A photopolymerisable system is disclosed which can be polymerised by exposure to UV light, for example, to form a solid, light-transmitting sheet material having volume refractive index variations defining an optical diffuser or a hologram, for example. The system includes a silicone monomer, prepolymer,...http://www.google.com.au/patents/US7232651?utm_source=gb-gplus-sharePatent US7232651 - Optical recording materials
