Process for preparation of light-diffusing methacrylic resin plates

摘要

Light-diffusing methacrylic plates are continuously prepared by casting a polymerizable material composed of methyl methacrylate or a partially polymerized product thereof with 0.2 to 3.0% by weight of a light diffusing material between two belts. The belts are separated by an average distance l but are capable of both compression and expansion relative to this average separation. The method involves applying compression at at least one point in the casting space to reduce the separation distance and then allowing expansion back to a maximum distance wherein the maximum spacing between the belts is from (l+1) mm to (l+0.2) mm and the minimum spacing during compression is from (l-1) mm to (l-0.2) mm.