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Compositions are provided that include an electron donor and a sensitizing compound. More specifically, the electron donor is an arylsulfinate salt. Methods of polymerization are also provided that can be used to prepare polymeric material from a photopolymerizable composition that includes ethyleni

Compositions are provided that include an electron donor and a sensitizing compound. More specifically, the electron donor is an arylsulfinate salt. Methods of polymerization are also provided that can be used to prepare polymeric material from a photopolymerizable composition that includes ethylenically unsaturated monomers and a photoinitiator system. The photoinitiator system includes an electron donor and a sensitizing compound.

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We claim: 1. A composition comprising: an electron donor comprising an arylsulfinate salt having a anion of Formula I description="In-line Formulae" end="lead"Ar1--SO231 Idescription="In-line Formulae" end="tail" and a cation having at least one carbon atom and either a positively charged nit

We claim: 1. A composition comprising: an electron donor comprising an arylsulfinate salt having a anion of Formula I description="In-line Formulae" end="lead"Ar1--SO231 Idescription="In-line Formulae" end="tail" and a cation having at least one carbon atom and either a positively charged nitrogen atom or a positively charged phosphorus atom, said electron donor having an oxidation potential in N,N-dimethylformamide of 0.0 to +0.4 volts versus a silver/silver nitrate reference electrode, wherein Ar1 is a substituted phenyl, an unsubstituted or substituted C7-30 aryl, or an unsubstituted or substituted C 3-30 heteroaryl, said substituted Ar1 having a substituent that is an electron withdrawing group or an electron withdrawing group in combination with an electron donating group the cation is selected from 1) a phosphorous-containing cation of Formula III where each R2 is independently an unsubstituted alkyl, an alkyl substituted with a hydroxy, an unsubstituted aryl, or an aryl substituted with an ethyl, hydroxy, or combinations thereof; or 2) a nitrogen-containing cation having a ring structure comprising a 4 to 12 member heterocyclic group having a positively charged nitrogen atom, said heterocyclic being saturated or unsaturated and having up to 3 heteroatoms selected from oxygen, sulfur, nitrogen, or combinations thereof, wherein said ring structure is unsubstituted or substituted with a substituent selected from an alkyl, aryl, acyl, alkoxy, aryloxy, halo, mercapto, amino, hydroxy, azo, cyano, carboxy, alkoxycarbonyl, aryloxycarbonyl, halocarbonyl, or combinations thereof; and a sensitizing compound capable of absorbing a wavelength of actinic radiation in the range of 250 to 1000 nanometer, the sensitizing compound comprising a dye selected from a ketone, xanthene, acridine, thiazole, thiazine, oxazine, azine, aminoketone, aromatic polycyclic hydrocarbon, p-substituted aminostyryl ketone, aminotriaryl methane, cyanine, pyridinium, or triarylmethane. 2. The composition of claim 1, wherein the Ar1 group of the arylsulfinate salt is anthryl, naphthyl, acenaphthyl, phenanthryl, phenanthrenyl, perylenyl, anthracl, anthraquinonyl, anthronyl, biphenyl, terphenyl, 9,10-dihydroanthracenyl, or fluorenyl, said Ar1 group being unsubstituted or substituted with an electron withdrawing group or an electron withdrawing group in combination with an electron donating group. 3. The composition of claim 1, wherein the Ar1 group of the arylsulfinate salt is quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, cinnolinyl, benzofuranyl, benzomercaptophenyl, benzoxazolyl, benzothiazolyl, benzirnidazolyl, indolyl, phthalazinyl, benzothiadiazolyl, benzothiazolyl, phenazinyl, phenanthridinyl, acridinyl, or indazolyl, said Ar1 group being unsubstituted or substituted with an electron withdrawing group or an electron withdrawing group in combination with an electron donating group. 4. The composition of claim 1, wherein the Ar1 group of the arylsulfinate salt is a substituted phenyl, an unsubstituted or substituted naphthyl, or an unsubstituted or substituted anthraquinonyl, said substituted Ar1 having a substituent that is an electron withdrawing group or an electron withdrawing group in combination with an electron donating group. 5. The composition of claim 1, wherein the Ar1 group is phenyl substituted with an electron withdrawing group selected from halo, cyano, fluoroalkyl, perfluoroalkyl, carboxy, alkoxycarbonyl, aryloxycarbonyl, halocarbonyl, formyl, carbonyl, sulfo, alkoxysulfonyl, aryloxysulfonyl, perfluoroallcylsulfonyl, alkylsulfonyl, azo, alkenyl, alkynyl, dialkyiphosphonato, diaryiphosphonato, aminocarbonyl, or combinations thereof. 6. The composition of claim 1, wherein the anion of the arylsulfinate salt is 4-chlorobenzenesulfinate, 4-cyanobenzenesulfinate, 4-ethoxycarbonylbenzenesulfinate, 4-trifluoromethylbenzenesulfinate, 3-trifluoromethylbenzenesulfinate, 1-anthraquinone sulfinate, 1-naphthalenesulfinate, or 2-naphthalenesulfinate. 7. The composition of claim 1, wherein the nitrogen-containing cation of the arylsulfinate salt has ring structure comprising a 5 member heterocyclic group, a 5 member heterocyclic group fused to an aromatic ring having 0 to 3 heteroatoms, a 6 member heterocyclic group, or a 6 member heterocyclic group fused to an aromatic ring having 0 to 3 heteroatoms, wherein said ring structure is unsubstituted or substituted with a substituent selected from an alkyl, aryl, acyl, alkoxy, aryloxy, halo, mercapto, amino, hydroxy, azo, cyano, carboxy, alkoxycarbonyl, aryloxycarbonyl, halocarbonyl, or combinations thereof. 8. The composition of claim 1, wherein said heterocyclic group is bicyclic. 9. The composition of claim 1, wherein said heterocyclic group is fused to a cyclic or bicyclic group that is saturated or unsaturated and that has 0 to 3 heteroatoms. 10. The composition of claim 1, wherein said heterocyclic group is fused to an aromatic ring having 0 to 3 heteroatoms. 11. The composition of claim 1, wherein the cation of the arylsulfinate salt is of Formula III where each R2 is independently an unsubstituted aryl or an aryl substituted with an ailcyl, hydroxy, or combinations thereof. 12. The composition of claim 1, wherein the cation of the arylsulfinate salt is a tetraphenylphosphonium ion. 13. The composition of claim 1, further comprising an ethylenically unsaturated monomer. 14. The composition of claim 13, wherein the ethylenically unsaturated monomer comprises a monoacrylate, monomethacrylate, diacrylate, dimethacrylate, polyacrylate, polymethacrylate, or combinations thereof. 15. The composition of claim 1, wherein the composition is free of an electron acceptor selected from a metal ions in an oxidized state, persulfates, peroxides, iodoniuni salts, hexaarylbisimidazoles, or combinations thereof. 16. The composition of claim 1, wherein the sensitizing compound is a xanthene dye, monoketone, diketone, or combinations thereof. 17. The composition of claim 1, wherein the sensitizing compound is an alpha-diketone.