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
  • B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J31/00—Ink ribbons; Renovating or testing ink ribbons

Definitions

• Disposable writing tape with a carrier film and a color layer applied thereon which contains thermoplastic binders, colorants, vegetable oils and optionally auxiliaries for applying the color layer starting materials to the carrier film, as well as an advantageous process for its production.
• OCR tapes Optical Character Recognition
• MICR tapes Magnetic Ink Character Recognition
• EAN code tapes European Labeling Standard Tapes
• heat sealing tapes and correctable -Bands (cf. "Standards for color ribbons for the production of OCR characters", May 1981, published by the Federal Institute for Material Testing (BAM), Berlin-Dahlem, the DIN regulation 66 008, sheet 3, "International Standard Iso 1004 -1977 (E) ", August 1, 1978 and” ECMA Standard for the CMC 7 Printed Image Specification ", April 1964).
• the single-use writing tapes referred to in the subject contain a thermoplastic binder, colorants, auxiliaries for applying the color dispersion to the carrier film, vegetable oils and, if appropriate, wax materials. Defoaming agents, wetting agents, leveling agents and plasticizers, for example, are suitable as coating aids. These tapes are made by using the raw materials converted to an organic solvent and, if possible, dissolved in it. According to the definition of the colorants, the pigments remain unsolved. The plastic parts are regularly released. Accordingly, after the application of this coating liquid, the organic solvent, e.g. As toluene, gasoline, methyl ethyl ketone or isopropanol to evaporate, which means an environmental impact.
• the organic solvent e.g. As toluene, gasoline, methyl ethyl ketone or isopropanol to evaporate, which means an environmental impact.
• JP-A-62-108 090 relates to a writing tape with a color layer which contains a binder in the form of an ethylene-vinyl acetate copolymer, a resin of high melt viscosity and a colorant.
• the resin has a good affinity for the colorant, e.g. B. carbon black, and great dispersibility.
• good prints can be obtained even if the surface of the paper to be printed is rough. Erasing misprints is improved.
• EP-A-0 057 759 describes a resistance band for thermal transfer printing with a layer of polyvinyl acetate as the layer which is closest to the receiving layer to be printed.
• the polyvinyl acetate layer can be colored or uncolored. In the latter case, it covers a colored transfer layer, which can itself consist of polyvinyl acetate.
• EP-A-0 304 673 is concerned with a rewritable ink ribbon for thermal transfer printing with a layer of melting ink on one side of a carrier film.
• the melting ink contains a wax or a wax-like substance, colorant, a thermoplastic binder and optionally other additives.
• thermoplastic binder is the framework substance, in the cavities of which particles of a fat-soluble dye, a pigment and a wax or a wax-like substance are present in finely divided, solid form.
• the invention has for its object to develop the disposable tapes described above or to improve their manufacturing processes so that the desirable environmental friendliness is achieved.
• the colored layer has a polyalkylene oxide as a continuous builder, in which thermoplastic binder particles and droplets of the vegetable oil are finely dispersed and the vegetable oil is incompatible with the polyalkylene oxide.
• the disposable writing tape according to the invention can be produced particularly advantageously by a process in which an aqueous coating dispersion, which suspends the thermoplastic binder, contains a vegetable oil, coloring agent and other customary additives, is applied in a manner known per se to the carrier film of the writing tape and the aqueous or volatile portion of the dispersion is evaporated, and which is characterized in that a polyalkylene oxide is dissolved in the aqueous coating dispersion and a vegetable oil which is incompatible with the polyalkylene oxide is present.
• the essence of the invention is therefore that an aqueous coating dispersion containing the necessary starting materials, namely the polyalkylene oxide, the thermoplastic binder, the colorants and the vegetable oil incompatible with the polyalkylene oxide, each mandatory components, applied to the carrier film and there the volatile aqueous phase is evaporated.
• the necessary starting materials namely the polyalkylene oxide, the thermoplastic binder, the colorants and the vegetable oil incompatible with the polyalkylene oxide, each mandatory components
• the carrier film can be any thermoplastic film, in particular a 10 to 20 micron thick polyethylene film or a 2 to 15 micron thick polyester film.
• a paper carrier or a paper carrier laminated with aluminum can also be used. The starting materials and the thickness of the film are not critical for the effects sought with the invention.
• polyalkylene oxides are generally used which must be soluble in the aqueous phase.
• Polypropylene oxide and polyethylene oxide are suitable as particularly suitable polyalkylene oxides.
• the molecular weight is preferably between 800 and 20,000, in particular between 800 and 10,000.
• Their melting point is preferably 55 to 60 ° C.
• a special one vegetable oil can be selected, which shows an incompatibility with the polyalkylene oxide in the finished color layer on the carrier film.
• rape oil, sesame oil, corn oil and in particular castor oil are suitable as vegetable oils. Microscopic examinations show that this vegetable oil is dispersed in the form of very fine droplets in the continuous phase formed from the polyalkylene oxide. The diameter of these oil droplets is generally on the order of a few micrometers.
• thermoplastic binders can be used within the scope of the invention, such as, in particular, polystyrene, polyvinyl acetate, polyacetal, polyvinyl chloride, polyamide, polyethylene, copolymers of vinyl acetate and vinyl chloride, polyvinyl ether, polyvinyl propionates, acrylates, in particular acrylate copolymers, ethylene / vinyl acetate copolymers.
• Suitable plasticizers can also be used to control the hardness of the thermoplastic particles enclosed in the ink layer of the writing tape according to the invention.
• phthalic acid esters such as di-2-ethylhexyl phthalate, di-isononyl phthalate and di-isodecyl phthalate, aliphatic dicarboxylic acid esters such as that of adipic acid, especially di-2-ethylhexyl adipate and diisodecyl adipate, fatty acid esters such as triethylene glycol 2- (2-ethyl butyrate) .
• stabilizers such as di-2-ethylhexyl phthalate, di-isononyl phthalate and di-isodecyl phthalate
• aliphatic dicarboxylic acid esters such as that of adipic acid, especially di-2-ethylhexyl adipate and diisodecyl adipate
• fatty acid esters such as triethylene glycol 2- (2-ethyl butyrate
• Different colorants such as pigments and / or dyes, can be contained in the color layer of the writing tape according to the invention.
• Carbon black, chromium (II) oxide and / or iron (III) oxide are preferred as pigments. It has been shown that the pigments predominantly accumulate in the droplets of the vegetable oil when the writing tape according to the invention is finished.
• a special characteristic of the writing tape according to the invention can be seen in the fact that not only are the droplets of vegetable oil with pigment inclusion dispersed within the continuous polyalkylene oxide phase, but also the solid particles of the thermoplastic binder are present in the finest dispersion.
• the particle size of these solid particles can fluctuate widely and should regularly be between 0.1 and 10 micrometers, in particular between 0.1 and 1 micrometer.
• the finer the particles of this thermoplastic binder are distributed in the continuous polyalkylene oxide phase the better effects are achieved, for example a better edge definition of the printout achieved with this writing tape.
• thermoplastic binder promotes the smudge resistance and moisture resistance of the writing, which applies in particular to polymeric acrylates, such as in particular an acrylic copolymer in the form of Setalin AD 630-AQ 40. If this should be soluble in neutral or weakly acidic medium, then the aqueous medium is made alkaline, for example with ammonia, so that this ensures that it is present in suspended form in the coating liquid.
• the coating liquid containing the main components described above preferably contains water as the disperse phase.
• water as the disperse phase.
• other more or less environmentally compatible hydrophilic solvents such as isopropanol and / or ethanol, can be added to the water in suitable mixing ratios.
• the aim should be that water is predominantly present, since environmental friendliness is particularly evident here. If a water / ethanol mixture is used, the water content in this mixture should make up at least about 70% by weight, in particular about 85% by weight.
• the solids content of the finished coating liquid or initial dispersion can likewise vary within wide limits, for example between 20 and 80% by weight, preferably between 30 and 60 % By weight.
• various conventional additives can be added to favor further processing, such as dispersing aids, defoamers, wetting agents, leveling agents and the like.
• a suitable general formulation for carrying out the process according to the invention can be given: 30 to 50 parts by weight of water, 2 to 10 parts by weight of polyalkylene oxide, in particular polyethylene oxide, 10 to 15 parts by weight of ethanol, 2 to 10 parts by weight thermoplastic binder, in particular an acrylic copolymer, 0.5 to 5 parts by weight of vegetable oil, in particular castor oil, 5 to 15 parts by weight of colorant, in particular pigments, and as processing aid 0.5 to 2 parts by weight of defoamer, in particular Byk® 033 (mixture of hydrophobic components in paraffin-based mineral oil) and 0.1 to 0.5 part by weight of dispersant, in particular lecithin derivative.
• the aqueous coating dispersion can be applied to the carrier film in any manner, for example using a doctor blade, a roll coater, an air brush and by flexographic printing.
• the application technology is not critical.
• the coating liquid can also be evaporated or concentrated in any manner after application, for. B. by transferring warm air.
• the temperature of the applied aqueous coating dispersion should preferably be chosen only so high when the aqueous portion is evaporated or concentrated, optionally with a portion of hydrophilic other solvent, that the softening point of the thermoplastic binder contained therein is not exceeded. After evaporation, the color layer remains in the desired structure.
• a separating layer e.g. B. made of a silicone material.
• the thickness of this separating layer is preferably 0.5 to 2 micrometers.
• the advantages of the ink ribbon according to the invention are that it can be used in a wide range of uses, such as an OCR tape, MICR tape, EAN code tape, heat sealing tape and a correctable tape.
• a versatile tape was previously unknown. This variety of uses seems to be due to the special structure of the color layer of the writing tape according to the invention. Due to the low cohesion of the color layer, the characters and coding characters are shown particularly sharply.
• the stated proportion of thermoplastic binder in particular if it is an acrylic copolymer fraction, promotes the smudge resistance and the moisture resistance of the writing.
• the particular advantage of the writing tape according to the invention can also be seen in the fact that it can be produced in an environmentally friendly manner due to the use of an aqueous coating liquid, since organic solvents such as, for B. toluene and gasoline can be dispensed with.
• organic solvents such as, for B. toluene and gasoline can be dispensed with.
• An aqueous coating dispersion was prepared using the following recipe: water 48.3 parts by weight Polyethylene oxide (molecular weight about 6000) 6.0 parts by weight Ethanol 15.0 parts by weight thermoplastic binder polyvinyl acetate (sold by Wacker under the trade name CF 10) 16.5 parts by weight Defoamer in the form of Byk® 033 1.0 part by weight Dispersant in the form of soy lecithin 0.2 parts by weight vegetable oil in the form of castor oil 2.0 parts by weight Pigment (soot) 11.0 parts by weight 100 parts by weight
• the aqueous dispersion which made up a total of 100 parts by weight, was applied by means of a doctor blade in a layer thickness of approximately 20 micrometers (wet) to a polyethylene carrier of a thickness of approximately 10 micrometers.
• a doctor blade By passing warm air at a temperature of about 80 ° C, the aqueous portion of the applied dispersion, including the ethanol portion, was evaporated within a few minutes.
• the product obtained could be used directly as a writing tape.

Landscapes

• Inks, Pencil-Leads, Or Crayons (AREA)
• Impression-Transfer Materials And Handling Thereof (AREA)
• Paints Or Removers (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Laminated Bodies (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6351733

Family Applications (1)

Country Status (5)

Family Cites Families (4)

• 1988
  • 1988-04-11 DE DE3812001A patent/DE3812001A1/de active Granted
• 1989
  • 1989-04-04 AT AT89105844T patent/ATE83977T1/de not_active IP Right Cessation
  • 1989-04-04 EP EP89105844A patent/EP0338313B1/de not_active Expired - Lifetime
  • 1989-04-04 DE DE8989105844T patent/DE58903137D1/de not_active Expired - Fee Related
  • 1989-04-04 ES ES198989105844T patent/ES2037309T3/es not_active Expired - Lifetime
• 1993
  • 1993-01-27 GR GR930400146T patent/GR3006892T3/el unknown

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