Mitsubishi Rayon Company, Limited

Ryuji Murata

Takashi Yamamoto

Katsuhiko Shimada

Yoshihiro Uozu

Kenichi Sakunaga

Tsuruyoshi Matsumoto

Yasuteru Tahara

Yoshihiko Mishina

Teruta Ishimaru

Hiromu Terada

Masaaki Oda

Nobuhiko Toyoda

Distributed graded index type optical transmission plastic article and

Disclosed is a cladding composition suitable for a plastic clad silica or glass core optical fiber of a good light transmittance. The cladding composition comprises (A) a fluorinated monofunctional acrylate or .alpha.-fluoroacrylate composition, (B) a polyfunctional acrylate or .alpha.-fluoroacrylate having at least two acryloyl or .alpha.-fluoroacryloyl radicals in the molecule, (C) a photoinitiator, and if desired, (D) a stabilizer selected from thiodicarboxylic acid diesters and hindered phenols. The fluorinated monofunctional acrylate or .alpha.-fluoroacrylate comprises 1-60 weight % of a highly fluorinated acrylate or .alpha.-fluoroacrylate of the formula: ##STR1## wherein Y is H or F, X is H or F, l is 1 to 12 and n is 5 to 12, and 40-99 weight % of a lowly fluorinated acrylate or .alpha.-fluoroacrylate of the formula: ##STR2## wherein X and Y are as defined above, and m is 1 to 3.

Plastic cladding composition for silica or glass core optical fiber, and

Distributed refractive index type optical transmission plastic article

Disclosed is a cladding composition for a plastic clad plastic core optical fiber, which comprises (a) an ultraviolet ray-curable monofunctional acrylic or .alpha.-fluoroacrylic monomer, (b) a polyfunctional acrylate or .alpha.-fluoroacrylate having at least two acryloyl or .alpha.-fluoroacryloy radicals in the molecule and (c) a photoinitiator. The difference (n.sub.1 -n.sub.2) between the refractive index n.sub.1 of the plastic core and the refractive index n.sub.2 of a cured product of the cladding composition is at least 0.01. The plastic clad plastic core optical fiber inhibits an enhanced heat resistance.

Plastic cladding composition for plastic core optical fiber, and plastic

A plastic optical fiber which is superior in the light transmission characteristics, particularly in those within a visible light region and also superior in heat resistance, and a process for producing the same are provided, which plastic optical fiber comprises a polycarbonate as its core material and a polymer as its cladding material having a refractive index lower than that of the core material, wherein the relationship between the light transmission loss L.sub.500 (dB/km) of the fiber as measured at a wavelength of 500 nm and that as measured at 660 nm being expressed by the following inequality:

Plastic optical fiber and process for producing the same

Plastic optical fibers

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Iwakuni, Japan

Ryuji Murata