PLASTIC FORMED ARTICLE HAVING A VAPOR-DEPOSITED FILM BY A PLASMA CVD METHOD
This invention relates to a plastic formed article having a vapor-deposited film on a surface of a plastic substrate by a plasma CVD method, the vapor-deposited film including an organosilicon vapor-deposited layer on the surface of the plastic substrate 1 and containing no oxygen, and a silicon oxide vapor-deposited layer on the organosilicon vapor-deposited layer. The plastic formed article not only features favorable gas-barrier property but also effectively prevents the generation of offensive odor at the time of vapor deposition and, further, offers excellent flavor-retaining property.
1 . A plastic formed article comprising a plastic substrate and a vapor-deposited film on a surface of said plastic substrate by a plasma CVD method, wherein:
said vapor-deposited film includes a first vapor-deposited layer on the surface of said plastic substrate and a second vapor-deposited layer on said first vapor-deposited layer; and
said first vapor-deposited layer is a vapor-deposited organometal layer which does not contain oxygen as a constituent element.
2 . The plastic formed article according to claim 1 , wherein said second vapor-deposited layer is a vapor-deposited oxide layer.
3 . The plastic formed article according to claim 1 , wherein said vapor-deposited organometal layer comprises an organosilicon polymer.
4 . The plastic formed article according to claim 1 , wherein said plastic substrate comprises a biodegradable resin.
5 . The plastic formed article according to claim 1 , wherein said plastic formed article is a container.
6 . A method of forming a vapor-deposited film on a surface of a plastic substrate by a plasma CVD by feeding a reaction gas onto the plastic substrate, including steps of:
forming a first vapor-deposited layer on the surface of the plastic substrate by the plasma CVD by using, as a reaction gas, a gas of an organometal compound without containing oxygen in the molecules thereof; and
forming a second vapor-deposited layer on the first vapor-deposited layer by the plasma CVD by using a different reaction gas.
7 . The method of forming a vapor-deposited film according to claim 6 , wherein in the step of forming the second vapor-deposited layer, a mixed gas of a gas of the organometal compound and an oxidizing gas is used as the reaction gas.
8 . The method of forming a vapor-deposited film according to claim 6 , wherein an organosilicon compound is used as said organometal compound.
9 . The method of forming a vapor-deposited film according to claim 8 , wherein at least one compound selected from the group consisting of hexamethyldisilane, vinyltrimethylsilane, methylsilane, dimethylsilane, trimethylsilane, diethylsilane, propylsilane, phenylsilane and silazane is used as said organosilicon compound.
10 . The method of forming a vapor-deposited film according to claim 6 , wherein in the step of the second vapor-deposited layer, a mixed gas of a gas of an organometal compound containing oxygen in the molecules thereof and an oxidizing gas is used as the reaction gas.
11 . The method of forming a vapor-deposited film according to claim 10 , wherein a siloxane is used as the organometal compound containing oxygen in the molecules thereof.
12 . The method of forming a vapor-deposited film according to claim 6 , wherein a biodegradable resin substrate is used as said plastic substrate.
13 . The method of forming a vapor-deposited film according to claim 6 , wherein a plastic container is used as said plastic substrate.
14 . The method of forming a vapor-deposited film according to claim 13 , wherein the plastic container is a bottle.