Patent ID: 7142754
Filing Date: 2006-11-28
Classification: C08F,G02B

Abstract:
1. A plastic optical fiber comprising: a core made of a polymethylmethacrylate or a copolymer mainly containing methyl methacrylate unit; and a clad made of a copolymer prepared by polymerizing at least a vinyl compound (A) which gives a homopolymer with a refractive index of 1.50 or more, fluoroalkyl (meth)acrylate (B) represented by the following formula (1) and methyl methacrylate (C), wherein a weight ratio of monomer (A) component/monomer (B) component ((A)/(B)) in the copolymer is within the range of 0.2 to 1: wherein X represents H or CH 3; and Rf represents a fluoroalkyl having 7 to 14 carbon atoms both inclusive and 13 to 25 fluorine atoms both inclusive, wherein the copolymer has a refractive index of 1.45 or more and a rupture deflection of 7.5 mm or more as determined by the ASTM D790 bending test (test piece dimensions; length: 5 inch, width: 0.5 inch, thickness: 0.25 inch; distance between supports: 10 cm; head speed: 3 mm/min), wherein the plastic optical fiber has a numerical aperture of 0.35 or less and a transmission loss of 150 dB/km or less at a driving NA of 0.1 for a wavelength of 650 nm, and wherein the copolymer for the clad comprises a benzyl methacrylate unit as the monomer (A) component.