Abstract: Polyolefins may be prepared using a cocatalyst conforming to the formula: AIRz(Xz)nLzm wherein Rz is a linear or branched organic moiety having at least 5 carbons and Xz is a linear or branched organic moiety having at least 5 carbons or a heterocyclic moiety having at least 4 atoms and can be anionic or di-anionic. The aluminum complex may also be in the form of an adduct complex where Lz is a Lewis base and m=1-3. The cocatalyst Rz components are selected such that they do not react with water under polymerization conditions to form a species that is highly soluble in the polymerization diluent. Use of the specified cocatalyst reduces fouling during metallocene-catalyzed runs and “post-metallocene hangover” when the same production equipment is transitioned to non-metallocene catalyst runs using catalysts such as chromium.

Abstract: Irregularities in the pore structures of polyacrylamide gels that are formed in cassettes against plastic walls are reduced or eliminated by the inclusion of an oxygen scavenger in the gel-forming solution. Avoidance of the irregularities results in electropherograms with fewer distortions in the solute bands.

Abstract: An electrophoretic display material and apparatus is disclosed, including a dispersion medium, a white particulate material having a volume median particle diameter Dw, and a colored particulate material having a color different from the color of the white particulate material and a volume median particle diameter Dc, and wherein a ratio Dc/Dw is from 1/1 to 1/50.

Abstract: The present invention relates to the production of high density polyethylene homopolymers or copolymers having a broad and monomodal molecular weight distribution wherein the polymerization process is conducted in the presence of supported metallocene-alumoxane catalysts wherein the metallocene is bridged, comprises at least a hydrogenated indenyl or fluorenyl and is isolated on its support under the form of all its conformers.

Abstract: The present invention provides a polymerizable monomer composition particle and a resin particle, both of which display a narrow particle diameter distribution. A process for producing a resin particle comprises the steps of: passing two liquids through a static type in-line mixer having a liquid-dividing mechanism standing in a static state, wherein the two liquids are formable into two phases including one of the two liquids as a dispersing phase component and the other as a continuous phase component; then passing the two liquids through a high speed shearing type dispersing machine having a liquid-shearing mechanism which revolves at a high speed, thus dispersing a fine liquid drop of the dispersing phase component into the continuous phase component; and forming a resin particle from the resultant liquid drop.

Abstract: A dehydrated reconstitutable polyacrylamide material for use as a polyacrylamide gel sample in electrophoretic analysis is provided. The dehydrated reconstitutable material includes a stabilizer material and excludes a buffer salt. The dehydrated reconstitutable polyacrylamide material is storable at ambient temperature without substantial loss of potency for at least about 120 days.

Abstract: Polymer particles which are substantially spherical and have protrusions on the surface thereof, with such a particle size distribution that the volume mean diameter dv thereof is 1.ltoreq.dv.ltoreq.15 (.mu.m), and the ratio of the volume mean diameter dv to the number mean diameter dn thereof, that is, dv/dn, is 1.ltoreq.dv/dn.ltoreq.1.2, are prepared, and used as a component for a toner for use in electrophotography.

Abstract: Electrophoresis support media which include one or more polymers made from hydroxy alkyl esters of acrylic or methylacrylic acid or poly (alkylene glycol) esters of acrylic or methacrylic acid. These acrylic or methacrylic monomers are polymerized or copolymerized to form electrophoresis support media which can be used in place of polyacrylamide gels, agar gels and agarose gels. The acrylic or methacrylic ester monomers may be cross-linked with various cross-linking agents to provide electrophoresis support media with a wide range of pore sizes and physical strength. The electrophoresis support media is well-suited for use with organic solvents.

Abstract: Electrophoresis support media which include one or more polymers made from hydroxy alkyl esters of acrylic or methylacrylic acid or poly (alkylene glycol) esters of acrylic or methacrylic acid. These acrylic or methacrylic monomers are polymerized or copolymerized to form electrophoresis support media which can be used in place of polyacrylamide gels, agar gels and agarose gels. The acrylic or methacrylic ester monomers may be cross-linked with various cross-linking agents to provide electrophoresis support media with a wide range of pore sizes and physical strength. The electrophoresis support media is well-suited for use with organic solvents.

Abstract: A toner resin contains a specific polymer as its principal component. The polymer is obtained by mixing 20-80 parts by weight of a low molecular polymer having a number average molecular weight of 1,000-5,000 and a glass transition temperature (Tg) of 40.degree.-75.degree. C., 80-20 parts by weight of a vinyl monomer, 0.01-5 parts by weight of a polymerization initiator and 0-3 parts by weight of a crosslinking agent, dispersing the resultant mixture in an aqueous system and then polymerizing same. The toner resin has excellent low-temperature fixing property and offsetting resistance, can provide marks of superb vividness, and also can prevent modifications of copied marks, for example, due to transfer of a plasticizer.

Abstract: A developer for an electrostatic latent image is disclosed, which comprises a carrier powder, a toner powder, and a fine powder that has a particle size smaller than that of the toner powder said fine powder being made of a polymer which is located closer to the carrier side of the triboelectric series than to the toner side. The developer does not cause insufficient cleaning or toner filming on a photoreceptor or electrostatic recording element.

Abstract: Disclosed is a carrier and developer composition, and a process for the preparation of carrier particles with substantially stable conductivity parameters which comprises (1) providing carrier cores and a polymer mixture, (2) dry mixing the cores and the polymer mixture, (3) heating the carrier core particles and polymer mixture, whereby the polymer mixture melts and fuses to the carrier core particles; and (4) thereafter cooling the resulting coated carrier particles.

Abstract: A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Abstract: A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Abstract: A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Abstract: The present invention provides a developer for developing electrostatic latent image which comprises capsule toners and carriers; said capsule toner having many wrinkles or hollows and upheavals and containing liquid in a shell, and the carriers have no sharp edge or a lower specific gravity, the image copied by the developer can be fixed by pressure under low temperature.

Abstract: The present invention provides a capsule toner having many wrinkles or hollows and upheavals and containing liquid in a shell, which is useful for toner for pressure fixation.

Abstract: Electrophotographic toner is provided which contains 30-80% by weight of a polymer per total weight of a resin included in the toner, said polymer is obtained by continuously feeding a vinyl monomer, a polymerization initiator and a solvent into a system of 190.degree.-230.degree. C. to conduct polymerization under a liquid state, and said polymer is a vinyl polymer having a number average molecular weight of 1,000-5,000 and a glass transition temperature of 40.degree.75.degree. C. The preparation method of the electrophotographic toner is also provided. The toner is excellent in the fixing ability at high duplication speed and lower temperatures.

Abstract: A toner for developing an electrostatic latent image containing a polyester resin binder obtained by condensation polymerization of a diol component and a mixture of acid components. The acid components are an aliphatic unsaturated dicarboxylic acid or an acid anhydride thereof and a polybasic carboxylic acid having not less than three carboxylic acid groups or an acid anhydride thereof. A ratio of the polybasic carboxylic acid having not less than three carboxylic acid groups or the acid anhydride thereof to the total acid components is in the range of from 5 mol % to less than 30 mol %.

Abstract: Disclosed is an electrophotographic magnetic toner comprising 40-80% binder resin, a waxy material such as a low molecular weight polypropylene or polyethylene, a charge control agent and 20-60% iron oxide having a number average particle size of 0.2-0.7 microns and wherein trivalent Fe is present in excess and wherein the iron oxide contains 16-25% FeO and about 75-84% Fe.sub.2 O.sub.3.

Abstract: A magnetic toner for developing electrostatic images, comprising at least a binder resin and a magnetic powder; the binder resin having 10 to 70 wt. % of a THF (tetrahydrofuran)-insoluble and a THF-soluble, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that it provides a rate (Mw/Mn) of weight-average molecular weight (Mw)/number-average molecular weight (Mn).gtoreq.5, there are a peak in the molecular weight range of 2,000 to 10,000 and a peak or shoulder in the molecular weight range of 15,000 to 100,000 and a component having a molecular weight of 10,000 or smaller is contained in an amount of 10-50 wt. % based on the binder resin; the magnetic powder comprising spherical magnetic particles having a bulk density of 0.6 g/ml or larger.

Abstract: A carrier composition comprised of a core with a coating thereover comprised of a mixture of first and second polymers that are not in close proximity thereto in the triboelectric series.

Abstract: A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene having a number average molecular weight of about 3000 to 4000 in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Abstract: A toner for electrophotography containing as a binder a polymer comprising as essential ingredient a high-molecular-weight monofunctional monomer having a weight average molecular weight of 1,000 to 50,000 and an ethylenic double bond only at one end of the molecular chain is excellent in fixing properties in a heat roll fixing process and anti-offset properties.

Abstract: A process for producing an electrophotographic toner in one step by suspension polymerization of monomers capable of forming a fixing resin. In a first embodiment, the suspension polymerization is carried out in the presence of a specific suspension stabilizer and a radical polymerization initiator. In a second embodiment, the suspension polymerization is carried out while applying ultrasonic radiation of a fixed frequency. The process gives a toner having a uniform particle size distribution.

Abstract: A method for producing solid polymers having a molecular weight greater than 50,000 from olefins wherein the olefin is polymerized in the absence of a liquid dispersion agent of a nature different from that of the olefin to be polymerized, and in contact with a prepolymer containing a small amount of transition metal of subgroups IV-b, V-b and VI-b having been produced by the polymerization of an olefin in a dispersion liquid containing a Ziegler-type catalyst.