3m Innovative Properties Company

Christopher W A Krohe

Stephen A Johnson

Victor Ho

Michael Benton Free

Thomas J Blong

Yu Yang

Suresh Iyer

Dong-Wei Zhu

Ryan T Fabick

Edward J Kivel

Jeffrey A Peterson

Timothy D Fletcher

Jiyoung Park

Benjamin J Bending

Kevin T Huseby

Thomas E S Muehle

Kyle P Starkey

Photochromic article having first and second opposed major surfaces comprising a first, transparent layer having first and second opposed major surfaces, the first layer comprising thermoplastic, a second, transparent layer having first and second opposed major surfaces, the second layer comprising photochromic dye and amorphous copolyester, wherein the first major surface of the second layer is adjacent to the second major surface of the first layer, and a third layer having first and second opposed major surfaces, wherein the first major surface of the third layer is adjacent to the second major surface of the second layer. Embodiments of photochromic article described herein are useful, for example in eyewear, window films, security films, decorative films, electronic devices (i.e., having a display with a photochromic article).

Photochromic articles

Polyester polymers are described comprising polymerized units comprising a hydroxy functional aromatic group wherein the hydroxy group has been functionalized with an adhesion promoting group. In some embodiments, the polyester polymer comprises polymerized units have the general structure (A) wherein Land Lare independently divalent linking groups comprising an ester group; and Ris an adhesion promoting group bonded to the oxygen atom by means of an ionic or covalent bond. In other embodiments, film articles, laminates are described and methods of making functionalized polyester polymers are described. 

Functionalized polyester polymers and film articles

A birefringent polyester film includes naphthalate units, ethylene units, a titanate compound, a planar branching unit, and 1 to 80 ppm metal content. The birefringent polyester film has an out-of-plane birefringence of at least 0.1 at 633 nm.

Birefringent polyester film with low haze having specified Tan Delta value

Growing community of inventors

Minneapolis, MN, United States of America

Christopher W A Krohe