A transparent plastic article with less internal strain is produced by successively polymerizing a monomer part by part with forming a gel state part between the already polym­ erized part and the unpolymerized part, or by polymerizing a monomer by means of a mold which can follow cure shrink­ age of the monomer in order to decrease cure shrinkage. The article produced is particularly suitable for optical applica­ tions such as an optical disc, a lens and a prism.
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