摘要:
Disclosed is a process which comprises reacting a haloalkylated aromatic polymer with a material selected from the group consisting of unsaturated ester salts, alkoxide salts, alkylcarboxylate salts, and mixtures thereof, thereby forming a curable polymer having functional groups corresponding to the selected salt. Another embodiment of the present invention is directed to a process for preparing an ink jet printhead with the curable polymer thus prepared.
摘要:
A process for the preparation of conductive submicron polymeric particles which comprises mixing at least one monomer with a polymerization initiator, a crosslinking component, and a chain transfer component; adding thereto an AB type block copolymer; effecting bulk polymerization until from about 10 to about 50 weight percent of the monomer has been polymerized; terminating polymerization by cooling the partially polymerized monomer; adding thereto from about 1 to about 50 weight percent of a conductive filler, or conductive fillers, followed by mixing thereof; dispersing the aforementioned mixture of conductive filler or fillers, and partially polymerized product in water containing a stabilizing component to obtain a suspension of particles with an average diameter of from about 0.05 to about 1 micron in water; polymerizing the resulting suspension by heating; and subsequently optionally washing and drying the product.
摘要:
Disclosed is a dry toner composition which comprises a resin, hydrophilic silica particles having dyes covalently bonded to the particle surfaces through silane coupling agents, and a polymer having at least one segment capable of enhancing the dispersability of the silica particles in the resin and at least one segment capable of adsorbing onto the surface of the silica particles. In one embodiment, the polymer segment capable of adsorbing onto the surface of the silica particles is ionophoric and capable of complexing with a salt, thereby incorporating a toner charge control additive into the polymer.
摘要:
A toner composition comprised of resin particles selected from the group consisting of a semicrystalline polyolefin and copolymers thereof which a melting point of from about 50.degree. C. to about 100.degree. C., and pigment particles.
摘要:
Disclosed is an improved process for the preparation of a stable colloidal dispersion of a selenium tellurium alloy, which comprises providing a solution with a polymer therein; adding to the solution a selenium ester and a tellurium ester; and subsequently subjecting the resulting mixture to a reduction reaction by adding thereto a reducing agent whereby there is generated selenium tellurium particles of a diameter of from about 0.01 micron to about 0.3 micron in solution.
摘要:
This invention relates to improved catalysts for the polymerization of propylene and higher .alpha.-olefin in a high temperature solution process comprising (1) a beta amino carboxylic ester, (2) an aluminum trialkyl and (3) a transition metal halide. More particularly, this invention relates to catalysts for the catalytic high temperature solution polymerization of .alpha.-mono-olefins containing at least 3 carbon atoms to form solid, highly crystalline polymers. More specifically, the catalysts of the present invention produce polypropylene in a high temperature solution process at very high polymer to catalysts yields.
摘要:
There is disclosed a method for the preparation of a homogeneous physically stable colloidal elemental cobalt dispersion of colloidal cobalt particles having a size in the range of from about 10 Angstrom units to about 200 Angstrom units. The method comprises preparing a solution of a passive polymer in an inert solvent, and incrementally adding thereto a cobalt precursor, at a temperature at which the cobalt precursor will lose at least one ligand and become bound to the passive polymer and thermally decompose to produce elemental cobalt particles, the process being carried out in an inert atmosphere. Such dispersions may be used per se as catalysts, or may be used for the preparation of supported colloidal cobalt catalysts. The dispersions may also be used for the preparation of ablative optical recording media.
摘要:
A thermistor temperature sensor having non-linear electrical response characteristics with temperature, a material constant, beta, that varies with temperature, and providing an output signal indicative of the temperature desired to be measured is utilized herein. A time dependent signal having a configuration that offsets the non-linear temperature dependence of the sensor output signal is generated and compared to the sensor output signal. Whenever the sensor output at least equals that of the offsetting signal, a comparator generates an output signal that, after appropriate delay, is indicative of the actual temperature. The material "constant" of the sensor is maintained substantially constant over at least a substantial range of temperatures. Additionally or alternatively, the sensor is energized in such manner as to substantially eliminate self-heating induced variations in the sensor output signal.
摘要:
A system for controlling sequence and duration of the operational steps in processes such as vulcanization of a pneumatic tire is capable of operating under two basic modes or parameters. In one mode the operational steps are dictated by elapsed real time, while in the other mode, the operation can be dictated by elapsed cure equivalent factors. The desired length of each step or the cure, whether in time or cure equivalents, is set into an input program means. In the time mode, time generating circuitry provides an output proportional to elapsed time which output is displayed on a counter and electrically compared with the information in the input program means. When a match occurs, the time generating circuitry and displays are reset and the input program means directs the tire vulcanization press to perform the next sequential function. Also disclosed is circuitry which is capable of performing secondary functions such as extending the length of a step, as necessary. If it is desired to operate in the cure equivalent mode, a signal proportional to elapsed cure equivalents is developed by a cure equivalent generating circuitry which performs digital integration of the Arrhenius function. The input to cure equivalent generating circuitry can be a signal proportional to tire temperature developed by internal thermocouples or can be a signal which is directly proportional to the Arrhenius function as generated by a thermistor sensor.