Phase change inks

Details Phase change inks Phase change inks

2000-08-03

2001-12-11

Koslow, C. Melissa (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031290, C106S031750, C106S031610, C106S031580, C106S031860

Reexamination Certificate

active

06328793

ABSTRACT:

Copending Application U.S. Pat. No. 6,096,124, filed Apr. 27, 1999, entitled “Ink Compositions,” with the named inventors Raymond W. Wong, Shadl L. Malhotra, and Marcel P. Breton, the disclosure of which is totally incorporated herein by reference, discloses a conductive ink composition comprising (1) an acid salt; (2) a conductive quaternary compound; (3) a viscosity modifying compound; (4) a lightfastness component; (5) a lightfastness antioxidant; and (6) a colorant.
Copending Application U.S. Pat. No. 6,086,661, filed Apr. 27, 1999, entitled “Ink Compositions,” with the named inventor Malhotra, James D. Mayo, and Marcel P. Breton, the disclosure of which is totally incorporated herein by reference, discloses an aqueous ink composition comprising (1) a quaternary compound selected from the group consisting of (a) imidazolinium quaternary salts, (b) phosphonium quaternary salts, and (c) an ammonium quaternary salt; (2) a liquid ink vehicle; (3) a paper-curl reducing compound; (4) a lightfastness component; (5) a lightfastness antioxidant; (6) a substantially water soluble organic salt or a substantially water soluble inorganic salt; (7) a biocide; and (8) a colorant.
Copending Application U.S. Pat. No. 6,106,601, filed Apr. 27, 1999, entitled “Ink Compositions,” with the named inventors Shadi L. Malhotra, Raymond W. Wong, and Marcel P. Breton, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (1) an oxazoline compound; (2) a thiourea compound with an optional melting point of from about 25 to about 100° C., and with an optional acoustic loss value of from about 5 to about 40 dB/mm; (3) an alcohol; (4) a lightfastness compound; (5) an antioxidant; and (6) a colorant.
Copending Application U.S. Pat. No. 6,110,265, filed Apr. 27, 1999, entitled “Ink Compositions,” with the named inventors Marcel P. Breton, Shadi L. Malhotra, Raymond W. Wong, Danielle C. Boils, Carl P. Tripp, and Pudupadi R. Sundararajan, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (1) a solid oxazoline compound with a melting point of from about 60° C. to about 120° C. and an acoustic loss value of from about 25 to about 80 dB/mm; (2) a carbamate compound with a melting point of from about 25° C. to about 100° C.; (3) an alcohol compound; (4) a lightfastness component; (5) a lightfastness antioxidant, and (6) a colorant.
Copending Application U.S. Pat. No. 6,096,125, filed Apr. 27, 1999, entitled “Ink Compositions” with the named inventors Marcel P. Breton; Shadi L. Malhotra, Danielle C. Boils, Raymond W. Wong, Guerino G. Sacripante, and John M. Lennon, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (1) a mixture comprising a salt and an oxyalkylene compound wherein the conductive mixture possesses a melting point of from about 60° C. to about 120° C.; (2) an ink vehicle compound with a melting point of from about 80° C. to about 100° C.; (3) a viscosity modifying amide compound; (4) a lightfastness component: (5) a lightfastness antioxidant; and (6) a colorant.
Copending Application U.S. Pat. No. 6,105,599, filed Jun. 29, 1999, entitled “Inks,” with the named inventors Marcel P. Breton, Shadi L. Malhotra, and Raymond W. Wong, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (1) an azole compound, (2) a viscosity compound, (3) a lightfastness component, (4) an antioxidant, and (5) a colorant.
Copending Application U.S. Ser. No. 09/632,135, filed concurrently herewith, entitled “Phase Change Inks,” with the named inventors Shadi L. Malhotra, Raymond W. Wong, and Marcel P. Breton, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (a) an ink vehicle comprising a benzoic acid compound substituted with an alkyl group, an alkoxy group, an arylalkyl group, an alkylaryl group, an arylalkyloxy group, or an alkyloxyaryl group: (b) a viscosity modifier; (c) a colorant; (d) an optional conductivity enhancing agent; (e) an optional antioxidant; and (f) an optional UV absorber.
Copending Application U.S. Ser. No. 09/632,193, filed concurrently herewith, entitled “Phase Change Inks,” with the named inventor Shadi L. Malhotra, the disclosure of which is totally incorporated herein by reference, discloses an ink composition comprising (a) a benzoyl benzoic acid compound; (b) a colorant; (c) an optional viscosity modifier; (d) an optional conductivity enhancing agent, and (e) an optional second acid.
BACKGROUND OF THE INVENTION
The present invention is directed to phase change (hot melt) ink compositions. More specifically, the present invention is directed to phase change ink compositions suitable for use in ink jet printing processes, including piezoelectric ink jet printing processes, acoustic ink jet printing processes, and the like. One embodiment of the present invention is directed to an ink composition comprising (a) a benzoyl benzamide compound; (b) a viscosity-modifying benzoyl-group-containing compound; (c) a colorant; and (d) an optional conductivity enhancing agent.
Acoustic ink jet printing processes are known. In acoustic ink jet printing processes, an acoustic beam exerts a radiation pressure against objects upon which it impinges. Thus, when an acoustic beam impinges on a free surface (i.e., liquid/air interface) of a pool of liquid from beneath, the radiation pressure which it exerts against the surface of the pool may reach a sufficiently high level to release individual droplets of liquid from the pool, despite the restraining force of surface tension. Focusing the beam on or near the surface of the pool intensifies the radiation pressure it exerts for a given amount of input power. These principles have been applied to prior ink jet and acoustic printing proposals. For example, K. A. Krause, “Focusing Ink Jet Head,”
IBM Technical Disclosure Bulletin
, Vol. 16, No. 4, September 1973, pp. 1168-1170, the disclosure of which is totally incorporated herein by reference, describes an ink jet in which an acoustic beam emanating from a concave surface and confined by a conical aperture was used to propel ink droplets out through a small ejection orifice. Acoustic ink printers typically comprise one or more acoustic radiators for illuminating the free surface of a pool of liquid ink with respective acoustic beams. Each of these beams usually is brought to focus at or near the surface of the reservoir (i.e., the liquid/air interface). Furthermore, printing conventionally is performed by independently modulating the excitation of the acoustic radiators in accordance with the input data samples for the image that is to be printed. This modulation enables the radiation pressure which each of the beams exerts against the free ink surface to make brief, controlled excursions to a sufficiently high pressure level for overcoming the restraining force of surface tension. That, in turn, causes individual droplets of ink to be ejected from the free ink surface on demand at an adequate velocity to cause them to deposit in an image configuration on a nearby recording medium. The acoustic beam may be intensity modulated or focused/defocused to control the ejection timing, or an external source may be used to extract droplets from the acoustically excited liquid on the surface of the pool on demand. Regardless of the timing mechanism employed, the size of the elected droplets is determined by the waist diameter of the focused acoustic beam. Acoustic ink printing is attractive because it does not require the nozzles or the small ejection orifices which have caused many of the reliability and pixel placement accuracy problems that conventional drop on demand and continuous stream ink jet printers have suffered. The size of the ejection orifice is a critical design parameter of an ink jet because it determines the size of the droplets of ink that the jet ejects. As a result, the size of the ejection orifice cannot be increased, witho

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