Abstract:
This invention relates to a conductive single component magnetic dry toner comprised of resins selected from polystyrene allyl alcohol copolymers, and epoxy resins, a magnetic material such as magnetite, and a conductive carbon black which is adhered and/or embedded on the surface of the copolymer or epoxy resin-magnetic material mixture. Such toner compositions, which have excellent conductivity, superior flow properties and low melt fusing temperatures, 95.degree. C.-130.degree. C., are useful for causing the development of images in commercial printers and recorders such as the Versatec printers.
Abstract:
This invention relates to improved positively charged toner compositions for use in developing electrostatic images contained in electrostatographic imaging devices wherein fusing is accomplished with a fuser roll fabricated from lead oxide and a vinylidene fluoride hexafluoropropylene copolymer, which composition is comprised of resin particles, pigment particles, and as the charge enhancing additive present in an amount of from about 0.1 percent by weight to about 10 percent by weight, a pyridinium tetrafluoroborate of the following formula: ##STR1## wherein R.sub.1 is an alkyl group containing from about 1 carbon atom to about 22 carbon atoms, and R.sub.2 is an alkyl group containing from about 1 carbon atom to about 8 carbon atoms, or a halogen, and n is zero or 1.
Abstract:
This invention is generally directed to an improved positively charged dry electrostatic toner composition comprised of resin particles, pigment particles, a low molecular weight waxy material having a molecular weight of from 500 to about 20,000, and from about 0.5 percent to about 10 percent by weight of a charge enhancing additive selected from the group consisting of alkyl pyridinium halides, organic sulfonate compositions and organic sulfate compositions, of the following formulas: ##STR1## wherein R is a hydrocarbon group containing about 8 to about 22 carbon atoms, and A is an anion, and ##STR2## wherein R.sub.1 is an alkyl group containing from about 12 carbon atoms to about 22 carbon atoms, R.sub.2 and R.sub.3 are independently selected from alkyl groups containing from about 1 carbon atom to about 5 carbon atoms, R.sub.4 is an alkylene group containing from about 1 carbon atom to about 5 carbon atoms, R.sub.5 is a tolyl group or an alkyl group containing from about 1 carbon atom to about 3 carbon atoms, and n is the number 3 or 4.
Abstract:
An improved conductive single component magnetic dry toner composition for use in developing images in electronic printing systems of a conductivity of from 10.sup.-6 to 10.sup.-8 (ohms/cm).sup.-1, and a fusing temperature of from about 95 degrees Centigrade to about 130 degrees Centigrade, and comprised of a magnetic material present in an amount of from about 40 percent by weight to about 80 percent by weight, and from about 20 percent by weight to about 60 percent by weight of a polyester resin, comprised of the polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol of the formula: ##STR1## wherein R is selected from substituted and unsubstituted alkylene radicals containing from about 2 to about 12 carbon atoms, alkylidene radicals containing from 1 to about 12 carbon atoms, and cycloclkylidene radicals containing from about 3 to about 12 carbon atoms; R' and R" are selected from substituted and unsubstituted alkylene radicals containing from about 2 to about 12 carbon atoms, alkylene arylene radicals containing from about 8 to about 12 carbon atoms and arylene radicals; X and X' are selected from hydrogen or alkyl radicals containing from 1 to about 4 carbon atoms; and each n is a number of from 0 (zero) to 4, a conductive carbon black present in an amount of from about 0.5 percent to about 4 percent, which carbon black is adhered to or embedded in the surface of the polyester magnetic mixture.
Abstract:
This invention relates to a process for rapidly charging uncharged toner particles to a positive polarity, which comprises adding uncharged toner particles to a positively charged developer composition comprising carrier particles and toner particles, the charged and uncharged toner particles containing conductive particles or conductive patches on their surface, which conductive patches are of a higher positive triboelectric charge than the toner polymer, contacting the charged toner particles with the uncharged toner particles causing positive charges to be transferred from the conductive particles on the charged toner particles, to conductive particles on the uncharged toner particles, within a period of from about 5 seconds to about 2 minutes, thereby resulting in substantially the same level of positive charge intensity for both the original charged toner particles and the added toner particles, such charge intensity ranging from about 5 microcoulombs per gram to about 50 microcoulombs per gram.
Abstract:
There are described novel yellow compounds which are represented by the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.
Abstract:
A fuser member for use in an electrostatographic printing machine has at least one layer of an elastomer composition comprising a silicone elastomer and a mica-type layered silicate, the silicone elastomer and mica-type layered silicate forming a delaminated nanocomposite with silicone elastomer inserted among the delaminated layers of the mica-type layered silicate.
Abstract:
A process for the preparation of encapsulated toner compositions which comprises a core dispersion obtained by adding pigment to a monomer, and wherein the pigment is sterically stabilized with a block copolymer; dispersing the resulting core dispersion into an aqueous solution containing an emulsifier; adding thereto an aqueous solution containing a shell monomer; encapsulating the core dispersion by interfacial polymerization of said shell monomer; and heating to initiate a free radical polymerization of the core monomer.
Abstract:
A negative charged toner composition comprised of resin particles, pigment particles, and as a charge enhancing additive dithiolene complexes of the formulas of FIGS. 1,2,3 or 4, wherein X is selenium or sulfur, M is a metal, R is alkyl, Y is a cation, Z represents zinc, and n represents the valence of the cation and anion components.