Ppg Industries Ohio, Inc.

Transitions Optical, Inc.

Michael B Levesque

William P Blackburn

Kevin J Stewart

Kevin W Seybert

Jeanine A Conklin

Nancyanne Gruchacz

Robert J Bowles, Iii

Ernesto Maldonado

Cathy L Short

Describes a photochromic plastic article, e.g., an ophthalmic photochromic article, such as a lens, in which the article includes (1) a polymeric substrate, such as a thermoset or thermoplastic substrate, (2) a photochromic polymeric coating appended to at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one organic photochromic material, e.g., spirooxazine, naphthopyran and/or fulgide, and (3) a radiation-cured, acrylate-based film coherently appended to the photochromic coating, the acrylate-based film being (a) resistant to removal by aqueous solutions of inorganic caustic, e.g., potassium hydroxide, (b) compatible with organo silane-containing abrasion-resistant coating, and (c) harder than said photochromic coating. Describes also the aforedescribed photochromic article having an abrasion-resistant coating affixed to the radiation-cured acrylate-based film, e.g., an abrasion-resistant coating comprising an organo silane; and a photochromic article having an antireflective coating affixed to the abrasion-resistant coating.

Photochromic optical article

Describes a photochromic article, e.g., a plastic ophthalmic photochromic article, such as a lens, in which the article includes (1) a rigid substrate, such as a thermoset or thermoplastic polymeric substrate, (2) a photochromic polymeric coating appended to at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one photochromic material, e.g., spirooxazine, naphthopyran and/or fulgide, and (3) an acrylate-based film coherently appended to the photochromic coating, the acrylate-based film containing an adhesion promoting amount of an adhesion promoter, e.g., an aminoorganosilane, silane coupling agent, organic titanate coupling agent or organic zirconate coupling agent. Describes also the aforedescribed photochromic article having an abrasion-resistant coating affixed to the acrylate-based film, e.g., an abrasion-resistant coating comprising an organo silane; and a photochromic article having an antireflective coating affixed to the abrasion-resistant coating.

Described is an process for producing uniform coatings on circular substrates that reduces the amount of coating required. The improved process includes the steps of applying the liquid coating material through a single opening of a dispenser having certain characteristics, in a pattern onto the center of a spinning substrate, and then radially moving the dispenser opening near to the edge of the substrate while maintaining the dispenser opening at a predetermined distance from the substrate surface for substantially the entire radius of the substrate providing uniform coverage. Also described are products produced by the process that are substantially free of cosmetic defects and may be photochromic.

Spin and spray coating process for curved surfaces

Growing community of inventors

Tampa, FL, United States of America

Michael B Levesque