Yeda Research and Develpment & Co. Ltd

Xerox Corporation

The State University of New York

Moshe Levy

David Vofsi

Stephen L Daren

Dan Fraenkel

Ella Cohen

Margaret Cherniavsky

Thomas R Hoffend

Franklin D Saeva

David J Williams

Israel Cabasso

James M Pearson

Stephen Strella

Reuben Farber

Baruch Ittah

Shaul A Gassner

A method of selective beta-alkylation of aromatic substrates such as naphthalene or a derivative thereof, comprising reacting the substrate with an alcohol or olefin alkylating agent in the presence of a catalyst selected from the group consisting of a crystallized borosilicate glass zeolite and a crystalline alumina-silica catalyst, said catalyst being at least 86% beta selective with respect to the alkylation of naphthalene by the alkylating agent.

Catalysts and process for the production of hydrocarbons and

A membrane of defined pore structure and controlled pore diameter and a method of preparing the membrane which comprises dispersing in a water soluble polymer solution (A) an organic polymer solution (B), the water-soluble polymer solution (A) being a non-solvent for the polymer solution (B), to form micro-spherical droplets of the polymer solution (A) which are enveloped by a solid phase consisting of a coagulated or cross-linked polymer solution (B); evenly casting the dispersion on a flat surface; and evaporating the solvent for the polymer solution (B) to form a microporous membrane comprised of the polymer (B), the porosity, pore size, and void volume of the microporous membrane being a function of the polymer (A) concentration, the microsphere dimensions and the temperature and evaporation rate. The water-soluble polymer (A) is selected from polyethyleneimine, gelatin, polyvinyl-pyrrolidone, polyvinyl pyridinium halide, polyacrylic acid, polyhydroxyethylmethacrylate (HEMA), dextran, or polyvinyl acetate. The continuous phase polymer (B) is selected from a brominated polyphenylene oxide, polyphenylene oxide, polyacetic acid, polystyrene, polyglycol acrylate (PGA), polymethylmethacrylate, cellulose acetate, polyvinyl acetate, polycarbonate and polyvinylidene fluoride.

Preparation of porous substrates having well defined morphology

Crystallized borosilicate glass zeolites prepared from a PYREX/template reaction system exhibit high para-selective and beta-selective catalytic activity in the respective alkylations of benzene, naphthalene, and derivatives thereof. A PYREX/tetraalkylammonium hydroxide system for alkylation of toluene with C.sub.1 -C.sub.3 -alkanols is exemplary.

Para-selective and beta-selective crystallized glass zeolite alkylation

There is provided a tendon prosthesis comprising in combination an essentially tubular core of physiologically acceptable and mechanically strong fabric, embedded in a flexible polymer, which member is provided with a surrounding woven sleeve of a biodegradable fabric, said inner fabric core being exposed at both ends for attachment to the bone and muscle, and a process for the production of same which comprises stretching a knitted dacron strip to form an elliptical cross-section member, longitudinally open, embedding it in polymerizable silicon monomer, polymerizing same, weaving around same a sleeve from biodegradable filaments, and closing the sleeve at the two ends around exposed dacron core.

Prosthetic tendon

This invention relates to a process for substantially eliminating polymerization inhibition in a pigment containing dispersion polymerization reaction, which comprises grafting polymer molecules onto the pigment used in the polymerization reaction, whereby there results a polymerized product which contains essentially no monomer material.

Toner pigment treatment process for reducing the residual styrene

A process for the simultaneous production of bromostyrene or dibromostyrene and of an alkyl bromide, which comprises reacting bromoethyl bromobenzene or bromoethyl dibromobenzene with an alkanol at an elevated temperature. When only these reactants are reacted, the temperature is between 400.degree.C and 550.degree.C; when the reaction is effected in the presence of a source of free radicals, the temperature used can be lower, and temperatures of about 300.degree.C are adequate.

Production of bromostyrene, dibromostyrene and alkyl bromides

A process for the production of mono-, di-, and/or tribromostyrene which comprises reacting .beta.-bromomethyl-mono-, di- and/or tribromobenzene at a temperature between 280.degree.C to 470.degree.C in the presence of a free radical source and either a lower alkanol or water.

Production of bromostyrenes

Ambipolar photoconductive composition comprising the product of the in situ polymerization of at least one cyclic compound of the formula: ##EQU1## wherein Ar is a polyaromatic nucleus selected from the group consisting of diradicals of naphthalene, anthracene, pyrene and carbazole;

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Rehovot, Israel

Moshe Levy