Abstract: A method for producing meta-xylylenediisocyanates includes a reaction step in which monohalogenated benzenes, formaldehydes, and an amide compound represented by general formula (1) below are allowed to react in the presence of an acidic liquid to produce a bisamide compound; a dehalogenation step in which in the bisamide compound, the halogen atom derived from the monohalogenated benzenes is replaced with a hydrogen atom; and a thermal decomposition step in which the bisamide compound from which the halogen atom is eliminated is subjected to thermal decomposition. In the reaction step, the acidic liquid contains inorganic acid, the equivalent ratio of the hydrogen atom of the inorganic acid relative to the monohalogenated benzenes is more than 14, the acidic liquid has an inorganic acid concentration of more than 90 mass %, and the reaction temperature is more than 10° C. General formula (1): wherein R1 represents an alkoxy group or an amino group.

Abstract: An optical material of the present invention includes: a phosphor which has an excitation wavelength in a range from 220 nm to 500 nm, a fluorescence wavelength in a range from 380 nm to 650 nm, a maximum excitation wavelength in a range from 350 nm to 400 nm, and a maximum fluorescence wavelength in a range from 400 nm to 500 nm; and an ultraviolet light absorber, and the light transmittance thereof measured at a thickness of 2 mm satisfies the following features (1) to (3): (1) The light transmittance at a wavelength of 440 nm is 80% or higher. (2) The light transmittance at a wavelength of 420 nm is 70% or lower. (3) The light transmittance at a wavelength of 410 nm is 5% or lower.

Abstract: The optical material of the present invention contains one or more kinds of ultraviolet absorber (a) having a maximum absorption peak within a range of equal to or greater than 350 nm and equal to or less than 370 nm, in which a light transmittance of the optical material having a thickness of 2 mm satisfies the following characteristics (1) to (3), (1) a light transmittance at a wavelength of 410 nm is equal to or less than 10%, (2) a light transmittance at a wavelength of 420 nm is equal to or less than 70%, and (3) a light transmittance at a wavelength of 440 nm is equal to or greater than 80%.

Abstract: An exact change coin collection device has a coin holding chamber into which all coins collected are temporarily directed. A coin collection stopper releases coins from the coin holding chamber into a coin collection chamber when a preset monetary amount of genuine coins is inserted. A coin return stopper releases all coins from the coin holding chamber into a coin return when the value of coins collected exceeds the preset monetary amount; a counterfeit coin is inserted; or the time since the last coin was inserted exceeds a predetermined time. A setting mechanism permits setting the preset monetary amount.