EP0305922B1 - Anti-tacking adhesive surface for thermal-printing elements - Google Patents

Anti-tacking adhesive surface for thermal-printing elements Download PDF

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Publication number
EP0305922B1
EP0305922B1 EP88113958A EP88113958A EP0305922B1 EP 0305922 B1 EP0305922 B1 EP 0305922B1 EP 88113958 A EP88113958 A EP 88113958A EP 88113958 A EP88113958 A EP 88113958A EP 0305922 B1 EP0305922 B1 EP 0305922B1
Authority
EP
European Patent Office
Prior art keywords
acid
adhesive
dye
copolyester
thermal
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
EP88113958A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0305922A3 (en
EP0305922A2 (en
Inventor
Daniel Jude C/O Eastman Kodak Company Harrison
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0305922A2 publication Critical patent/EP0305922A2/en
Publication of EP0305922A3 publication Critical patent/EP0305922A3/en
Application granted granted Critical
Publication of EP0305922B1 publication Critical patent/EP0305922B1/en
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
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers

Definitions

  • This invention relates to the use of certain anti-tack adhesives used to laminate thermal print elements for protective and security purposes.
  • thermal transfer systems have been developed to obtain prints from pictures which have been generated electronically from a color video camera.
  • an electronic picture is first subjected to color separation by color filters.
  • the respective color-separated images are then converted into electrical signals.
  • These signals are then operated on to produce cyan, magenta and yellow electrical signals.
  • These signals are then transmitted to a thermal printer.
  • a cyan, magenta or yellow dye-donor element is placed face-to-face with a dye-receiving element.
  • the two are then inserted between a thermal printing head and a platen roller.
  • a line-type thermal printing head is used to apply heat from the back of the dye-donor sheet.
  • the thermal printing head has many heating elements and is heated up sequentially in response to the cyan, magenta and yellow signals. The process is then repeated for the other two colors. A color hard copy is thus obtained which corresponds to the original picture viewed on a screen. Further details of this process and an apparatus for carrying it out are contained in U.S. Patent No. 4,621,271 by Brownstein entitled “Apparatus and Method For Controlling A Thermal Printer Apparatus,” issued November 4, 1986.
  • ID cards identification cards
  • EPC Europay, MasterCard, and Visa
  • Heat-lamination of a cover sheet of polymeric film, such as polycarbonate or a polyester such as poly(ethyleneterephthalate), over the entire surface and extended sides of an ID card is an excellent way to increase protection from surface abrasion and to minimize tampering. Attempts to remove the cover sheet ideally should result in its destruction to prevent alteration and reuse.
  • European application Number 0.273.347 which constitutes prior art according to Article 54(3)(4) EPC, relates to an adhesive, meltable at a controlled temperature, that adheres rapidly, firmly and uniformly, to the ID card receiver layer surface, card support stock, and a protective cover sheet. That adhesive also does not adversely affect dye-stability nor alter definition of the thermal dye-transfer image or any auxiliary information on the card.
  • the "butterfly” pouch is formed by laminating two sheets of adhesive-coated cover sheet together at one edge, the adhesive surfaces being face-to-face, to form a V-shaped laminate.
  • one piece of adhesive-coated cover sheet could be used if folded in the middle.
  • thermo print element comprising a support having thereon a layer containing a thermally-transferred dye image, the element having at least one layer of adhesive thereon having an anti-tack surface, the anti-tack surface comprising at least 0.2 g/m2 of particulate material having a particle size up to 20 ⁇ m.
  • any particulate material can be used in the invention provided it has a particle size up to 20 ⁇ m and performs the desired function. In general, good results have been obtained with fumed silica, silica, alumina or polystyrene matte beads. In a preferred embodiment of the invention, the particulate material is fumed silica.
  • the particulate material can be present in any amount which is effective for the intended purpose. In general, good results have been obtained when the particulate material is present from 0.2 to 0.3 g/m2.
  • any adhesive used to laminate ID materials which has the tackiness problem described above would be useful in the invention.
  • adhesives include polyvinyl acetates, polyalkyl-acrylates, polyalkyl-methacrylates, polyalkyl-diacrylates, polyalkyl-dimethacrylates, polyvinyl chlorides, urea-formaldehydes, phenol-formaldehydes, polyurethanes, polyamides, polyimides, polysiloxanes, polysulfides, epoxy resins, natural rubbers, chloroprene rubbers, nitrile rubbers and other thermoplastic rubbers.
  • the adhesive comprises a linear, random copolyester of one or more aromatic dibasic acids and one or more aliphatic diols, modified with up to 30 mole % of one or more aliphatic dibasic acids, the copolyester having a melt viscosity of between 100 and 2,000 Pa.s (1,000 and 20,000 poise) at 150°C.
  • the aromatic dibasic acid of the copolyester adhesive is terephthalic acid, isophthalic acid, dipicolinic acid or 2,2-bis(p-carboxyphenyl)propane.
  • the aliphatic diol of the copolyester adhesive is ethyleneglycol, diethyleneglycol, triethyleneglycol, 1,4-butanediol, 1,2-propanediol, 1,3-propanediol, 1,6-hexanediol, cyclohexanedimethanol, or 1,4-cyclohexanediol.
  • the aliphatic dibasic acid of the copolyester adhesive is sebacic acid, glutaric acid, adipic acid, azelaic acid, or 1,4-cyclohexanedicarboxylic acid.
  • the adhesive layer may be solvent-coated or thermally-applied as a self-supporting layer to either or both sides of the thermal print element.
  • any thickness of adhesive may be used provided it provides a secure bond to the cover sheet and thermal print element. In general, good results have been obtained using thicknesses of from 5 to 100 ⁇ m.
  • the layer containing the dye image employed in the invention may comprise, for example, a polycarbonate, a polyurethane, a polyester, polyvinyl chloride, poly(styrene- co -acrylonitrile), poly(caprolactone) or mixtures thereof.
  • the dye image-receiving layer may be present in any amount which is effective for the intended purpose. In general, good results have been obtained at a concentration of from 1 to 5 g/m2.
  • a polycarbonate layer containing the dye image which has a number average molecular weight of at least 25,000.
  • polycarbonate as used herein means a polyester of carbonic acid and a glycol or an aromatic diol.
  • glycols or aromatic diols are p-xylene glycol, 2,2-bis(4-oxyphenyl)propane, bis(4-oxyphenyl)methane, 1,1-bis(4-oxyphenyl)ethane, 1,1-bis(oxyphenyl)butane, 1,1-bis(oxyphenyl)cyclohexane, 2,2-bis(oxyphenyl)butane, etc.
  • the above-described polycarbonate is a bisphenol A polycarbonate.
  • the bisphenol A polycarbonate comprises recurring units having the formula: wherein n is from 100 to 500.
  • polycarbonates examples include: General Electric Lexan® Polycarbonate Resin #ML-4735 (Number average molecular weight app. 36,000), and Bayer AG, Makrolon #5705® (Number average molecular weight app. 58,000).
  • the adhesives of the invention are used to laminate a cover sheet to one or both surfaces of the thermal print element.
  • the cover sheet for example, various polymeric transparent films such as poly(ethylene terephthalate), polycarbonate, polystyrene, polyethylene, cellulose acetate, poly(vinyl alcohol-co-acetal), etc.
  • copolyesters useful as the adhesive in the invention include the following materials:
  • the support for the thermal print element of the invention may be a transparent film such as a poly(ether sulfone), a polyimide, a cellulose ester such as cellulose acetate, a poly(vinyl alcohol-coacetal) or a poly(ethylene terephthalate).
  • the support may also be reflective such as baryta-coated paper, polyethylene-coated paper, white polyester (polyester with white pigment incorporated therein), an ivory paper, a condenser paper or a synthetic paper such as duPont Tyvek®.
  • polyester with a white pigment incorporated therein is employed. It may be employed at any thickness desired, usually from 50 ⁇ m to 1000 ⁇ m.
  • a dye-donor element that is used to form the thermal print element of the invention comprises a support having thereon a dye layer. Any dye can be used in such a layer provided it is transferable to the dye image-receiving layer of the dye-receiving element by the action of heat to provide the thermal print. Especially good results have been obtained with sublimable dyes such as those disclosed in U.S. Patent 4,541,830. The above dyes may be employed singly or in combination to obtain a monochrome. The dyes may be used at a coverage of from 0.05 to 1 g/m2 and are preferably hydrophobic.
  • the dye in the dye-donor element is dispersed in a polymeric binder such as a cellulose derivative, e.g., cellulose acetate hydrogen phthalate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose triacetate; a polycarbonate; poly(styrene-co-acrylonitrile), a poly(sulfone) or a poly(phenylene oxide).
  • the binder may be used at a coverage of from 0.1 to 5 g/m2.
  • the dye layer of the dye-donor element may be coated on the support or printed thereon by a printing technique such as a gravure process.
  • any material can be used as the support for the dye-donor element provided it is dimensionally stable and can withstand the heat of the thermal printing heads.
  • Such materials include polyesters such as poly(ethylene terephthalate); polyamides; polycarbonates; glassine paper; condenser paper; cellulose esters; fluorine polymers; polyethers; polyacetals; polyolefins; and polyimides.
  • the support generally has a thickness of from 2 to 30 ⁇ m. It may also be coated with a subbing layer, if desired.
  • the reverse side of the dye-donor element may be coated with a slipping layer to prevent the printing head from sticking to the dye-donor element.
  • a slipping layer would comprise a lubricating material such as a surface active agent, a liquid lubricant, a solid lubricant or mixtures thereof, with or without a polymeric binder.
  • dye-donor elements are used to form a dye transfer image in the thermal print.
  • Such a process comprises imagewise-heating a dye-donor element and transferring a dye image to a dye-receiving element as described above to form the dye transfer image in a thermal print element.
  • a dye-donor element which comprises a poly(ethylene terephthalate) support coated with sequential repeating areas of cyan, magenta and yellow dye, and the above process steps are sequentially performed for each color to obtain a three-color dye transfer image.
  • a monochrome dye transfer image is obtained.
  • a cover sheet laminate was prepared by coating 175 ⁇ m thick poly(ethylene terephthalate) with Compound 6, Bostik 7962® polyester adhesive described above, (0.076 g/m2) from dichloromethane. Before the adhesive layer was dry, a suspension of Cabogrip IIA® (Cabot Corp.), supplied as a 20% aqueous dispersion of colloidal ( ⁇ 1 ⁇ m) fumed silica, was coated at the level indicated in the Table over the adhesive layer. The fumed silica was coated from a methanol and water mixture without a binder and is thus a "wash overcoat" rather than a discrete overcoat.
  • Cabogrip IIA® Cabogrip IIA®
  • Testing for tackiness was done by first clarifying the coated adhesive by heating with a hot air gun for approximately three seconds. This removes the crystallinity by melting and brings the adhesive to its tackiest state. Two clarified sheets were then laminated, adhesive-face to adhesive-face, at room temperature with rollers. The level of tack between the two sheets was then estimated using an Instron Universal Testing Machine Model TM-1122. A one-inch wide sample was cut from the composite and formed into a T-peel joint for testing at a peel rate of 20 inches/min. The results obtained are tabulated in the Table.
  • the adhesion testing was done by laminating two cover sheets, adhesive-face to adhesive-face in a Kodak Readyprint Laminator (adjusted so that the adhesive reached 100°C).
  • the laminated sheets were allowed to come to room temperature and the adhesion was measured using the same test as described above. In practice, an imaged thermal transfer print would be placed between the two cover sheets.

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
EP88113958A 1987-08-31 1988-08-26 Anti-tacking adhesive surface for thermal-printing elements Expired - Lifetime EP0305922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9156887A 1987-08-31 1987-08-31
US91568 1987-08-31

Publications (3)

Publication Number Publication Date
EP0305922A2 EP0305922A2 (en) 1989-03-08
EP0305922A3 EP0305922A3 (en) 1990-07-11
EP0305922B1 true EP0305922B1 (en) 1992-12-09

Family

ID=22228457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113958A Expired - Lifetime EP0305922B1 (en) 1987-08-31 1988-08-26 Anti-tacking adhesive surface for thermal-printing elements

Country Status (4)

Country Link
EP (1) EP0305922B1 (enrdf_load_stackoverflow)
JP (1) JPS6471787A (enrdf_load_stackoverflow)
CA (1) CA1296894C (enrdf_load_stackoverflow)
DE (1) DE3876543T2 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0723875T3 (da) * 1989-01-31 2001-12-27 Dainippon Printing Co Ltd Fremgangsmåder til tilvejebringelse af varmeoverførte registreringer og varmeoverførte billedmodtagende ark
JP4034856B2 (ja) * 1997-10-07 2008-01-16 大日本印刷株式会社 熱転写シートおよび印画物

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273347A2 (en) * 1986-12-29 1988-07-06 EASTMAN KODAK COMPANY (a New Jersey corporation) Adhesives for laminating thermal print elements

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US4401721A (en) * 1981-11-19 1983-08-30 Dai Nippon Insatsu Kabushiki Kaisha Thermosensitive recording materials
JPS58149048A (ja) * 1982-03-02 1983-09-05 Sony Corp 昇華性染料の転写によるカラーハードコピー印画紙の形成方法
JPS59131496A (ja) * 1983-01-18 1984-07-28 Matsushita Electric Ind Co Ltd 染料転写体
JPS59101398A (ja) * 1982-12-01 1984-06-11 Matsushita Electric Ind Co Ltd 染料転写体
JPS59101399A (ja) * 1982-12-01 1984-06-11 Matsushita Electric Ind Co Ltd 染料転写体
JPS59131495A (ja) * 1983-01-18 1984-07-28 Matsushita Electric Ind Co Ltd 染料転写体
JPS6023096A (ja) * 1983-07-19 1985-02-05 Sony Corp カラ−ハ−ドコピ−印画紙用カバ−フィルム
US4628337A (en) * 1984-03-15 1986-12-09 Mitsubishi Paper Mills, Ltd. Reversible image-forming material
JPS60225797A (ja) * 1984-04-25 1985-11-11 Matsushita Electric Ind Co Ltd 感熱記録用転写体
JPS60229793A (ja) * 1984-04-27 1985-11-15 Matsushita Electric Ind Co Ltd 染料転写体
JPS60229790A (ja) * 1984-04-27 1985-11-15 Matsushita Electric Ind Co Ltd 染料転写体
JPS60229789A (ja) * 1984-04-27 1985-11-15 Matsushita Electric Ind Co Ltd 染料転写体
JPS6141598A (ja) * 1984-08-02 1986-02-27 Matsushita Electric Ind Co Ltd 感熱記録用転写体
JPS6157392A (ja) * 1984-08-29 1986-03-24 Nec Corp 熱転写用記録紙のカバ−フイルム
JPS6171428U (enrdf_load_stackoverflow) * 1984-10-15 1986-05-15
JPS61175090A (ja) * 1985-01-31 1986-08-06 Matsushita Electric Ind Co Ltd 感熱記録用転写体
JPS61177290A (ja) * 1985-02-01 1986-08-08 Canon Inc 感熱転写材
JPS61273989A (ja) * 1985-05-30 1986-12-04 Toppan Printing Co Ltd 感熱転写シ−ト
DE3683339D1 (de) * 1985-10-15 1992-02-20 Gao Ges Automation Org Ausweiskarte mit visuell sichtbarem echtheitsmerkmal und verfahren zur herstellung derselben.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273347A2 (en) * 1986-12-29 1988-07-06 EASTMAN KODAK COMPANY (a New Jersey corporation) Adhesives for laminating thermal print elements

Also Published As

Publication number Publication date
EP0305922A3 (en) 1990-07-11
JPS6471787A (en) 1989-03-16
EP0305922A2 (en) 1989-03-08
CA1296894C (en) 1992-03-10
DE3876543T2 (de) 1993-06-24
JPH0523959B2 (enrdf_load_stackoverflow) 1993-04-06
DE3876543D1 (de) 1993-01-21

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