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Polymerizable compositions containing ethylenically unsaturated monomers having episulfide functional groups and related methods
Polymerizable compositions containing ethylenically unsaturated monomers having episulfide functional groups and related methods
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机译:包含具有环硫官能团的烯键式不饱和单体的可聚合组合物和相关方法
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摘要
Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a epithiopropyl functional group; (b) optionally, a compound having two or more epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an isourea functional polymerization initiator; and (d) a catalyst for reaction between the -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 -epithiopropyl functional groups, a polymerizable composition of: (a) a monomer composition including ethylenically unsaturated monomer having a epithiopropyl functional group; and, optionally, (b) a compound having two or more epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups.
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