Jack Yui Chan

6367930, Apr 9, 2002

Dec 30, 1999

09/476251

Pia I. Santelices - Portland OR
James N. Rieck - Wheeling WV
Jack C. Chan - Coraopolis PA
Sivaram Krishnan - Pittsburgh PA
William G. Curtis - Sewickley PA
Robert Allen Pyles - Bethel Park PA

Bayer Corporation - Pittsburgh PA

G02C 710

351177, 351163, 351166

A process for making a photochromic optical lens is disclosed. In a first embodiment of the process a multi-plied laminate, containing a ply of photochromic thermoplastic polyurethane (herein âTPUâ) and a ply containing thermoplastic polycarbonate, is first placed in the cavity of a suitable mold. The ply that contains polycarbonate resin is placed facing the cavity. Thermoplastic polycarbonate resin is then injected into the cavity. In a second embodiment, referred to as an over-mold method, polycarbonate is first injection molded into a molding cavity to form a substrate. Photochromic TPU is, in a subsequent step, injected into the cavity to form a superstrate overlay. In both embodiments, the articles thus molded are suitable for the preparation of optical lenses.

20030158365, Aug 21, 2003

Jan 9, 2002

10/043738

Wolfgang Brauer - Leverkusen, DE
Herbert Heidingsfeld - Frechen, DE
Hans-Georg Hoppe - Leichlingen, DE
Wolfgang Kaufhold - Koln, DE
Bernhard Schulte - Krefeld, DE
Jack Chan - Mission Viejo CA, US
Steven Manning - Imperial PA, US
Nicholas Nardo - Weirton WV, US

C08G018/00

528/044000

A continuous process for the preparation of a thermoplastic polyurethane elastomer is disclosed. The process is carried out at 130 to 250 C. and comprises reacting at least one polyether diol with at least one organic diisocyanate and 1,4-di-(2,2′-hydroxyethyl)-hydroquinone, in the presence of tin dioctoate as a catalyst. The resulting thermoplastic polyurethane has a glass transition temperature (T) below 50 C. The inventive thermoplastic polyurethane is suitable for making injection molded or extruded articles.