摘要:
System for replenishing liquid developer in equipment, such as a printer, whereby the percent of toner solids is maintained at about 0.5 to 4% by weight based on the total weight of liquid developer, the system comprising at least one liquid toner concentrate vessel containing aggregates of thermoplastic resin particles, median particle size (volume weighted) greater than 15 .mu.m, and with 90% of the particles (volume weighted) not less than 30 .mu.m, composed of 50 to 100% by weight of particles and 0 to 50% by weight carrier liquid; a liquid vessel containing carrier liquid, means communicating each of said vessels with a dispersing vessel containing high shearing or high impact means wherein contents of the liquid toner concentrate vessel and the liquid vessel are supplied thereto and the resin particles are dispersed in the carrier liquid to form particles having a median particle size (volume weighted) of less than 15 .mu.m, and with 90% of the particles (volume weighted) less than 30 .mu.m in an amount of about 0.5 to 20% by weight of resin particles and about 99.5 to 80% by weight carrier liquid said dispersion being supplied and metered into the supply vessel containing original liquid developer to maintain the desired weight of solids. The system is useful in copying, proofing, etc., equipment, and the liquid developer is useful for making copies, proofs, lithographic printing plates and resists.
摘要:
A positive-working electrostatic liquid developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount;(B) thermoplastic resin particles having dispersed therein a quaternary ammonium compound which is substantially insoluble in the nonpolar liquid and is represented by the general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be the same or different and are hydrogen, alkyl of 1 to 40 carbon atoms, aryl of 6 to 30 carbon atoms, and any of the group R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be joined to form a 5 or 6 membered ring, and A.sup.- is an anion; and (C) a nonpolar liquid soluble ionic or zwitterionic charge director compound. The process of preparation of the electrostatic liquid developer is described. The liquid developers are useful in copying, color proofing including digital color proofing, lithographic printing plates and resists.
摘要:
A liquid developer is prepared from a liquid electrostatic developer concentrate comprising up to 80% toner solids and a surfactant. The liquid electrostatic developer concentrate may be prepared by preparing a liquid electrostatic developer containing up to 20% toner solids; subsequently adding a surfactant to the liquid electrostatic developer; and concentrating the liquid electrostatic developer. The surfactant permits the easy redispersion of the toner solids at the time of use.
摘要:
Process for the preparation of toner particles for electrostatic liquid developers, which upon fusing to paper have a gloss .gtoreq.10 units over the paper gloss comprising:(A) dispersing at least one thermoplastic resin, at least one pigment, and a hydrocarbon liquid having a Kauri-butanol value of greater than 120 such that the dispersion contains 10% or more by weight solids by means of particulate media whereby the moving particulate media creates shear and/or impact while maintaining the temperature for 5 to 180 minutes in the vessel at a temperature of at least 15.degree. C. above the point at which the resin is plasticized or liquified by the hydrocarbon liquid and below that at which the hydrocarbon liquid boils and the resin and/or pigment decomposes,(B) continuing dispersion of the resin, pigment and hydrocarbon liquid as in Step (A) while maintaining the temperature for 5 to 180 minutes in the vessel at least 5.degree. C. below the point to at least 10.degree. C. above the point at which the resin is no longer plasticized or liquified by the hydrocarbon liquid,(C) cooling the dispersion containing 10% or more by weight solids in said vessel to permit precipitation of the resin out of the dispersant, the particulate media being maintained in continuous movement during and subsequent to cooling whereby toner particles having an average particle size of 10 .mu.m or less are formed, and(D) separating the dispersion of toner particles from the particulate media.Electrostatic developers are prepared by the addition of a charge director compound. The liquid developers are useful for preparation of copies and proofs of various colors and result in images having a higher gloss.
摘要:
An electrostatic developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount; (B) thermoplastic resin particles, less than 30 .mu.m average particle size, a nonpolar liquid soluble ionic or zwitterionic charge director compound (C), and (D) a metal salt of a .beta.-diketone as described. The process of preparation of the liquid electrostatic developer is also described. The liquid developers of the invention are useful in copying, color proofing, including digital color proofing, lithographic printing plates and resists.
摘要:
A white pre-treatment composition and printing method using such pre-treatment composition are disclosed. Said white pre-treatment composition encompasses a liquid vehicle, a polyvalent metal salt, a latex resin and, at least, 8 wt % of a titanium dioxide particles dispersion. Also disclosed is an ink-set containing said white pre-treatment composition and, at least, an ink composition comprising a liquid vehicle and a colorant.
摘要:
Ink compositions and method of making the same are disclosed. A disclosed example ink composition includes a liquid vehicle, a colorant system and polyurethane vinyl hybrid latexes. Also disclosed is a method of using such ink composition containing polyurethane vinyl hybrid latexes.
摘要:
Aqueous ink compositions containing anti-curl agents substantially reduce or eliminate paper curl in plain-paper printed elements without adversely effecting storage stability, decap properties or print quality, and thus eliminate the need for expensive and bulky mechanical curl-arresting devices or special curl-resistant substrates. Printing the inks on plain-paper substrates is the sole step in a process for reducing paper curl in plain-paper printed elements.
摘要:
An inkjet ink composition includes: from 0.25 to 6 weight percent colorant; from 7 to 40 weight percent solvent; from 0.05 to 5 weight percent surfactant; and polyurethane binder in an amount of at least 0.5 weight percent of the inkjet ink composition but not more than twice the weight percent of the colorant. The polyurethane binder has a molecular weight from 32 K to 50 K and an acid number from 40 to 45. The polyurethane binder includes polyether polyol, aliphatic isocyanate and an acid group and does not include chain extenders.
摘要:
An ink set includes a light magenta ink and a dark magenta ink. The light magenta ink includes an effective amount of a pigment having a red/green lambda cutoff ranging from about 585 nm to about 600 nm, and reflecting at least about 14% of blue light at a wavelength of about 470 nm when measured at a density at which the light magenta ink provides a maximum magenta chroma. The dark magenta ink includes an effective amount of a pigment having a red/green lambda cutoff greater than or equal to about 605 nm.