Abstract: A method for forming a conductive graphite film comprises the steps of forming a carbon film on substrate material heated to 700.degree. C. or higher through a plasma discharge using hydrocarbon gas as raw material and subjecting the film to heat treatment at temperatures exceeding 1,500.degree. C.

Abstract: A heat resistant plastic optical fiber having a three component structure of a core, a cladding and a sheath, wherein the core material comprises an amorphous transparent polymer, the cladding material comprises a transparent polymer having a refractive index lower than that of the core material, and the sheath material comprises a resin which is hardenable by irradiation with ultraviolet rays.

Abstract: A plastic optical fiber which comprises a core consisting of an amorphous polymer containing a plasticizer and a cladding consisting of a transparent polymer which substantially prevents cross-migration of said plasticizer therein and has a refractive index lower than the core polymer, and which is preferably produced by a process which comprises heat polymerizing a monomer which is polymerized to afford said amorphous polymer and contains said plasticizer, a polymerization initiator and a chain transfer agent, melt spinning said amorphous polymer to form a core and simultaneously cladding the core with said transparent polymer.

Abstract: A process for producing a plastic optical fiber which consists of a core made of a homo- or co-polymer of alkyl methacrylate and a cladding made of a fluorine-containing polymer, which process comprising forming the cladding around the core and irradiating the optical fiber with an electron beam, the optical fiber produced by the process being used at a temperature higher than 80.degree. C. without significant loss of light transmission.

Abstract: A plastic optical fiber comprising a core of a copolymer of an alkyl methacrylate and a styrene derivative and a cladding of a copolymer of vinylidene fluoride and a perfluoroolefin provided on the core, the copolymer of the cladding having a melting point of at least 120.degree. C. and a perfluoroolefin content in the range of from 3 mol % to 70 mol %.

Abstract: A self-bonding magnet wire comprising a conductor and a baked mixture of nylon copolymer (A) and nylon copolymer (B) where the proportion of nylon copolymer (A) and nylon copolymer (B) is 50-95 parts of (A) to 50 to 5 parts of (B) (by weight), nylon copolymer (A) being alcohol-insoluble and non-swellable by an alcohol at room temperature and containing nylon-12, and nylon copolymer (B) having a lower melting point than that of nylon copolymer (A). Yoke coils for television sets comprising such a magnet wire and a process for forming such a magnet wire are also disclosed.