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A high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsaturated compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes

A high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsaturated compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes at least one photochromic dye. Also a curing process, which includes a combination of multi-step radiation curing and thermal annealing. Articles produced of cured composition exhibit superior physical and, in appropriate cases, photochromic properties and can be easily mass produced on a commercial scale due to short processing time and use of readily available chemicals.

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1. A high refractive index core resin composition comprising(i) 2 to 70 parts by weight of at least one first compound corresponding to formula (I): ?wherein n and n′ independently are 3-5, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH?CH, C(CH3)2 or a single bond, and

1. A high refractive index core resin composition comprising(i) 2 to 70 parts by weight of at least one first compound corresponding to formula (I): ?wherein n and n′ independently are 3-5, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH?CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl, (ii) 2 to 80 parts by weight of at least one second compound corresponding to formula (II): ?wherein m is at least 1, and R5-R7 independently represent H or C1-C6 alkyl; (iii) 2 to 60 parts by weight of a reactive diluent selected from the group consisting of 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene, and mixtures thereof; and (iv) 2 to 60 parts by weight of a multi-functional (meth)acrylate or (meth)acrylate derivative with three or more acrylate functional groups selected from the group consisting of trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, glyceryl tri(meth)acrylate pentaerythritol tetra(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, penta(meth)acrylate ester and mixtures thereof; per 100 total parts by weight of components (i), (ii), (iii) and (iv), the composition further comprising (v) 0.0001 to 1.0 part by weight of at least one photochromic dye; (vi) 0.01 to 3 part by weight of a photo initiator; (vii) 0.01 to 3 part by weight of a thermal initiator; and (viii) up to 5 total parts by weight of other additives selected from the group consisting of light stabilizers, mold release agents and processing agents. 2. A composition according to claim 1, wherein R1, R4, R5, R7 are CH3, R2, R3, R6 are hydrogen, y1-y8are hydrogen, and X is C(CH3)2.3. A composition according to claim 1, further comprising isopropylxanthic disulfide.4. A composition according to claim 1, wherein said at least one photochromic dye is selected from the group consisting of chromenes, fulgides, fulgimides, spirooxazines, naphthopyrans, and mixtures thereof.5. A composition according to claim 1, wherein the composition is radiation curable.6. A composition according claim 5, wherein the composition is ultraviolet radiation curable.7. A composition according to claim 1, wherein the photo initiator is selected from the group consisting of benzophenone, 2,2-dimethoxy-2-phenyl acetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino propan-1-one, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and mixtures thereof.8. A composition according to claim 7, wherein the photo initiator comprises 2,4,6-trimethylbenzoyl diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide or mixtures thereof.9. A composition according to claim 1, wherein the thermal initiator is selected from the group consisting of t-amyl peroxy-2-ethylhexanoate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxyl-2-methylbenzoate, 1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane, t-butyl peroxy-3,5,5-trimethylhexanoate, t-butyl peroxy 2-ethylhexyl carbonate, dibenzoyl peroxide, t-amyl peroxy benzoate, 2,2′-azobis(2,4-dimethylpentanenitrile), 2,2′azobis(2-methylpropanenitrile), 2,2′azobis(2-methylbutanenitrile), 1,1′azobis(cyclohexanecarbonitrile), and mixtures thereof.10. A composition according to claim 9, wherein the thermal initiator comprises 2,2′-azobis(2,4-dimethylpentanenitrile), 2,2′azobis(2-methylpropanenitrile), 2,2′azobis(2-methylbutanenitrile), 1,1′azobis(cyclohexanecarbonitrile) or mixtures thereof.11. A composition according to claim 1, wherein said composition has a viscosity of less than 400 cps at room temperature.12. A process of producing a cured synthetic resin article comprising:(i) filling a mold assembly with a synthetic resin composition; and (ii) curing the resin composition by subjecting the filled mold to radiation from an actinic radiation source, wherein the synthetic resin composition is a high refractive index core resin composition comprising: (i) 2 to 70 carts by weight of at least one first compound corresponding to formula (I): ?wherein n and n′ independently are 3-5, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH?CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl, (ii) 2 to 80 parts by weight of at least one second compound corresponding to formula (II): ?wherein m is at least 1, and R5-R7 independently represent H or C1-C6 alkyl; (iii) 2 to 60 parts by weight of a reactive diluent selected from the group consisting of 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene, and mixtures thereof; and (iv) 2 to 60 parts by weight of a multi-functional (meth)acrylate or (meth)acrylate derivative with three or more acrylate functional groups selected from the group consisting of trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, glyceryl tri(meth)acrylate pentaerythritol tetra(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, penta(meth)acrylate ester and mixtures thereof; per 100 total parts by weight of components (i), (ii), (iii) and (iv), the composition further comprising (v) 0.0001 to 1.0 part by weight of at least one photochromic dye; (vi) 0.01 to 3 part by weight of a photo initiator; and (vii) 0.01 to 3 part by weight of a thermal initiator, and wherein the synthetic resin composition has a viscosity of less than 400 cps at room temperature. 13. A process according to claim 12, wherein said radiation source is a filtered actinic radiation source.14. A process according to claim 13, wherein the filter has a cutoff wavelength at or below the radiation source's primary output wavelength.15. A process according to claim 12, wherein the filled mold is subjected to radiation in a single stage radiation exposure step of up to 30 minutes duration.16. A process according to claim 12, wherein the filled mold is subjected to radiation in a multiple stage radiation cure comprising a plurality of radiation exposure steps of from about 10 seconds to about 20 minutes duration each with intervening cooling periods.17. A process according to claim 16, wherein the intervening cooling is effected by exposing the filled mold at the end of each radiation exposure step to a cooling medium selected from the group consisting of ambient air, chilled air, ambient water and chilled water.18. A process according to claim 16, wherein the synthetic resin composition is subjected to radiation from the actinic radiation source until the composition approaches its thermal polymerization reaction initiation temperature.19. A process according to claim 12, wherein the curing step further comprisessubjecting the synthetic resin composition to radiation from the actinic radiation source until the composition approaches its thermal polymerization reaction initiation temperature, cooling the synthetic resin composition, again subjecting the synthetic resin composition to radiation from the actinic radiation source until the composition approaches its thermal polymerization reaction initiation temperature, again cooling the synthetic resin composition, wherein the radiation and cooling steps are repeated until the synthetic resin composition is substantially cured.20. A process according to claim 12, further comprising (iii) thermally annealing the radiation cured composition.21. A process according to claim 20, wherein the cured composition is thermally annealed at a temperature of from about 50 to about 150° C. for up to about 2 hours.22. A process according to claim 20, wherein the cured composition is thermally annealed prior to removal from the mold assembly.23. A process according to claim 20, wherein the cured composition is thermally annealed after removal from the mold assembly.24. A process according to claim 20, wherein thermal annealing is effected both prior to and after removal of the cured composition from the mold assembly.25. A process according to claim 12, wherein a radiation filter, which cuts off 99% of UV radiation up to 400 nm is placed between the radiation source and the photochromic composition so that the photochromic dye is not activated during the radiation exposure.26. A process according to claim 12, wherein a radiation filter, which cuts off substantially all UV radiation up to a wavelength at which the photochromic dye is not active, is placed between the radiation source and the photochromic composition so that the photochromic dye is not activated during the radiation exposure.27. A synthetic resin article made from a radiation cured resin composition according to claim 1.28. A synthetic resin article according to claim 25, wherein the resin composition is cured by combined radiation and thermal curing.29. A synthetic resin article according to claim 25, wherein the cured resin composition is subjected to thermal annealing.30. A process of producing a cured synthetic resin article comprising:filling a mold assembly with a synthetic resin composition; and curing the resin composition by subjecting the filled mold to radiation from an actinic radiation source, wherein the filled mold is subjected to radiation in a multiple stage radiation cure comprising a plurality of radiation exposure steps of from about 10 seconds to about 20 minutes duration each with intervening cooling periods, and wherein the synthetic resin composition is a high refractive index core resin composition comprising: (i) 2 to 70 parts by weight of at least one first compound corresponding to formula (I): ?wherein n and n′independently are 0-30, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH?CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl, (ii) 2 to 80 parts by weight of at least one second compound corresponding to formula (II): ?wherein m is at least 1, and R5-R7 independently represent H or C1-C6 alkyl; (iii) 2 to 60 parts by weight of a reactive diluent selected from the group consisting of 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene, and mixtures thereof; and (iv) 2 to 60 parts by weight of a multi-functional (meth)acrylate or (meth)acrylate derivative with three or more acrylate functional groups selected from the group consisting of trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, glyceryl tri(meth)acrylate pentaerythritol tetra(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, penta(meth)acrylate ester and mixtures thereof; per 100 total parts by weight of components (I), (ii), (iii) and (iv), the composition further comprising (v) 0.0001 to 1.0 part by weight of at least one photochromic dye; (vii) 0.01 to 3 part by weight of a photo initiator; and (vii) 0.01 to 3 part by weight of a thermal initiator. 31. A process according claim 30, wherein the intervening cooling is effected by exposing the filled mold at the end of each radiation exposure step to a cooling medium selected from the group consisting of ambient air, chilled air, ambient water and chilled water.32. A process according to claim 30, wherein the synthetic resin composition is subjected to radiation from the actinic radiation source until the composition approaches its thermal polymerization reaction initiation temperature.