Printed matter – Strips
Reexamination Certificate
1999-06-10
2001-12-11
Fridie, Jr., Willmon (Department: 3722)
Printed matter
Strips
C283S061000, C283S101000, C428S042200
Reexamination Certificate
active
06328340
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns a form with a detachable card, a substrate material being glued to the back of the form, which substrate material at least partly covers the area of the card and comprises both a substrate layer and a peeling adhesive layer which loses its stickiness upon being detached, and the card being a punched product which is held in the form by the substrate layer and is produced by a punching carried out from the front of the form as far as the substrate layer.
Finally, the invention also concerns a substrate material and a multilayer material for forms of the type referred to above as well as a production process.
DESCRIPTION OF THE PRIOR ART
A form of the type referred to above is known, for example, from WO95/20493. In that case, the peeling adhesive layer has its typical properties with respect to the card. This means that the peeling adhesive layer develops a permanent adhesive effect with respect to the substrate layer but a non-permanent adhesive effect with respect to the card. The card can be detached from the form free from adhesive, the peeling adhesive layer remaining on the substrate layer. Since the card is not sticky, it can be used, for example, as an identity card or the like. A further property of the known peeling adhesive layer is that, after detaching the card, it no longer sticks where it is exposed. The form can therefore be subsequently used further and, for example, also be filed.
An important requirement for identity cards and also other cards is that they can be written or printed on and, as a result, once the form has been produced, it is possible, for example, to apply personal data. It is also intended that such writing or such an imprint cannot be subsequently changed, at least not easily, in particular in the case of identity cards, in the sense of a certain tamper-proof security.
It is customary to provide in the substrate material, before the peeling adhesive layer and the substrate layer as seen in the punching direction, also at least one permanent pressure-sensitive adhesive layer and an outer layer, for which at least one film is used. The rear surface of the detached card is plastified if a film is used and in this way is advantageously protected against moisture and other influences. There is generally also a similar outer layer on the front of the card. What is disadvantageous, however, about plastifying is that it is scarcely possible any longer to write or print onto the card after its removal. Although it is known in principle to make it possible for smooth film surfaces to be written or printed on by applying a special coating, such a coating would require at least an expensive, separate operation. With the coatings commonly used, moreover, there would be the difficulty of integrating them in a peeling adhesive system of the type referred to above, since all the currently known peeling adhesives develop a permanent adhesive effect with respect to said coatings, which would not allow nondestructive detachment of the cards.
It is known from the aforementioned WO95/204932 to make it possible to write on the back of the card by punching out a window in the substrate layer from the back and providing the film surface exposed in said window with a matt finish. However, additional operations are also necessary for this. Since the window is necessarily smaller than the card, the latter also cannot be written on over its full surface area.
It is known from forms with detachable self-adhesive labels (compare for example WO95/05281) to provide instead of a peeling adhesive layer a pressure-sensitive adhesive layer with a permanent adhesive effect on both sides and to use a silicone-treated release paper as the substrate layer. As a result, when the label is detached the pressure-sensitive adhesive layer comes away from the release paper and stays with the label. Since it is the intended purpose of self-adhesive labels to be able to be adhesively attached again, the pressure-sensitive adhesive must not lose its stickiness when the label is detached from the form.
SUMMARY OF THE INVENTION
The object of the invention is to specify a form of the type ref erred to at the beginning in which the back of the card can be written or printed on over its full surface area after detaching the card, in which the writing or imprint cannot be easily changed subsequently, in which a separate precoating of, for example, an outer or reinforcing film used is not required and in which both the rear surface of the card and the surface exposed in the form by detaching the card no longer stick after detaching the card.
This object is achieved according to the invention by a form having the features specified in patent claim
1
.
Whenever the back of the card is formed by a film, i.e. if a film is used for the form material or an additional outer layer contained in the substrate material, said film can be written and printed on through the peeling adhesive layer according to the invention on the detached card. The peeling adhesive layer according to the invention consequently has a dual function, making it unnecessary for the film surface to be coated in an additional and expensive operation (assuming that a coating suitable for this could be found in the first place).
A further advantageous property of the peeling adhesive layer according to the invention is that it is scarcely possible for writing or an imprint applied to it to be changed subsequently. This is so in particular in the case in which the back of the card is formed by a paper material. The card detached from the form according to the invention and then written on is consequently tamper-proof to an increased extent. In the case where the back of the card is of paper, it is virtually plastified by the peeling adhesive layer according to the invention and given water-repellent properties even without the use of a film.
The following composition may be chosen for the peeling adhesive of the peeling adhesive layer:
70-90%
mixture of an ethylene-containing copolymer, a
copolymeric ethyl acetate dispersion, an
acrylic resin copolymer and a polyvinyl acetate
polymer,
3-5%
aliphatic polyester urethane acrylate
1.5-2.5%
2-acrylic acid,
2-(((butylamino)carbonyl)oxy)ethylester,
12-18%
modified anionic pure acrylate copolymer
emulsion,
0-1.5%
wetting agent, and
0.5-1.5%
aliphatic polyfunctional isocyanurate.
The main component of the peeling adhesive formulation, the mixture of an ethylene-containing copolymer, an ethyl acetate dispersion, an acrylic resin copolymer and a polyvinyl acetate polymer, produces the actual peeling properties of the peeling adhesive. The adhesive force of this adhesive assumes a certain value, and the layer can be peeled off in a smooth, noiseless way and without leaving any residue. The polyvinyl acetate polymer, as the best re-emulsifiable and most water-sensitive component, makes it possible for the film to be printed on, in particular with ink-jet inks. The aliphatic polyester urethane acrylate increases the elasticity and water resistance of the film and improves the film strength as well as the anchorage on plastic surfaces. The substance 2-acrylic acid, 2-(((butylamino)carbonyl)oxy)ethylester serves as an addition to the aliphatic polyester urethane acrylate. Reactive groups present, such as amino or carbonyl groups for example, react simultaneously with pigments, which make possible a smudge-proof fixing of ink-jet inks, even if there is subsequent water contact of the film surface. The pure acrylate copolymer emulsion increases the film cohesion and closes its surface, which prevents excessive clouding of the film on contact with water. The wetting agent reduces the surface tension and consequently influences the rheology of the wet film and the wetting of the dry film by ink-jet inks in a positive sense. The aliphatic polyfunctional isocyanurate crosslinks the individual components and, like the aliphatic polyester urethane acrylate as well, improves the adhesion of the film on
Fofitec AG
Fridie Jr. Willmon
Morgan & Lewis & Bockius, LLP
LandOfFree
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