Patent ID: 8883948

Claim:
A dark curing polymerizable composition comprising: a. a monomer with at least one abstractable hydrogen selected from the group consisting of 2-hydroxyethyl acrylate (HEA), 2-hydroxyethyl methacrylate (HEMA), acrylamide, methacrylamide, bisGMA {2,2-bis[4-(2-hydroxy-3-methacryloxyprop-1-oxy)phenyl]propane}, urethane dimethacrylate, glycerol monomethacrylate, 1,3-glycerol dimethacrylate, tetrahydrofurfuryl methacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate (HDDA), methacrylic acid, triethylene glycol dimethacrylate, styrene, and neodecyl vinyl ester; and b. a three-component initiator system, soluble in said monomer, comprising: i. methylene blue; ii. an electron donor selected from the group consisting of N,N-diisopropyl-3-pentylamine, N-ethyldiisopropylamine, and 1,2,2,6,6-pentamethylpiperidine; and iii. an electron acceptor selected from the group consisting of ferrocenium hexafluorophosphate, diphenyliodonium hexafluoroarsenate, [4-[(2-hydroxytetradecyl)oxyl]phenyl]phenyliodonium hexafluoroantimonate, diphenyliodonium hexafluorophosphate, 2,4,6-tris(trifluoromethyl)-1,3,5-triazine, diphenyl iodonium chloride and diphenyl iodonium tetrafluoroborate.