Abstract: An ink jet ink especially for printing on to plain paper comprises a suspension in (a) non aqueous solvent of (b) a disperse phase comprising: (i)) a water-insoluble dyestuff which is insoluble in said solvent at the ink jet operating temperature and below; (ii) a water insoluble resinous dispersant for the dyestuff which in the amount used is capable of forming a solution in the said solvent at the ink jet operating temperature, (iii) a polymer binder to hold the dyestuff on the surface of the paper.

Abstract: A method of operating a pulsed droplet deposition apparatus, e.g. a drop-on-demand ink jet printer, having a droplet liquid chamber (16) with which a nozzle (18) communicates for expulsion of droplets (12) from the chamber, droplet liquid replenishment means (20) connected to the chamber and energy pulse applying means for imparting pulses of energy to the droplet liquid in the chamber, employs, to increase the volume of droplets expelled by respective energy pulses, a droplet liquid having high viscosity at low shear rate and low viscosity at high shear rate, the liquid relaxation time constant being of the same order or greater than the period of pulses applied to the liquid and the characteristic time of the liquid in the nozzle being of the same order or less than the period of the pulses.

Abstract: A recording transparency and method of preparing the same from water solution are disclosed. The transparency is receptive to a wide variety of inks and other indicia, exhibits rapid ink drying times, excellent dot size and shape retention, and excellent water resistance and stability. The transparency comprises a transparent substrate coated from an aqueous solution of a polymeric sorbent selected from synthetic transparent cellulosic polymers, especially one or a mixture of hydroxyethyl cellulose polymers, and a surfactant composition comprising nonionic detergent, anionic detergent and complexing agent.

Abstract: An ink jet composition and method of printing on plain paper are provided wherein the composition comprises a colloidal solution of a nonaqueous solvent (e.g. selected glycol ethers) and a disperse phase comprising a resin (e.g. a selected ethylene-vinyl acetate copolymer) which is soluble in the solvent at room temperature and a dyestuff which is soluble in the resin at room temperature but substantially insoluble in the solvent at room temperature. The ink composition is fluid and may have a very low viscosity at room temperature.

Abstract: An ink jet ink composition and method of printing on plain paper are provided wherein the composition comprises a mixture of a nonaqueous solvent (e.g. selected glycol ethers), a resin (e.g. an ethylene-vinyl acetate copolymer) which is substantially completely soluble in the solvent at elevated operation temperatures but substantially insoluble in the solvent at room temperature and a dyestuff which is soluble in the resin at room temperature and above but substantially insoluble in the solvent at room temperature. The ink composition is fluid at room temperature, and has very low viscosity at elevated operating temperatures.

Abstract: Jet printing ink compositions characterized as having low volatility, low viscosity and low variation of viscosity with respect to temperature are disclosed. The compositions comprise a coloring agent dissolved or dispersed in a liquid vehicle which is preferably substantially free of added water and is a propylene glycol ether or an ethylene glycol butyl ether in which the coloring agent is soluble or dispersible.

Abstract: An ink jet ink composition useful for printing on plain paper at room temperature comprises a colloidal suspension of a nonaqueous solvent (e.g. selected glycol ethers) and dispersed particles comprising a natural resin or synthetic polymer which is insoluble in water but soluble in the solvent at room temperature, and a dyestuff which is soluble in or bindable to the resin or polymer at room temperature but substantially insoluble in the solvent at room temperature. The ink composition is fluid and has a low viscosity at room temperature.

Abstract: This invention discloses a new ferrofluid and the use of ferrofluids in magnetically controllable couplings such as electromagnetic clutches and brakes. The new ferrofluid is comprised of a stable suspension of magnetizable particles having a size of at least one micron, a fluid carrier and a complexing agent. The complexing agent maintains the magnetizable particles in suspension within the carrier fluid.

Abstract: Coated paper useful for ink jet printing comprises a cellulosic substrate coated with an intimate mixture of a particulate pigment with a binder comprising a mixture of an acrylic resin and polyvinyl alcohol.

Abstract: This invention disclosed a new ferrofluid and the use of ferrofluids in magnetically controllable couplings such as electromagnetic clutches and brakes. The new ferrofluid is comprised of a stable suspension of magnetizable particles having a size of at least one micron, a fluid carrier and a complexing agent. The complexing agent maintains the magnetizable particles in suspension within the carrier fluid.

Abstract: This document discloses the use of reduced heteropoly acids as additives to absorbing material to impart reduced infrared reflectivity or transmission thereto. The reduced infrared reflectivity is especially suitable for use in inks for reading bar coded and optical character reader mail by a special sensing device wherein the infrared portion of the spectrum is betwen about 700 and 1000 nanometers. It is also useful in plastics, aqueous solutions, photographic screens, and paints.

Abstract: A process is disclosed for applying an adherent, optically clear, abrasion resistant coating to plastic ophthalmic substrates such as plastic lenses. The process includes: (a) forming a partially hydrolyzed solution of a vinyltri(lower alkoxy)silane, such as vinyltriethoxysilane, in a water-miscible, volatile, organic solvent, the silane being present from 25-75% by weight; (b) applying a thin, uniform coating of the partially hydrolyzed solution to a clean surface of the ophthalmic lens; (c) maintaining the coated substrate in a high humidity and preferably elevated temperature environment until the silane is substantially completely hydrolyzed; and, (d) dehydrating the coated substrate under low humidity conditions at an elevated temperature below the temperature at which the substrate degrades until an adherent, abrasion resistant coating is formed. Plastic lenses and other ophthalmic plastic components coated according to the above process are also described.