Abstract: A plastic optical fiber cable that is strong in repeated flexure, ensuring low light loss at bending with a bend radius of 2 mm. The plastic optical fiber cable is one composed of a multicore plastic optical fiber strand including 7 to 10,000 cores of transparent resin, island portions each consisting of at least one core-surrounding sheath layer of transparent resin with a refractive index lower than that of the transparent resin constituting the cores and sea portion of resin surrounding the island portions and, enclosing the multicore plastic optical fiber strand, a coating layer, characterized in that the resin constituting at least either the sheath layer or sea layer is one of 25 to 55 Shore D hardness while the resin constituting the coating layer consists of a thermoplastic resin of 500 to 2000 MP flexural modulus.

Abstract: A plastic optical fiber cable that is strong in repeated flexure, ensuring low light loss at bending with a bend radius of 2 mm. The plastic optical fiber cable is one composed of a multicore plastic optical fiber strand including 7 to 10,000 cores of transparent resin, island portions each consisting of at least one core-surrounding sheath layer of transparent resin with a refractive index lower than that of the transparent resin constituting the cores and sea portion of resin surrounding the island portions and, enclosing the multicore plastic optical fiber strand, a coating layer, characterized in that the resin constituting at least either the sheath layer or sea layer is one of 25 to 55 Shore D hardness while the resin constituting the coating layer consists of a thermoplastic resin of 500 to 2000 MP flexural modulus.

Abstract: The present invention relates to a multicore plastic optical fiber for light signal transmission comprising 7 or more cores having a diameter of 50 to 200 .mu.m which are covered with a cladding resin having a refractive index lower than that of the core resin by 0.005 to 0.04. The multicore plastic optical fiber of the present invention has low transmission loss in a broad transmission bandwidth and exhibits excellent bending characteristics. Therefore, it is suitable for transmission at a high speed in short and medium distances.

Abstract: The electrolysis of an aqueous alkali metal chloride solution in electrolytic cells of the type having anode compartments and cathode compartments separated by a cation-exchange membrane is performed with improved efficiency by positioning and maintaining the cathodes in intimate contact with one entire surface of the cation-exchange membranes and the porous anodes in as close as possible proximity to the other surface of the membranes.