Ink compositions

Details Ink compositions Ink compositions

1999-03-30

2001-02-13

Klemanski, Helene (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031610, C106S031430, C106S031750, C106S031580, C106S031860

Reexamination Certificate

active

06187082

ABSTRACT:

REFERENCE TO COPENDING PATENT APPLICATIONS AND PATENTS
Inks which may be selected for acoustic ink printing processes are illustrated in Patents and copending patent applications: U.S. Pat. No. 5,931,995, U.S. Pat. No. 5,902,390, U.S. Pat. No. 5,876,492, U.S. Pat. No. 5,922,117, U.S. Pat. No. 5,958,119; and U.S. Pat. No. 6,045,607 and U.S. application Ser. No. 09/281,540, the disclosures of each being totally incorporated herein by reference.
In U.S. application Ser. No. 935,929 there are illustrated inks, which can be prepared by mixing 46 percent by weight of a liquid vehicle nonanoic acid, 42 percent by weight of the solid paper additive pentadecanoic acid, 3 percent by weight of a UV absorber 2-(4-benzoyl-3-hydroxy phenoxy) ethylacrylate 3 percent by weight of an antioxidant dioctadecyl-3,3′-thiodipropionate, and 6 percent by weight of a colorant selected from Orasol Black RLP, Sudan Blue 670, Sudan Red 462, or Sudan Yellow 146, and which inks provided images with optical density values of 1.6 (Black), 1.6 (Cyan), 1.35 (Magenta), 0.9 (Yellow); there are disclosed in U.S. Pat. No. 5,958,119 inks, which can be prepared, for example, by mixing 30 percent by weight of a liquid cyclic vehicle 1-acetyl-2-methyl-1-cyclopentene, 35 percent by weight of the solid paper additive 2,4,8,10-tetra oxa spiro [5.5] undecane, 20 percent by weight of the nitrile liquid crystalline compound 4′-(pentyloxy)4biphenyl carbonitrile, 5 percent by weight of the UV absorber 2-dodecyl-N-(2,2,6,6-tetramethyl-4-piperidinyl) succinimide, 5 percent by weight of the antioxidant tetra-sodium-N-(1,2-dicarboxyethyl)-N-octadecyl sulfosuccinamate, and 5 percent by weight of a colorant selected from Orasol Black RLP, Sudan Blue 670, Sudan Red 462, Sudan Yellow 146 provided images with optical density values of 1.52 (Black), 1.54 (Cyan), 1.32 (Magenta), 0.95 (Yellow); there are illustrated in U.S. Pat. No. 5,902,380 inks, which can be prepared by mixing 46 percent by weight of a liquid vehicle 4-ethyl cyclohexanone, 42 percent by weight of the solid paper additivel,6-dioxaspiro [4,4] nonane-2,7-dione, 3 percent by weight of the UV absorber 2-hydroxy-4-(octyloxy) benzophenone, 3 percent by weight of the antioxidant 2,2′-ethylidene-bis(4,6-di-tert-butylphenyl) fluoro phosphonite, and 6 percent by weight of a colorant selected from Orasol Black RLP, Sudan Blue 670, Sudan Red 462, Sudan Yellow 146, provided images with optical density values of 1.68 (Black), 1.61 (Cyan), 1.37 (Magenta), 0.92 (Yellow); and in U.S. Pat. No. 5,876,492 there are illustrated inks prepared by mixing 35 percent by weight of a liquid ester &ggr;-butyrolactone, (Aldrich #B10,360-8), 35 percent by weight of the solid additive methyl tetracosanoate, (Aldrich #29,905-7), 20 percent by weight of the liquid crystalline ester material 4-[(R)-(−)2-chloro-3-methyl butyryl oxy] phenyl-4-(decyloxy) benzoate, 2 percent by weight of the UV absorber hexadecyl 3,5-di-tert-butyl-4-hydroxy-benzoate, 2 percent by weight of the antioxidant 3-hydroxy-2,2-dimethyl propyl-3-hydroxy-2,2-dimethyl propionate and 6 percent by weight of the colorant selected from Orasol Black RLP, Sudan Blue 670, Sudan Red 462, Sudan Yellow 146, and which inks can generate images with optical density values of 1.65 (Black), 1.65 (Cyan), 1.45 (Magenta), 0.9 (Yellow). The disclosures of each of these copending applications are totally incorporated herein by reference.
The appropriate components and processes of the above copending applications may be selected for the present invention in embodiments thereof.
BACKGROUND OF THE INVENTION
The present invention is directed to ink compositions, and more specifically, the present invention relates to inks with an ink melting point of, for example, between about 60° C. and about 150° C., and preferably between about 70° C. to about 90° C., and which inks are especially useful for acoustic ink printing, processes and apparatuses, reference, for example, U.S. Pat. No. 5,121,141, U.S. Pat. No. 5,111,220, U.S. Pat. No. 5,128,726, U.S. Pat. No. 5,371,531, the disclosures of which are totally incorporated herein by reference, including especially acoustic ink processes as illustrated in the above recited copending applications, such as an acoustic ink printer for printing images on a record medium.
The inks of the present invention in embodiments can be considered phase change inks, that is, for example, an ink that changes from a liquid state to solid state in a suitable period of time, for example, from about 1 to about 100 milliseconds and preferably in less than about 10, such as from about 2 to about 7 milliseconds, and which inks are comprised of: (1) a phase-change color spreading compound, or an additive that preferably fills the pores of a substrate, such as paper, and which compound has a melting point of, for example, lower than about 120° C. and preferably between about 60° C. to about 100° C., and with a low acoustic loss value of below about 100 dB/mm, (2) a non-aqueous diluent additive with, for example, a boiling point higher than about 150° C., and more specifically, with a boiling point of from about 150° C. to about 225° C. and preferably from about 170° C. to about 200° C., and a melting point of less than about 60° C., and with a low acoustic loss, which enables a reduction, or minimization of energy consumption, and which acoustic loss is preferably in the range of from about 5 to about 60 dB/mm, and preferably between about 5 to about 40 dB/mm, (3) a lightfast UV absorber, (4) a lightfast antioxidant, (5) and a colorant such as a dye, a pigment or mixtures thereof. More specifically, the present invention is directed to phase-change acoustic ink compositions comprised of: (1) a nonaqueous thiourea, or an oxime compound vehicle with, for example, a melting point of lower than about 120° C. and preferably between about 60° C. and about 100° C., and preferably with a low acoustic loss and which acoustic loss is, for example, below about 100 dB/mm, and preferably in the range of between about 25 to about 80 dB/mm at the jetting temperature, (2) a nonaqueous diluent derived from a carbamate, thiourea, or an oxime compound, each with a boiling point of higher than about 150° C. and lower than about 350° C., and preferably between about 170° C. to about 300° C., and a melting point of less than about 60° C. and with low acoustic loss and which acoustic loss is below about 60 dB/mm, and preferably in the range of from about 35 to about 55 dB/mm, (3) a UV absorber, (4) an antioxidant, and (5) a colorant, and wherein there can be generated with such inks excellent developed images on plain and coated papers with acceptable image permanence, excellent projection efficiency on transparencies without a post fusing step, and excellent crease resistance, and wherein the inks possess acceptable, and in embodiments superior lightfastness of, for example, between about 90 to about 100 percent, and superior waterfast values of, for example, between about 95 to about 100 percent. Moreover, in embodiments of the present invention there is enabled the elimination, or minimization of undesirable paper curl since water need not be present, or minimum amounts less than about 1 percent of water may be selected in embodiments in the invention inks, and it is preferred that there be an absence of water. When water is not present in the inks a dryer can be avoided thereby minimizing the cost of the acoustic ink jet apparatus and process.
PRIOR ART
In acoustic ink printing, the print head produces approximately 0.5 to 8 picoliter and preferably about 2 picoliter droplets by an acoustic energy process. The ink under these conditions should preferably display a melt viscosity of about 10 centipoise or less at the jetting temperature. Furthermore, once the ink is jetted onto the paper, the ink image should possess excellent crease properties, and should be nonsmearing, waterfast, of excellent transparency and excellent fix qualities. In selecting an ink for such applications, it is desirable that

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