Patent ID: 7914897

Claim:
A substrate having a coating formed of a composition comprising: at least one compound of formula I and optionally at least one compound of formula II R a Si(R 1 ) n (X 1 ) 3-n I R b Si(R 2 ) m (X 2 ) 3-m II wherein R a is a straight-chain or branched C (1-24) alkyl group, R b is an aromatic group, optionally an optionally substituted carbocyclic and heterocyclic group comprising five-, six- or ten-membered ring systems, which is linked by a single covalent bond or a spacer unit, optionally a straight-chain or branched alkyl residue having 1 to 8 carbon atoms, to the Si— atom, R 1 and R 2 are independently of each other a straight chain or a branched hydrocarbon radical having 1 to 6 carbon atoms, X 1 and X 2 are independently of each other a hydrolysable group, which is one or more of a halogen or an alkoxy group, and n, m are independently of each other 0 or 1 wherein the coating is in the form of filaments that are up to several μm in length with diameters ranging from 10 nm to 160 nm.