Patent ID: 7709551
Filing Date: 2010-05-04
Classification: C08K,C09D,G02B,Y10T

Abstract:
1. A coating composition for a film with low refractive index characteristically containing: a) porous organic/inorganic hybrid nano-particles having an average diameter of 5-30 nm and a maximum C/Si ratio of 0.65; b) a photocurable compound containing unsaturated functional groups and photoinitiator or photosensitizer; or organic siloxane thermosetting compound; and c) a solvent, wherein the porous organic/inorganic hybrid nano-particles of a) are prepared by the hydrolysis and condensation of the mixture of i) a silane compound, ii) a structural regulator, iii) water and iv) a solvent, producing porous nano-particles 5-30 nm in diameter on average and eliminating the structural regulator from the produced porous nano-particles having a 5-30 nm diameter on average, and the silane compound of i) is a mixture of a silane compound represented by Formula 1 and a silane compound represented by Formula 2, and the maximum C/Si ratio of the silane compound Formula 2 for 1 mole of the silane compound of Formula 1 is 0.65: wherein R R 2 and R 3 are independently acetoxy, hydroxy, or C 1 -C 4 straight or branched alkoxy.