| 摘要 |
PURPOSE:To provide the titled composition free from change in coloring and color tone with time, capable of giving products of good mechanical properties, e.g., printing material, dental filler, comprising a vinyl monomer and photopolymerization initiator consisting of a combination of polysulfide and alpha-diketone. CONSTITUTION:The objective composition comprising (A) a vinyl monomer (e.g., ethylene glycol diacrylate, bisphenol A diglycidyl acrylate) and (B) normally 0.1-5wt%, based on said monomer, of, as a photopolymerization initiator, a combination of (i) polysulfide [pref. a compound of formula (n is 0-10; R is alkyl, phenyl or benzyl), e.g., diphenyl disulfide, trimethylene disulfide] and (ii) 0.1-20wt%, based on the component (i), of alpha-diketone (e.g., camphorquinone). EFFECT:Because of using such as initiator as to induce curing under the visible ray range, this composition will pose no health hazards; furthermore, the plant investment being inexpensive. |
