Process for the preparation of photosensitive body surface coating material

A process for the preparation of a photosensitive body surface coating material, the process comprising:

• i) forming a polysiloxane and coating the polysiloxane on a substrate, wherein the polysiloxane is formed by hydrolytic condensation of a silane in the presence of a mixed solvent comprising alcohol and water in the presence of finely divided silica;
• wherein the silane has a formula R.sup.2 Si(OR.sup.3).sub.3, wherein each R.sup.2 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms;
• and R.sup.3 is a straight-chain saturated hydrocarbon group of 1 to 8 carbon atoms;
• and
• ii) heat curing the polysiloxane to form a polysiloxane resin of formula R.sup.1 SiO.sub.3/2, wherein each R.sup.1 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms;
• and with the proviso that not less than 1 mol % and not more than 80 mol % of all the R.sup.1 groups are fluorohydrocarbon groups;
• and wherein the polysiloxane is selected such that, after heat curing, the polysiloxane resin has a water contact angle of not less than 95.degree..