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INK JET INTERCOLOR BLEEDING REDUCTION

IP.com Disclosure Number: IPCOM000027035D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 206K

Publishing Venue

Xerox Disclosure Journal

Abstract

Intercolor bleeding when two or more different colored aqueous inks are printed on plain paper is one dificulty encountered in ink jet printing. The bleeding is caused by mixing of the two inks upon imaging. Control of color bleeding for dye-based inks is generally more difficult than control of bleeding for pigment-based inks because of the ease of dissolving water soluble dyes near the bordering area of a two-color image by a second aqueous ink. The successful immobilization of the dye near the abut area immediately after printing the first color and prior to the application of a second color adjacent thereto can render the first dye insoluble in water; thus, the dye in the imaged area neighboring to the other color will not be redissolved by subsequent contact with the second color aqueous ink. This immobilization can also reduce showthrough and feathering of dye-based aqueous inks and can improve waterfastness, lightfastness, and optical density, and can reduce the chance of intercolor bleeding as a result of induced pigment precipitation.

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XEROX DISCLOSURE JOURNAL

INK JET INTERCOLOR BLEEDING REDUCTION U.S. C1.428/409 John Wei-Ping Lin

Proposed Classification

Int. C1. B32b 17/00

Intercolor bleeding when two or more different colored aqueous inks are printed on plain paper is one dificulty encountered in ink jet printing. The bleeding is caused by mixing of the two inks upon imaging. Control of color bleeding for dye-based inks is generally more difficult than control of bleeding for pigment-based inks because of the ease of dissolving water soluble dyes near the bordering area of a two-color image by a second aqueous ink. The successful immobilization of the dye near the abut area immediately after printing the first color and prior to the application of a second color adjacent thereto can render the first dye insoluble in water; thus, the dye in the imaged area neighboring to the other color will not be redissolved by subsequent contact with the second color aqueous ink. This immobilization can also reduce showthrough and feathering of dye-based aqueous inks and can improve waterfastness, lightfastness, and optical density, and can reduce the chance of intercolor bleeding as a result of induced pigment precipitation.

A coagulant or flocculant for the dye or pigment is applied to plain paper during the paper manufacturing process, either in the wet paper web, bulk application, or by a coating method or imaging process to apply the coagulant or flocculant to the paper. Imaging methods such as thermal ink jet printing, continuous ink jet printing, flexo printing, lithographic printing, or the like, can precisely deliver the coagulant or flocculant to the desired imaging area on the paper, including the neighboring areas of two different colors to be printed on the sheet. The coagulant or flocculant then reacts quickly with the dyes or pigments in the inks to form water insoluble complexes.

For example, when the aqueous ink contains an anionic type dye and/or anionic surfactants, suitable coagulants or flocculants include polymers and copolymers of vinylbenzyl ammonium chloride derivatives, acid salts of N,N- dialkyl aminoethyl acrylates (such as CH2 = CHC02CH2CH2NRiR2R3 + C1- and the like), N,N-dialkyl aminoethyl methacrylates (such as CH2 = C(CH3)C02CH2CH2N(CH3)2.HC1 and the like), N,N-dialkylammonium salts (such as chloride, bromide, iodide, and the like), polyvinyl pyridinium salts, and the like. Other useful coagulants or flocculants include cationic salts of polyamines, derivatives of polyamine and epichlorohydrin, ethylene oxide, or the like, salts of polyamines and alkyldihalides (such as hexadimethrinebromide and the like), salts of aminemodified polysaccharides,

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 Novernber/Decernber 1994 519

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INK JET INTERCOLOR BLEEDING REDUCTION(Cont'd)

and the like. Optionally, the coagulants or flocculants can be used in conjunction with different water soluble multiv...