Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/003—Forme preparation the relief or intaglio pattern being obtained by imagewise deposition of a liquid, e.g. by an ink jet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
  • B41C1/1066—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
  • B41M5/504—Backcoats
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
  • B41C1/147—Forme preparation for stencil-printing or silk-screen printing by imagewise deposition of a liquid, e.g. from an ink jet; Chemical perforation by the hardening or solubilizing of the ink impervious coating or sheet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
  • B41C1/148—Forme preparation for stencil-printing or silk-screen printing by a traditional thermographic exposure using the heat- or light- absorbing properties of the pattern on the original, e.g. by using a flash
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
  • B41M5/506—Intermediate layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
  • B41M5/508—Supports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • B41M5/5281—Polyurethanes or polyureas

Definitions

• the present invention relates to a particular type of ink jet recording material and its use in printing applications.
• ink jet printing has become a popular technique because of its simplicity, convenience and low cost. Especially in those instances where a limited edition of the printed matter is needed ink jet printing has become a technology of choice.
• a recent survey on progress and trends in ink jet printing technology is given by Hue P. Le in Journal of Imaging Science and Technology Vol. 42 (1), Jan/Febr 1998.
• ink jet printing tiny drops of ink fluid are projected directly onto an ink receptor surface without physical contact between the printing device and the receptor.
• the printing device stores the printing data electronically and controls a mechanism for ejecting the drops image-wise. Printing is accomplished by moving the print head across the paper or vice versa.
• Early patents on ink jet printers include US 3,739,393, US 3,805,273 and US 3,891,121.
• the jetting of the ink droplets can be performed in several different ways.
• a continuous droplet stream is created by applying a pressure wave pattern. This process is known as continuous ink jet printing.
• the droplet stream is divided into droplets that are electrostatically charged, deflected and recollected, and into droplets that remain uncharged, continue their way undeflected, and form the image.
• the charged deflected stream forms the image and the uncharged undeflected jet is recollected.
• several jets are deflected to a different degree and thus record the image (multideflection system).
• the ink droplets can be created “on demand” (“DOD” or “drop on demand” method) whereby the printing device ejects the droplets only when they are used in imaging on a receiver thereby avoiding the complexity of drop charging, deflection hardware, and ink recollection.
• DOD on demand
• the ink droplet can be formed by means of a pressure wave created by a mechanical motion of a piezoelectric transducer (so-called “piezo method”), or by means of discrete thermal pushes (so-called “bubble jet” method, or “thermal jet” method).
• Ink compositions for ink jet typically include following ingredients : dyes or pigments, water and/or organic solvents, humectants such as glycols, detergents, thickeners, polymeric binders, preservatives, etc.. It will be readily understood that the optimal composition of such an ink is dependent on the ink jetting method used and on the nature of the substrate to be printed.
• the ink compositions can be roughly divided in :
• Pigments and particles have also been described in patent applications including DE 2,925,769, GB 2,050,866, US-P 4,474,850, US-P 4,547,405, US-P 4,578,285, WO 88 06532, US-P 4,849,286, EP 339604, EP 400681, EP 407881, EP 411638 and US-P 5,045,864 (non-exhaustive list).
• binders of which the most common types such as gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, and various types of cellulose derivatives. These conventional binders are mentioned in numerous patent documents.
• the objects of the present invention are realized by providing an ink jet recording material comprising a transparent polyester support, and on the front side of said support a layer pack (A) of at least two ink-receiving layers comprising a polyvinyl alcohol binder whereby the top layer of said pack further comprises a cationic mordant and a spacing agent, and on the back side of said support a double layer pack (B) comprising, in order, a latex subbing layer containing an electronically conductive polymer, and a second backing layer containing a crosslinked hydrophilic binder and a spacing agent.
• A of at least two ink-receiving layers comprising a polyvinyl alcohol binder whereby the top layer of said pack further comprises a cationic mordant and a spacing agent
• B double layer pack comprising, in order, a latex subbing layer containing an electronically conductive polymer, and a second backing layer containing a crosslinked hydrophilic binder and a spacing agent.
• the objects of the present invention are realized by providing an ink jet recording material comprising a transparent polyester support, and on the front side of said support a layer pack (A) of at least two ink-receiving layers comprising a polyvinyl alcohol binder whereby the top layer of said pack further comprises a cationic mordant and a spacing agent, and on the back side of said support a double layer pack (B') comprising, in order, a latex subbing layer and a second backing layer containing an electronically conductive polymer and a spacing agent.
• A of at least two ink-receiving layers comprising a polyvinyl alcohol binder whereby the top layer of said pack further comprises a cationic mordant and a spacing agent
• B' double layer pack comprising, in order, a latex subbing layer and a second backing layer containing an electronically conductive polymer and a spacing agent.
• a most suitable electronically conductive polymer is a poly(3,4-ethylenedioxythiophene)/polystyrene sulphonate complex.
• the ink-receiving layer assemblage is a multilayer pack containing at least two layers, and more preferably three layers.
• An essential ingredient of those layers is a polyvinyl alcohol (PVA) binder.
• PVA polyvinyl alcohol
• This PVA can be an unmodified, partially or almost completely hydrolized PVA
• Commercially available unmodified PVA binders include e.g. MOWIOL, trade mark of Hoechst AG, POLYVIOL WX 48/20, trade mark of Wacker Co., or AIRVOL 230, trade mark of Air Products Co..
• it can be a modified PVA, e.g.
• a cationic PVA such as GOHSEFIMER K-210, trade mark of Nippon Goshei Co.
• a silanol modified PVA such as POVAL R2105, POVAL R1130, and POVAL R3109 of Kuraray CO.
• the PVA can be used as the sole binder or can be admixed with small amounts of other well-known hydrophilic binders such as cellulosic derivatives, gelatin, polyvinyl pyrrolidone, etc..
• At least the top layer of the multilayer ink-receiving layer pack further contains a cationic mordant and a spacing agent.
• a useful cationic mordant is a cationic polyurethane, such as WITCOBOND 213, trade mark of Crompton Corp..
• Suitable cationic compounds are poly(diallyldialkylammonium chloride) compounds, e.g. a poly(diallyldimethylammonium chloride) or, in short, a poly(dadmac). These compounds are commercially available from several companies, e.g. Aldrich, Calgon, Clariant, BASF, EKA Chemicals, Nalco Italiana and Nippon Goshei.
• dadmac copolymers such as copolymers with acrylamide; dimethylamine-epichlorohydrine copolymers,
• CYPRO 514/515/516, SUPERFLOC 507/521/567 cationic cellulose derivatives such as CELQUAT L-200, H-100, SC-240C, SC-230M, trade names of Starch & Chemical Co., and QUATRISOFT LM200, UCARE polymers JR125, JR400, LR400, JR30M, LR30M and UCARE polymer LK; fixing agents from Chukyo Europe: PALSET JK-512, PALSET JK512L, PALSET JK-182, PALSET JK-220, WSC-173, WSC-173L, PALSET JK-320, PALSET JK-320L and PALSET JK-350; polyethyleneimine and copolymers, e.g.
• LUPASOL trade name of BASF AG
• triethanolamine-titanium-chelate e.g. TYZOR, trade name of Du Pont Co.
• copolymers of vinylpyrrolidone such as VIVIPRINT 111, trade name of ISP, a methacrylamido propyl dimethylamine copolymer; with dimethylaminoethylmethacrylate such as COPOLYMER 845 and COPOLYMER 937, trade names of ISP
• vinylimidazole e.g.
• LUVIQUAT CARE, LUVITEC 73W, LUVITEC VPI55 K18P, LUVITEC VP155 K72W, LUVIQUAT FC905, LUVIQUAT FC550, LUVIQUAT HM522, and SOKALAN HP56 all trade names of BASF AG; polyamidoamines, e.g. RETAMINOL and NADAVIN, trade marks of Bayer AG; and phosphonium compounds such as disclosed in EP 609930.
• Still other cationic compounds include cationic aluminum oxide, cationic boehmite, and poly(aluminumhydroxychloride) such as SYLOJET A200, trade name of Grace Co..
• Still further cationic polymers include polyvinylamines, e.g. PVAM-0595B from Esprit Co., and cationic modified acrylics, e.g. ACRIT RKW319SX, trade name of Tasei Chemical Industries, and RD134 from Goo Chemical.
• the nature and concentration of the spacing agent present in the top layer of the ink receiving pack must be chosen so that the best compromise between full area density and transparency of the non-printed areas is obtained. So advantageously the spacing agents are transparent beads. Classes of useful spacing agents include following :
• a preferred spacing agent is polymethylmethacrylate or derivatives.
• a most useful derivative is a copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt). This compound is preferable incorporated in a coated layer as a gelatinous dispersion.
• the ink-receiving layers may contain still other types of substances.
• surfactants which can be chosen from the numerous known classes of surfactants.
• cationic surfactants including e.g. N-alkyl dimethyl ammonium chloride, palmityl trimethyl ammonium chloride, dodecyldimethylamine, tetradecyldimethylamine, ethoxylated alkyl guanidine-amine complex, oleamine hydroxypropyl bistrimonium chloride, oleyl imidazoline, stearyl imidazoline, cocamine acetate, palmitamine, dihydroxyethylcocamine, cocotrimonium chloride, alkyl polyglycolether ammonium sulphate, ethoxylated oleamine, lauryl pyridinium chloride, N-oleyl-1,3-diaminopropane, stearamidopropyl dimethylamine lactate, coconut fatty amide, oleyl hydroxyethyl imid
• the ink-receiving layers may contain some minor amounts of pigments to such extent that they do not affect disadvantageously the transparency of the global ink jet recording element.
• the pigment may be chosen from organic material such as polystyrene, polymethylmethacrylate, silicones, urea-formaldehyde condensation polymers, polyesters and polyamides. In general however, it is an inorganic porous pigment, such as silica, talc, clay, koalin, diatomaceous earth, calcium carbonate, magnesium carbonate, aluminium hydroxide, aluminium oxide, titanium oxide, zinc oxide, barium sulfate, calcium sulfate, zinc sulfide, satin white, boehmite and pseudo-boehmite.
• organic material such as polystyrene, polymethylmethacrylate, silicones, urea-formaldehyde condensation polymers, polyesters and polyamides.
• it is an inorganic porous pigment, such as silica, talc, clay, koalin, diatomaceous earth, calcium carbonate, magnesium carbonate, aluminium hydroxide, aluminium oxide, titanium oxide, zinc oxide,
• the layers may also comprise a plasticizer such as ethylene glycol, diethylene glycol, propylene glycol, polyethylene glycol, glycerol monomethylether, glycerol monochlorohydrin, ethylene carbonate, propylene carbonate, tetrachlorophthalic anhydride, tetrabromophthalicanhydride, urea phosphate, triphenylphosphate, glycerolmonostearate, propylene glycol monostearate, tetramethylene sulfone, n-methyl-2-pyrrolidone, n-vinyl-2-pyrrolidone.
• a plasticizer such as ethylene glycol, diethylene glycol, propylene glycol, polyethylene glycol, glycerol monomethylether, glycerol monochlorohydrin, ethylene carbonate, propylene carbonate, tetrachlorophthalic anhydride, tetrabromophthalicanhydride, urea phosphat
• the support of the ink jet recording material used in accordance with the present invention is a transparent polyester support, e.g. a polyethylene terephthalate or polyethylene naphtalate.
• Polyethylene terephthalate (PET) is the preferred support.
• PET polyethylene terephthalate
• This support is subbed on both sides with a so-called latex subbing layer.
• An essential ingredient of this latex subbing layer is an adhesion promoting latex.
• a preferred class of latex polymers for this purpose are vinylidene chloride-containing copolymers having carboxyl functional groups.
• Illustrative of such polymers are (1) copolymers of vinylidene chloride and an unsaturated carboxylic acid such as acrylic or methacrylic acid, (2) copolymers of vinylidene chloride and a half ester of an unsaturated carboxylic acid such as the monomethylester of itaconic acid, (3) terpolymers of vinylidene chloride, itaconic acid and an alkyl acrylate or methacrylate such as ethyl acrylate or methyl methacrylate, and (4) terpolymers of vinylidene chloride, acrylonitrile or methacrylonitrile and an unsaturated carboxylic acid such as acrylic acid or methacrylic acid.
• the latex polymer is co(vinylidene chloride-methyl acrylate-itaconic acid ; 88 % / 10 % / 2 %).
• This copolymer is prepared by emulsion polymerization using 0.5 % MERSOLAT H (trade-mark of Bayer AG) as emulsifying agent. It is necessary to add extra surfactant, a so-called post-stabilizer, to the latex in order to assure a good stability on storage. An excellent storage stability is obtained when 4 % of ULTRAVON W, trade mark of Ciba-Geigy, or DOWFAX, trade mark of Dow, is used.
• a preferred compound is KIESELSOL 100F (trade-mark of Bayer AG), average particle size 25-30 nm.
• the ratio of the amount of latex to silica is preferably about 80/20.
• the latex subbing layer may further contain surfactants and biocides.
• the latex subbing layer of the back side of the support further contains an electronically conductive polymer.
• Substances having electronic conductivity instead of ionic conductivity have a conductivity independent from moisture. They are particularly suited for use in the production of antistatic layers with permanent and reproducible conductivity.
• said polythiophene has thiophene nuclei substituted with at least one alkoxy group, or -O(CH 2 CH 2 O) n CH 3 group, n being 1 to 4, or, most preferably, thiophene nuclei that are ring closed over two oxygen atoms with an alkylene group including such group in substituted form.
• Preferred polythiophenes for use according to the present invention are made up of structural units corresponding to the following general formula : in which : each of R 1 and R 2 independently represents hydrogen or a C 1-4 alkyl group or together represent an optionally substituted C 1-4 alkylene group or a cycloalkylene group, preferably an ethylene group, an optionally alkyl-substituted methylene group, an optionally C 1-12 alkyl- or phenyl-substituted 1,2-ethylene group, a 1,3-propylene group or a 1,2-cyclohexylene group.
• the most preferred compound is poly(3,4-ethylenedioxy-thiophene), (PEDT) with following formula :
• Suitable polymeric polyanion compounds required for keeping said polythiophenes in dispersion are provided by acidic polymers in free acid or neutralized form.
• the acidic polymers are preferably polymeric sulphonic acids. Examples of such polymeric acids are polymers containing vinyl sulfonic acid and styrene sulfonic acid or mixtures thereof.
• the anionic acidic polymers used in conjunction with the dispersed polythiophene polymer have preferably a content of anionic groups of more than 2% by weight with respect to said polymer compounds to ensure sufficient stability of the dispersion.
• Suitable acidic polymers or corresponding salts are described e.g. in DE-A -25 41 230, DE-A-25 41 274, DE-A-28 35 856, EP-A-14 921, EP-A-69 671, EP-A-130 115, US-P 4,147,550, US-P 4,388,403 and US-P 5,006,451.
• the weight ratio of polythiophene polymer to polymeric polyanion compound(s) can vary widely, for example from about 50/50 to 15/85.
• polystyrene sulphonate PSS
• polythiophene/polyanion complex is the preferred electronically conductive substance
• others can be used, e.g. polypyroles, polyanilines, sulphonated poly-p.-phenylenes, sulphonated polyfluorenes, polyphenylenevinylenes which can be carboxylated or sulphonated, polythienylenevinylenes which can be sulphonated or carboxylated.
• these polymers can also be used as complex with a polymeric polyanion, e.g. polystyrene sulphonate.
• the layer pack (B) on the back side comprises, apart from the latex subbing layer with the conductive compound, a second backing layer comprising a crosslinked hydrophilic binder and a spacing agent.
• the hydrophilic binder of the second backing layer is gelatin.
• Appropriate crosslinkers include those of the epoxide type, those of the ethylenimine type, those of the vinylsulfone type, e.g.1,3-vinylsulphonyl-2-propanol, chromium salts e.g. chromium acetate and chromium alum, aldehydes e.g. formaldehyde, glyoxal, and glutaraldehyde, N-methylol compounds e.g. dimethylolurea and methyloldimethylhydantoin, dioxan derivatives e.g.
• the second backing layer further contains a spacing agent.
• This spacing agent may be chosen from the same types as described for the top layer of the ink receiving layers.
• a most suitable cmpound is again copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt). This compound is preferable incorporated in the second backing layer as a gelatinous dispersion.
• the layer pack (B') on the back side of the polyester support comprises a latex subbing layer closest to the support, and an electroconductive layer as second backing layer.
• the latex subbing layer preferably contains no or substantially no electronically conductive compound.
• the composition is similar to the one described for the latex subbing layer of the first embodiment.
• the electronically conductive compound is present in the second backing layer.
• This electronically conductive compound is preferably chosen from the same compounds as decribed above for the first embodiment.
• a most suitable compound is again the poly(3,4-ethylenedioxythiophene/polystyrene sulphonate complex.
• the layer further contains a spacing agent which again is preferably chosen from the classes described above.
• a most suitable compound is again copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt).
• the binder of this backing layer may be hydrophilic or hydrophobic and may be crosslinked or not.
• a preferred binder is a film-forming polymethylmethacrylate. Furtheron this layer may contain other additives such as biocides and surfactants.
• the latex subbing layer on the front side of the polyester support has preferably essentially the same composition as the latex subbing layer of the back side, preferably however without the presence of an electronically conductive polymer.
• gelatin subbing layer between the latex subbing layer and the ink-receiving layers.
• this gelatin subbing layer contains a mixture of gelatin and colloidal silica.
• a preferred compound is again KIESELSOL 300F (trade-mark of Bayer AG).
• a plasticizing compound can be used in order to avoid the formation of cracks in the dried layer due to the occurence of excessive shrinking of the layer during drying. Plasticizing agents are well-known in the art. Low-molecular weight compounds (e.g. acetamide, glycerin) as well as polymeric latices (e.g. polyethylacrylate, poly-n.-butylacrylate) can be used for this purpose.
• gelatin subbing layer may contain one or more surfactants.
• useful surfactants include : ULTRAVONTM W, an aryl sulfonate from CIBA-GEIGY, DOWFAX from Dow CO., and ARKOPALTM N060 (previously HOSTAPALTM W), a nonylphenylpolyethylene-glycol from HOECHST.
• the thickness of the gelatin subbing layer is preferably comprised between 0.1 and 1 ⁇ m.
• the two latex subbing layers, the gelatin subbing layer, and the second backing layer are coated "on line" in a continuous process in the manufacturing alley of the polyester itself.
• Molten polyester is extruded and longitudinally stretched.
• the first latex subbing layer is applied on the upper side
• the second latex subbing layer optionally conductive, is applied on the back side.
• the subbed polyester is stretched in the transversal direction.
• the gelatin subbing layer is applied on the upper side, and finally the second backing layer is applied on the back side.
• the ink-receiving layers are coated "off-line". Any well-known coating technique can be used such as dip coating, air-knife coating, slide hopper coating, and curtain coating.
• An ink jet image produced image-wise from digitally stored information can be used as master for the exposure of a lithographic printing plate.
• the method involves the following steps, in order, :
• the ink used for the formation of the image may be any type of ink. Preferred however are aqueous inks.
• the UV absorbing colorant of the ink is preferably carbon black, but in principle also a mixture of dyes adding up to black can be used provided that the UV density is sufficient.
• Multicolour printing can be performed by exposing several printing plates through different ink jet mask produced from digital information corresponding to different colour separations. This application illustrates the importance of the dimensional stability of the ink jet material of the present invention.
• the ink jet image can be used as mask for the exposure of a silk screen.
• the method involves the following steps, in order, :
• the top layer further comprises a polyurethane having cationic groups (WITCOBOND) and as spacing agent copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt).
• WITCOBOND polyurethane having cationic groups
• spacing agent copoly(methylmethacrylate-stearylmethacrylate 98%/2%) stabilized by poly(styrene-maleic acid, sodium salt).
• a latex subbing layer containing essentially as adhesive latex co(vinylidene chloride-methyl acrylate-itaconic acid ; 88 % / 10 % / 2 %), colloidal silica and surfactants, and a gelatin subbing layer containing essentially gelatin and colloidal silica.
• the first backing layer is an electroconductive latex subbing layer comprising as adhesive latex co(vinylidene chloride-methyl acrylate-itaconic acid ; 88 % / 10 % / 2 %), and poly(3,4-ethylenedioxythiophene)/polystyrene sulphonate complex as conductive polymer. Further it contains colloidal silica (KIESELSOL 100F), a surfactant and a biocide.
• the second backing layer comprises gelatin crosslinked by a divinylsulfon hardener, and as matting agent a gelatinous dispersion of copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt).
• the front side composition is the same as for the invention 1 material.
• the first backing layer is a latex subbing layer similar to the one of example 1.1 but without electronically conductive compound.
• the second backing layer comprises poly(3,4-ethylenedioxythiophene)/polystyrene sulphonate complex as conductive polymer, copoly(methylmethacrylate-stearylmethacrylate 98%/2%), stabilized by poly(styrene-maleic acid, sodium salt) as spacing agent, colloidal silica, a polyethylene emulsion, and film-forming polymethylmethacrylate as binder.
• invention 1 material 62 ⁇ m
• comparison 2 material 74.5 ⁇ m.
• the printed front sides of the invention and comparison materials were after 10 minutes of drying pressed against different back layer packs and kept so for 24 hours.
• the tested back layer packs were the back layer packs of the invention 1 material, of the invention 2 material and of the comparison 1 material.
• comparison material 1 sticked to all tested backsides and there was ink tranfer from front to back.
• the printed front side of invention material 1 only sticked to the back side of comparison material 1 but not to the backsides of invention materials 1 and 2, and there was no ink transfer.
• Samples were coated with similar composition as invention sample 1 from the previous example with the exception that the nature of the cationic mordant was varied.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)
• Ink Jet (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)

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Citations (3)

• 2001
  • 2001-03-26 DE DE2001602443 patent/DE60102443T2/de not_active Expired - Fee Related
  • 2001-03-26 EP EP20010000070 patent/EP1245400B1/fr not_active Expired - Lifetime
• 2002
  • 2002-03-22 JP JP2002080374A patent/JP2003001932A/ja active Pending

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