A methacrylic resin moldings having surface micro structur and a manufacture method thereof
This invention provides a novel methacrylic resin moldings having surface microstructure, which has excellent mass-productivity and high accuracy in performing as an optical element and a manufacture method thereof. The methacrylic resin moldings of this invention is formed by injection of a resin composition comprising: (A) an unsaturated monomer mixture including 20 to 90 wt% of an unsaturated monomer based on methyl methacrylate and 10 to 80 wt% of an unsaturated monomer having at least two polymerizable double bonds in one molecule, (B) a polymer of an unsaturated monomer based on methyl methacrylate, that is, the resin particles consisting of 20 to 100 wt% of partial crosslinked resin particles and 0 to 80 wt% of non-crosslinked resin particles, and (C) polymerization initiating agent, into the gap between the cells (20, 22), one of which has a negative pattern (14b) with a surface microstructure able to provide the desired optical properties through changing its effective refractive index; and then cast polymerizing said resin composition.