Hologram-recording materials usually consist of a photo-material consisting of an organic binder and a photopolymerizable monomer. However, the photopolymer lacks environmental durability. Kosuda, Hayashida, and Yoshinari have developed a hologram-recording material with high refractive index, flexibility, high sensitivity, low scattering, environmental resistance, durability, and low shrinkage, and sensitive not only to a green laser but also a blue laser: This material consists of a metal oxide containing Si and Zr with an aromatic carboxylic acid such as toluic acid and a photopolymerizable compound.
Roger D. Corneliussen is Professor Emeritus of Materials Engineering, Drexel University, in Philadelphia, Pennsylvania, USA. He is editor of Maro Polymer Alerts and the Maro Polymer website (www. maropolymeronline.com). He has been active in SPE since 1962 and has served on the Board of the Philadelphia Section and as SPE Councilor. For Maro Patent Alerts, he reviews all U.S. Patents weekly, makes links to the polymer-related patents, and sends the links daily to subscribers. These patent abstracts are based on the weekly selection process. To sample Maro Patent Alerts, email a request to email@example.com.