Patent ID: 8822018

Claim:
A substrate, comprising: a) a silicon oxycarbide, SiO x C y , primer layer having an RMS roughness of greater than 4 nm; and b) a hydrophobic coating on the primer layer, wherein the hydrophobic coating comprises a fluorocompound wherein at least one condition selected from the group consisting of (i) and (ii) is satisfied: (i) the RMS roughness of the primer layer is formed by at least one irregularity on a surface of the primer layer, wherein a height of the at least one irregularity is between 5 and 100 nm and the number of the at least one irregularity is at least 10 per μm 2 of coated substrate; and (ii) the fluorocompound is a perfluoro-terminated alkylsilane comprising a perfluoropolyether group.