Celanese Gmbh

Exxon Research and Engineering Company

Hoechst Celanese Corporation

Arizona Board of Regents on Behalf of the University of Arizona

Henry K Hall

Eui W Choe

Anthony B Conciatori

Donald R Wilson

Stanley J Brois

Warren A Thaler

Anne B Padias

Nasser N Peyghambarian

Bernard Kippelen

Klaus Meerholz

(nfn) Sandalphon

Boris L Volodin

Scott R Lyon

Tun F Way

A photorefractive (PR) device comprises of a layer of a novel photorefractive polymer composite sandwiched inbetween two transparent electrodes. The PR polymer composite comprises a photoconducting polymer, a photosensitizer, a novel second-order, non-linear optical chromophore, and a plasticizer in an amount sufficient to provide the PR polymer composite with a glass transition temperature below about 45.degree. C. The PR polymer composite is capable of internally storing image patterns generated by interfering two coherent light beams inside the material. The PR polymer composite shows high diffraction efficiencies (near 100%) and high net two-coupling gain (&gt;200 cm.sup.-1). The writing of information is reversible. Consequently, the device is suitable for read/write holographic storage and real-time image processing applications, and is capable of being poled at essentially room temperature. The light source is an integrated semiconductor laser and the detector is a commercial Si photodiode or a CCD camera.

Azo-dye-doped photorefractive polymer composites for holographic testing

This invention provides novel polymers containing alkyl vinylidene cyanide moieties that exhibit nonlinear optical and piezoelectric properties. The polymers have utility as media in optical devices. An invention polymer is illustrated by the copolymer of the following structure: ##STR1##

Alkyl vinylidene cyanide polymers exhibiting nonlinear optical and

A sulfone adduct which comprises the reaction product of: ##STR1## and an unsaturated hydrocarbon polymer wherein X is an alkyl group selected from the group consisting of C.sub.n H.sub.2n +1, wherein n=1 to 18; X is an aryl group selected from the group consisting of C.sub.m H.sub.m-1 wherein m=6 and C.sub.m H.sub.m-2 Z wherein m=6 and Z is selected from the group consisting of OR', R', COOR'', NO.sub.2, Cl, Br, F and I where R', R' and R'' having about 1 to about 18 carbon atoms; wherein said unsaturated hydrocarbon polymer is selected from the group consisting of ethylene propylene terpolymers, ethylene diene copolymers, propylene diene copolymers, polyisoprene, butyl rubber, polybutadiene and styrenebutadiene, and styrene-isoprene random and block copolymers, polypropylenes and polyisobutylenes.

Solution of oil and sulfone adduct

Sulfonomaleation of organic molecules and polymers

Acrylate and methacrylate monoesters of pentaerythritol and pentaerythritol orthoesters are provided. These orthoesters are especially useful as monomers for the preparation of polymers and copolymers having a variety of industrial applications.

Acrylate and methacrylate monoesters of pentaerythritol and

This invention provides an improved type of high molecular weight polybenzimidazole, which involves the use of a phosphorus-containing polymerization catalyst. The process provides poly-2,2'-(m-phenylene)-5,5'-bibenzimidazole of improved color and plugging value, and is further characterized by an inherent viscosity of at least about 0.7 dl/g, and a weight average molecular weight of at least about 100,000.

High molecular weight polybenzimidazoles

This invention provides a single stage melt polymerization process for the production of an improved type of high molecular weight polybenzimidazole, which involves the use of a phosphorus-containing polymerization catalyst. The process provides poly-2,2'-(m-phenylene)-5,5'-bibenzimidazole of improved color and plugging value, and is further characterized by an inherent viscosity of at least about 0.7 dl/g, and a weight average molecular weight of at least about 100,000.

High molecular weight polybenzimidazole preparation with phosphorus

In the two stage reaction of terephthalic acid with 1,4-butanediol to produce polybutylene terephthalate in which acid and diol are first subjected to catalytic esterification/oligomerization and the resulting products are thereafter subjected to catalytic polycondensation, the co-production of tetrahydrofuran is significantly reduced by conducting the polycondensation reaction prior to completion of the esterification/oligomerization reaction.

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Tucson, AZ, United States of America

Henry K Hall