Patent ID: 7754302

Claim:
A DLC film coated plastic container, comprising: a plastic container having a DLC film formed on the inner wall surface thereof, wherein the cross-sectional area of an opening of said container is made smaller than the cross-sectional area of a horizontal cross section at a body portion of said container and a neck portion is provided between said opening and said body portion; wherein the DLC film formed on said neck portion has a higher hydrogen atom content than the DLC film formed on said body portion, the oxygen permeability of said container is less than or equal to 0.0050 ml/container (500 ml PET container)/day (23° C. and RH90%, measurement values after 20 hours from the start of nitrogen gas replacement), the film thickness of the DLC film formed in the neck and body portion of the inside on said container is 10.9˜67.2 nm the composition proportion of carbon and hydrogen (carbon atom/hydrogen atom) of the DLC film formed on said neck portion is equal to or higher than 37/63 but equal to or lower than 43/57, and the composition proportion of carbon and hydrogen (carbon atom/hydrogen atom) of the DLC film formed on said body portion is equal to or higher than 55/45 but equal to or lower than 75/25, wherein the b* value of the neck portion is 6 or less, wherein the b* value includes the absorptance of the PET container.