Biodegradable resin container with a vacuum-evaporated film and method of forming a vacuum-evaporated film

摘要

A biodegradable resin bottle having a container wall (1) including a biodegradable resin and having a vacuum-evaporated film (3) formed on the inner surface of the container wall (1) by a plasma CVD method. The vacuum-evaporated film (3) includes a first hydrocarbon vacuum-evaporated layer (3a) positioned on the inner surface of the container wall and a second hydrocarbon vacuum-evaporated layer (3b) formed on the above hydrocarbon vacuum-evaporated layer (3a). The first hydrocarbon vacuum-evaporated layer (3a) has polar groups introduced therein. The second hydrocarbon vacuum-evaporated layer (3b) exhibits hydrocarbon peaks stemming from CH, CH2 and CH3 in a region of wave numbers of 3200 to 2600 cm−1 as measured by FT-IR, has a CH2 ratio of not larger than 35% and a CH3 ratio of not smaller than 40% per the sum of CH, CH2 and CH3 calculated from the hydrocarbon peaks, and has no polar group introduced therein.

主权项

1. A biodegradable resin container having a container wall comprising a polylactic resin and having a vacuum-evaporated film formed on an inner surface of the container wall by a plasma CVD method; wherein
said vacuum-evaporated film includes a first hydrocarbon vacuum-evaporated layer positioned on the inner surface of the container wall and a second hydrocarbon vacuum-evaporated layer formed on said first hydrocarbon vacuum-evaporated layer; said first hydrocarbon vacuum-evaporated layer has polar groups introduced therein; said first hydrocarbon vacuum-evaporated layer exhibits a peak stemming from an OH group in a region of wave numbers of 3200 to 3800 cm−1 as measured by FT-IR; said first hydrocarbon vacuum-evaporated layer exhibits hydrocarbon peaks stemming from CH, CH2 and CH3 in a region of wave numbers of 3200 to 2600 cm−1 as measured by FT-IR, has a CH2 ratio of not larger than 35% and a CH3 ratio of not smaller than 40% per the sum of CH, CH2 and CH3 calculated from the hydrocarbon peaks; and said second hydrocarbon vacuum-evaporated layer exhibits hydrocarbon peaks stemming from CH, CH2 and CH3 in a region of wave numbers of 3200 to 2600 cm−1 as measured by FT-IR, has a CH2 ratio of not larger than 35% and a CH3 ratio of not smaller than 40% per the sum of CH, CH2 and CH3 calculated from the hydrocarbon peaks, and has no polar group introduced therein.