface of the plastic cap main body. COPYRIGHT: (C)2005,JPO&NCIPI
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