Plastic containers coated on the inner surface and process for production thereof
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United States of America Patent
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Issued Date -
Jun 2, 2005
app pub date -
Sep 17, 2004
filing date -
Apr 26, 2002
priority date (Note) -
Abandoned
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Abstract
The invention provides a plastic container with a coated inner surface having superior gas barrier properties. It further provides a plastic container with a coated inner surface capable of suppressing elution of minor components from the resin, in addition to having the superior gas barrier properties. The container has on its inner surface an amorphous carbon film formed by plasma CVD from a starting material containing carbon atoms and whose main component is carbon. In the carbon film, when the number of carbon atoms contained in the film is 100, the ratio of the number of nitrogen atoms is 15 or less, or the ratio of the number of oxygen atoms is 20 or less, or the ratio of the total number of nitrogen atoms and oxygen atoms is 27 or less. Alternatively, when the number of carbon atoms contained in the film is 100, the ratio of the number of nitrogen atoms is 15 or less, the ratio of the number of oxygen atoms is 20 or less, and the ratio of the total number of nitrogen atoms and oxygen atoms is 27 or less. The amorphous carbon film exhibits an oxygen permeability of 20.times.10.sup.-5 ml/day/cm.sup.2 or less.
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