Blending polysiloxane glass resins to produce optical films with a specific refractive index

Commercially available polysiloxane resins can be blended either in the solid state or in solution to produce optically transparent films whose refractive index is a linear function of the weight percent of one component. Useful applications for these "glass resins" include protective coatings for hydroscopic optical crystals, antireflective or index-matching films, and homeotropic alignment layers for liquid crystal devices.