Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform
Patent
1999-06-16
2000-10-24
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Optical fiber, waveguide, or preform
264 136, 264 138, 264 21, 264 124, B29D 400
Patent
active
061362344
ABSTRACT:
A gradient refractive-index plastic rod is prepared by prepolymerizing a mixture containing a first monomer and at least a component selected from a second monomer and a non-reactive dopant sealed in a tube, while rotating the tube horizontally around its longitudinal axis; and polymerizing the resulting prepolymer or prepolymers while keeping the tube vertical. In the vertical polymerization stage, the polymerization undergoes in the direction from the periphery to the center of the tube due to an increase of polymerization rate caused by gel effect of the prepolymers which has been piled up on the tube wall during the centrifugal stage, so that the monomers contained in the central part of the tube diffuse outwardly, and thus a plastic rod having a larger region of gradient refractive-index is obtained.
REFERENCES:
patent: 3718383 (1973-02-01), Moore
patent: 5405556 (1995-04-01), Liu
patent: 5541247 (1996-07-01), Koike
patent: 5593621 (1997-01-01), Koike et al.
patent: 5846456 (1998-12-01), Liu
Chen Jiunn-Lang
Liu Jui-Hsiang
National Science Council
Vargot Mathieu D.
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