The invention relates to a process for the preparation of alkylimidazolidone acrylates, generally expressed as compound : . The process for manufacturing a microporous polyolefin film according to the invention comprises mixingextrusion through efficient and separate injection of 15-55% by weight of polyolefin, and 85-45% by weight of a diluent which forms thermodynamic single phase with the polyolefin and a diluent which can undergo thermodynamic liquid-liquid phase separation with the polyolefin, into an extruder. Also included is a support structure providing support for at least portions of the electrical traces and including a head slider mounting region adapted to receive the head slider. In addition, a novel root canal filling material comprises: a Portland cement, a radiopaque substance, and an amorphous divalent metal ion salt with formula of, , or. One or more optimizations may be included in the optical structure including optically absorbing materials, varying the geometry of the structure to change reflective angles, using optical apertures, changing the reflectivity of one or more mirrors, changing the photodiode to be more impervious to spontaneous emissions, and using ion implants to reduce photoluminescence efficiency.