Patent ID: 7811481

Claim:
A method for manufacturing a polarizing plastic optical element including a polarizing film, which contains a hydroxyl group-containing resin, and optical resin layers, the method comprising the steps of: preparing a polymerization raw material composition for forming the optical resin layers and containing a first compound containing a first functional group, a second compound containing a second functional group, and a polymerization catalyst, the first and second compounds being main components of the polymerization raw material composition, the first functional group being at least one selected from isocyanate functional group and isothiocyanate functional group, the second functional group being at least one selected from hydroxyl group and mercapto group; preparing a mold assembly including a first mold component having an inner bottom surface, a fastening member attached to the first mold component, and a second mold component attached to the first mold component; arranging the polarizing film on the inner bottom surface of the first mold component; attaching the fastening member to the first mold component and holding a peripheral portion of the polarizing film between the fastening member and the first mold component; attaching the second mold component to the first mold component and defining a first cavity between the second mold component and a first main surface of the polarizing film; injecting the polymerization raw material composition into the first cavity; polymerizing and curing the polymerization raw material composition to form one of an urethane bond and a thiourethane bond between the hydroxyl group included in the polarizing film and the first functional group included in the optical resin layer in the first cavity to mold an intermediate molded product including an optical resin layer integrated with the first main surface of the polarizing film; removing the intermediate molded product together with the second mold component and the fastening member from the first mold component; attaching the intermediate molded product together with the second mold component and the fastening member to a third mold component that is smaller than the first mold component to support the peripheral portion of the polarizing film included in the intermediate molded product by the third mold component and defining a second cavity between a second main surface of the polarizing film and an inner surface of the third mold component; injecting the polymerization raw material composition into the second cavity; and polymerizing and curing the polymerization raw material composition in the second cavity to form one of an urethane bond and a thiourethane bond between the hydroxyl group included in the polarizing film and the first functional group included in the optical resin layer in the second cavity.