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Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a β-epithiopropyl functional group; (b) optionally, a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an is

Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a β-epithiopropyl functional group; (b) optionally, a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an isourea functional polymerization initiator; and (d) a catalyst for reaction between the β-epithiopropyl functional groups. Also provided is a method of reducing the yellowness index of a sulfur-containing polymerizate prepared by addition polymerization, the method including reacting in the presence of an isourea functional polymerization initiator and a catalyst for reaction between β-epithiopropyl functional groups, a polymerizable composition of: (a) a monomer composition including ethylenically unsaturated monomer having a β-epithiopropyl functional group; and, optionally, (b) a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups.

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1. A polymerizable composition consisting of: (a) a monomer composition comprising at least one ethylenically unsaturated monomer having a β-epithiopropyl functional group;(b) a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups;(c) an

1. A polymerizable composition consisting of: (a) a monomer composition comprising at least one ethylenically unsaturated monomer having a β-epithiopropyl functional group;(b) a compound having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups;(c) an isourea functional polymerization initiator; and(d) a catalyst present in an amount sufficient to effect reaction between the β-epithiopropyl functional groups,wherein the monomer composition (a) further comprises at least one different polymerizable ethylenically unsaturated monomer comprising at least one of styrene, an alkyl acrylate, and an alkyl methacrylate. 2. The polymerizable composition of claim 1, wherein upon polymerization and formation of a polymerizate, the polymerizate demonstrates reduced yellowing compared to a similar polymerizable composition that does not contain the isourea functional polymerization initiator and the catalyst. 3. A polymerizate of the polymerizable composition of claim 2. 4. An optical element comprising the polymerizate of claim 3. 5. The polymerizable composition of claim 1, wherein the ethylenically unsaturated monomer having a β-epithiopropyl functional group comprises thioglycidylmethacrylate. 6. The polymerizable composition of claim 5, wherein the thioglycidylmethacrylate is formed within the polymerizable composition as a reaction product of a reaction composition comprising glycidyl methacrylate and thiourea. 7. The polymerizable composition of claim 1, wherein the compound (b) having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups is present in the polymerizable composition and is formed within the polymerizable composition as a reaction product of a reaction composition comprising 2,2-bis(4-glycidyloxyphenyl)propane and thiourea. 8. The polymerizable composition of claim 7, wherein the 2,2-bis(4-glycidyloxyphenyl)propane is a reaction product of a reaction composition comprising 2,2-bis(4-hydroxyphenyl)propane and epichlorohydrin. 9. The polymerizable composition of claim 1, wherein the isourea functional polymerization initiator (c) comprises at least one of an O-dialkylamino-isourea and an O-imino-isourea. 10. The polymerizable composition of claim 1, wherein the catalyst (d) comprises at least one of 1,4-diazabicyclo[2.2.2]octane, amines having a heterocyclic ring, phosphines, quaternary ammonium salts, quaternary phosphonium salts, tertiary sulfonium salts, secondary iodonium salts, boron trihalides and complexes thereof, organic acids and esters thereof, and metal halides. 11. A method of reducing the yellowness index of a sulfur-containing polymerizate prepared by addition polymerization, comprising reacting in the presence of an isourea functional polymerization initiator and a catalyst that effects reaction between β-epithiopropyl functional groups, the polymerizable composition of claim 1. 12. The method of claim 11, wherein upon polymerization and formation of a polymerizate, the polymerizate demonstrates reduced yellowing compared to a similar polymerizable composition that does not contain the isourea functional polymerization initiator and the catalyst. 13. The method of claim 11, wherein the ethylenically unsaturated monomer having a β-epithiopropyl functional group comprises thioglycidylmethacrylate. 14. The method of claim 13, wherein the thioglycidylmethacrylate is formed within the polymerizable composition as a reaction product of a reaction composition comprising glycidyl methacrylate and thiourea. 15. The method of claim 11, wherein the compound (b) having two or more β-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups is present in the polymerizable composition and is formed within the polymerizable composition as a reaction product of a reaction composition comprising 2,2-bis(4-glycidyloxyphenyl)propane and thiourea. 16. The method of claim 15, wherein the 2,2-bis(4-glycidyloxy phenyl)propane is a reaction product of a reaction composition comprising 2,2-bis(4-hydroxyphenyl)propane and epichlorohydrin. 17. The method of claim 11, wherein the isourea functional polymerization initiator (c) comprises at least one of an O-dialkylamino-isourea and an O-imino-isourea. 18. The method of claim 11, wherein the catalyst comprises at least one of 1,4-diazabicyclo[2.2.2]octane, amines having a heterocyclic ring, phosphines, quaternary ammonium salts, quaternary phosphonium salts, tertiary sulfonium salts, secondary iodonium salts, boron trihalides and complexes thereof, organic acids and esters thereof, and metal halides.