Abstract: Improved process for vapor phase cracking of dicyclopentadiene and synthesis of 2,3-dihydrodicyclopentadiene therefrom. Initially, a feedstock consisting essentially of dicyclopentadiene and cyclopentene is subjected to thermocracking in the vapor phase, resulting in the conversion of dicyclopentadiene to monomeric cyclopentadiene. The presence of cyclopentene in the feed stock is believed to minimize coke formation on the interior walls of the cracking chamber. Subsequent selective catalytic hydrogenation of the resulting mixture converts substantially all of the monomeric cyclopentadiene to cyclopentene. The cyclopentene, prepared in the above manner, can be combined with additional quantitie;s of dicyclopentadiene and the resultant mixture subjected to dimerization in the liquid phase at elevated temperatures, thereby forming the monomer, 2,3-dihydrodicyclopentadiene.

Abstract: Method for extending the useful life of polymers which are sensitive to photodegradation by ultraviolet light. In this method, the resistance of UV sensitive polymers is enhanced by the incorporation therein of an ultraviolet light stabilizer effective amount of at least one compound of the formula ##STR1## WHEREIN R.sub.a, R.sub.b, R.sub.d, and R.sub.e are independently selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms, cycloalkyl, and aryl; and R.sub.c is hydrogen or hydroxyalkyl.

Abstract: 2. An article of manufacture useful as a gas generator and comprising a container having an outlet and supported and adapted to burn within said container and adhered to the walls of said container a mixed, shaped and cured composition of matter characterized by generating large volumes of gas on combustion and, except for minor amounts of compounding ingredients, consisting essentially of from about 70 to 87% by weight of finely-divided dried ammonium perchlorate, from about 0.5 to 5.

Abstract: Process for preparation of monomers of the formula ##STR1## wherein R is hydrogen or methyl;X and Y are independently selected from the group consisting of NO.sub.2, halogen, --CN and --CF.sub.3 ; andm and n can range from 0 to 3.Typical monomers embraced by the above formula can be prepared by Lewis Acid catalyzed esterification of methacrylic acid with a diazo derivative of an electron acceptor such as 9-diazo-2,4,7-trinitrofluorenone. These monomers can be used with other binders or polymerized by standard, free-radical techniques to polymers capable of forming self-supporting films which are useful in electrophotographic imaging members and methods.

Abstract: An electrophotographic plate is described comprising a charge-transfer complex of an aromatic resin and certain Lewis acids; typically 9-dicyanomethylene-2,4,7-trinitro-fluorene. Also described are methods of preparing and using this plate.

Abstract: A portable camera having the photosensitive member including an electrically conductive supportive substrate, a photoconductive layer overlying the substrate, and a leaky dielectric film overlying the free surface of the photoconductive layer. This camera is also provided with an electrically biased pad for contact charging of the photosensitive member and means for development of the photosensitive member within the camera subsequent to latent-image formation. Fixation of the developed image is achieved by overcoating said image with a permanent film or coating.

Abstract: Composite photoconductive insulating films comprising a thin layer of photoconductive materials having substantial spectral response in the visible region of the electromagnetic spectrum and a substantially colorless insulating layer contiguous therewith comprising a minor portion of electronically inert binder in a major portion of an electronically active oligomer of the formula: ##STR1## R' is hydrogen or methyl; R" is alkyl of 1-10 carbon atoms;X and Y are independently selected from the group consisting of NO.sub.2, halogen, cyano and --CF.sub.3 ;Z is oxygen or dicyanomethylene;a and a' can range from 0-3;m is 1-10; andn is in the range of from about 3 to about 25.

Abstract: Disclosed are monomers of the formula: ##STR1## WHEREIN R is ##STR2## R' is hydrogen or methyl; R" is alkyl of 1-10 carbon atoms;X and Y are independently selected from the group consisting of NO.sub.2, halogen, cyano and --CF.sub.3 ;Z is oxygen or dicyanomethylene;a and a' can range from 0-3; andn is 1-10.These monomers can be readily polymerized to polymers suitable for use in electrophotographic imaging members and methods.

Abstract: An electronic halftoning image reproduction system wherein a halftone screen function is combined with pictorial information, typically by addition, to provide a sum function. In a second channel the pictorial signal is averaged over the area corresponding to one period of the halftone screen function and the average is utilized to determine the percent of the area to be turned white within that halftone dot. This is accomplished by thresholding the sum function with a dynamically adjusted threshold for each period of the halftone dot such that the percentage of white matches the average pictorial signal. In another embodiment wherein the desired gray scale of the reproduction is different from that of the original image, the average pictorial signal may be adjusted in some predetermined manner and the percentage of white is matched to the adjusted signal.

Abstract: Disclosed are electron acceptor monomers of the formula: ##STR1## R' is hydrogen or methyl; X and Y are independently selected from the group consisting of --NO.sub.2, halogen, cyano and --CF.sub.3 ;Z is oxygen or dicyanomethylene; anda and b can range from 0 to 3;With the proviso that at least one of R is ##STR2## AND POLYMERS PREPARED THEREFROM. These monomers and polymers are suitable for use in electrophotographic devices and methods.

Abstract: An imaging or transfer roller comprising mechanism to couple the roller to a ground potential close to the imaging or transfer zone, is provided. The roller includes insulator members concentric with the roller shaft and conductive sleeves on the ends of the roller.

Abstract: Process for preparation of transparencies from a solid phase dispersion of photoconductive particles in an insulating binder matrix. In this process, a dispersion is initially formed from an insulating polymer resin and an organoselenium compound capable of undergoing selective decomposition in response to an appropriate stimulus, whereby elemental selenium is extruded from said organoselenium compound and deposited within the polymeric resin. As a result of this deposition of elemental selenium within the insulating layer, the layer is rendered photoresponsive and can be used in conventional electrophotographic processes. Subsequent to the development and fusion of a developer image on this imaging member, the extrusion/deposition reaction can be reversed and the selenium deposit erased thus leaving a toner image fused to a substantially transparent polymeric film.

Abstract: A xeroprinting master capable of preparation of multiple copies of an original without reimaging and without permanent modification of the master itself. This xeroprinting master consists essentially of a conductive base member, a non-persistent photoconductive insulating layer, a persistent photoconductive insulating layer and a dielectric layer; these layers being arranged relative to one another in the order of their listing. A latent electrostatic image can be created upon the surface of the dielectric layer by initially exposing the persistent photoconductive insulating layer to an image pattern, sensitizing the surface of the dielectric layer in the dark by charging to a constant surface potential, followed by blanket exposure of the non-persistent photoconductive insulating layer; the wavelength of light used in blanket exposure of the non-persistent photoconductive insulating layer being substantially non-activating of the persistent photoconductive insulating layer.

Abstract: Photoconductive composition comprising an insulating polymeric matrix and a compound of the formula ##STR1## wherein R is --H or --CN;R', r", r'" and R.sup.iv are independently selected from an aliphatic hydrocarbon radical having from about 1-10 carbon atoms; phenyl; or substituted phenyl wherein said substituents are capable of releasing electrons to relatively electron deficient centers within the compound; amino; diarylamino; dialkylamino or alkoxy; n can range from 0 up to the potential number of positions of substitution on the aromatic ring system.These compositions have good spectral response in the visible region of the electromagnetic spectrum and are suitable for use in electrostatographic imaging members and methods.

Abstract: Process for preparation of monomers of the formula ##STR1## WHEREIN R is hydrogen or methyl;X and Y are independently selected from the group consisting of NO.sub.2, halogen, --CN and --CF.sub.3 ; andm and n can range from 0 to 3.Typical monomers embraced by the above formula can be prepared by Lewis Acid catalyzed esterification of methacrylic acid with a diazo derivative of an electron acceptor such as 9-diazo-2,4,7-trinitrofluorenone. These monomers can be used with other binders or polymerized by standard, free-radical techniques to polymers capable of forming self-supporting films which are useful in electrophotographic imaging members and methods.

Abstract: Process for preparation of 2-anthryl and substituted 2-anthryl functional monomers and polymers. In the process for preparation of these monomers, an anthracenic reactant of the formula: ##STR1## wherein X and Y are independently selected from hydrogen, chlorine, bromine, alkyl of 1 to 4 carbon atoms or phenylIs acylated in nitrobenzene under conditions which favor reaction at the two position. The resulting acylated product can then be (a) reacted with an alkylidenephosphorane (Wittig synthesis) or (b) reduced to the corresponding alcohol. Subsequent to such reduction, this alcohol can undergo further modification at the hydroxyl function to form a polymerizable addition monomer.

Abstract: An improved electrophoretic development method comprising providing a liquid developer system having a backing electrode and a developer electrode, wherein the development electrode comprises a plurality of individually biased electrodes. According to this improved method, as an electrostatically imaged insulating member is contacted with the liquid developer and directed through a development zone defined by said electrodes, the leading edge of said insulating member selectively activates the individually biased development electrodes in synchronization with the travel of the insulation member through said zone, and the trailing edge of said insulating member selectively inactivates the individually biased development electrodes upon the withdrawal of the insulating member from said zone. This method is especially suitable for preparation of reversal images by electrophoretic development.

Abstract: Photoconductive compositions comprising an organic photoconductive material, an activator capable of forming a charge transfer complex with the photoconductive material, and a protonic acid. Imaging members provided with an imaging layer prepared from the above composition are highly light sensitive, requiring only brief exposure times, and exhibit a photoinduced state of elevated conductivity which persists long after exposure to light is terminated. These compositions can be returned to their relatively insulative state by merely subjecting the imaging layer to heat in the dark, thereby erasing this photoinduced image pattern of elevated conductivity.

Abstract: Photosensitive composition for use in photoelectrophoretic imaging system. The particulate component of this composition includes vanadyl phthalocyanine pigment particles which have been treated with a polymer having structural units of the formula ##STR1## WHEREIN Z is a pendant group of the formula ##STR2## X is a substituent substantially incapable of withdrawing electrons from the electron rich pyridinyl moiety;M is a whole number from 0 to 3; andN is a whole number in excess of 25.The intimate association of at least some of the polymer with at least some of the vanadyl phthalocyanine pigment is believed to effectively attenuate photoinjection of holes from the phthalocyanine pigment into the surrounding materials thereby both reducing the D.sub.min of the phthalocyanine pigment; and, to improve color separation of reproductions prepared by processes employing a subtractive color system.

Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.