METHOD FOR DEPOSITING A TRANSPARENT ANTISTATIC THIN FILM ON THE SURFACE OF A SHAPED OBJECT OF WHICH AT LEAST THE SURFACE PORTION IS MADE OF A STYRENE POLYMER OR COPOLYMER, TO PROVIDE SAID OBJECT WITH LASTING ANTISTATIC PROPERTIES WITHOUT ALTERING ITS APPEARANCE

摘要

2066585 9202661 PCTABSCORF2 We operate by producing a reactive gas flow of the cold plasma type by the action of a continuous, alternating or pulsed electric field with a frequency ranging from 0 Hz to 1000 kHz on a gas atmosphere maintained under a pressure between 5 Pa and 100 Pa and consisting of vapors of one or more organotin compounds such as tetramethyltin, and keeping the shaped object, below its softening point, in contact with the reactive gas flow for a sufficient time to deposit on the surface of said object a film derived from the organotin compound and having a thickness between 10 nm and 1500 nm. The object thus coated has a lasting antistatic effect without modifying its surface appearance.