Abstract: Provided is a monomer composition comprising methyl methacrylate and ?-olefin, wherein a methacrylic resin obtained by polymerization of a monomer mixture comprising the monomer composition guarantees excellent heat resistance and has excellent weather resistance, in which yellowing is suppressed.

Abstract: The present invention provides a method for mending projection and recess defects existing on the surface of a metallic plate, wherein steps (1) to (2) are repeated until it is determined in step (1) that mending of the projection and recess defects on the surface of the metallic plate is no longer necessary. Step (1): A step for shining light onto the surface of the metallic plate, detecting the positions of projection and recess defects on the surface of the metallic plate according to the brightness distribution on the metallic plate, the brightness distribution being obtained from reflected light, quantifying the brightness intensities of the projection and recess defects, and determining whether it is necessary to mend the projection and recess defects. Step (2): A step for mending the projection and recess defects for which it is determined in step (1) that mending is necessary.

Abstract: Provided are a foreign substance removal method and foreign substance removal device that have excellent continuous operation stability for sheets and excellent foreign substance removal performance, during removal of foreign substance. Suction boxes (3a, 3b) are arranged at a position between two conveyance support bodies (1a, 1b) having an arrangement interval fulfilling prescribed conditions, said position having vertical symmetry relative to the sheet (2). Air is jetted towards the sheet (2) from air nozzles (4a, 4b) arranged inside the suction boxes (3a, 3b). Foreign substances are detached from upon the sheet (2) and the detached foreign substances are recovered using suction air having an average suction airspeed of 0.8-1.2 m/sec from openings (5a, 5b) in the suction boxes (3a, 3b).