Abstract: Optically active maleimide derivatives of the formula: (where the various substituents are as defined in the description) are used as separating media for separating optical isomers and geometrical isomers such as by high performance liquid chromatography.

Abstract: Optically active maleimide derivatives of the formula: (where the various substituents are as defined in the description) are used as separating media for separating optical isomers and geometrical isomers such as by high performance liquid chromatography.

Abstract: Optically active maleimide derivatives of the formula: (where the various substituents are as defined in the description) are used as separating media for separating optical isomers and geometrical isomers such as by high performance liquid chromatography.

Abstract: Optically active maleimide derivatives of the formula: (where the various substituents are as defined in the description) are used as separating media for separating optical isomers and geometrical isomers such as by high performance liquid chromatography.

Abstract: Optically active maleimide derivatives of the formula: (where the various substituents are as defined in the description) are used as separating media for separating optical isomers and geometrical isomers such as by high performance liquid chromatography.

Abstract: Optically active maleimide derivatives of the formula: 1

Abstract: A vertical injection apparatus is incorporated with a parting mold including upper and lower mold halves and defining a cavity to be filled with a melt. The lower mold half has a vertical sleeve hole at the outer side thereof and a vertical melt passage hold communicating between the cavity and the sleeve hole. The upper mold half has a vertically extending pin hole coaxial with the melt passage hole and open to the cavity and provided with a vertically extending mold pin movable through the pin hole. At least an upper part of the melt passage hole in the vicinity of the cavity has a diameter smaller than that of the sleeve hole but slightly large than the of the mold pin. Preferably, the cavity is designed for a disk wheel having a central hole through which the mold pin is allowed to pass, and the lower mold half forms a contoured inner surface corresponding to a decorated surface of the disk wheel.

Abstract: A die casting machine in which a rotary table, mounted with a plurality of die open and close units each holding a die, is sequentially brought into association with a plurality of work stations. The die is clamped in two steps, that is, a regular die clamping and a temporary die clamping. The regular die clamping is carried out by applying the regular clamping force required by a particular injection step. The temporary die clamping is carried out by applying a clamping force which is smaller than the regular clamping force. Consequently, this die casting machine can greatly reduce the time required for the casting cycle for each product, thus providing remarkably improved productivity. Preferably, a metal cooling apparatus suitable for a rotary die casting machine may be further provided.