Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
  • G03G9/087—Binders for toner particles
  • G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • G03G9/08755—Polyesters
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
  • G03G7/002—Organic components thereof
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
  • G03G7/002—Organic components thereof
  • G03G7/0026—Organic components thereof being macromolecular
  • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
  • G03G9/12—Developers with toner particles in liquid developer mixtures
  • G03G9/122—Developers with toner particles in liquid developer mixtures characterised by the colouring agents
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
  • G03G9/12—Developers with toner particles in liquid developer mixtures
  • G03G9/125—Developers with toner particles in liquid developer mixtures characterised by the liquid
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
  • G03G9/12—Developers with toner particles in liquid developer mixtures
  • G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components

Definitions

• the present invention relates to a method for printing substrates by means of digital offset printing, a toner consisting of pigment polymer particles in a hydrocarbon carrier liquid is used, as well as the substrates and their coating.
• the process of digital offset printing combines the flexibility of Xerography with the high resolution and color brilliance of offset printing.
• the digital template is transformed directly into an electrostatic image on the photo image plate implemented, transferred to the printing roller and then printed on the substrate. Since no print template has to be created, in principle, just like with the Xerography a new motif can be printed with each printing process.
• the toner like in lithographic offset printing, it is an ink or paste, so that the limitation of the resolution at the Xerography in digital offset printing is avoided.
• the desired high Dissolution requires a special toner made up of pigment polymer particles a hydrocarbon carrier liquid. Printing presses and corresponding toners are commercially available from Indigo N.V., the Netherlands available. These toners are described, inter alia, in U.S. Patents 6,146,803 and 5,935,754.
• WO 01/22172 A1 describes coating the substrates to be printed with a coating which contains at least 25% SiO 2 .
• Coatings made from UV-curable acrylic esters, acrylic copolymers, styrene-acrylic copolymers, polyvinyl alcohols, diamine-terminated poly (propylene oxide) and polyethylene terephthalates are mentioned. However, the applicability of such a coating is limited.
• the present invention is therefore based on the object of a method for To provide printing on substrates with which the advantageous properties of digital offset printing can be fully used.
• a coating consists of a Ethylene-acrylic acid copolymer printing on a wide variety of substrates the special toner in digital offset printing.
• the object is accordingly achieved by a method for printing on substrates by means of digital offset printing with a toner which contains pigment polymer particles in a hydrocarbon carrier liquid, the substrate being provided with a coating prior to printing which comprises at least 25% of a copolymer Ethylene and an acrylic acid of formula I.
• CH 2 CR 1 -COOR 2 in which R 1 is H or CH 3 and R 2 is H or an alkyl radical having 1 to 6 C atoms, and optionally contains further polymers and auxiliaries.
• Statistical and block copolymers of ethylene and (meth) acrylic acid and (meth) acrylic acid alkyl esters are suitable as ethylene-acrylic acid copolymer.
• the alkyl ester group optionally has 1 to 6 C atoms, in particular 1 to 3 C atoms, ie R 2 preferably represents methyl, ethyl, propyl, butyl, pentyl or hexyl and in particular CH 3 , C 2 H 5 or C. 3 H 7 .
• (Meth) acrylic acid means methacrylic acid, acrylic acid or mixtures thereof.
• ethylene-acrylic acid copolymer ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer and mixtures of two or more thereof are particularly suitable.
• Ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer, in particular ethylene-acrylic acid copolymer are particularly preferred.
• propylene and other polyolefin copolymers can be used instead of ethylene copolymers, but this is not preferred from the point of view of cost.
• Copolymers of ethylene and acrylic acids of the formula I have been known for a long time and commercially available.
• the average molecular weight is typically Range from 100,000 to 1,000,000. Usually more than 50 mol%, preferably contain more than 80 mol% of ethylene monomers.
• the copolymers are used according to the invention as an aqueous dispersion.
• the dispersions can usual additives such as emulsifiers, dispersants, stabilizers etc. contain.
• the invention is based on ethylene-acrylic acid copolymer for the sake of simplicity described, it goes without saying that all the others above mentioned copolymers can be used equally.
• the weight per unit area of the coating is 1 to 30 g / m 2 , preferably approximately 2 to 3 g / m 2 .
• the substrate also includes plastics, ceramics and glass and metal into consideration.
• the invention therefore relates to a method for printing transfer papers for textiles, a release paper having a release layer of silicone or wax and a coating of 75 parts of a copolymer of ethylene and an acrylic acid of the formula I.
• CH 2 CR 1 -COOR 2 in which R 1 is H or CH 3 and R 2 is H or an alkyl radical having 1 to 6 carbon atoms, 0 to 25 parts of a polyurethane and 0 to 20 parts of silica gel and, if appropriate, other customary auxiliaries are provided.
• the release paper typically has a basis weight of 80 to 150 g / m 2 , preferably 90 to 100 g / m 2 .
• the release layer usually has a basis weight of about 2 g / m 2 for silicone and about 20 g / m 2 for wax.
• the coating is advantageously applied by applying an aqueous dispersion of the constituents, for example by means of a doctor knife, and has a weight per unit area in the range from 10 to 30 g / m 2 . Dispersions with solids contents in the range from 5 to 40% work well.
• the transfer paper coated and printed according to the invention is then in is known to be placed on the textile and by the action of heat and print transfer the representation to the textile.
• the invention relates to a method for printing transfer papers for colored or black textiles.
• the printed layer must be covered with a second one Release paper covered and the print after peeling the first one Release paper with the adhesive layer are applied to the textile. Thereby the printed layer side comes to lie on the surface where it is special is claimed.
• An adhesive layer composed of a mixture of ethylene-acrylic acid copolymer, polyurethane and ethylene-vinyl acetate copolymer with a basis weight of 10 to 20 g / m 2 is advantageously used on a release paper as described above.
• the white layer consists of a white pigment such as TiO 2 , BaSO 4 or CaCO 3 in a binder consisting of 75 parts of a copolymer of ethylene and an acrylic acid of the formula I.
• CH 2 CR 1 -COOR 2 in which R 1 is H or CH 3 and R 2 is H or an alkyl radical having 1 to 6 carbon atoms and 0 to 25 parts of a polyurethane and, if appropriate, other customary auxiliaries.
• the weight per unit area is advantageously about 20 to 30 g / m 2 , the white pigment content 5 to 25% by weight.
• the coating to be printed is preferably applied over the white layer. This contains 75 parts of a copolymer of ethylene and an acrylic acid of the formula I.
• CH 2 CR 1 -COOR 2 in which R 1 is H or CH 3 and R 2 is H or an alkyl radical having 1 to 6 carbon atoms, 0 to 25 parts of a polyurethane and 0 to 20 parts of silica gel and, if appropriate, other customary auxiliaries and has a weight per unit area of 10 to 20 g / m 2 .
• the invention relates to a method for printing in particular hard surfaces by means of transfer papers.
• Transfer papers for this purpose are described in German Patent Application No. 197 03 731.3.
• the transfer paper then has a separating layer made of a polyolefin or polyolefin copolymer with a melt index according to ASTM-D-1238 (MFI) of 3.5 to 22/10 min on a commercial paper suitable for xerography. at 2.16 kg / 190 ° C with a basis weight of 20 to 50 g / m 2 .
• MFI melt index according to ASTM-D-1238
• CH 2 CR 1 -COOR 2 in which R 1 is H or CH 3 and R 2 is H or an alkyl radical having 1 to 6 carbon atoms, and 0 to 25 parts of a polyurethane and, if appropriate, other customary auxiliaries with a weight per unit area of 2 to 10, preferably 2 to 3 g / m 2 applied.
• transfer papers are particularly suitable for the transfer of prints to metal, Suitable for ceramic and plastic surfaces.
• the coated and printed transfer paper on the hard surface made of metal, ceramic, plastic etc. hung up and transferred the representation by means of pressure and heat. ever after whether the release paper is warm or after cooling subtracted, you either get a transfer of the pressure with a part the plastic layer or just a transfer of the pressure.
• the latter is Particularly desirable for metal surfaces, so that the metallic shine the parts of the surface that are not filled in by the representation are preserved. mostly will not be a square, corresponding to the size of the transfer paper Transfer presentation.
• a plain paper with a basis weight of 90 g / m 2 was coated with a 25% aqueous dispersion of an ethylene-acrylic acid copolymer by means of a doctor blade. After drying, the coating was 2-3 g / m 2 thick.
• This paper was printed in a digital offset printing machine (Indigo NV, the Netherlands) with Elektrolnk ® (Indigo NV, the Netherlands). The print quality was excellent. No aging of the paper could be observed in a period of 3 years. Even after repeated heating and cooling, no observable post-hardening occurs.
• a commercially available release paper was first provided with a release coating made of silicone, which was dried to a basis weight of 2 g / m 2 .
• a color representation was printed on this transfer paper in a digital offset printing machine (Indigo NV, The Netherlands) with Elektrolnk ® (Indigo NV, The Netherlands).
• the transfer paper was then placed on a T-shirt, the T-shirt placed in an ironing press and the pressure was transferred to the textile at a temperature of between about 180 to 200 ° C. in about 10 to 20 seconds. After cooling, the release paper was removed.
• the print quality on the textile was excellent and was not affected by several washes at 40 ° C.
• a commercially available release paper was first provided with an adhesive coating composed of a mixture of EEA, PU and EVA, which was dried to a basis weight of 15 g / m 2 .
• a dispersion of 75 parts of an ethylene-acrylic acid copolymer (25% by weight in water), 25 parts of a polyurethane (40% by weight in water) and 20 parts of TiO 2 as a white pigment (40% by weight) was then applied using a doctor blade. -% applied in water) as well as other usual auxiliaries. After drying, the coating had a weight per unit area of 25 g / m 2 .
• a commercially available normal paper was first provided with a separating layer made of an ethylene-vinyl acetate copolymer with 7 to 18% by weight of vinyl acetate groups, which was dried to a basis weight of 40 g / m 2 .
• a dispersion of 75 parts of an ethylene-acrylic acid copolymer (25% by weight in water) and 25 parts of a polyurethane (40% by weight in water) and other customary auxiliaries was applied by means of a doctor knife. After drying, the coating had a basis weight of 2 g / m 2 .
• a color representation was printed on this transfer paper in a digital offset printing machine (Indigo NV, The Netherlands) with Elektrolnk ® (Indigo NV, The Netherlands). The transfer paper was then placed on a cup and transferred by the action of heat in a device known per se. After cooling, the release paper was removed. The print quality was excellent.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (8)

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Citations (5)

• 2001
  • 2001-07-06 DE DE2001132884 patent/DE10132884A1/de not_active Withdrawn
• 2002
  • 2002-07-01 EP EP02013652A patent/EP1273975A1/fr not_active Withdrawn

Patent Citations (5)

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