An embodiment relates to a polymerizable composition for a plastic lens. The polymerizable composition for a plastic lens according to the embodiment comprises a nonhalogenated tin-based catalyst and a diketone compound as a low-temperature reaction rate controlling agent. Accordingly, the polymerizable composition has a more stable pot life so that the polymerization rate can be appropriately controlled, thereby improving the reactivity and the workability, and that the generation of bubbles are prevented, thereby improving the transparency of the resin.

The present disclosure describes polymer compositions obtained from cyclic 1,2-disulfides and alkyne monomers, which result in materials with optically useful properties. The disclosure also describes synthetic methods for making these polymer compositions.

The present disclosure describes polymer compositions obtained from cyclic 1,2-disulfides and alkyne monomers, which result in materials with optically useful properties. The disclosure also describes synthetic methods for making these polymer compositions.

The present invention aims to provide a polymer material that has a high refractive index and can be suitably used for applications such as optical applications. The present invention relates to the sulfur-containing polymer containing at least one structural unit selected from the group consisting of a structural unit (A) represented by the following formula (1), a structural unit (B) represented by the following formula (2), and a structural unit (C) represented by the following formula (3); and a reactive functional group, ##STR00001##
wherein X.sup.1, X.sup.2, and X.sup.3 are the same as or different from each other and are each an optionally substituted divalent aromatic hydrocarbon group.

The present invention aims to provide a polymer material that has a high refractive index and can be suitably used for applications such as optical applications. The present invention relates to the sulfur-containing polymer containing at least one structural unit selected from the group consisting of a structural unit (A) represented by the following formula (1), a structural unit (B) represented by the following formula (2), and a structural unit (C) represented by the following formula (3); and a reactive functional group, ##STR00001##
wherein X.sup.1, X.sup.2, and X.sup.3 are the same as or different from each other and are each an optionally substituted divalent aromatic hydrocarbon group.