Tuesday, January 17, 2012

US Patent 8092904 - Optical article including a SWCNT antistatic layer


Static charges can attract dust and have an adverse effect during the manufacture of optical articles such as the glass used in flat panel displays. This patent from 3M teaches a solution to this problem by using an antistatic layer formed from single walled carbon nanotubes. Claim 1 reads:

1. An optical article comprising:

a first optical layer;

a second optical layer; and

an antistatic layer disposed between the first and second optical layers, the antistatic layer comprising conducting particles having an aspect ratio greater than about 10 and comprising single-walled carbon nanotubes having a length of 100 um or less and a diameter of 2 nm or less, wherein the antistatic layer has an average total thickness of less than about 10 nm and exhibits a surface resistivity of greater than about 1×108 ohms/sq.