ABRASION-RESISTANT OPTICAL PRODUCT WITH IMPROVED GAS PERMEABILITY
An optical product for use in products such as window films and electronic displays is disclosed. The optical product includes a polymeric substrate and a hardcoat and has an abrasion resistance at the hardcoat surface as measured by haze increase of no more than 4.5% when measured according to Taber abrasion testing based on ASTM D1044 and a difference in water vapor transmission rate when compared to said polymeric substrate alone of no more than 5 grams/m 2 /day.
1 . An optical product comprising a polymeric substrate, a hardcoat and a hardcoat surface, wherein said optical product has an abrasion resistance at said hardcoat surface as measured by haze increase of no more than 4.5% when measured according to Taber abrasion testing based on ASTM D1044 and a difference in water vapor transmission rate when compared to said polymeric substrate alone of no more than 5 grams/m 2 /day.
2 . The optical product of claim 1 wherein the polymeric substrate is transparent.
3 . The optical product of claim 2 wherein the polymeric substrate is formed from polyethylene terephthalate.
4 . The optical product of claim 1 wherein said hardcoat comprises a plurality of hardcoat layers.
5 . The optical product of claim 1 wherein said hardcoat comprises a ceramic material.
6 . The optical product of claim 5 wherein said hardcoat contains at least 65% by weight of said ceramic material based on the total weight of the hardcoat.
7 . The optical product of claim 5 wherein said ceramic material is an inorganic non-metallic material with the structure
R 1 —R 2
wherein R1 is selected from the group consisting of metals, boron, carbon, silicon and germanium and combinations thereof and R2 is selected from the group consisting of oxide, nitride, carbide, boride, silicide and combinations thereof.
8 . The optical product of claim 5 wherein said ceramic material is selected from the group consisting of silicon oxide, silicon nitride, titanium oxide, ZrO2, CrN, SiC and MoSi and combinations thereof.
9 . The optical product of claim 1 wherein said hardcoat has a refractive index (n550 nm) of from 1.38 to 1.45.
10 . The optical product of claim 1 wherein said hardcoat has a thickness of between 0.5 and 5 micrometers.
11 . The optical product of claim 1 further comprising a spectrally functional layer.
12 . The optical product of claim 11 wherein said spectrally functional layer is an anti-reflective layer.
13 . The optical product of claim 11 wherein said spectrally functional layer is a spectral filter.
14 . The optical product of claim 11 wherein said hardcoat is between said polymeric substrate and said anti-reflective layer.
15 . The optical product of claim 12 wherein said anti-reflective layer has a has a thickness less than the thickness of said hardcoat.
16 . The optical product of claim 15 wherein said antireflective layer has a refractive index n550 nm lower than the refractive index n550 nm of the hardcoat.
17 . A method for forming an optical product, said method comprising applying a ceramic material to a polymeric substrate to form a hardcoat thereon, wherein said applying step includes forming said hardcoat on said polymeric substrate from a gas precursor in the presence of plasma and wherein said optical product has an abrasion resistance at the hardcoat surface as measured by haze increase of no more than 4.5% when measured according to Taber abrasion testing based on ASTM D1044 and a difference in water vapor transmission rate when compared to said polymeric substrate alone of no more than 5 grams/m 2 /day.
18 . The method of claim 17 further comprising transforming a fluid precursor to gas prior to or simultaneously with said applying step.
19 . The method of claim 17 further comprising supplying a precursor-reactive gas as part of said applying step and supplying energy sufficient to initiate reaction between the gas precursor and the precursor-reactive gas.