Process for producing electronic cards and cards obtained thereby

- 28036 Madrid

ES 2 138 807 T3

DESCRIPTION

Electronic card manufacturing procedure.

The invention relates to a method of manufacturing electronic cards, as well as to cards obtained by means of said method.

The word card should be considered, in the present invention, in a broad sense, and includes in particular any portable object of standardized dimensions that comprises, on the one hand, a micro-module, and on the other hand, a body that serves as a portable support. However, the invention points in particular to chip cards, and among said cards, to cards that work without contact, in which the micromodule is connected to an antenna to carry out the electromagnetic transmission of the data. In the following, a contactless card is understood to be a card that has exclusively contactless operation, or also a hybrid card that has a contactless operation and a classic operation with contacts.

The manufacture of electronic cards in large series can be carried out using various procedures.

Some procedures involve the injection, at a temperature higher than 90 ° C and under strong pressure, of the order of 700 kg / cm², of a viscous thermoplastic material polymerized, in the molten state, in a closed cavity of a mold. After cooling below its melting point, this material forms a thickness of the card body.

However, processes of this type do not offer the possibility of easily adjusting the viscosity of the injected plastic material. Now, in the conception of a process for the manufacture of cards by injection, it is necessary to carry out numerous tests, in particular varying the viscosity of the injected material to ultimately achieve an industrially acceptable process that does not present any defect.

EPA 0570784 describes a process for the manufacture of a card of the contactless type, according to which a binder is spread on a work surface in liquid form, and preferably, with a sufficient viscosity so that it does not spread too much. An electronic module is immersed in the layer formed by said binder.

The object of the present invention is to propose a process for the manufacture of electronic cards in large series, which overcomes, at a minimal cost, the aforementioned drawbacks, and which allows in particular to easily adjust the viscosity of the injected or dispensed plastic material.

Another objective of the invention is to make it possible to obtain card thicknesses whose characteristics, such as adhesion, rigidity or resistance to temperature, can be easily regulated and controlled.

These objectives, as well as others that will appear in the following, are achieved thanks to a process according to which, to manufacture the card, a mixture comprising a low-viscosity liquid monomer is spread. By adding a third body it was then possible to regulate the viscosity of the mixture comprising said monoomer.

The object of the invention is therefore a process for the manufacture of an electronic card, as defined in claim 1.

The following description, which does not imply any limitation, will allow a better understanding of the way in which the invention can be put into practice.

The following should be read, based on the attached figures, where:

- Figure 1A shows, in cross section, a contact card obtained by a procedure according to the invention.

- Figure 1B shows, in cross section, a contactless card obtained by a process according to the invention;

- Figure 2 illustrates the reactive scheme used in a procedure according to the invention; Y

- Figure 3 illustrates, schematically, a way of using the procedure of the invention.

In the example of the present description, the electronic cards 1 correspond to the ISO 7810 standard. They comprise a micro-module 2 and a card body 3.

The card body 3 is a thin rectangular paralalepoped, the overall dimensions of which are of the order of 85 mm in length, 54 mm in width and 0.76 mm in thickness. It comprises n overlapping layers. The number n can be equal to 1. However, in the general case it is greater than 1. In the example of Figures 1A and 1B, it is equal to 3, and the card body 3 then comprises an upper layer 4, a lower layer 5, and a sublayer 6.

The micro-module 2 is inserted into the card body 3. It is in contact with a layer of polymerized plastics of the card body 3, for example the sub-layer 6. It comprises an integrated circuit chip 7 and connection terminals 8.

In the case of a contact card (figure

IA), the connection terminals 8 are connected to some metallized contact plots 9 that emerge on the surface of the card body 3 and form metallizations 10.

In the case of a contactless card (figure

IB), the connection terminals 8 are connected to contact areas 11 of an antenna 12 included in the card body 3. The antenna 12 is formed, either by a coil of metallic wire, whose diameter is of the order of 30 μm Either by a metallized or plywood dielectric of a metal with a thickness of the order of 80 µm, or, in the case of a hyperfrequency antenna, by a dielectric sheet, whose thickness is close to 80 µm.

According to the invention, to manufacture a layer of polymerized plastic 6 of the card body 3, it is extended on a manufacturing support of the

ES 2 138 807 T3 card 1, a mixture comprising at least one monomer, which bears the number 100 in figure 2. This monomer 100 is liquid and of low viscosity. In practice, the viscosity of the monomer (s) 100 is between approximately 100 and 1000 mPa.s and is preferably less than approximately 500 mPa.s, at a Trep temperature. spread of the mixture.

On the other hand, the polymerization of the monoomer (s) 100 is initiated thanks to an initiator 101. The initiator 101 can be an ionic or radical catalyst or also in an actic radiation.

In the case that the initiator 101 is a catalyst, it is present in the mixture, when it is extended and it decomposes, while the polymerization begins, into one or more decomposition products.

102 of the aforementioned initiation.

On the other hand, in the case that the initiator 101 is an actan radiation, such as UV radiation, said initiator 101 is not present, of course, in the mixture, although it induces the decomposition of an agent thereof. that forms a radical or an ioan, which initiates polymerization. As a consequence of initiation, one or more decomposition products 102 of said initiation are found again.

When the polymerization of the monomer 100 is carried out alone in the presence of an initiator 101, the polymerization time is important, greater than approximately 15 minutes. Consequently, the polymerization reaction is accelerated by adding, in the mixture comprising the initiator 101 and the monoomer 100, an accelerator

103 that cannot, by itself, initiate the polymerization reaction.

Following the invention, the amount of accelerator 103 is adjusted in order to regulate, in particular, the polymerization rate of the monomer 100. The greater the presence of the accelerator 103 in large quantities in the mixture and the more active it is, the faster It is the polymerization and the process is more profitable from an industrial point of view.

However, it is necessary to find a mean term in terms of the acceleration of polymerization. Indeed, too fast a polymerization brings with it an excessively high temperature increase, due to the exothermicity of the polymerization reaction. In practice, in the presence of an accelerator 103 in sufficient quantity, the temperature of a mixture comprising only the initiator 101 and the monoomer 100 increases rapidly until reaching values ​​of the order of 80 ° C. Now, a temperature of this order it induces, in particular, the formation of bubbles, the necessary elimination of which is delicate. It can also damage the micro-module and even the card's electroanic chip. It finally favors the contraction.

On the other hand, in the presence of an accelerator 103 only, the polymerization of the monomer 100 gives rise to a brittle product, as the polymeric chains are arranged, generally close to each other. Furthermore, the polymerization is not complete and the unpolymerized monomer 100, which is generally volatile, slowly expands in the atmosphere and gives off a foul odor.

Because of this, according to the invention, to the spread mixture containing the monomer 100, the initiator 101 and the accelerator 103, a simple intercalary compound 104, an intercalary elastomer 105, and a polymer 106 are added. However, they can be introduced other compounds in the mixture and in particular, a mineral filler that allows, for example, to regulate the whiteness of the polymerized layer obtained. In one example, the mineral filler is a calcium carbonate filler.

The simple intercalary compound 104 is a monomer compatible with monomer 100 but which carries a chemical radical R intended to move adjacent polymeric chains away, up to a sufficient distance, to give the polymerized layer an elasticity and flexibility greater than that which would have been obtained. with the monomer 100 only.

The elastomeric intercalary compound 105 is a difunctional polymer that has the property of intercalating within and between two adjacent polymeric chains, with a view to crosslinking the polymerized layer. The elastoamer segment of compound 105 makes it possible in particular to fully regulate the flexibility of the polymerized layer, without, on the other hand, increasing its brittleness.

The intercalar compounds 104 and 105 also cause a sufficient distance from the adjacent polymeric chains so that the polymerization of the monoamers 100 is complete, the nauseating odor being then suppressed.

Polymer 106 is compatible with polymer 100, that is, it can be mixed with it. This occurs in particular when said polymer 106 is a homopolymer of monomer 100. This also occurs when polymer 106 is a polymer, homopolymer or heteropolymer, which dissolves in monomer 100. Furthermore, polymer 106 can come from rapid polymerization of a monoomer other than monomer 100. Thanks to these monomers, the viscosity, at the time of spreading, can be kept at a very low level.

Polymerization reactions have a limit above which they are considered accelerated. It is the gel effect (or Trommsdorff effect) that is observed in acrylic and methacrylic monoamers. In practice, this limit varies between 2 and 20% polymerization of the monoomer (s) present in the mixture. Consequently, if a polymer / (polymer + monoomer) ratio of the extended mixture is advantageously adjusted as a function of the 100, 104, 105 monoomer (s) present, their viscosity, their reactivity, all with a proportion of initiator 101 and accelerator 103 determined, so that said ratio is comprised between 2/100 and 20/100 or more, the polymerization will be accelerated in advance.

The fact of choosing a polymer / (monoomer + polymer) ratio higher than the threshold of the gel effect has advantages. This makes it possible, on the one hand, to further reduce the overall polymerization time of the monoamers 100, 105, 105. On the other hand, it makes it possible to limit the amount of total heat released by the exothermic polymerization reaction, as part of the polymerization is already polymerized. the components of the mixture. This allows

ES 2 138 807 T3 also limit the shrinkage of the polymerized material on the manufacturing support of the card and around the micromodule and, finally, provide, if necessary, if the polymer is not a homopolymer of the monomer and if said polymer is more flexible than the mentioned homopolymer of the monomer, a greater flexibility and a plasticizing effect to the polymerized layer obtained.

However, choosing a polymer / (monoomer + polymer) ratio higher than the threshold of the gel effect has a major drawback: The viscosity of the mixture is increased. The distribution of the spread material on the card manufacturing support is then carried out with more difficulty, and requires in particular a spread of the mixture with a stronger pressure. It was observed that this partitioning constitutes a critical problem in the manufacturing of chip cards, where the cavities of the molds have a very shallow depth that does not facilitate the flow of fluids.

A middle ground must therefore be found as regards the viscosity of the spread mixture.

This average term is very different, in particular, according to the type of card manufactured or even according to the procedure used for the manufacture of cards of a particular type.

In the case of manufacturing contactless cards by injection, the injection pressure is advantageously low, taking into account the fragility of the antenna. Consequently, the viscosity of the spread material is carefully chosen so as to be low enough not to damage the antenna and strong enough to induce, if necessary, a gel effect.

Likewise, in the case of the manufacture of contactless type cards by simple dispensing following, for example, the procedure described in the French patent application filed on September 13, 1994 with the number FR-A-272447, which proposes a distribution of the material dispensed along the antenna by means of a guide, the ratio of polymer / (monomer + polymer) is chosen so that it approaches the acceleration limit of polymerization by gel effect, the chosen viscosity thus being the lowest possible.

On the other hand, in the case of manufacturing cards with injection contacts, the injection pressure can be important since there is no antenna and the viscosity of the spread mixture is advantageously higher than the aforementioned viscosities.

In one embodiment of the process of the invention, represented in FIG. 3, the monomer 100, the initiator 101, the accelerator 103, the simple intercalary compound 104, the elastomeric intercalary compound 105 and the polyomer 106 are conserved in two deposits of storage 13 and 14 under conservation conditions such that said monomer 100 is substantially stable over time, that is, under conditions such that the polymerization of the mentioned polymer 100 is not carried out significantly.

Naturally, the number of deposits is not limited to two. You can have for example 6 different deposits, each with a compound

100, 101, 103, 104, 105 or 106.

Each reservoir 13 or 14 may contain a solution comprising one or more of the following compounds: monoomer 100, initiator 101, accelerator 103, simple intercalary 104, elastomeric intercalary 105, and polymer

106. However, a reservoir 13, 14 cannot contain at the same time the monomer 100, the accelerator 103, and the initiator 101. On the other hand, the initiator 101 is preferably introduced into the less reactive monoomeric solution. Finally, the deposits advantageously comprise both the monomer 100 and the polymer 106 so that the viscosity of the two solutions are close.

Therefore, in the example of Figure 3, reservoir 13 comprises a solution S1 with compounds 100, 101, 104, 105 and 106, while reservoir 14 comprises a solution S2 with compounds 100, 103, 104, 105 and 106.

The tanks 13 and 14 are connected to a mixing head 15 by means of conduits that carry respectively the numbers 16 and 17. The flow rate of the mixture M1 in the conduit 16 is regulated by a gate 18, while the flow rate of the mixture M2 in duct 17 it is regulated by a gate 19. The mixing of the solutions S1 and S2 and consequently of the initiator 101 and the accelerator 103 is carried out in the mixing head 15 following a ratio S1 / S2 controlled by the gates 18 and 19. This mixture has a temperature Tmel. In one example, Tmel reaches 25^°C.

Taking into account the fact that the final mixture, which comprises both the initiator 101 and the accelerator 103, reacts quickly and that the polymerized layer obtained can be thermosetting (cross-linked) and not soluble, a mixing head 15 is advantageously used. high pressure, self-cleaning. However, in the case that the polymerized layer obtained is thermoplastic (not cross-linked) and soluble, it is possible to use a low pressure mixing head.

In the embodiment presented in figure 3, the spreading is a simple dispensing of the mixture from the mixing head 15, which is carried through a conduit 20 on a manufacturing support 21 of the cards 1. This support is formed then through an open cavity of a half-mold 23, called a crown, arranged on a film 24 destined to form a lower layer of the card body 3. The spreading is carried out at a reduced pressure, of the order of atmospheric pressure.

However, in other embodiments, the manufacturing support 21 was formed by a honeycombed frame, such as that described in the French patent application filed on February 24, 1994 with number 94 02130 and in other embodiments, the Spreading is an injection under pressure into a closed cavity of a mold with the format of the card or layer to be obtained.

Of course, the micromodule 2 and, where appropriate, the antenna 12, may be present when spreading on the manufacturing support.

twenty-one. However, they can be inserted into the spread mixture, when the polymerization of said

ES 2 138 807 T3 mixing is not sufficient for its viscosity to reach too high values, higher than approximately 10,000 mPa.s.

A lamination of the spread mixture can be carried out, for example, between two rollers in order to quickly obtain predetermined thicknesses of the card body. Furthermore, a lamination of this type is only conceived with viscosities and polymerization rates that are particularly adapted and compatible, in particular, with an extension without shedding, after said lamination, on a lower film and with the coating of a set "lower film - laminated blend ", with a second film intended to form a top layer of the card body.

On the other hand, a lamination can be carried out after a spreading step in an open cavity of a crown mold and, after having applied an upper film intended to form an upper layer of the card body, after demoulding and trimming of the lower films. and higher. It will be observed that, in this case, the applied films adhere naturally to the scattered mixtures, since the polymerization of the mentioned materials has not completely finished, in the application stage of the mentioned films.

On the other hand, an initiation by radiation can be carried out, once the mixture has been spread, for example by opening a cavity of the manufacturing support 21 of a card. It was observed if the mixture of the monomer 100, the initiator 101, the accelerator 103, the compounds 104, 105 and the polymer 106 is produced directly on the manufacturing support of the card 1, the mixing, spreading and activation stages The aforementioned of the procedure of the invention are then confused.

According to the invention, the sets of gates 18, 19 allow, by varying their openings, to easily choose a middle term among all the conditions mentioned in order to obtain a satisfactory product. From this point of view, the solution of the invention is much better than the old solutions mentioned. Indeed, with these, before each new shape or before each new conditioner, before the appearance of the surface to be modified for example, it was necessary to carry out numerous laborious tests again, to build numerous molds before selecting a suitable process and mold. Thanks to the possibilities of regulation of the procedure according to the invention, good intermediate solutions are quickly obtained by means of simple steps of adjustment of the relationship. These intermediate solutions have made it possible to fine-tune card manufacturing processes, in which thermosetting materials polymerize at temperatures below approximately 70 ° C and on the order of approximately 50 ° C, while the viscosity of the spread materials is below 10,000 mPa. s, or even 5,000 mPa.s.

For the implementation of the invention, a mixture based on an acrylic or methacrylic monoomer is advantageously used. In particular, the following monoomers can be used:

- Methyl methacrylate (MMA),

- Ethyl triglycol methacrylate (ETMA),

- 2-hydroxyethyl methacrylate (HEMA),

- Methacrylic acid ester (C13-MA),

- Isobornyl methacrylate (IBOMA),

- Isobornyl acrylate (IBA),

- Dicyclopentenyloxyethyl methacrylate (DPOMA)

- Tetrahydrofurfuryl methacrylate (THFMA),

- n-butyl methacrylate (BMA),

- Benzyl methacrylate (BNMA),

- 2, dimethylaminoethyl methacrylate (DMAEMA),

- 1,4-butanediol dimethacrylate (BDDMA),

- Diethylene glycol dimethacrylate (TEGDMA),

- Diurethane dimethacrylate (TMDI),

- 1.12 dodecandiol dimethacrylate (DDDMA) ^Y

- Trimethiiolpropantrimethacrylate (TMPTMA).

We now consider the example of methyl methacrylate (MMA). Polymethylmethacrylate (PMMA), obtained by polymerization of MMA, is particularly suitable for coating inserts.

However, it is known that the polymerization of MMA is highly exotothermic and that it presents an important retraction that requires, in the field of card manufacturing, the selection of good intermediate solutions, through precise regulations, according to the type of card and the procedure. chosen.

In the presence of a simple radical initiator, such as a peroxide, or an ultraviolet radiation, the MMA polymerizes and PMMA is then obtained. However, this polymerization is slow. For example, it is on the order of 45 minutes in the presence of benzoyl peroxide.

For this reason, the polymerization of MMA is accelerated by a tertiary amine such as N, N-bis (2-hydroxyethyl) -p-toluidine). Thanks to this amine, the polymerization time is considerably reduced. It is on the order of 15 minutes. However, the product obtained is brittle, has a significant number of bubbles, and emits a foul odor.

Consequently, by using triethylene glycol monomethyl methacrylate (TEGMA) or HEMA as a simple intercalary compound and polybutadiene dimethacrolic (PBDMA) as an elaostomeric intercalary compound, the flexibility of the polymeric layer or the obtained card is regulated and the release of bad odors is avoided. .

In addition, adding to the PMMA mixture, a polymer compatible with MMA, or a monomer whose polymerization is extremely rapid, such as, for example, a cyanoacrylic, is achieved immediately or rapidly, when performing the

ES 2 138 807 T3 mixture, a polymer (monomer + polymer) ratio of the order of 20% and the polymerization time is then reduced due to the gel effect. In practice, this global polymerization time reached is of the order of 6 minutes.

On the other hand, a titanium dioxide (TiO2) filler is advantageously introduced into the mixture with a view to whitening the polymerized layer obtained.

The following examples are given for illustrative purposes and are not intended to limit the invention in any way.

In a first example relating, in particular, to the manufacture of contactless cards by simple dispensing into an open cavity, solutions S1 and S2, stored at room temperature in tanks 13 and 14, have the following composition, giving the percentages in weight:

<td colspan="2">S1:</td>

<td>MMA (100)</td><td> 53,3%</td>

<td>Amine (103)</td><td> 4,6%</td>

<td>PMMA (106)</td><td> 33,3%</td>

<td>TiO2</td><td> 8,6%</td>

<td colspan="2">S2:</td>

<td>MMA (100)</td><td> 41,5%</td>

<td>Peroxide (101)</td><td> 7,7%</td>

<td>PBDM (105)</td><td> 41,5%</td>

<td>TiO2</td><td> 9,2%</td>

If mixing is done, with Tmel. equal to room temperature, of 10.5 g of S1 with 6.5 g of S2, a mixture M is obtained whose composition is as follows, where the percentages are indicated by weight:

<td colspan="2">M:</td>

<td>MMA (100)</td><td> 48,8%</td>

<td>Peroxide (102)</td><td> 2,9%</td>

<td>Amine (103)</td><td> 2,9%</td>

<td>PBDM (105)</td><td> 15,9%</td>

<td>PMMA (106)</td><td> 20,6%</td>

<td>TiO2</td><td> 8,8%</td>

The polymerization of this mixture takes place in less than 6 minutes at a temperature below

50 ° C.

At this temperature, as well as at higher temperatures, MMA is liquid and its viscosity is less than approximately 100 mPa.s. The viscosity of this monomer is therefore much lower than the viscosities of thermoplastic materials used in prior art card manufacturing processes, which exceed 10,000 mPa.s.

The amounts of MMA, PMM, amine and peroxide are, of course, adjusted in the solutions S1 and S2 and in the mixture M, thanks to the gates 18 and 19. In this way, thanks to the aforementioned constituents combined together in adjustable proportions, by simple means to obtain a quick set-up of a mold and an ooptimal, industrially acceptable process. Yes Tmel. Y

Trep. are of the order of room temperature, the maximum temperature obtained in the polymerization increases, under such conditions, up to 45^°C approximately, while the viscosity of the mixture is, at Trep., Of the order of 1,000 mPa.s.

In a second example, the gel effect is caused by initiating the very rapid polymerization of cyanoacrylate monoomers (CNA) by an anonic means, thanks to the intervention of a basic catalyst: an amine. At the time of mixing, the PMMA / (CNA + MMA + PMMA) ratio is not sufficient to initiate the gel effect. However, the amine initiates a rapid, even instantaneous, polymerization of CNA into polycyanoacrylate (PCNA). Consequently, the ratio (PMMA + PCNA) / (MMA + PMMA + PCNA) becomes sufficient to generate a gel effect in the mixture and accelerate the polymerization of MMA activated by the peroxide / amine combination. Solutions S1 and S2, stored at room temperature in tanks 13 and 14, have the following composition, giving the percentages by weight:

<td colspan="2">S1:</td>

<td>- MMA (100)</td><td> 48,4%</td>

<td>- Peroxide (101)</td><td> 3,2%</td>

<td>- CNA (106)</td><td> 16,1%</td>

<td>- PMMA (106)</td><td> 32,3%</td>

<td colspan="2">S2:</td>

<td>- MMA (100)</td><td> 57,7%</td>

<td>- Amine (103)</td><td> 3,8%</td>

<td>- PMMA (106)</td><td> 38,5%</td>

If done, to Tmel. equal to room temperature, the mixture of 10.3 g of S1 with 8.7 g of S2, then a mixture M is obtained, the composition of which is as follows, giving the percentages by weight:

<td colspan="2">M:</td>

<td>- MMA (100)</td><td> 52,7%</td>

<td>- Peroxide (102)</td><td> 1,75%</td>

<td>- Amine (103)</td><td> 1,75%</td>

<td>- PCNA (106)</td><td> 8,7%</td>

<td>- PMMA (106)</td><td> 35,1%</td>

The polymerization of this mixture is then carried out in less than 5 minutes at a temperature of the order of 55^°C, and increasing 10^°C with respect to the aforementioned temperature of 45^°It is mainly due to the polymerization of CNA.

In a third example, HEMA has been introduced into the mix.

The solutions S1 and S2, stored at room temperature in tanks 13 and 14 then have the following composition, expressing the percentages by weight:

ES 2 138 807 T3

<td colspan="2">S1:</td>

<td>- MMA (100)</td><td> 15,8%</td>

<td>- Peroxide (101)</td><td> 3,5%</td>

<td>- HEMA (104)</td><td> 60,7%</td>

<td>- PBDM (105)</td><td> 20%</td>

<td colspan="2">S2:</td>

<td>- MMA (100)</td><td> 20%</td>

<td>- Amine (103)</td><td> 1,9%</td>

<td>- HEMA (104)</td><td> 61,9%</td>

<td>- PBDM (105)</td><td> 16,1%</td>

If done, to Tmel. equal to room temperature, the mixture of 10 g of S1 with 10 g of S2, then a mixture M is obtained, the composition of which is as follows, giving the percentages by weight:

<td colspan="2">M:</td>

<td>- MMA (100)</td><td> 20%</td>

<td>- Peroxide (102)</td><td> 1,75%</td>

<td>- Amine (103)</td><td> 0,95%</td>

<td>- HEMA (104)</td><td> 61,3%</td>

<td>- PBDM (105)</td><td> 16,0%</td>

HEMA is ultimately an elastomeric intercalary compound. Consequently, the polymerization of the MMA will be complete and no bad odors are given off.

In a fourth example, MMA has been removed. The solutions S1 and S2, stored at room temperature, then have the following composition, expressing the percentages by weight:

<td colspan="2">S1:</td>

<td>- HEMA (100)</td><td> 76%</td>

<td>- Peroxide (101)</td><td> 4%</td>

<td>- PBDM (105)</td><td> 20%</td>

<td colspan="2">S2:</td>

<td>- HEMA (100)</td><td> 77,4%</td>

<td>- Amine (103)</td><td> 2,4%</td>

<td>- PBDM (105)</td><td> 20,2%</td>

If done, to Tmel. equal to room temperature, the mixture of 10 g of S1 with 10 g of S2, then a mixture M is obtained, the composition of which is as follows, giving the percentages by weight:

<td colspan="2">M:</td>

<td>- HEMA (100)</td><td> 76,7%</td>

<td>- Peroxide (101)</td><td> 2%</td>

<td>- Amine (103)</td><td> 1,20%</td>

<td>- PBDM (105)</td><td> 20,1%</td>

However, the adherence of the aforementioned mixture is low.

The solutions selected thanks to the simple regulations of factors such as viscosity and speed or overall polymerization time allow to quickly select the appropriate procedure for the manufacture of the cards as well as the mold used.

The cards obtained by the method according to the invention using the acrylic or methacrylic system are, regardless of whether they have contacts or not, flexible, hard, shock resistant and have a good surface condition. The weight of the monomer or modifying polymers, such as, for example, acrylate or butyl methacrylate, make it possible to regulate the aforementioned properties of the cards.

Naturally, various thermosetting monomer / polymer reactive systems can be applied that allow a rapid synthesis of polymerized compounds by means of an activated chain elongation reaction, according to the procedure of the invention and, in particular, acroilic or methacrylic systems other than the system. MMA / PMMA, from β-epoxide systems that polymerize, for example, cationically, or polyurethane systems that polymerize, for example, heating them to temperatures above a limit reaction temperature.

The 100 monoomers are chosen for their characteristics and their impact on the polymerized layer 6. MMA is chosen for adherence and rigidity, THFMA is chosen for adherence, IBOMA is chosen for its resistance to temperature and TMPTMA for the rigidity. With a mixture of 100 monoomers, an intermediate solution is thus obtained in terms of adhesion, rigidity and resistance to temperature of layer 6.