Importance

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Abstract

A process for producing a light-transmitting element of a synthetic resin, which comprises (1) preparing a mixture composed of at least three monomers, said monomers having a difference in the ease of polymerization under given polymerization conditions, and that monomer in the monomeric mixture which is easiest to polymerize being capable of giving a polymer having a lower refractive index than a polymer from any of the other monomers in the monomeric mixture, (2) maintaining the monomeric mixture in a predetermined shape, and (3) thereafter applying to the monomeric mixture maintained in the predetermined shape such polymerization conditions that polymerization begins at the outside portion of the predetermined shape of the monomeric mixture and proceeds gradually toward its inside portion, thereby to form a polymeric article in which the proportion of polymer units derived from the monomer which is easiest to polymerize is largest at said outside portion and gradually decreases toward its inside portion and the refractive index of the article is lowest at said outside portion and gradually increases toward its inside portion.

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First Claim