Photochromic article
First Claim
1. A photochromic article consisting essentially of:
- (a) a transparent solid substrate having a front surface and a back surface, wherein said substrate is prepared from compositions selected from the group consisting of polymerizable allyl glycol carbonate monomer(s), thermoplastic polycarbonate, polyurea urethane, compositions comprising the reaction product of polyfunctional isocyanate(s) and polythiol monomer(s), compositions comprising the reaction product of polyfunctional isocyanate(s) and polyepisulfide monomer(s), optical quality mineral glass, and combinations thereof,(b) a transparent photochromic thermoplastic polyurethane film adjacent to at least one surface of said substrate, said polyurethane film having (i) a thickness of 2 to 15 mils, (ii) a flexural modulus of less than 2.5 GPa, and (iii) being formed from polyurethane material selected from the group consisting of polyether-based polyurethane, polycarbonate-based polyurethane and mixtures of such polyurethane materials, said polyurethane film containing at least one organic photochromic material that is soluble in the polyurethane film, and(c) transparent protective film of thermoplastic polymeric organic material superposed on said polyurethane film, said photochromic article exhibiting (1) a change in color when exposed to activating ultraviolet light radiation, and (2) a color fading half life (T½
) of not more than 500 seconds when the ultraviolet light radiation is removed.
2 Assignments
0 Petitions
Accused Products
Abstract
Describes an optical article, e.g., an ophthalmic photochromic article, such as a lens, in which the article includes: (1) a transparent substrate, such as a thermoset or thermoplastic plastic substrate, (2) a multiply laminate adjacent to at least one surface of the substrate, the laminate comprising (i) a transparent, thermoplastic polyurethane film, the thermoplastic, polyurethane film providing a desirable light filtering property, e.g., photochromism, and being juxtaposed to the surface of the substrate, the polyurethane being formed from a material comprising polyether-based polyurethane or polycarbonate-based polyurethane, and (ii) a transparent protective film of polymeric material, e.g., polycarbonate film, adjacent to the thermoplastic polyurethane film. Describes also the aforedescribed optical article having an abrasion-resistant coating affixed to the protective film, e.g., an organo-silane abrasion-resistant coating; and an optical article having an antireflective coating adhered to the abrasion-resistant coating.
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Citations
37 Claims
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1. A photochromic article consisting essentially of:
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(a) a transparent solid substrate having a front surface and a back surface, wherein said substrate is prepared from compositions selected from the group consisting of polymerizable allyl glycol carbonate monomer(s), thermoplastic polycarbonate, polyurea urethane, compositions comprising the reaction product of polyfunctional isocyanate(s) and polythiol monomer(s), compositions comprising the reaction product of polyfunctional isocyanate(s) and polyepisulfide monomer(s), optical quality mineral glass, and combinations thereof, (b) a transparent photochromic thermoplastic polyurethane film adjacent to at least one surface of said substrate, said polyurethane film having (i) a thickness of 2 to 15 mils, (ii) a flexural modulus of less than 2.5 GPa, and (iii) being formed from polyurethane material selected from the group consisting of polyether-based polyurethane, polycarbonate-based polyurethane and mixtures of such polyurethane materials, said polyurethane film containing at least one organic photochromic material that is soluble in the polyurethane film, and (c) transparent protective film of thermoplastic polymeric organic material superposed on said polyurethane film, said photochromic article exhibiting (1) a change in color when exposed to activating ultraviolet light radiation, and (2) a color fading half life (T½
) of not more than 500 seconds when the ultraviolet light radiation is removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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17. An ophthalmic photochromic article consisting essentially of:
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(a) a transparent solid optical polymeric substrate having a front surface and a back surface, wherein the solid optical substrate is prepared from compositions selected from the group consisting of polyurea urethane, the reaction product of polyfunctional isocyanate(s) and polythiol monomer(s), the reaction product of polyfunctional isocyanate(s) and polyepisulfide monomer(s), and combinations thereof, (b) a transparent thermoplastic photochromic polyurethane film contiguous to one surface of said substrate, said polyurethane film having (i) a light transmission of at least 80%, (ii) a flexural modulus of less than 2.5 GPa, (iii) a thickness of from 2 to 15 mils, and (iv) being formed from polyurethane material comprising polyether-based polyurethane, polycarbonate-based-polyurethane or mixtures of such polyurethane materials, said polyurethane film further containing a photochromic amount of at least one organic photochromic material that is soluble in the polyurethane film, and (c) a transparent thermoplastic protective film of polymeric organic material superposed on said polyurethane film, said polymeric protective film having a light transmission of at least 80%, a thickness of from 1 to 20 mils and a flexural modulus of from 0.5 to 3 Gpa, said ophthalmic photochromic article exhibiting a change in color from colorless to colored when exposed to activating ultraviolet light radiation, and a color fading half-life (T½
) of not more than 500 seconds when the ultraviolet light radiation is removed. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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36. A photochromic optical article comprising, in combination:
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(a) a transparent solid optical polyurea urethane substrate having a front surface and a back surface; (b) transparent thermoplastic photochromic polyurethane film appended to at least one surface of the optical substrate, said polyurethane film having (i) a thickness of 2 to 15 mils, (ii) a flexural modulus of less than 2.5 GPa, and (iii) being formed from polyurethane material selected from polyether-based polyurethane materials, polycarbonate-based polyurethane materials and mixtures of said polyurethane materials, said polyurethane film further containing from 0.2 to 10 weight percent of at least one organic photochromic material that is soluble in the polyurethane film, said photochromic material being chosen from naphthoxazines, spiro(indolino) pyridobenzoxazines, naphthopyrans, spiro-9-fluorenopyrans, phenanthropyrans, indeno-fused naphthopyrans and mixtures of such photochromic materials; and (c) transparent thermoplastic protective film of polymeric organic material superposed on said polyurethane film, said polymeric protective film having a flexural modulus of from 0.1 to 5 GPa, said polymeric protective film being selected from nylon, poly(vinyl acetate), vinyl chloride-vinyl acetate copolymer, poly(lower alkyl)acrylates, poly(lower alkyl)methacrylates, styrene-butadiene copolymer resin, polyurea urethane, lightly cross-linked thermoplastic polyurethane and thermoplastic polycarbonate material, said photochromic optical article exhibiting (1) a change in color when exposed to activating ultraviolet light radiation, and (2) a color fading half-life (T½
) of not more than 500 seconds when the ultraviolet light radiation is removed. - View Dependent Claims (37)
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Specification