EP0912349B1 - Feuille intermediaire autographique pour impression par transfert thermique - Google Patents

Feuille intermediaire autographique pour impression par transfert thermique Download PDF

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Publication number
EP0912349B1
EP0912349B1 EP97929396A EP97929396A EP0912349B1 EP 0912349 B1 EP0912349 B1 EP 0912349B1 EP 97929396 A EP97929396 A EP 97929396A EP 97929396 A EP97929396 A EP 97929396A EP 0912349 B1 EP0912349 B1 EP 0912349B1
Authority
EP
European Patent Office
Prior art keywords
intermediate sheet
retransfer
binder
protective
backcoat
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 - Lifetime
Application number
EP97929396A
Other languages
German (de)
English (en)
Other versions
EP0912349A1 (fr
Inventor
Christopher Paul Richardson
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.)
Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of EP0912349A1 publication Critical patent/EP0912349A1/fr
Application granted granted Critical
Publication of EP0912349B1 publication Critical patent/EP0912349B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/0256—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet the transferable ink pattern being obtained by means of a computer driven printer, e.g. an ink jet or laser printer, or by electrographic means
    • 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes

Definitions

  • the invention relates to thermal transfer printing of an article by forming an image in an intermediate sheet by thermal transfer and thereafter thermally retransferring the image to a dye-receptive layer on the article; and in particular to the composition of the retransfer intermediate sheet.
  • Thermal transfer printing is a process in which one or more thermally transferable dyes are caused to transfer from selected areas of a dye-donor sheet to a receiver by thermal stimuli, thereby to form an image. This is generally carried out in a printer having a thermal head or laser energy source, depending on the kind of dye-donor sheet used.
  • a dye-donor sheet comprising a thin substrate supporting a dyecoat containing one or more uniformly spread dyes
  • printing is effected by heating selected discrete areas of the dye-donor sheet while the dyecoat is pressed against a dye-receptive surface of a receiver sheet, thereby causing dye to transfer to corresponding areas of the receiver.
  • the shape of the image transferred is determined by the number and locations of the discrete areas which are subjected to heating.
  • Full colour prints can be produced by printing with different coloured dyecoats sequentially in like manner, and the different coloured dyecoats are usually provided as discrete uniform panels arranged in a repeated sequence along a ribbon-shaped dye-donor sheet.
  • thermal retransfer In order to print articles other than flexible sheets, one method that is commonly used is thermal retransfer. This is a two stage process, employing a retransfer intermediate sheet comprising a supporting substrate having a dye-receptive imageable layer on one side, usually with a backcoat on the other side to promote good transport through the initial printer.
  • a retransfer intermediate sheet comprising a supporting substrate having a dye-receptive imageable layer on one side, usually with a backcoat on the other side to promote good transport through the initial printer.
  • an image is formed as above by pressing together a dye-donor sheet and the imageable layer of the intermediate sheet, and applying heat to selected positions of the dye-donor sheet to cause transfer of dye into that imageable layer, thereby to produce the image.
  • the image-containing intermediate sheet is then separated from the dye-donor sheet, and in the second stage of the process, is pressed against the article, with its image-containing layer contacting a dye-receptive surface of the article.
  • Heat is then applied to effect transfer of the image, usually over the whole area of the image simultaneously and in a press shaped to accommodate the article.
  • heated rolls may be used to provide the heat as the intermediate sheet and article are fed through.
  • thermal retransfer techniques can be used for printing laminar articles such as stiff cards, they are of particular applicability to the printing of three dimensional articles such as mugs. See EP-A-0 672 542 and WO-A-94/05505.
  • the proportion which does retransfer depends on, amongst other things, the composition of the dye-receptive surface of the article. This may be the natural surface of that article where the latter is formed of an appropriately dye-receptive material, but in most instances it is usual first to provide the article with a coating to form a surface of enhanced dye-receptivity.
  • a further factor influencing the degree of retransfer is the amount of heat applied in the second, i.e. retransfer, stage.
  • Heated presses shaped according to the mug or other article to be printed have been sold by a number of manufacturers, and typically these develop temperatures of 140-180°C. Under such conditions, the intermediate sheet can degrade, leaving debris in the press and ultimately sticking to the press when it is opened, causing defects to occur in the retransferred image.
  • JP-A-01099888 and JP-A-01241491 disclose various receiver sheets for thermal transfer printing.
  • one aspect of the invention provides a re-transfer intermediate sheet for thermal transfer printing of an article by thermal retransfer, the intermediate sheet comprising a supporting substrate having on one side an imageable layer and on the other a backcoat, wherein the backcoat is a heat-resistant layer comprising a polymeric binder and a protective particulate filler in an amount of at least 100% by weight of the binder.
  • a method of printing an article having a dye-receptive surface comprises the steps of pressing together a dye-donor sheet and an imageable layer of a retransfer intermediate sheet comprising a supporting substrate having on one side the imageable layer and on the other a backcoat, forming an image in the imageable layer by thermal transfer printing, pressing the thus-formed image-containing layer against the dye-receptive surface of the article, and applying heat to the intermediate sheet to effect retransfer of the image to the dye-receptive layer of the article, characterised in that the backcoat is a heat-resistant layer comprising a polymeric binder and a protective particulate filler in an amount of at least 50% by weight of the binder.
  • the protective filler most suitably comprises mainly particles of 1-10 ⁇ m mean diameter.
  • the type of particle is less critical than the proportion used relative to the binder, although other properties may influence the optimum choice.
  • organic particles in the form of a poly(alkylsilylsesquioxane) compound, such as the methyl substituted compounds marketed in various particle sizes under the trade mark Tospearl, by Toshiba.
  • inorganic particulates such as hydrated alumina and the like.
  • organic particles are generally preferred, in view of the more abrasive nature of compositions with high loadings of hydrated alumina.
  • poly(alkylsilylsesquioxane) particulate compounds available commercially include KMP-590 (Shinetsu Chemical); Tospeari 105, Tospearl 108, Tospearl 120, Tospearl 130, Tospearl 145 and Tospearl 240 (Toshiba Silicone); and Torefil R-925 and Torefil 930 (Toray Dow Corning) (Torefil is a Trade Mark).
  • a metal phosphate salt of stearic acid in an amount of from 1 to 20% of the binder, to stabilise the solution and improve manufacturability. It may similarly be added to compositions containing lower particle loadings, but the lower the loading levels, the less is this of benefit.
  • our preferred range for the amount of protective filler is generally from 100% to 250% by weight of the binder.
  • the protective 1-10 ⁇ m particles it may be necessary to use less of the protective 1-10 ⁇ m particles than the maximum quantity that could otherwise be used.
  • examples of such other particles which may usefully be added include slightly larger particles added as an anti-blocking agent to improve handling.
  • Our preferred anti-blocking agent comprises particles of 8-15 ⁇ m mean diameter, in an amount of 10-25% by weight of the binder.
  • Suitable binders include cellulosic resins, such as cellulose acetate proprionate and cellulose acetate butyrate.
  • the binder need not be cross-linked in order to benefit in terms of heat resistance from the present high loadings of particulates. However, we generally do prefer to provide some degree of cross-linking by the addition of small amounts of crosslinking agent.
  • the cellulose resins can be crosslinked by isocyanates or by melamine cross linking agents in acid conditions.
  • the dried backcoat of the invention is preferably within a thickness range of 1-10 ⁇ m, especially 1-5 ⁇ m, as thicker backcoats provide little extra protection, and lead to lower versatility, especially during the first, image-forming, stage.
  • the supporting substrate may typically be paper, especially polyolefin-coated paper. This is a support material which provides a very good quality of retransferred image, but which was particularly prone to heat induced problems during retransfer prior to the protection afforded by the present backcoats.
  • a backcoat composition A was prepared, and coated onto a substrate of polyethylene coated paper, then dried to give a coating of thickness 3 ⁇ m.
  • An imageable layer had previously been coated onto the other side of the polyethylene coated paper, to complete a retransfer intermediate sheet according to the invention.
  • CAP cellulose acetate proprionate
  • composition B Tospearl 120 at 100 % by weight of the binder
  • Composition C Tospearl 120 at 50 % by weight of the binder
  • Composition D Apyral at 100 % by weight of the binder (Apyral is a trade mark of QLT in respect of hydrated alumina filler)
  • Each intermediate sheet was printed with blocks of colour, in a thermal transfer printer whose heat source was a thermal head having a row of programmable pixel heaters, in normal manner.
  • a thermal transfer printer whose heat source was a thermal head having a row of programmable pixel heaters, in normal manner.
  • each imaged intermediate sheet was placed in the press together with a mug precoated with a resin to give a dye-receptive surface against which was placed the imaged layer of the intermediate sheet.
  • the press was then activated to apply heat and pressure to the back of the intermediate sheet, to thermally retransfer dyes from the intermediate sheet into the dye-receptive surface layer of the mug.
  • the press was opened, and the printed mug removed.
  • a retransfer intermediate sheet according to the invention was prepared essentially as described in Example 1, except that a anti-blocking agent was also added to the backcoat composition (composition E) to improve handling.
  • backcoat composition E cellulose acetate proprionate (CAP) (482-0.5 - from Eastman Kodak) 100 parts by weight Tospearl 120 (protective particles - 2.0 ⁇ m mean diameter) 200 parts by weight Pergopak (anti-block particles - 8-15 ⁇ m mean diameter) 17 parts by weight calcium stearyl phosphate (stabiliser) 10 parts by weight Beetle 692 (melamine cross-linker) 5.0 parts by weight p-toluene sulphonic acid catalyst 1.0 parts by weight Atmer 190 (antistatic agent) 1.5 parts by weight Tegomer 2311 (silicone levelling agent) 0.1 parts by weight (Pergopak is a trade mark of Martinswerk)
  • the retransfer intermediate sheet thus prepared was used to print mugs in a standard mug-printing press, essentially as described for Examples 1-4. Handling during printing was excellent. When the press was opened and the printed mug removed after the retransfer process, both the press and the image retransferred into the mug were examined and found to be in excellent condition, with no significant degradation of the retransfer sheet being apparent.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (14)

  1. Feuille intermédiaire autographique pour l'impression par transfert thermique d'un article par report thermique, comprenant un substrat de support dont un côté porte une couche pouvant recevoir une image et dont l'autre porte un revêtement de renforcement, dans laquelle le revêtement de renforcement est une couche résistant à la chaleur comprenant un liant polymère et une charge particulaire de protection, caractérisée en ce que la charge particulaire de protection est incluse en une quantité d'au moins 100% en poids par rapport au liant.
  2. Procédé d'impression d'un article ayant une surface réceptive à un colorant comprenant les étapes de pressage ensemble d'une feuille donneur de colorant et d'une couche pouvant recevoir une image d'une feuille intermédiaire autographique comprenant un substrat de support dont un côté porte la couche pouvant recevoir une image et l'autre un revêtement de renforcement, de formation d'une image dans la couche pouvant recevoir une image par impression par transfert thermique, de pressage de la couche contenant l'image ainsi formée contre la surface réceptive à un colorant de l'article, et d'application de chaleur à la feuille intermédiaire pour effectuer le report de l'image sur la couche réceptive à un colorant de l'article, dans lequel le revêtement de renforcement est une couche résistant à la chaleur comprenant un liant polymère et une charge particulaire de protection, caractérisée en ce que la charge particulaire de protection est incluse en une quantité d'au moins 100% en poids par rapport au liant.
  3. Feuille intermédiaire autographique suivant la revendication 1, dans laquelle la charge de protection comprend principalement des particules ayant un diamètre moyen de 1 à 10 µm.
  4. Feuille intermédiaire autographique suivant la revendication 3, dans laquelle la charge de protection comprend principalement des particules organiques.
  5. Feuille intermédiaire autographique suivant la revendication 4, dans laquelle les particules organiques comprennent un poly(alkylsilylsesquioxane).
  6. Feuille intermédiaire autographique suivant la revendication 3, dans laquelle la charge de protection comprend principalement des particules inorganiques.
  7. Feuille intermédiaire autographique suivant la revendication 3, dans laquelle les compositions de revêtement de renforcement contiennent la charge de protection en une quantité d'au moins 200% en poids par rapport au liant.
  8. Feuille intermédiaire autographique suivant la revendication 3, dans laquelle les compositions de revêtement de renforcement contiennent la charge de protection en une quantité de 100% à 250% en poids par rapport au liant.
  9. Feuille intermédiaire autographique suivant la revendication 1, dans laquelle la couche résistant à la chaleur contient un agent antiblocage comprenant des particules ayant un diamètre moyen de 8 à 15 µm, en une quantité de 10 à 25% en poids par rapport au liant.
  10. Feuille intermédiaire autographique suivant la revendication 1, dans laquelle la composition de revêtement de renforcement contient un phosphate sel de métal d'acide stéarique en une quantité de 1 à 20% en poids par rapport au liant.
  11. Feuille intermédiaire autographique suivant la revendication 1, dans laquelle le liant est une résine cellulosique.
  12. Feuille intermédiaire autographique suivant la revendication 1, dans laquelle le liant polymère est réticulé.
  13. Feuille intermédiaire autographique pour l'impression par transfert thermique d'un article par report thermique, comprenant un substrat de support dont un côté porte une couche pouvant recevoir une image et dont l'autre porte un revêtement de renforcement, dans laquelle le revêtement de renforcement est une couche résistant à la chaleur comprenant un liant polymère et une charge particulaire de protection, caractérisée en ce que la charge particulaire de protection est choisie parmi des composés de type poly(alkylsilylsesquioxane et des charges de type alumine hydratée en une quantité d'au moins 100% en poids par rapport au liant
  14. Feuille intermédiaire autographique suivant la revendication 12, dans laquelle la charge de protection comprend des particules de poly(méthylsilylsesquioxane) ayant un diamètre moyen de 1 à 10 µm.
EP97929396A 1996-07-16 1997-07-03 Feuille intermediaire autographique pour impression par transfert thermique Expired - Lifetime EP0912349B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9614898.6A GB9614898D0 (en) 1996-07-16 1996-07-16 Retransfer intermediate sheet
GB9614898 1996-07-16
PCT/GB1997/001760 WO1998002315A1 (fr) 1996-07-16 1997-07-03 Feuille intermediaire autographique pour impression par transfert thermique

Publications (2)

Publication Number Publication Date
EP0912349A1 EP0912349A1 (fr) 1999-05-06
EP0912349B1 true EP0912349B1 (fr) 2000-06-07

Family

ID=10796982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97929396A Expired - Lifetime EP0912349B1 (fr) 1996-07-16 1997-07-03 Feuille intermediaire autographique pour impression par transfert thermique

Country Status (5)

Country Link
EP (1) EP0912349B1 (fr)
JP (1) JP2000514377A (fr)
DE (1) DE69702258T2 (fr)
GB (1) GB9614898D0 (fr)
WO (1) WO1998002315A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001240800A (ja) * 2000-02-25 2001-09-04 Nippon Sheet Glass Co Ltd 所定表面形状を有する物品の製造方法
GB0100330D0 (en) * 2001-01-06 2001-02-14 Ici Plc Improvements in or relating to thermal transfer printing
WO2002094581A1 (fr) 2001-05-22 2002-11-28 Micyte Limited Appareil et procede de transfert d'image
GB0113332D0 (en) 2001-06-01 2001-07-25 Ici Plc Improvements in or relating to thermal transfer printing
GB0711052D0 (en) 2007-06-08 2007-07-18 Ici Plc Thermal transfer printing
GB0712105D0 (en) 2007-06-22 2007-08-01 Ici Plc Thermal transfer printing
GB0721127D0 (en) 2007-10-27 2007-12-05 Ici Plc Thermal transfer printing
JP5553098B2 (ja) * 2011-09-30 2014-07-16 大日本印刷株式会社 熱転写シート
WO2013129415A1 (fr) * 2012-02-29 2013-09-06 大日本印刷株式会社 Support de transfert intermédiaire
JP5370517B2 (ja) * 2012-02-29 2013-12-18 大日本印刷株式会社 中間転写媒体
JP5370516B2 (ja) * 2012-02-29 2013-12-18 大日本印刷株式会社 中間転写媒体
JP5370518B2 (ja) * 2012-02-29 2013-12-18 大日本印刷株式会社 中間転写媒体
WO2021256482A1 (fr) * 2020-06-16 2021-12-23 凸版印刷株式会社 Feuille d'estampage à chaud
US20220105740A1 (en) * 2020-10-02 2022-04-07 Illinois Tool Works Inc. Multi-Color Retransfer Single Stamping System And Method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9124302D0 (en) * 1991-11-15 1992-01-08 Ici Plc Thermal transfer printing receiver
WO1994005505A1 (fr) * 1992-09-01 1994-03-17 Imperial Chemical Industries Plc Feuille de reception d'impression par transfert thermique
EP0672542B1 (fr) * 1994-03-18 1999-02-10 Dai Nippon Printing Co., Ltd. Méthode pour former une image sur un objet

Also Published As

Publication number Publication date
WO1998002315A1 (fr) 1998-01-22
DE69702258D1 (de) 2000-07-13
GB9614898D0 (en) 1996-09-04
JP2000514377A (ja) 2000-10-31
EP0912349A1 (fr) 1999-05-06
DE69702258T2 (de) 2000-10-12

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