EP0845711A1 - Method for preparing a security document with a toner accepting layer - Google Patents
Method for preparing a security document with a toner accepting layer Download PDFInfo
- Publication number
- EP0845711A1 EP0845711A1 EP97203597A EP97203597A EP0845711A1 EP 0845711 A1 EP0845711 A1 EP 0845711A1 EP 97203597 A EP97203597 A EP 97203597A EP 97203597 A EP97203597 A EP 97203597A EP 0845711 A1 EP0845711 A1 EP 0845711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- preparing
- security document
- accepting layer
- toner accepting
- 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.)
- Granted
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention provides a method for preparing a security
document comprising the step of printing with a laser printer on an
imaging element comprising a support and a toner accepting layer,
characterized in that said toner accepting layer is a layer
comprising a copolymer of ethylene and acrylic acid.
Description
The present invention relates to a print, more particularly to a
tamperproof identification document.
Identification documents essentially comprise a card or sheet
material containing information retaining to the bearer. Generally
a portion of the information is in the form of a photograph.
Identification cards (I.D. cards) are used e.g. to establish a
person's authorization to conduct certain activities (driver's
licence) or the authorization to have access to certain
areas(employee I.D. cards) or to engage in credit transactions (I.D.
credit cards).
In view of the widespread use of I.D. cards, especially in
commercial transactions such as cashing checks, credit purchases,
etc., it is important that the information contained in the I.D.
card cannot be altered and that the I.D. card gives maximum
protection against counterfeiting by alteration and/or replacement
of its data and photograph.
Many of these security documents are nowadays prepared by
digitally recording by means of a black-and-white laser printer.
However an increasing number of these security documents are
recorded in full color with color laser printers. The obtained color
image is fixed by means of moderately heated fixation rollers which
are treated with a silicone oil in order to prevent that the color
toner should adhere to said fixation rollers during the fixation.
However during said fixation some of the silicone oil adheres to the
toner accepting layer. This is the cause of different problems.
First of all, the adhesion of the color toner to the toner
accepting layer is weak, so that by scratching the image can be
removed. Furtheron said accepting layer after it is printed with
toner can not be laminated anymore due to the fact that silicone oil
is present. These problems also arise with black toners although
not to such an extent.
It is an object of the present invention to provide a method for
producing a security document which has a strong adhesion of a
toner, especially of a color toner to the toner accepting layer.
It is a further object of the present invention to provide a
method for producing a security document wherein the accepting layer
after it is printed with toner can be laminated to a strong
laminate.
According to the present invention there is provided a method
for preparing a security document comprising the step of printing
with a laser printer on an imaging element comprising a support and
a toner accepting layer, characterized in that said toner accepting
layer is a layer comprising a copolymer of ethylene and acrylic
acid.
A toner accepting layer in the present disclosure is every
layer capable of accepting toner from laser color printing
equipment. Said toner may be a black toner but is preferably a
color toner. According to the invention said toner accepting layer
is a layer comprising a copolymer of ethylene and acrylic acid.
Preferably said layer is a layer comprising at least 80 % by weight
of said copolymer, more preferably said layer consist of said
copolymer.
A copolymer of ethylene and acrylic acid according to the
invention comprises preferably between 10% and 50 % by weight of
acrylic acid, more preferably between 13 % and 35 % by weight of
acrylic acid, most preferably between 17 % and 25 % by weight of
acrylic acid.
A copolymer of ethylene and acrylic acid according to the
invention has preferably a melt index between 100 and 10000, more
preferably a melt index between 300 and 3000. A copolymer of
ethylene and acrylic acid according to the invention has preferably
a weight average molecular weight between 10000 and 100000, more
preferably between 15000 and 30000.
A copolymer of ethylene and acrylic acid according to the
invention is preferably used at a pH between 3 and 10, more
preferably at a pH between 6 and 9. In order to obtain said pH, a
solution or dispersion of a copolymer according to the invention is
completely or partially neutralized with an alkali base or buffer
salt or more preferably with ammonia.
Copolymers of ethylene and acrylic acid are commercially
available under the name of PRIMACOR from Dow Chemicals, Michigan,
USA.
A toner accepting layer according to the invention is preferably
present in a weight between 0.5 g/m2 and 30 g/m2, more preferably
between 1.0 g/m2 and 15 g/m2, most preferably between 2.0 g/m2 and
8.0 g/m2.
The support in accordance with the invention is preferably a
flexible support. Said flexible support can be transparent or
opaque.
The opaque support is e.g. an opaque paper support or resin
coated paper support, e.g. polyolefin coated paper and polyethylene
coated paper of which the polyethylene layer may contain opacity
providing pigments such as white TiO2 particles as described e.g. in
EP-A 324 192. Preferably security paper is used.
Other opaque supports that may be used are resin supports
containing in their resin mass dispersed white pigments, e.g. TiO2,
or are such resin supports that contain said pigments dispersed in
the resin mass in the presence of light-straying microvoids as
described e.g. in EP 349152. Organic resins used for manufacturing
said supports, e.g. by extrusion, are polycarbonate, polyester,
preferably poly(ethylene terephthalate) or poly(ethylene
naphthalate), poly (methylacrylaat-styrene-acrylonitrile), poly
(acrylonitrile-butadiene-styrene), polyamides, polyethersulfones,
polyetherketones, polystyrene, poly-Alpha-olefins such as
polypropylene or polyethylene, polyvinyl acetals and homo- and
copolymers of vinyl chloride. Further are mentioned cellulose
esters e.g. cellulose triacetate.
Transparent or translucent supports may be transparent or
translucent organic resins e.g. the resins cited above. Preferred
transparent or translucent supports are films of polyesters such as
poly(ethylene terephthalate) or of poly-Alpha-olefins such as
polyethylene.
The toner accepting layer may be present contiguous to the
support. Preferably there are layers present between the toner
accepting layer according to the invention and the support. Such
layers can be subbing layers to improve the adhesion between the
support and the toner accepting layer. Such layer can also be an
information carrier, at least part of the information being present
in the toner image receiving layer.
It is required when said imaging element is used as a security document to laminate said imaging element either by laminating a laminating foil against the support of the imaging element or by providing a laminating foil at one outer side of the imaging element and another laminating foil at the other outer side of the imaging element and laminating these laminating foils together. The use of a pouch structure wherein only the border parts of the plastic sheets are sealed is not preferred for security documents because they are not sufficiently tamperproof since after cutting around the edge the pouch can be opened and some information can be removed or transformed before resealing the pouch.
It is required when said imaging element is used as a security document to laminate said imaging element either by laminating a laminating foil against the support of the imaging element or by providing a laminating foil at one outer side of the imaging element and another laminating foil at the other outer side of the imaging element and laminating these laminating foils together. The use of a pouch structure wherein only the border parts of the plastic sheets are sealed is not preferred for security documents because they are not sufficiently tamperproof since after cutting around the edge the pouch can be opened and some information can be removed or transformed before resealing the pouch.
Therefore, to avoid said shortcoming a "security seal" is
established between the toner accepting layer of the document and
the laminating foil. As described in US-P 4,151,666 the security
seal makes that if one should succeed in the removal of the plastic
cover sheet also a substantial portion of the information containing
part of the document should be removed too so that a damaged part
remains adhering partly or totally to said plastic cover sheet.
In a security document according to the invention comprising a
toner accepting layer comprising a copolymer of ethylene and acrylic
acid an effective security seal is easily made between the toner
accepting layer and a laminating foil when a laminating foil is
laminated to the toner accepting layer.
One laminating foil can be a single layer of an organic resin
e.g. a polyethylene, a polypropylene film or a polyester film.
A laminating foil has preferably a thickness of only 0.050 to
0.200 mm. A sheet of that thickness can still be manipulated easily
in a mechanical printing process, e.g. offset or intaglio printing,
and can receive security or verification marks in the form of e.g. a
watermark, finger prints, printed patterns known from bank notes,
coded information, e.g. binary code information, signature or other
printed personal data or marks that may be applied with livid
crystals, fluorescent pigments, nacreous pigments giving special
light-reflection effects, and/or visibly legible or
ultraviolet-legible printing inks as described e.g. in GB-P
1,518,946 and US-P 4,105,333.
Further security features are infrared-absorbing markings,
mildly radioactive isotope patterns, magnetic dots or strips and
electronic microcircuits hidden from visibility.
At least one of the laminating foils and optionally both of the
laminating elements comprises an outer resin layer and an inner
resin layer. By "inner resin layer" of a laminating element
comprising an inner and an outer resin layer is meant the resin
layer which after lamination is nearest to the toner accepting
layer. The "outer resin layer" is then the layer of said laminating
element which after lamination becomes an outside layer of said
security document.
Said outer resin layer can be any transparent or translucent
organic resin e.g. cellulose acetate film, poly(vinyl acetal) film,
polystyrene film, polycarbonate film or polyvinyl chloride film.
Preferably said outer resin layer is a poly(ethylene terephthalate)
film, more preferably an oriented poly(ethylene terephthalate) film.
Said inner resin layer can be any transparent or translucent
melt-adhesive layer comprising an organic resin having a lower glass
transition temperature (Tg) and melting temperature (Tm) than the
outer resin layer. Preferably the glass transition temperature of
the resin comprised in the inner resin layer is at least 20°C, more
preferably at least 40°C lower than the glass transition temperature
of the resin comprised in the outer resin layer. Most preferably
said inner resin layer is a polyalkylene layer, particularly
preferably a polyethylene layer. In this connection reference is
made to the Tg values of polyethylene, polypropylene, polyvinyl
chloride and polyethylene terephthalate being -20°C, +5°C, +80°C and
+67°C respectively (see J.Chem. Educ., Vol. 61, No. 8. August 1984,
p. 668).
In a preferred embodiment the toner accepting layer is coated on
a laminating foil which after the generation of information on or in
the toner accepting layer can be laminated to a support, preferably
a flexible opaque support, most preferably paper such as security
paper.
The optical information can be partly applied directly on the
support of the information carrier by printing techniques. Suitable
printing processes are e.g. planographic offset printing, gravure
printing, intaglio printing, screen printing, flexographic printing,
relief printing, tampon printing, ink jet printing, laser printing,
thermal transfer printing, dye diffusion thermal transfer printing
and toner-transfer printing from electro(photo)graphic recording
materials.
On said support can be applied security or verification marks in
the form of e.g. a watermark, finger prints, printed patterns known
from bank notes, coded information, e.g. binary code information,
signature or other printed personal data or marks or layers that may
be applied with liquid crystals, fluorescent pigments, nacreous
pigments giving special light-reflection effects, and/or visibly
legible or ultraviolet-legible printing inks as described e.g. in
GB-P 1,518,946 and US-P 4,105,333.
The image on said imaging element is at least partially
generated in or on the toner accepting layer by exposure of the
imaging element to a laser printer, preferably a color laser printer
followed by a fixation, preferably a thermal fixation of the
obtained image.
The following example illustrates the present invention
withouthowever limiting it thereto.
All parts, ratios and percentages are by weight unless otherwise
stated.
A 65 µm thick transparent polyethylene therephthalate film is
coated with a layer comprising 0.5 g/m2 of gelatine and a latex of
polyester-polyurethane at 400 mg/m2 of solid product. Thereon was
coated a layer containing 0.7 g/m2 of carboxymethylcellulose, 1.4
g/m2 of gelatine, 3.10-3 mmole/m2 of silver sulphide nuclei, 18.10-3
mmole/m2 of nickel sulphide nuclei and 1.7g/m2 of a nacreous
pigment. On top of said layer is coated a layer containing 0.5 g/m2
of gelatine.
A 65 µm thick transparent polyethylene therephthalate film is
coated with a layer comprising 0.35 g/m2 of gelatine, 1,50 g/m2 of a
nacreous pigment and 3.4 g/m2 of a copolymer of ethylene and acrylic
acid (7:1). On said layer was coated a layer comprising 4 g/m2 of a
copolymer of ethylene and acrylic acid (7:1).
An identical image was in an identical way recorded and fixed on
the two imaging elements with a color laser printer Phaser 550 from
Tektronix, Oregon, USA. The adhesion of the image was qualitatively
evaluated by scratching with a fingernail across the image. The
image obtained with imaging element I (comparison element) was
easily removed while the image obtained with imaging element II
(element according to the invention) stayed intact even after
vigourous scratching.
When said imaged elements are laminated to a security paper
support, said paper support can be delaminated from the imaged
element without damage to the support in the case of imaging element
I while there is serious damage to the support in the case of
imaging element II.
Claims (9)
- A method for preparing a security document comprising the step of printing with a laser printer on an imaging element comprising a support and a toner accepting layer, characterized in that said toner accepting layer is a layer comprising a copolymer of ethylene and acrylic acid.
- A method for preparing a security document according to claim 1 wherein said toner accepting layer comprises at least 80 % by weight of said copolymer.
- A method for preparing a security document according to claim 1 or 2 wherein said copolymer comprises between 10% and 50 % by weight of acrylic acid.
- A method for preparing a security document according to claim 3 wherein said copolymer comprises between 13 % and 35 % by weight of acrylic acid.
- A method for preparing a security document according to any of claims 1 to 4 wherein said copolymer has a weight average molecular weight between 10000 and 100000.
- A method for preparing a security document according to any of claims 1 to 5 wherein said toner accepting layer has a pH between 3 and 10.
- A method for preparing a security document according to any of claims 1 to 6 wherein said toner accepting layer is present in a weight between 0.5 g/m2 and 30 g/m2,
- A method for preparing a security document according to any of claims 1 to 6 wherein said support is a flexible transparent or opaque support.
- A method for preparing a security document according to any of claims 1 to 8 whereinthe support of the imaging element is a flexible transparent support,said imaging element is after imaging with a laser printer laminated to paper e.g. security paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970203597 EP0845711B1 (en) | 1996-11-29 | 1997-11-18 | Method for preparing a security document with a toner accepting layer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96119164 | 1996-11-29 | ||
| EP96119164 | 1996-11-29 | ||
| EP19970203597 EP0845711B1 (en) | 1996-11-29 | 1997-11-18 | Method for preparing a security document with a toner accepting layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0845711A1 true EP0845711A1 (en) | 1998-06-03 |
| EP0845711B1 EP0845711B1 (en) | 2000-10-04 |
Family
ID=26142325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19970203597 Expired - Lifetime EP0845711B1 (en) | 1996-11-29 | 1997-11-18 | Method for preparing a security document with a toner accepting layer |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0845711B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1273975A1 (en) * | 2001-07-06 | 2003-01-08 | Bülent Öz | Method for printing substrates by digital offset printing using toner |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI113807B (en) | 2001-12-07 | 2004-06-15 | Stora Enso Oyj | Digital printing method and paper or paperboard suitable for this |
| WO2008070921A1 (en) * | 2006-12-13 | 2008-06-19 | Prime Genetics Ltd | A tamper indicating device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2454047A1 (en) * | 1973-11-14 | 1975-05-15 | Copyer Co | Electrostatographic recording matl. with dielectric binder layer - contg. ethylene copolymer with (meth)acrylic acid and pref. calcium carbonate |
| DE2952322A1 (en) * | 1979-12-24 | 1981-07-02 | Agfa-Gevaert Ag, 5090 Leverkusen | Documents resistant to falsification - are coated with a transparent plastic film bonded with radiation curable adhesive |
| EP0424343A2 (en) * | 1989-10-17 | 1991-04-24 | International Paper Company | Paper for use in ion deposition printing |
| US5045426A (en) * | 1989-06-21 | 1991-09-03 | The Standard Register Company | Toner adhesion-enhancing coating for security documents |
| DE19510974A1 (en) * | 1995-03-24 | 1996-09-26 | Drescher Geschaeftsdrucke | Single-ply paper product |
-
1997
- 1997-11-18 EP EP19970203597 patent/EP0845711B1/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2454047A1 (en) * | 1973-11-14 | 1975-05-15 | Copyer Co | Electrostatographic recording matl. with dielectric binder layer - contg. ethylene copolymer with (meth)acrylic acid and pref. calcium carbonate |
| DE2952322A1 (en) * | 1979-12-24 | 1981-07-02 | Agfa-Gevaert Ag, 5090 Leverkusen | Documents resistant to falsification - are coated with a transparent plastic film bonded with radiation curable adhesive |
| US5045426A (en) * | 1989-06-21 | 1991-09-03 | The Standard Register Company | Toner adhesion-enhancing coating for security documents |
| EP0424343A2 (en) * | 1989-10-17 | 1991-04-24 | International Paper Company | Paper for use in ion deposition printing |
| DE19510974A1 (en) * | 1995-03-24 | 1996-09-26 | Drescher Geschaeftsdrucke | Single-ply paper product |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1273975A1 (en) * | 2001-07-06 | 2003-01-08 | Bülent Öz | Method for printing substrates by digital offset printing using toner |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0845711B1 (en) | 2000-10-04 |
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