METHOD FOR PRODUCING OPTICAL TRANSMISSION BODY OF SYNTHETIC RESIN

摘要

PURPOSE:To obtain an optical transmission body having a good index distribution quickly and efficiently by bringing monomer forming a polymer differing in refractive index from a net-like (co)polymer into contact with the transparent gel of said (co)polymer to diffuse the monomer in the gel and irradiating microwave from the outside. CONSTITUTION:A transparent gel-like bar wherein the monomers in a (co)polymer of diallyl phthalate or monomers having >=2 vinyl groups, (meth)acrylic groups are polymerized at 10-95wt% is obtd. by filling the monomers in a nylon tube and polymerizing the same. The gel-like transparent body 1 is immersed in a monomer having a refractive index larger or smaller than the refractive index of the polymer obtd. by complecting the polymn. and is pulled up or a gaseous monomer is put in an irradiating part 2 and the monomer diffused in the gel body 1 and the gel body are polymerized and cured by using a microwave oscillator 5. The optical transmission body having a good index distribution wherein the refractive index increases or decreases continuously in proportion to the square of the distance from the central axis is obtained quickly and efficiently.