WO1996010215A1 - Systeme de tirage d'epreuve pour verification des couleurs en mode surimpression a l'aide d'un procede negatif - Google Patents

Systeme de tirage d'epreuve pour verification des couleurs en mode surimpression a l'aide d'un procede negatif Download PDF

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Publication number
WO1996010215A1
WO1996010215A1 PCT/EP1995/003423 EP9503423W WO9610215A1 WO 1996010215 A1 WO1996010215 A1 WO 1996010215A1 EP 9503423 W EP9503423 W EP 9503423W WO 9610215 A1 WO9610215 A1 WO 9610215A1
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WO
WIPO (PCT)
Prior art keywords
layer
adhesive layer
receiver base
photosensitive
image
Prior art date
Application number
PCT/EP1995/003423
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English (en)
Inventor
Rudi De Busser
Eddie Daems
Luc Leenders
Original Assignee
Agfa-Gevaert Naamloze Vennootschap
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Filing date
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Application filed by Agfa-Gevaert Naamloze Vennootschap filed Critical Agfa-Gevaert Naamloze Vennootschap
Publication of WO1996010215A1 publication Critical patent/WO1996010215A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F3/00—Colour separation; Correction of tonal value
    • G03F3/10—Checking the colour or tonal value of separation negatives or positives
    • G03F3/106—Checking the colour or tonal value of separation negatives or positives using non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, other than silicon containing compounds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/34—Imagewise removal by selective transfer, e.g. peeling away

Definitions

  • the present invention relates to a dry processable negative working surprint colour proofing system based on
  • Photographically produced colour proofs are a simulation for multicolour halftone reproductions as will be produced by successive printing in register with the separate standard inks : magenta, yellow, cyan and black on a conventional printing press.
  • Press proofing for the production of colour proofs by preparing a printing plate and running the plate on the press to produce only a few copies as proof of the quality of the halftone separation transparencies used in the plate production is a very ctimbersome and expensive procedure and therefore photoimaging processes and materials have been developed to obtain a similar result by means of which the appearance of a print starting from particular colour separation negatives or positives can be judged by the printer and client.
  • an independent transparent plastic support is used as base for the production of a proof image of each color separation film by applying a
  • a colour proof is prepared by successively producing images of different colours from different colour separation films on a single receiver sheet. This can be accomplished by sequentially applying colorants or coloured, photosensitive layers to a single opaque support. This method more closely resembles the actual printing process and eliminates the colour distortion inherent in the overlay system. Examples of such single sheet approaches are contained in U.S. Patents 3,671,236; 4,260,673; 4,366,223; 4,650,738; 4,656,114; and 4,659,642.
  • Colour proofing systems can also be subdivided in dry processes and in methods involving one or more wet processing steps.
  • US 4,596,757 provides a method for transferring images or solid colours which are subsequently imaged.
  • the photosensitive material comprises a carrier support having sequentially disposed thereon a release layer, a coloured photopolymerizable layer and an adhesive layer.
  • the material can undergo exposure, lamination to a temporary support, wet development, and then lamination to a receptor sheet.
  • the photosensitive material can be laminated to a receptor sheet, undergo exposure and then wet processing. Both processes require development in an aqueous medium.
  • EP 0 339 860 a proofing system is described involving a development step by alkali.
  • photosensitive material comprises a stripable cover sheet, a
  • a dry proofing method comprising, in order, (A) providing a photosensitive element comprising (i) a support, (ii) a coloured photopolymerizable layer, (iii) an adhesive layer, (B) in either order, providing a receiver base to which said adhesive layer is laminated, and image-wise exposing this
  • the present invention extends the teachings on dry surprint (or single sheet) colour proofing systems based on photopolymerisation.
  • the objects of the present invention are realized by providing a method for the formation of a negative coloured image comprising, in order, the following steps :
  • a photosensitive layer comprising a polymeric binder, a colorant, a photoinitiating system, and a photopolymerisable ethylenically unsaturated monomer, the amount monomer / amount binder ratio being at least 4:1 by weight,
  • an adhesive layer comprising a thermoplastic polymer having a T g between 20 °C and 110 °C,
  • step (D) optionally repeating steps (A) through (C) at least once with another photosensitive element containing a different colorant thus forming a negative multicolour image on the receiver base.
  • Essential for obtaing the negative image polarity as it is the case in this invention is the high monomer / binder ratio being at least 4 : 1 by weight.
  • Suitable transparent supports include e.g. cellulose nitrate film, cellulose acetate film, poly (vinyl acetal) film, polystyrene film, poly (ethylene terephthalate) film, polycarbonate film, polyvinylchloride film or poly- ⁇ -olefin films such as polyethylene or polypropylene film.
  • the thickness of such organic resin film is preferably comprised between 0.025 and 0.20 mm.
  • the support is a polyethylene terephthalate support.
  • a suitable subbing layer is a layer containing a polymer containing covalently bound chlorine.
  • Suitable chlorine containing polymers are e.g. polyvinyl chloride, polyvinylidene chloride, a copolymer of vinylidene chloride, an acrylic ester and itaconic acid, a copolymer of vinyl chloride and vinylidene
  • chloride a copolymer of vinyl chloride and vinyl acetate, a copolymer of butylacrylate, vinyl acetate and vinyl chloride or vinylidene chloride, a copolymer of vinyl chloride, vinylidene chloride and itaconic acid, a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol, chlorinated polyethylene, polychloroprene and copolymers therof, chlorosulfonated polyethylene,
  • a preferred chlorine containing polymer is co(vinylidenechloride- methylacrylate-itaconic acid ; 88 % / 10 % : 2 %).
  • Suitable polymers not containing chlorine include co(styrene- butadiene-carbonic acid), polyvinyl acetate, and
  • the amount of the itaconic acid part is preferably comprised between 2 and 15 %.
  • the T g of the polymer can be adjusted by varying the relative amounts of the methylmethacrylate and the butadiene parts while keeping the itaconic acid part constant at about 5 % .
  • the copolymer is composed of 47.5 % of methylmethacrylate, 47.5 % of butadiene and 5 % of itaconic acid.
  • the essential ingredients of the photosensitive layer are a binder, a monomer, a colorant and a photoinitiator.
  • binders examples include organic solvent-soluble polymers, e.g. polymers derived from ⁇ , ⁇ -ethylenically unsaturated compounds such as e.g. polyvinyl acetate, a vinyl acetate-vinyl chloride copolymer, a styrene-butadiene copolymer, polyethylene, and polypropylene.
  • suitable binders for the photosensitive layer are styrene/maleic anhydride copolymers and their half esters, acrylic polymers and copolymers, polyarnides, polyvinyl pyrrolidones, cellulose and its derivatives and phenolic resins.
  • binders are polyvinyl acetals, such as polyvinyl butyral and polyvinyl propional. Still other preferred binders are polyvinyl formals which are commercially available from Monsanto as FORMVAR.
  • the formal content of the polyvinyl formals is approximately 65 % to 86 % expressed as percent polyvinyl formal.
  • the acetate content is approximately 9 % to 30 % expressed as percent polyvinyl acetate.
  • the hydroxyl content is approximately 5 % to 7 % as expressed as percent polyvinyl alcohol.
  • the average molecular weight is between 10,000 and 40,000.
  • Suitable monomers include e.g. the monomers disclosed in DE-OS Nos. 4005231, 3516256, 3516257, 3632657 and US 4,629,676, unsaturated esters of polyols, particularly such esters of the alpha-methylene carboxylic acids, e.g. ethylene diacrylate, glycerol tri(meth)acrylate, ethylene dimethacrylate, 1,3-propanediol di(meth)acrylate 1,2,4-butanetriol tri(meth)acrylate, 1,4-cyclohexanediol di(meth)acrylate,
  • unsaturated esters of polyols particularly such esters of the alpha-methylene carboxylic acids, e.g. ethylene diacrylate, glycerol tri(meth)acrylate, ethylene dimethacrylate, 1,3-propanediol di(meth)acrylate 1,2,4-butanetriol tri(meth)acrylate, 1,4
  • polyethylene glycols of molecular weight 200-500, and the like unsaturated amides, particularly those of the alphamethylene carboxylic acids, and especially those of Alpha-Omega-diamines and oxygen-interrupted omega-diamines, such as methylene bis-acrylamide, methylene bis-methacrylamide, 1, 6-hexamethylene bis-acrylamide, diethylene triamine tris-methacrylamide,
  • the photopolymerizable composition may also comprise polymers and/or oligomers comprising 2 or more polymerizable functions e.g. acrylated epoxies, polyester acrylates, urethane acrylates etc.. It will be clear that these monomers and/or polymers and/or oligomers can be used in admixture.
  • Suitable compounds include n- octylacrylate, n-octylmethacrylate, decylacrylate,
  • the most preferred polymerizable compounds comprise one or more (meth) acrylate functional groups.
  • Particular preferred classes of photopolymerizable compounds containing (a) (meth) acrylate group (s) are reactive multifunctional monomers disclosed in EP 0 502 562 and represented by general formula (I) or (II) :
  • A represents an organic group of the following nature being 3 to 6 valent when n equals 1 and being 2 to 6 valent when n equals 2 or 3 a) a hydrocarbon residue containing 5 to 25 carbon atoms which may be interrupted by one or more ether, ester or amide functions; b)
  • a 1 representing a linear or branched aliphatic residue that may contain 0 to 3 O-atoms and 2 to 20 C-atoms, an aromatic residue containing 6 to 24 carbon atoms, _ an aromatic aliphatic residue containing 7 to 28 C-atoms or an cycloaliphatic residue containing 6 to 26 C-atoms, R 3 and R each independently representing a hydrogen or a methyl group, A representing a hydrocarbon residue containing 5 to 25 carbon atoms, o
  • n represents an integer of 0 to 5 and p represents an integer of 2 to 6 when n equals 2 or 3 and represents an integer of 3 to 6 when n equals 1 ;
  • a 1 , A 2 , R 3 , R 4 , o and p have the same meaning as defined above;
  • G represents -O-CO-NH-Y(-COO-) q - ;
  • Y represents a divalent (cyclo) aliphatic residue containing 2 to 15 C-atoms and that may contain an ester, ether or urethane function
  • q represents 0 or 1
  • QJ represents a linear or branched aliphatic hydrocarbon residue containing 3 to 15 carbon atoms and which may comprise 1 to 3 oxygen bridges and r equals 0 or 1
  • X represents O or NR
  • L* represents an aliphatic hydrocarbon residue that is at least divalent and that may comprise 1 to 3 0-atoms
  • 1> represents a lower alkylene of 1 to 6 C-atoms which may be branched or linear,
  • R 1 represents hydrogen or a methyl group
  • R 2 represents hydrogen or a lower alkyl group of 1 to 6 C-atoms
  • Ur represents a divalent or trivalent condensed urea residue
  • Z represents O or NR 10 with R 10 representing alkyl containing 1 to
  • R represents a divalent hydrocarbon residue containing 2 to 25 C- atoms ;
  • R 8 represents a hydrocarbon residue with a valence between 2 and 6, and containing 2 to 18 C-atoms, which, can be linear or branched and which can be interrupted by upto 3 O atoms ;
  • R 9 represents hydrogen or methyl
  • ⁇ represents an integer from 1 to 5
  • ⁇ 2 or 3.
  • Preferably used monomers comprise one of the following residues as hydrocarbon residue A and/or A 2 of general formula (I) :
  • R 5 and R 6 each independently represent hydrogen or a lower alkyl of 1 to 6 C-atoms, s and t independently represent an integer from 1 to 6 and wherein the aliphatic hydrocarbon residues la, Ic and Id comprise 2 to 6 free valences.
  • i and j are respectively 3.5 and 0.5 indicating that compound 6 is a mixture of compounds obtained by reacting i equivalents of glycerine- dimethacrylate and j equivalents of hydroxyethyl methacrylate as disclosed in DE 3,703,130.
  • i and j are respectively 2.5 and 1.5 indicating that compound 7 is a mixture of compounds obtained by reacting i equivalents of glycerine- dimethacrylate and j equivalents of hydroxyethyl methacrylate as disclosed in DE 3,703,130.
  • the fractal indexes in the formulas 1, 2 and 10 indicate that these formulas represent a mixture of compounds having a different length of the ethylene-oxide piece in said formulas the indexes thus representing an avarage of said ethylene-oxide piece.
  • the formulas 14 to 23 represent a mixture of structural isomers and can be used in accordance with the present invention without separation of the isomers.
  • the photoinitiator system present in the photosensitive layer, comprises one or more compounds which directly furnish free-radicals when activated by actinic radiation. It can also comprise a
  • spectral sensitizers e.g. spectral sensitizers
  • Numerous conventional photoinitiators systems may be used provided they are compatible with the other ingredients of the element.
  • Useful photoinitiators are ketoxime-esters.
  • Preferred photoinitiator systems are 2, 4,5-triphenylimidazolyl dimers in combination with chain transfer agents, or hydrogen donors, such as are disclosed in US 3,479,185, US 3,784,557, US 4,311,783 and
  • hexaarylbisimidazoles are 2-o-chloro- substituted hexaphenylbisimidazoles in which the other positions on the phenyl radicals are unsubstituted or substituted with chloro, methyl or methoxy.
  • the most preferred initiator is o.-Cl-HABI, i.e., 2,2'-bis-(o-chloro-phenyl)-4,4,5,5',tetraphenyl-1, 1'-bisimidazole (or simply "bisimidazole”) corresponding to following chemical formula
  • Hydrogen donor compounds useful as chain tranfer agents in the photopolymer layer include : 2-mercaptobenzoxazole, 2- mercaptobenzothiazole, 4-methyl-4H-1,2,4,-triazole-3-thiol, and the like.
  • a preferred hydrogen donor is 2-mercaptobenzooazole with following formula :
  • Useful photoinitiators described in US 2,760,863 include vicinal ketaldonyl alcohols, such as benzoin, pivaloin, acyloin ethers, e.g. benzoin methyl and ethyl ethers, and CC-hydrocarbon- substituted aromatic acyloins, such as ⁇ -methylbenzoin.
  • Further useful photoinitiators include quinoxaline compounds as described in U.S. Patent 3,765,898, the vicinal polyketaldonyl compounds in U.S. Patent 2,367,660, the ⁇ -carbonyls in U.S. Patent 2,367,661 and 2,367,670, the acyloin ethers in U.S. Patent 2,448,828, the
  • the photoinitiator is preferably present in the photosensitive layer in an amount ranging from 2 to 30 % by weight.
  • sensitizers derived from aryl ketones and p-dialkylaminoaldehydes.
  • US-P 4,987,230 and US-P 4,987,230 also disclose sensitizers for HABI systems.
  • A. preferred sensitizer is 7-diethylamino-4-methylcoumarin.
  • Dyes and/or pigments are included in the photosensitive layer.
  • Preferred colorants for this invention are pigments rather than dyes. Light fast colorants are preferred.
  • the pigments are typically dispersed with an organic binder in an organic solvent or mixture of organic solvents.
  • the pigments may be organic or inorganic. They are ground to a small enough particle size to duplicate the particle size and color of equivalent inks. The median diameter is generally less than 1 ⁇ m.
  • Non-exclusive examples of colorants usable in the present invention are as follows : Permanent Yellow G (C.I. 21095);
  • Permanent Yellow GR (C.I. 21100), Permanent Yellow DHG (C.I. 21090), Permanent Rubine L6B (C.I. 15850:1), Permanent Pink F3B (C.I.
  • Hostaperm Blue A2R C.I. 74160
  • Carbon Printex 25 Most of these pigments are products of Hoechst AG. They can be used separately or blended for a desired colour.
  • the colorant is present in the photosensitive layer in an amount preferably ranging from 10 % to 50 % by weight.
  • ingredients which may be present in the photosensitive layer include thermal polymerization inhibitors, plasticizers, residual solvents, surfactants, inert fillers, antihalation
  • the photosensitive layer is preferably coated at a dry coverage ranging from 0.25 g/m 2 to 10 g/m 2 .
  • thermoadhesive layer can be coated directly on top of the photosensitive layer, but the preferred method for applying the adhesive layer to the photosensitive layer is by laminating it to this photosensitive layer under elevated pressure and/or temperature. In the latter case the adhesive layer is
  • the dried adhesive layer can be brought in close contact with the photosensitve layer.
  • the temporary support is removed, and then the adhesive layer with the photosensitive layer and the original temporary support is laminated to a receiver base.
  • the dried adhesive layer may be laminated to a receiver base.
  • the temporary support is removed, and the photosensitive layer with support is laminated to the adhesive layer on the receiver base.
  • the same polymeric resins can be chosen as for the transparent support of the photosensitive element, e.g. polyethylene
  • the coating of the adhesive layer may be accomplished in several different ways. In the case of direct coating on top of the adhesive layer
  • some adhesives may be coated out of organic solvents which do not have any solubilizing or deleterious effect on the photosensitive layer.
  • solvents can include cyclohexane, n- heptane, and n-hexane.
  • thermoadhesive polymers are preferably coated in this case as aqueous solutions for ecological reasons. They must show a T g between 20 and 110 °C.
  • Useful latices include styrene-butadiene latices. These latices can contain other comonomers which improve the stablitity of the latex, such as acrylic acid, methacrylic acid and acrylamide.
  • polymer latices include polyvinylacetate, copoly(ethylene- vinylacetate), copoly (acrylonitrile-butadiene-acrylic acid), copoly(styrene-butylacrylate), copoly(methylmethacrylate-butadiene), copoly(methylmethacrylate-butylmethacrylate),
  • copolyester terephtalic acid-sulphoisophtalic acid-ethyleneglycol
  • copolyester terephtalic acid-sulphoisophtalic acid-hexanediol-ethyleneglycol
  • BAYSTAL polymer types marketed by Bayer AG, which are on the basis of styrene-butadiene copolymers.
  • still other useful polymers are the EUDERM polymers, also from Bayer AG, which are copolymers comprising n.-butylacrylate, methylmethacrylate, acrylonitrile and small amounts of methacrylic acid.
  • Acrylic polymers and copolymers are preferred for the lamination method of applying the thermoadhesive layer to the photosensitive layer. Vinyl acetate polymers and copolymers are most preferred.
  • Polyvinyl acetates are available from Hoechst AG as Mowilith. These resins have a average molecular weight between 35,000 and 2,000,000. In the preferred embodiment, the polyvinyl acetate is present in the adhesive layer in an amount of greater than 60 percent by weight. In this case organic solvents can also be used for coating the adhesive layer to the temporary support. This temporary support can be chosen from the same list of polymeric resins suitable as support for the photosensitive element.
  • thermoadhesive layer can be present into the thermoadhesive layer to improve the layer formation or the layer properties, e.g. thickening agents, surfactants, levelling agents, thermal solvents and
  • this layer may contain components as UV absorbers, antistatic compositions, optical brighteners and plasticizers.
  • Suitable plasticizers include phthalates, non-exclusively including dibutyl phthalate, butyl benzyl phthalate, and dimethyl phthalate.
  • Polymeric plasticizers such as RESOFLEX R-296 available from
  • the plasticizer may be present in the adhesive layer in an amount of up to approximately 25 percent by weight.
  • the dry adhesive layer has a coating weight range between approximately 3 and 30 g/m 2 .
  • the more preferred coating weight is between approximately 5 and 15 g/m 2 .
  • the thickness of the adhesive may be adjusted to regulate the apparent dot size of the final proof.
  • Receiver bases may comprise virtually any material which can withstand the laminating and dry development processes.
  • Plastic sheets such as polyethylene terephthalate are useful for this purpose.
  • the plastic sheet serving as receiver base is thicker than the transparent support of the original photosensitive element ; its thickness is preferably comprised between 50 and 400 ⁇ m.
  • this polymeric receiver base is be pigmented e.g. by means of titanium dioxide or they can carry a precoat containing titanium dioxide.
  • Plastic coated paper sheets, such as polyethylene coated paper may also be used.
  • they can also be provided with a precoat containing titanium dioxide.
  • Still other bases may include wood, glass, metal, cardboard and the like.
  • the receiver sheet in ordinary printing paper.
  • thermoadhesive layer belonging to first colour transferred, can contain titanium dioxide.
  • An appropriate amount of titanium dioxide can be chosen in order to regulate the apparent dot size (so-called "dot gain") in the final proof, as will be illustrated by example 2 furtheron. Preferably this amount is limited to 50 % vis-a-vis the amount of
  • thermoadhesive polymer thermoadhesive polymer
  • Lamination may be conducted by putting the two materials in contact and then introducing the materials into the nip of a pair of heated laminating rollers under suitable pressure.
  • laminating temperatures usually range from approximately 50°C to 130oC, preferably from 75oC to 110oC.
  • the photosensitive layer is exposed by means well known in the art. Exposure can be performed after the adhesive is applied to the photosensitive layer, but preferably it is done after the adhesive and photosensitive layer have been laminated to the receiver base . Such exposure may be performed by actinic radiation from a light source through a conventional halftone negative or positive colour separation under vacuum frame conditions. Mecury vapor discharge lamps are preferred over metal halide lamps. Other radiation sources, such as carbon arc and pulsed xenon may also be used. Light absorbing filters may be used to reduce light scattering in the materials. When the photosensitive element has been sensitized to the visible spectral region as explained above electronically stored information can be recorded directly on the photosensitive element by a laser source, e.g. an Ar ion laser (so-called Direct Digital Colour proofing, DDCP).
  • a laser source e.g. an Ar ion laser (so-called Direct Digital Colour proofing, DDCP).
  • the photosensitive composition is dry developed by peeling apart the support from the receiver base at room temperature with a steady, continuous motion. No devices are necessary to hold down the receiver base during peeling because only moderate manual peeling forces are needed to separate the materials.
  • the preferred peel angle relative to the peel direction is greater than 90°.
  • Another photosensitive layer can be laminated via another adhesive layer (this time containing no titanium dioxide) to the first image on the receiver base.
  • This second photosensitive layer has usually a different colour than the first and is exposed through the appropriate color separation. After lamination to the receiver and exposure, the support of the second photosensitive layer is removed as was done with the first support. The second negative image with its adhesive remains with the first image.
  • a third and a fourth image may be added in a manner similar to that used to produce the second image. In the usual case, four coloured layers are used to produce a full colour proof. These four colours are cyan, magenta, yellow, and black.
  • a matte finish of the final image may be obtained by embossing the shiny, top surface of the image with a matte material, such as Melinex 377 from ICI. This is done by laminating together the final image and matte material. The matte material is then generally removed after lamination.
  • a matte material such as Melinex 377 from ICI.
  • a protective layer may be laminated on top of the last dry developed layer.
  • a subbing layer was applied containing copoly (methylmethacrylate- butadiene-itaconic acid ; 47.5 % / 47.5 % / 5 %) at a coverage of 50 mg/m .
  • a coating composition was prepared containing following ingredients :
  • Carbon printex 25 was incorporated as a 10 % dispersion
  • This coating solution was applied to the subbed support on a warm coating plate (45 °C) giving rise to a wet coating thickness of 50 ⁇ m. After drying on air the layer was further dried for 30 minutes.
  • thermoadhesive layer (TAX) was composed of : n.-butylacetate 82 g
  • MOWILITH 30 (vinyl acetate compolymer, Hoechst AG) 18 g
  • This solution was coated onto the untreated side of polyethylene terephthalate sheet having a thickness of 63 ⁇ m and serving as temporary support.
  • the layer was dried in the same way as the photosensitive layer.
  • the dry tickness of the layer was 12 ⁇ m.
  • the thermoadhesive layer was applied to the photosensitive layer at 80 °C. Then the temporary support was removed by delamination.
  • the photosensitive element was laminated to a receiver base serving as permanent support in a CODOR LAMIPACKER LPP 650 (Domed B.V., Amsterdam, NL).
  • the receiver base consisted of a 180 ⁇ m thick polyethylene terephthalate sheet, pigmented with titanium dioxide and covered with a copolyester (VITEL PE200, Goodyear Co.) subbing layer. This composite material was then image-wise exposed through its original support by means of a UV source in a
  • a coating solution was prepared according to the following composition :
  • Carbon printex 25 was incorporated as a 10 % dispersion containing also 5 % of FORMVAR from a 1:1 solvent mixture of l-methoxy-2-propanol and ⁇ -butyrolactone.
  • This coating solution was applied to the same subbed support as in example 1 by means of a BRAIVE coating knife giving rise to a wet coating thickness of 50 ⁇ m. After drying on air the layer was further dried in an oven at 60 °C.
  • thermoadhesive layer Four different coating solutions for the thermoadhesive layer were prepared containing 18 g of MOWILITH 30, titanium dioxide in amounts varying between 0 and 7.5 g and n.-butyl acetate as to give a total weight of 30 g.
  • the layers were coated to a dry coverage of 12 g MOWILITH per m 2 .
  • Each solution was coated onto the untreated side of polyethylene terephthalate sheet having a thickness of 63 ⁇ m and serving as temporary support.
  • the layer was dried in the same way as the photosensitive layer.
  • Each thermoadhesive layer was applied to the photosensitive layer at 80 °C.
  • the temporary support was removed by delamination.
  • the photosensitive element was laminated to a receiver base serving as permanent support in a CODOR LAMIPACKER LPP 650 (Domed B.V., Amsterdam, NL).
  • This receiver base consisted of polyethylene coated paper. This composite material was then image-wise exposed at the original support side through a 50 % dot screen original by means of a UV source in a contactexposure apparatus.

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  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

On décrit un procédé travaillant en négatif, destiné à la formation d'une épreuve de vérification des couleurs en mode surimpression, dans les arts graphiques, avant tirage. Une composition photosensible pigmentée pourvue d'une couche adhésive est exposée en mode image à des radiations actiniques, les zones exposées subissant ainsi une photopolymérisation. Les zones exposées sont transférées vers une base réceptrice et forment sur celle-ci une image négative. En répétant ce processus avec des colorants différents, on peut obtenir une épreuve d'impression tout en couleur.
PCT/EP1995/003423 1994-09-27 1995-08-30 Systeme de tirage d'epreuve pour verification des couleurs en mode surimpression a l'aide d'un procede negatif WO1996010215A1 (fr)

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EP94202769.9 1994-09-27
EP94202769 1994-09-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5856064A (en) * 1996-09-10 1999-01-05 Minnesota Mining And Manufacturing Company Dry peel-apart imaging or proofing system
US6013409A (en) * 1996-09-10 2000-01-11 3M Innovative Properties Company Dry peel-apart imaging process

Citations (9)

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EP0420675A2 (fr) * 1989-09-28 1991-04-03 Minnesota Mining And Manufacturing Company Système pour tirage d'épreuves à faible gain de point
EP0437343A2 (fr) * 1990-01-10 1991-07-17 Hoechst Celanese Corporation Système d'épreuve en couleurs photopolymérisable, travaillant en positif, développable par dépouillage
WO1992015920A2 (fr) * 1991-03-04 1992-09-17 E.I. Du Pont De Nemours And Company Element photosensible epluchable

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EP0040424A1 (fr) * 1980-05-21 1981-11-25 E.I. Du Pont De Nemours And Company Elément à base d'un photopolymère, à dépouillement à sec, travaillant négativement
EP0186194A2 (fr) * 1984-12-27 1986-07-02 E.I. Du Pont De Nemours And Company Procédé pour la fabrication d'une épreuve sur support
EP0420675A2 (fr) * 1989-09-28 1991-04-03 Minnesota Mining And Manufacturing Company Système pour tirage d'épreuves à faible gain de point
EP0437343A2 (fr) * 1990-01-10 1991-07-17 Hoechst Celanese Corporation Système d'épreuve en couleurs photopolymérisable, travaillant en positif, développable par dépouillage
WO1992015920A2 (fr) * 1991-03-04 1992-09-17 E.I. Du Pont De Nemours And Company Element photosensible epluchable

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Publication number Priority date Publication date Assignee Title
US5856064A (en) * 1996-09-10 1999-01-05 Minnesota Mining And Manufacturing Company Dry peel-apart imaging or proofing system
US6013409A (en) * 1996-09-10 2000-01-11 3M Innovative Properties Company Dry peel-apart imaging process

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