Ppg Industries Ohio, Inc.

Intercast Usa, Inc.

Intercast Europe S.p.a.

Intercast Europe, Srl

Intercast Europe S.p.l.

Federico Menta

Paolo Baiocchi

Matthew J Kryger

Nina Vassileva Bojkova

Matteo Lagasi

Giuseppe Iori

Marvin Jerome Graham

Charles R Hickenboth

Graziano Marusi

Gian Giuseppe Giani

David Lewis Lusher, Ii

Keith M Cross

David L Lusher

Provided is a method of preparing a transparent, non-elastomeric optical article including (1) combining to form a reaction mixture free of urethanation catalysts (a) a polyisocyanate component; and (b) an active hydrogen component of polyol and/or polythiol, and at least one compound containing both amine and hydroxyl functional groups; (2) allowing the polyisocyanate component to react with amine functional groups in the active hydrogen component to form an intermediate product including a polyurea prepolymer having hydroxyl functional groups in admixture with the polyol and/or polythiol and, optionally, the compound containing both amine and hydroxyl functional groups; (3) mixing the intermediate product with additional polyisocyanates and optionally a urethanation catalyst to form a second reaction mixture; (4) introducing the second reaction mixture to a mold to form a thermoset polymerizate; and (5) releasing the polymerizate from the mold. Optical films and articles prepared by the method also are provided.

Methods for preparing optical articles and optical articles prepared therefrom

Provided is a transparent, non-elastomeric optical article prepared by (1) combining to form a reaction mixture (a) a polyisocyanate component; and (b) an active hydrogen component including (b1) a first component free of amino groups including at least one first polyol; and (b2) a second component containing (i) a second polyol and/or a polythiol and (ii) a compound containing both amine and hydroxyl functional groups; (2) introducing the reaction mixture to a mold at a temperature and for a time sufficient to form a thermoset polymerizate; and (3) releasing the polymerizate from the mold to yield a transparent, non-elastomeric optical article. Also provided is a method for preparing a transparent optical film. Optical films and articles prepared by the methods also are provided.

Optical articles and methods for preparation of same

The present invention provides a method for preparing a customized polymeric article including: providing two mold half-sections, each half-section having an outer surface and an inner surface; assembling the two mold half-sections to form a mold assembly such that the inner surfaces define a cavity there between; applying one or more magnetic fluids to the inner surface of a mold half-section; inserting a fluid polymeric material into the cavity; controllably applying a magnetic field to the magnetic fluids to form a customized reversible surface in accordance with a predetermined specific surface topography; subjecting the mold assembly to conditions sufficient to effect polymerization or hardening of the fluid polymeric material; and separating the two mold half-sections. Articles prepared by the method also are provided.

Methods for preparing customized polymeric articles

A composition for the preparation of a transparent, non-elastomeric optical article is provided, the composition including: Multi-step and one-pot methods of preparing a cured, non-elastomeric polyurethane-containing optical article are also provided.

Polyurethane urea-containing compositions and optical articles and methods for preparing them

Provided is a polymerizable composition of (a) a monomer composition including ethylenically unsaturated monomer having a &#x3b2;-epithiopropyl functional group; (b) optionally, a compound having two or more &#x3b2;-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups; (c) an isourea functional polymerization initiator; and (d) a catalyst for reaction between the &#x3b2;-epithiopropyl functional groups. Also provided is a method of reducing the yellowness index of a sulfur-containing polymerizate prepared by addition polymerization, the method including reacting in the presence of an isourea functional polymerization initiator and a catalyst for reaction between &#x3b2;-epithiopropyl functional groups, a polymerizable composition of: (a) a monomer composition including ethylenically unsaturated monomer having a &#x3b2;-epithiopropyl functional group; and, optionally, (b) a compound having two or more &#x3b2;-epithiopropyl functional groups but no polymerizable ethylenically unsaturated groups.

Polymerizable compositions containing ethylenically unsaturated monomers having episulfide functional groups and related methods

Method of manufacturing a high impact polarized optical element and polarized optical element including an integrally bonded polarizing film

A method of manufacturing a polarized optical element comprises the steps of: The method allows to reliably manufacture a polarized optical element comprising an optical part made of polyurethane-based optical material and a polarizing film integrally bonded to the optical part even using thin freestanding polarizing films, such as PVA films, achieving at the same time improved adhesion properties of the polarizing film to the optical material.

A multi-layer thin film is provided preferably for use with photochromic lenses, wherein the thin film comprises a plurality of layers, preferably including dielectric layers, selected and arranged so as to reflect less than about 6 percent of the UVA rays in a range of about 315 to 400 nm, more preferably about 350 to 380 nm. The thin film preferably has an activation value greater than 25%.

Multilayer interference filter for photochromic lenses

A polarized optical element is disclosed comprising an upper portion and a lower portion defined at opposite parts with respect to a median line passing through the geometric center of the optical element, wherein: a) in the upper portion and at a distance of at least 10 mm from the median line the factor of luminous transmittance is between 3% and 20%; b) in the lower portion and at a distance of at least 10 mm from the median line the factor of luminous transmittance is between 15% and 65%; c) the ratio of the luminous transmittance measured in the lower portion at a distance of at least 10 mm below the median line and the luminous transmittance measured in the upper portion at a distance of at least 10 mm above the median line is not lower than 1.5; d) the colors of the upper and lower portions of the optical element are such that: d1) the absolute value of the difference between the value of the colorimetric coordinate a* of the upper portion measured at a point located 10 mm above the median line and the value of the colorimetric coordinate a* of the lower portion measured at a point located 10 mm below the median line is comprised between 0 and 60, d2) the absolute value of the difference between the value of the colorimetric coordinate b* of the upper portion measured at a point located 10 mm above the median line and the value of the colorimetric coordinate b* of the lower portion measured at a point located 10 mm below the median line is comprised between 0 and 60, e) the degree of polarization of the optical element is uniform both along a vertical and along a horizontal direction and is equal to at least 45% as measured according to European Standard EN 1836.

Polarized optical element having differentiated transmittance properties for use in eye-protecting devices

A lens including a polarizing film within a polyurethanic material which comprises a photochromic dye therein.

Polarized lenses with variable transmission

An optical element is disclosed comprising at least one transparent eye-protecting portion comprising a plastic material, preferably having a hardness within a range of about 40 Shore A to about 77 Shore D, as measured according to ASTM Standard D2240, and an elongation at break within a range of about 200% to about 700%, as measured according to ASTM Standard D638.

Soft optical element for use in eye-protecting devices

A plano-convex optical sheet having a positive power including:

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Parma, Italy

Federico Menta