EP0126906B1 - Matériel pour l'enregistrement/transfert thermosensible - Google Patents

Matériel pour l'enregistrement/transfert thermosensible Download PDF

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Publication number
EP0126906B1
EP0126906B1 EP84103623A EP84103623A EP0126906B1 EP 0126906 B1 EP0126906 B1 EP 0126906B1 EP 84103623 A EP84103623 A EP 84103623A EP 84103623 A EP84103623 A EP 84103623A EP 0126906 B1 EP0126906 B1 EP 0126906B1
Authority
EP
European Patent Office
Prior art keywords
heat
wax
coating
meltable
binder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84103623A
Other languages
German (de)
English (en)
Other versions
EP0126906A1 (fr
Inventor
Karl-Heinz Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renker & Co KG GmbH
Original Assignee
Renker & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renker & Co KG GmbH filed Critical Renker & Co KG GmbH
Priority to AT84103623T priority Critical patent/ATE28060T1/de
Publication of EP0126906A1 publication Critical patent/EP0126906A1/fr
Application granted granted Critical
Publication of EP0126906B1 publication Critical patent/EP0126906B1/fr
Expired legal-status Critical Current

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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
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
    • B41M5/395—Macromolecular additives, e.g. binders

Definitions

  • the invention relates to a heat-sensitive recording / transfer material with a heat-transferable backing coating on normal paper.
  • the invention is directed to the formation and composition of the hot-melt transfer layer for materials which are used in so-called thermal printers which have a thermal head.
  • DE-A-2 202 630 describes a color sheet for copying processes in which original sheets bearing an infrared radiation-absorbing image area, a copy sheet and a color sheet are placed on top of one another: Then, infrared light is irradiated so that the transfer of the color layer from the color sheet corresponds to the original image areas on the copy sheet.
  • the discontinuous transfer layer consists of heat-softenable particles which consist of a larger amount by weight of wax and a film-forming binder.
  • the softening point of the resin particles is in the range of about 66-104 ° C, with the softening product of the wax particles being in the range of about 66-93 ° C.
  • a heat-sensitive transfer material for thermal printers with a thermal head that has a thermal color development layer on the front of a suitable carrier material and a transferable hot melt color layer on the back, which is locally generated when generating color patterns in the thermal color developer layer the heat acting on the front is melted and transferred to a conventional office paper arranged underneath.
  • the hot-melt paint layer contains a heat-conducting color pigment and, as a binder, a solid wax with a penetration at 25 ° C of 10-30 and a viscosity of 20-200 mPa.s at 100 ° C.
  • a solid wax with a penetration at 25 ° C of 10-30 and a viscosity of 20-200 mPa.s at 100 ° C.
  • other hot-melt materials such as low molecular weight polyethylene, oxidized wax and ester waxes can also be used as binders. According to the information in the publication, the viscosity of the ink layer must be in the range given, because the viscosity significantly influences the transferability of the hot-melt ink layer.
  • the known transfer material has the following disadvantages: If the thermal recording device is operated for a longer period of time, the transfer deteriorates considerably because the softening point of the wax layer is too low with the claimed penetration capacity. The color intensity of the copy is not sufficient for numerous purposes. When used in facsimile machines, the common passage of the transmission material and the recording duplicate sheet is often disturbed because the sheets move against one another because of the smooth surfaces.
  • the object of the present invention is to improve the properties of the transfer material described in DE-A-3 043 866.
  • the heat-sensitive recording / transfer material for thermal printers with a thermal head with a hot melt layer arranged on the back of a thin carrier material, which can be transferred by heat acting on the front, and which contains a color pigment, a wax as a binder and customary auxiliaries, characterized in that that the hot melt layer contains a vinyl acetate copolymer polyethylene wax, a modified hydrocarbon wax or a mixture thereof with a softening temperature of 95-115 ° C. and a film-forming thermoplastic binder in a weight ratio of 10: 1 to 30: 1, so that the layer has a melting point of 101-11 0 ° C.
  • the modified hydrocarbon wax is, for example, an oxidized polyethylene wax.
  • the hot melt layer is preferably present in an amount of 2-12 g / m 2 on a carrier sheet with a basis weight of 6-30 g / m 2 .
  • the material according to the invention can have on the front side a known heat-sensitive recording layer which contains an initially colorless color former, a color developer and a heat-melting substance which dissolves one or both reactants.
  • the invention also includes a process for producing a heat-sensitive recording material, which is characterized in that the fusible waxes, the thermoplastic binder and a viscosity regulator are dissolved in an organic solvent or solvent mixture, the solution is rapidly cooled with stirring or in a non-solvent liquid Mixing formation of a finely divided dispersion, mixed into the dispersion, the color pigment and the coating composition applied to the carrier sheet and dried.
  • the transferable hot melt layer contains from 12 to 30 parts by weight of oxidized polyethylene wax, vinyl acetate copolymer polyethylene wax, or another modified hydrocarbon wax or a mixture thereof with a softening point between 95 and 115 ° C., from 0.5 to 5 parts by weight.
  • An oxidized PE wax with a softening point between 102 and 106 ° C and a needle penetration according to ASTM D 5 of 4-9 has proven to be particularly suitable.
  • waxes have an average molecular weight of 1500-2000 and a viscosity in the range of 150-200 mPa.s (Brookfield) at 140 ° C.
  • the melt viscosity of this wax is 120 ° C in the range of 140-160 mPa.s (Brookfield).
  • the modification of the hydrocarbon wax makes it possible to produce a very finely divided dispersion in organic solvents which can be used for the coating mixture of the hot-melt layer.
  • the other wax components mentioned are also distinguished by the fact that they can easily be processed into dispersions in organic solvents with very fine particles.
  • Reactive polyamide resins, reactive phenolic resins, resin ester products can be used as the film-forming thermoplastic component for solidification.
  • a thermoplastic polyamide resin with a softening point according to DIN 1995 of 105-115 ° C and a viscosity of 2.1-2.7 mPa.s at 165 ° C has proven to be particularly suitable.
  • Black pigments such as carbon black, graphite or the like, but also finely divided metal powders such as aluminum, copper, tin or the like can be used as the heat-conducting color pigment. By using a heat-conducting pigment, the melting behavior of the hot melt layer and the transferability are improved.
  • Colored carbon blacks with particle sizes between 20 and 60 1 1 m are particularly suitable.
  • the hot melt layer is applied to the back of a suitable thin carrier material such as paper, in particular thin printing paper, cable insulating papers, condenser papers, parchment papers, wax raw and ignition coil papers or films such as polyester films, polypropyl films.
  • a suitable thin carrier material such as paper, in particular thin printing paper, cable insulating papers, condenser papers, parchment papers, wax raw and ignition coil papers or films such as polyester films, polypropyl films.
  • the carrier materials have a basis weight between 6 and 30 g / m 2 and are usually 15 ⁇ m thick.
  • a coating composition is produced by heating and dissolving the wax or the wax mixture and the film-forming thermoplastic binder together with a dispersing aid and / or viscosity regulator in a suitable solvent or solvent mixture.
  • Suitable solvents are toluene, isopropanol, special gasoline, chlorinated hydrocarbons, xylene or mixtures thereof.
  • Products which are soluble in organic solvents for example alkyl-modified polyvinylpyrrolidone with a molecular weight between 7,000 and 20,000 and whose melting range is below 100 ° C., preferably below 50 ° C., are suitable as viscosity regulators or dispersing agents.
  • This solution is then rapidly cooled with stirring or poured into a non-solvent liquid in order to produce a finely divided dispersion of the melt layer components in the liquid phase.
  • the color pigment is then dispersed into this dispersion using suitable devices.
  • the coating composition is then applied to one side of a carrier material using conventional application units, such as knife and blade spreading heads, and the solvent is evaporated off.
  • the application weight of the continuous layer is from 2 to 12 g / m 2 , preferably from 3 to 6 g / m 2.
  • the layer has a melting point of 101 ° -110 ° C, preferably 104 ° -108 ° C.
  • a thermally responsive color development layer can be applied to the front of the carrier material before or after the application of the hot melt transfer layer.
  • This layer is approximately 2 to 10 11 m thick with an application weight of 2 to 10 g / m 2 . It contains a color former and as a reaction partner a so-called acceptor and a heat-fusible compound which, in the molten state, makes contact with the color-forming reaction partners for the reaction.
  • acceptor a so-called acceptor and a heat-fusible compound which, in the molten state, makes contact with the color-forming reaction partners for the reaction.
  • Such layers are known and are described, for example, in DE-A 2 211 984 or 2 934 378.
  • the transfer material according to the invention can also have only one hot-melt layer on the back, which is transferred to an underlying recording sheet by contact of the front with the hot pen of such recording devices.
  • Preparation of the coating composition for the hot melt layer are dissolved hot in the specified solvent mixture and the solution is then rapidly cooled with stirring, so that a finely divided dispersion results as a result of the supersaturation.
  • the coating composition obtained is applied with a doctor blade to satinized paper of up to 25 ⁇ m thick or a film made of polyester or polypropylene.
  • the first step is to create a matt layer of paint that can be polished to a shine with a hairbrush, thereby enabling much more intense and sharper contours.
  • Preparation of the coating composition for the hot melt layer are dissolved hot in the solvent mixture indicated and cooled analogously to Example 1 and a finely divided dispersion is formed, into which 7 g of carbon black with a particle size of 55 ⁇ m and a BET surface area of 50 m 2 / g are dispersed.
  • the dispersion is then, as indicated in Example 1, optionally diluted with toluene and applied to a polyester film as the carrier material.
  • Preparation of the coating composition are dissolved hot as in Example 1 and converted into a finely divided dispersion.
  • the coating composition is applied to a thin printing paper with an application weight of 5 g / m 2 (atro) using conventional equipment and dried.
  • thermosensitive recording layer can be applied to the front of the carrier material.
  • the coating composition comprising a color former and an acceptor or color developer and a fusible component is applied uniformly to the carrier web and dried using conventional devices such as roller doctor blades or the like.
  • a base paper with a thickness of 25-30 ⁇ m and a Bekk smoothness of 200 to 1000 seconds is used.
  • the opacity should be such that the brightest possible thermosensitive front layer is present after the recording.
  • the advantage of the invention Recording / transfer material for thermal printers with a thermal head consists in the fact that by using the waxes mentioned from the dispersion, the melting point of the ink layer is significantly increased, and even when the thermal printer is started up over a longer period of time, the transferability and the transferred color image remain substantially more constant in their intensity and uniformity than with known materials.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Laminated Bodies (AREA)

Claims (4)

1. Matière thermosensible d'enregistrement et de transfert pour appareils de thermographie, présentant une couche fusible à chaud transférable par de la chaleur agissant sur le recto, disposée sur le verso d'une matière support mince et qui contient un pigment coloré, une cire comme liant et des adjuvants usuels, caractérisée par le fait que la couche fusible à chaud contient de la cire de copolymère d'acétate de vinyle et de polyéthylène, une cire d'hydrocarbures modifiée ou un mélange de celles-ci ayant une température de ramollissement de 95 à 115°C et un liant thermoplastique filmogène en un rapport de poids de 10 : 1 à 30 : 1 de sorte que la couche présente un point de fusion de 101 à 110°C.
2. Matière thermosensible d'enregistrement et de transfert selon la revendication 1, caractérisée par le fait que la couche fusible à chaud est présente en une quantite de 2 à 12 g/m sur une matière support ayant une masse surfacique de 6 à 30 g/m2.
3. Matière thermosensible d'enregistrement et de transfert selon la revendication 1, caractérisée en ce qu'elle présente au recto une couche d'enregistrement thermosensible en elle-même connue qui contient un chromogène tout d'abord incolore, un révélateur chromogène et un corps fondant à chaud et dissolvant l'un des réactifs ou tous les deux.
4. Procédé pour la fabrication d'une matière d'enregistrement thermosensible selon la revendication 1, caractérisé par le fait que l'on dissout les cires fusibles, le liant thermoplastique et un régulateur de viscosité dans un solvant organique ou mélange de solvants, que l'on refroidit rapidement la solution sous agitation ou qu'on l'incorpore à un liquide non solvant avec formation d'une dispersion à fines particules, que l'on incorpore à la dispersion le pigment coloré, que l'on applique la masse de revêtement sur la feuille support et qu'on la sèche.
EP84103623A 1983-04-27 1984-04-02 Matériel pour l'enregistrement/transfert thermosensible Expired EP0126906B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103623T ATE28060T1 (de) 1983-04-27 1984-04-02 Waermeempfindliches aufzeichnungs/uebertragungsmaterial.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3315249A DE3315249C2 (de) 1983-04-27 1983-04-27 Wärmeempfindliches Aufzeichnungs/Übertragungsmaterial sowie Verfahren zu dessen Herstellung
DE3315249 1983-04-27

Publications (2)

Publication Number Publication Date
EP0126906A1 EP0126906A1 (fr) 1984-12-05
EP0126906B1 true EP0126906B1 (fr) 1987-07-01

Family

ID=6197488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103623A Expired EP0126906B1 (fr) 1983-04-27 1984-04-02 Matériel pour l'enregistrement/transfert thermosensible

Country Status (3)

Country Link
EP (1) EP0126906B1 (fr)
AT (1) ATE28060T1 (fr)
DE (2) DE3315249C2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6147296A (ja) * 1984-08-13 1986-03-07 General Kk 多数回使用感熱転写媒体
DE3520308A1 (de) * 1985-06-07 1986-12-11 Pelikan Ag, 3000 Hannover Verfahren zur herstellung eines thermofarbbandes fuer den thermotransferdruck und das danach erhaeltliche thermofarbband
JPS6213387A (ja) * 1985-07-12 1987-01-22 Canon Inc 感熱転写記録方法
EP0214770B1 (fr) * 1985-08-12 1992-11-19 General Company Limited Matériel thermosensible pour l'enregistrement par transfert
JP2644999B2 (ja) * 1986-11-19 1997-08-25 花王株式会社 熱転写用インク
DE3812001A1 (de) * 1988-04-11 1989-10-19 Pelikan Ag Schreibband und verfahren zu dessen herstellung
DE3825437C1 (fr) * 1988-07-27 1989-11-16 Pelikan Ag, 3000 Hannover, De
JP2513830B2 (ja) * 1989-03-20 1996-07-03 富士通株式会社 熱転写インクシ―ト
US5268052A (en) * 1989-04-27 1993-12-07 Canon Kabushiki Kaisha Thermal transfer material and thermal transfer recording method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL253609A (fr) * 1959-07-08
GB943682A (en) * 1959-11-03 1963-12-04 Labelon Tape Co Inc Thermographic method for copying indicia
NL283006A (fr) * 1961-09-09
US3368989A (en) * 1963-07-02 1968-02-13 Pacific Ind Inc Image transfer compositions comprising ethylene-vinyl acetate or ethyleneethyl acrylate copolymer, wax and incompatible plasticizer
US3751318A (en) * 1971-01-25 1973-08-07 Columbia Ribbon Carbon Mfg Thermographic transfer process
JPS5675894A (en) * 1979-11-26 1981-06-23 Nippon Telegr & Teleph Corp <Ntt> Thermal recording medium
IT1145104B (it) * 1981-09-21 1986-11-05 Olivetti & Co Spa Elemento inchiostrato termosensibile per stampanti senza impatto di tipo termico

Also Published As

Publication number Publication date
ATE28060T1 (de) 1987-07-15
DE3464476D1 (en) 1987-08-06
DE3315249A1 (de) 1984-10-31
DE3315249C2 (de) 1987-01-22
EP0126906A1 (fr) 1984-12-05

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