Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-02-02
2003-03-04
Jagannathan, Vasu (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S505000, C524S506000, C528S025000, C528S027000, C528S029000, C528S043000
Reexamination Certificate
active
06528557
ABSTRACT:
Cross-reference is made to copending application U.S. Ser. No, 09/775,853, filed concurrently herewith, entitled “Inks Comprising Linear ABSCS′B′A′ or BASCS′A′B′ Alkylene Oxide/Siloxane Block Copolymers,”with the named inventor John Wei-Ping Lin, the disclosure of which is totally incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention is directed to ink jet ink compositions and ink jet printing processes. More specifically, the present invention is directed to aqueous ink compositions particularly suitable for the production of high quality images on print substrates. One embodiment of the present invention is directed to an ink composition comprising water, a colorant, and a linear ASBS′A′ block copolymer wherein A and A′ are each, independently of the other, blocks comprising one or more repeat monomer units of ethylene oxide, propylene oxide, or random or alternating mixtures of ethylene oxide and propylene oxide, B is a block comprising one or more repeat monomer units of an alkylsiloxane, a dialkylsiloxane, an alkyl aryl siloxane, a diarylsiloxane, or mixtures thereof, S is an optional spacer group between the A and B blocks, and S′ is an optional spacer group between the B and A′ blocks. Another embodiment of the present invention is directed to a set of inks for printing multicolor images in an ink jet printer, said ink set comprising (1) a first ink having a first color and comprising water and a first colorant; and (2) a second ink having a second color different from the first color and comprising water, a second colorant, and a linear ASBS′A′ block copolymer wherein A and A′ are each, independently of the other, blocks comprising one or more repeat monomer units of ethylene oxide, propylene oxide, or random or alternating mixtures of ethylene oxide and propylene oxide, B is a block comprising one or more repeat monomer units of an alkylsiloxane, a dialkylsiloxane, an alkyl aryl siloxane, a diarylsiloxane, or mixtures thereof, S is an optional spacer group between the A and B blocks, and S′ is an optional spacer group between the B and A′ blocks, wherein dry time of the ink containing the block copolymer is decreased and/or intercolor bleed between the first ink and the second ink is reduced when the second ink is printed adjacent to, on top of, or underneath the first ink on a print substrate. Yet another embodiment of the present invention is directed to a multicolor ink jet printing process which comprises: (1) incorporating into an ink jet printer a first ink having a first color and comprising water and a first colorant; (2) incorporating into the ink jet printer a second ink having a second color different from the first color and comprising water, a second colorant, and a linear ASBS′A′ block copolymer wherein A and A′ are each, independently of the other, blocks comprising one or more repeat monomer units of ethylene oxide, propylene oxide, or random or alternating mixtures of ethylene oxide and propylene oxide, B is a block comprising one or more repeat monomer units of an alkylsiloxane, a dialkylsiloxane, an alkyl aryl siloxane, a diarylsiloxane, or mixtures thereof, S is an optional spacer group between the A and B blocks, and S′ is an optional spacer group between the B and A′ blocks; (3) causing droplets of the first ink to be ejected in an imagewise pattern onto a substrate; and (4) causing droplets of the second ink to be ejected in an imagewise pattern onto the substrate, wherein dry time of the ink containing the block copolymer is decreased and/or intercolor bleed between the first ink and the second ink is reduced when the second ink is printed adjacent to, on top of, or underneath the first ink on the substrate.
Ink jet printing is a non-impact printing method which produces droplets of ink that are deposited on a print substrate in response to electronic digital data signals. Ink jet systems generally are of two types: continuous stream and drop-on-demand. In continuous stream ink jet systems, ink is ejected in a continuous stream under pressure through at least one orifice or nozzle. The stream of ink is periodically perturbed by pressure regulation in accordance with digital signals, causing it to break up into droplets at a fixed distance from the nozzle. At the break-up point, the charged ink droplets pass through an electrical field which adjusts the trajectory of each ink droplet to direct it to a gutter for ink circulation or to a specific location on a print substrate to produce an image. In a drop-on-demand system, an ink droplet is expelled from a nozzle directly onto a print substrate in accordance with digital data signals. Generally, a droplet is not formed or expelled unless it is to be placed on a print substrate.
Drop-on-demand systems are simpler than continuous stream systems since they do not require ink recovery, charging, or deflection. There are three types of drop-on-demand ink jet systems. One type of drop-on-demand system has an ink-filled channel or passageway having a nozzle on one end and a piezoelectric transducer near the other end to produce pressure pulses according to digital data signals. Multiple ink nozzles are used to deliver ink droplets onto a print substrate in an imagewise fashion. Several printheads and inks are used in a multicolor piezoelectric ink jet printing system. High resolution images can be obtained with this system. Examples of this system include the Epson 600, 800, and 1200 Ink Jet printers.
Another type of drop-on-demand ink jet printing system is called acoustic ink jet printing, which can be operated at high frequency and high resolution. Acoustic ink jet printing uses a focused acoustic beam formed with a spherical lens illuminated by a plane wave of sound created by a piezoelectric transducer. The focused beam reflected from a surface exerts a pressure onto the surface of the liquid ink, resulting in ejection of small droplets of ink onto a print substrate. An array of nozzles and corresponding transducers are used in an acoustic ink jet printing process to produce images on a print substrate in an imagewise fashion. Different types and configurations of acoustic printheads and substrate arrangements are possible. In a multicolor ink jet printing process, several acoustic ink jet printheads are used to deliver different inks onto a print substrate. Aqueous inks can be used in this drop-on-demand acoustic ink jet printing system. Examples of acoustic ink jet printing systems are disclosed in, for example K. A. Krause, “Focusing Ink Jet Head,”
IBM Technical Disclosure Bulletin
, Vol 16, No. 4, September 1973, pp. 1168-1170, and in, for example, U.S. Pat. Nos. 4,308,547, 4,697,195, 5,028,937, 5,041,849, 4,751,529, 4,751,530, 4,751,534, 4,801,953, and 4,797,693, the disclosures of each of which are totally incorporated herein by reference. The use of focused acoustic beams to eject droplets of controlled diameter and velocity from a free-liquid surface is also described in
J. Appl. Phys.
, vol. 65, no. 9 (May 1, 1989) and references therein, the disclosure of which is totally incorporated herein by reference.
Another type of drop-on-demand printing system is thermal ink jet printing. Thermal or bubble jet drop-on-demand ink jet printers have found broad applications as output for personal computers in the office and in the home. In thermal ink jet printing processes, the printhead typically comprises one or more ink jet ejectors, as disclosed in, for example, U.S. Pat. Nos. 4,601,777, 4,532,530, 4,412,224, 4,410,899, 4,251,824, 4,532,530, 4,601,777, 4,840,674, 5,145,518, 5,281,261, and 5,531,818, the disclosures of each of which are totally incorporated herein by reference. Each ejector includes a channel communicating with an ink supply chamber, or manifold, at one end and an opening at the opposite end, referred to as a nozzle. A thermal energy generator, usually a resistor, is located in each of the channels at a predetermined distan
Byorick Judith L.
Jagannathan Vasu
Shosho Callie E.
Xerox Corporation
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