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WO2009090057A1 - Matériau polymère marquable au laser et son procédé de fabrication - Google Patents

Matériau polymère marquable au laser et son procédé de fabrication Download PDF

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Publication number
WO2009090057A1
WO2009090057A1 PCT/EP2009/000193 EP2009000193W WO2009090057A1 WO 2009090057 A1 WO2009090057 A1 WO 2009090057A1 EP 2009000193 W EP2009000193 W EP 2009000193W WO 2009090057 A1 WO2009090057 A1 WO 2009090057A1
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WO
WIPO (PCT)
Prior art keywords
polymer
sensitive
laser
sensitive polymer
mixture
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.)
Ceased
Application number
PCT/EP2009/000193
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German (de)
English (en)
Inventor
Hans-Gerhard Fritz
Stephan Widmayer
Thadeus Schauer
Heinz Greisiger
Paul Ludwig Englert
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.)
GABRIEL - CHEMIE DEUTSCHLAND GmbH
Ikt Institut fur Kunststofftechnik
Forschungsinstitut fur Pigmente und Lacke eV
Original Assignee
GABRIEL - CHEMIE DEUTSCHLAND GmbH
Ikt Institut fur Kunststofftechnik
Forschungsinstitut fur Pigmente und Lacke eV
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Application filed by GABRIEL - CHEMIE DEUTSCHLAND GmbH, Ikt Institut fur Kunststofftechnik, Forschungsinstitut fur Pigmente und Lacke eV filed Critical GABRIEL - CHEMIE DEUTSCHLAND GmbH
Publication of WO2009090057A1 publication Critical patent/WO2009090057A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2481/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
    • C08L81/02—Polythioethers; Polythioether-ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
    • C08L81/04—Polysulfides

Definitions

  • the present invention relates to a method for producing a laser-markable polymer material and to the laser-markable polymer material itself.
  • Laser-markable polymer materials are used to make many different products. By irradiation of such a polymer material with laser light can be generated quickly and easily a label, with a touch of the polymer material or a treatment with chemicals are not necessary. The resulting marking is usually durable and resistant to abrasion. In this way, methods for laser marking have clear advantages over conventional methods for marking production goods such as printing, embossing, stamping or labeling.
  • the irradiation may cause an optically perceptible modification of the surface structure of the polymeric material, for example by ablation, fusing, hardening or foaming.
  • Other methods take advantage of the fact that some polymer materials can be carbonized by laser light, assuming a dark to black color.
  • Laser-markable polymer materials are known in which a polymer material which can only be marked with difficulty by irradiation with laser light is admixed with an additive which is well suited for absorbing laser beam energy.
  • additives for example, materials such as carbon black or graphite can be used, which deliver the energy absorbed by them to the difficult laser-markable polymer material, so that in this one Carbonation can be initiated.
  • intrinsically laser-markable additives for example pigments or dyes, which themselves show a color change under the influence of laser light.
  • intrinsically laser-markable polymer materials as additives in a matrix consisting of a laser-markable polymer material is also known.
  • the intrinsically laser-markable polymer is usually present in the form of particles distributed in the matrix, the size of the particles having a decisive influence on the quality of a marking that can be applied to the polymer material, in particular on the contrast between marking and background and on the edge sharpness of the polymer Mark, has.
  • one or more intrinsically laser-markable polymers in the form of micronized particles are provided which already have a particle size which is advantageous for laser light marking.
  • the particles are mixed with a hard-to-plasticizable plastic material and then incorporated into the hard-plastic material while melting it. A melting of the particles should be prevented in order to avoid a change in their structure during the incorporation process.
  • a disadvantage of this method is that the micro-milling of polymers is very energy-consuming and expensive. In addition, when grinding by the occurrence of Reagglomerationsvor réellen the achievement of the desired particle size can be difficult.
  • WO 2004/050766 describes a method for producing a laser light-absorbing additive, in which initially a starting mixture of a carbonizable first, a second and optionally a third polymer is provided. When melting the starting mixture rea- g. functional groups of the first polymer having functional groups of the second polymer to form covalent bonds between the first polymer and the second polymer. Particles of the first polymer are generated by this process, wherein on the surface of the particles, the first polymer is covalently bonded to the second polymer.
  • a laser-markable polymer composition can be obtained by mixing the additive thus obtained with a molten matrix polymer.
  • WO 2004/050767 also describes a process for producing a laser light-absorbing additive in which the formation of covalent bonds between a carbonizable polymer and a further polymer enables the formation of particles of the carbonizable polymer.
  • the starting mixture When compiling the starting mixture for the production of an additive according to WO 2004/050766 or WO 2004/050767 strict conditions must be maintained with respect to the proportions of the polymers used in the starting mixture, their viscosities and the respective number of functional groups of the polymers reacting with each other, thus particles of the carbonizable polymer, in particular particles of a size suitable for laser light marking. In these processes, therefore, it is difficult to determine useful combinations of polymers and to properly determine the proportions of polymers in the starting mixture. In general, the starting mixture must have a relatively high proportion of a third polymer in which the resulting particles can be distributed in the melt.
  • the object of the present invention is to provide a method for producing a laser-markable polymer material, in which the aforementioned disadvantages of the methods known from the prior art are avoided.
  • This object is achieved in the method of the aforementioned type according to the invention in that the method comprises the following steps:
  • diluent mixture comprising the masterbatch material and a difficultly laser-markable diluent polymer compatible with the base polymer in a given mixing ratio, wherein the diluent polymer is selected so that a melting temperature of the diluent polymer is below the melting temperature of the sensitive polymer; and d) processing the dilution mixture to melt the base polymer and the diluent polymer for a predetermined time at a second temperature below the melting temperature of the sensitive polymer to obtain a laser-markable polymeric material.
  • a masterbatch material is firstly prepared by a process of dispersing the sensitive polymer in the base polymer in a simple manner, which comprises particles of the sensitive polymer having a size advantageous for laser marking in a high concentration.
  • an isomerizable polymer material is prepared from the masterbatch material by dilution with the diluent polymer, in which the particles are present in a lower concentration, which is advantageous for the application of laser markings.
  • the particle size in the polymer material remains substantially unchanged from that obtained in the masterbatch material.
  • dilution of a given masterbatch material with a variety of diluent polymers can be carried out to give numerous possible variations in the composition of the polymer materials obtainable by the process.
  • the selection of the components of the starting mixture and the determination of their proportions of the starting mixture is carried out so that the sensitive polymer is dispersible in the base polymer with co-melting.
  • Whether dispersibility of the sensitive polymer in the base polymer is given for a given starting mixture can be checked by a simple calculation.
  • the ratio of the viscosities ⁇ , of the polymers at the first temperature at which the dispersion is to be carried out (their viscosity ratio ⁇ i) and the ratio of their volume concentrations O 1 (their volume concentration ratio ⁇ 3 ) must be determined.
  • the volume concentration ⁇ , a component of a mixture is defined as the quotient of the volume of the component and the total volume of the mixture.
  • volume concentration ratio ⁇ 3 is given by the formula II:
  • a 3 ⁇ sensitive polymer ⁇ ⁇ base polymer (H)
  • Dispersibility of the sensitive polymer in the base polymer is given when the following conditions are met:
  • the base polymer and the sensitive polymer are free of functional groups which react to form a covalent bond between the sensitive polymer and the base polymer in the preparation of the masterbatch material.
  • the dispersion process is thus not influenced by such reactions. It is not necessary, when selecting the components of the starting mixture and determining their proportions of the starting mixture, to ensure that functional groups of the sensitive polymer and of the base polymer are each present in a number which enables the formation of particles.
  • the selection of suitable compositions of the starting mixture can therefore be made in a simple manner.
  • the inventive method can be carried out without the addition of further polymer material in addition to the sensitive polymer and the base polymer to the starting mixture.
  • further polymer material which may also be composed of several different polymers.
  • the other polymer material should be free of functional groups which react when melting the sensitive polymer and the base polymer to form a covalent bond with functional groups of the sensitive polymer. This ensures that bond-knotting reactions between the further polymer material and the sensitive polymer do not influence the dispersion process. Occurrence of such reactions could result in particles of the sensitive polymer not being obtained only with a size poorly suited for laser light marking.
  • the particles of the sensitive polymer in the masterbatch material, while adhering to the conditions described for the composition of the starting mixture generally have a size of 0.1 ⁇ m to 4 ⁇ m which is advantageous for laser light marking.
  • This advantageous particle size should be preserved in the production of the laser-markable polymer material from the masterbatch material.
  • the base polymer and the sensitive polymer are already selected in the preparation of the starting mixture so that a melting temperature of the base polymer is below a melting temperature of the sensitive polymer.
  • the preparation of the masterbatch material is carried out with co-melting of the base polymer and the sensitive polymer
  • the dilution is made while melting the base polymer and the diluent polymer but below the melting temperature of the sensitive polymer. This avoids re-melting of the particles of the sensitive polymer and their structure and size are not significantly altered during the dilution process. Therefore, they also have in the laser-markable polymer material the size advantageous for the markability, with which they have been prepared in the dispersion process.
  • a diluent polymer which is compatible with the base polymer is used, so that a good miscibility of the base polymer and the diluent polymer is achieved and the most homogeneous possible distribution of the particles of the sensitive polymer in the laser-markable polymer material can be achieved.
  • the melting temperature of the sensitive polymer is 10 K or more above the melting temperature of the base polymer. Then, the dilution can be carried out at a second temperature lying between these melting temperatures, in which both a substantial melting of the base polymer and a high stability of the particles of the sensitive polymer are ensured. More preferably, the melting temperature of the sensitive polymer is 20 K or more above the melting temperature of the base polymer.
  • the melting temperature of the sensitive polymer is 10 K or more above the melting temperature of the diluent polymer. This allows a simple selection and control of a second temperature, in which a substantial melting of the diluent polymer and at the same time a high stability of the particles of the sensitive polymer are given.
  • the mixture of the base polymer and the diluent polymer made during the dilution is favored by the most complete possible melting of these two polymers.
  • the compatibility of the diluent polymer with the base polymer is ensured by using similar polymeric materials as the base polymer and diluent polymer.
  • identical materials can also be used for the base polymer and the diluent polymer.
  • the proportion of the masterbatch material in the dilution mixture is selected such that the proportion of the sensitive polymer in the dilution mixture is 20% by mass or less.
  • the polymer material obtained in the dilution has a content of sensitive polymer, which allows high quality markings by laser light.
  • the proportion of the sensitive polymer in the dilution mixture is preferably 5% by mass or less, more preferably 0.1% by mass to 3% by mass.
  • a polymer material comprising polyphenylene sul fide (PPS) is used as the sensitive polymer.
  • PPS polyphenylene sul fide
  • PPS is excellent for absorbing laser beam energy. It is furthermore free of functional groups which have a high reactivity under the conditions of dispersion.
  • a polymer material comprising PPS it is therefore possible to use a multiplicity of polymer materials as base polymer or as further polymer material, without it being possible for formation of covalent bonds between this polymer material and the PPS to influence the dispersion process.
  • PPS has such a high melting point that it is easily possible to select a base polymer and a diluent polymer whose melting temperatures are below this value, so that the dilution step can be carried out without melting the PPS.
  • a polymeric material comprising a polyamide is preferably used as the base polymer.
  • Polyamides are usually difficult to laser mark. The dispersion of PPS in a polyamide proceeds without the formation of covalent bonds between the polyamide and PPS.
  • polyamides have significantly lower melting temperatures than PPS (eg, about 220 0 C for PA6), so that the second temperature in the dilution of a polyamide and PPS comprehensive masterbatch material within a relatively wide Temperature range may vary without an insufficient melting of the polyamide or a partial melting of the PPS occurs.
  • the first temperature is preferably selected to be 285 ° C. or more.
  • the preparation of the masterbatch material is carried out at the melting temperature of PPS or a higher temperature and it is ensured that both the PPS and the base polymer are melted, as is necessary for the dispersion.
  • the first temperature is chosen to be 300 ° C. or more.
  • the second temperature is preferably chosen so that it is above the melting temperature of the base polymer and below 270 0 C when using a polymeric material comprising PPS as a sensitive polymer. This ensures, on the one hand, that melting of the base polymer takes place during the production of the polymer material from the masterbatch material, and, on the other hand, it is carried out at a sufficiently low temperature to melt the PPS-comprising polymer material whose melting temperature is markedly higher during the dilution. to avoid.
  • the filler particles are preferably selected from pigments, in particular effect pigments and / or conductive pigments.
  • pigments in particular effect pigments and / or conductive pigments.
  • the use of such pigments can alter the change caused by the irradiation with laser light in the appearance of the polymer material advantageous reinforce.
  • Particular preference is given to using antimony-doped tin oxide as the pigment.
  • a good laser-markable polymer material can be obtained, in particular, by selecting the proportion of the filler particles in the starting mixture and / or the dilution mixture such that the mass ratio between the filler particles and the sensitive polymer in the dilution mixture is 0.001% to 90%.
  • the proportion of the sensitive polymer in the starting mixture and the proportion of the filler particles in the starting mixture and / or the dilution mixture are selected such that the combined proportion of the sensitive polymer and the filler particles in the dilution mixture is up to 10 percent by mass.
  • one or more additives may be added to the starting mixture and / or the dilution mixture.
  • the additives are selected from UV protectants, antioxidants, flame retardants, compatibilizers, fillers, dyes and / or stabilizers.
  • the addition of a dye can influence the appearance of the polymer material, which is also relevant to the quality of laser markings on the polymer material.
  • step b) is carried out in an extruder, more preferably in a co-rotating twin-screw extruder.
  • step d) is carried out in an extruder.
  • the polymer material obtained by the extrusion process has a very homogeneous distribution of the particles of the sensitive polymer in the base polymer and the diluent polymer, as it is advantageous for the markability of the polymer material.
  • step d) is carried out in an injection molding machine.
  • a homogeneous distribution of the particles of the sensitive polymer is also ensured in a production of the polymer material in a Schneckenkolbenplastiesaggregat the injection molding machine.
  • the temperature conditions given in an extruder or an injection molding machine are very easy to control, which facilitates the adjustment of the second temperature during the dilution step.
  • the laser-markable polymer material can also be subjected to a wide variety of shaping processes directly during its production. As a result, the further processing is made easier to the production in which the polymer material is to find application.
  • the present invention further relates to a masterbatch material obtainable according to steps a) and b) of the method described above. It has particles of the sensitive polymer having a size advantageous for laser light marking in the base polymer in a high concentration and can be further processed with a multiplicity of dilution polymers to give a laser-markable polymer material.
  • the subject matter of the present invention also extends to an laser-markable polymeric material obtainable by dilution of the masterbatch material according to the method described above.
  • the concentration of the particles of the sensitive polymer is lower in the polymer material than in the masterbatch material and is in an advantageous range for the application of markers.
  • the polymer material according to the invention is laser-markable, in particular with a high contrast and high edge sharpness, if it comprises particles of the sensitive polymer having a particle size of 0.1 ⁇ m to 4 ⁇ m dispersed in the base polymer and the diluent polymer. It is particularly advantageous if the particle size is 0.2 ⁇ m to 2 ⁇ m. When carrying out the process according to the invention, particle sizes in these ranges are generally achieved by the dispersion.
  • Fig. 1 obtained by means of energy dispersive X-ray spectroscopy (EDX)
  • FIG. 2 shows a photograph of a laser-marked pattern plate made of a first polymer material according to the invention
  • Fig. 3 photograph of a laser-marked pattern plate of a second inventive polymer material.
  • a starting mixture was prepared by mixing polyamide 6 (Ultramid B3, manufacturer: BASF AG) as a difficultly laser-markable base polymer and polyphenylene sulfide (Fortron 0205, manufacturer: Ticona GmbH) as an intrinsically laser-markable sensitive polymer in a mass ratio of 60:40, wherein polyamide 6 and polyphenylene sulfide were each used in the form of granules.
  • polyamide 6 Ultramid B3, manufacturer: BASF AG
  • polyphenylene sulfide Formtron 0205, manufacturer: Ticona GmbH
  • antimony-doped tin oxide is desired in the polymer material to be produced later, it can be incorporated into the masterbatch material in appropriate amounts.
  • the viscosity ratio .lambda..sub.i of polyphenylene sulfide (PPS) and polyamide 6 (PA 6) is at 300 0 C
  • volume concentration ratio ⁇ 3 of the polymers in the given starting mixture results from the mass ratio of the polymers and their densities p as follows:
  • PPS and PA6 are free of functional groups which could react with each other while co-melting the polymers to form a covalent bond between PPS and the polyamide. An influence of the dispersion process by such chemical reactions can thus be excluded.
  • the melting temperature of PA6 (about 220 0 C) is far below the melting temperature of PPS (about 285 0 C). This provides the prerequisites for diluting the masterbatch material without melting the PPS.
  • the starting mixture was processed in a co-rotating, closely meshing twin-screw extruder (type ZSK 25, L / D ratio 40, manufacturer: Coperion Werner & Pfleiderer) at a first temperature of 300 0 C to a masterbatch material.
  • the discharge of the masterbatch material was carried out through a one-hole round die with a diameter of 3 mm.
  • the resulting round strand was cooled in a water bath and subsequently cut into cylindrical granules.
  • a sample of the masterbatch material was immersed in a solvent (1,1,3,3,3,3-hexafluoro-2-propanol). worn in which PA6 is soluble. After dissolution of the PA6, the size of the undissolved remaining PPS particles was examined by means of dynamic laser light scattering (DLLS). The mean particle diameter d 50 of the particles was 1.55 ⁇ m. This gave an advantageous particle size for the laser-markability of a polymer material producible from the masterbatch material.
  • DLLS dynamic laser light scattering
  • a dilution mixture of the masterbatch material according to Example 1 and further PA6 as dilution polymer was provided, the proportion of the masterbatch material being selected so that the proportion of the sensitive polymer in the dilution mixture was 2% by mass.
  • the processing of the dilution mixture was carried out in an injection molding machine (Allrounder 220M, manufacturer: Arburg, equipped with a mixing screw instead of the conventional three-zone screw). In this case, a second temperature of 250 0 C was maintained, which is below the melting temperature of the PPS and above the melting temperature of the PA6.
  • the obtained first polymer material according to the invention was injection-molded in the form of sample plates.
  • the EDX image of the first inventive polymer material shown in FIG. 1 shows that the PPS particles present in the polymer material in a lower concentration than in the masterbatch material are homogeneously distributed in an advantageous manner for laser marking. 3.
  • a second polymer material according to the invention was produced in the same way as the first polymer material according to the invention in Example 2, antimony-doped tin oxide being added as pigment to the masterbatch material.
  • the proportion of the masterbatch material was chosen such that the proportion of the sensitive polymer in the dilution mixture was 2% by mass.
  • the antimony doped tin oxide was present in a proportion of 0.1 mass percent in the polymer material.
  • the second polymer material according to the invention was also injection-molded in the form of sample plates.
  • Sample plates made of the polymer materials according to the invention were marked with a laser of the type FOBA LAS 85 (Modemblende 1.5 - 5.0, lamp current 10 A - 32 A, frequency 1 kHz - 30 kHz, feed rate 50 mm / s - 3000 mm / s) ,
  • FIG. 2 shows the result of a laser marking of a comparative sample in which the polymer material PA6 is provided only with a content of 0.1 percent by mass of antimony-doped tin oxide.
  • the contrast of the writing lines with respect to the surrounding polymer material remains weak even at the highest laser energy per unit area used.
  • the laser markings on a pattern plate of the second polymer material according to the invention are characterized by an even higher quality. They have a very strong contrast to the background and a high edge sharpness. This can again be seen particularly clearly on the section of the surface of the sample plate shown in FIG. 4, which is also shown in enlargement, on which a line pattern has been produced as a marking.
  • the use of antimony-doped tin oxide as pigment advantageously enhances the change in the optical impression of the polymer material which results when laser light is irradiated on the PPS particles dispersed in PA 6.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Optics & Photonics (AREA)
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Abstract

L'invention concerne un procédé de fabrication d'un matériau polymère marquable au laser, qui comprend les étapes suivantes : a) fourniture d'un mélange initial, comprenant un polymère de base difficilement marquable au laser, un polymère sensible intrinsèquement marquable au laser et optionnellement un autre matériau polymère, sachant que le polymère de base, le polymère sensible et l'autre matériau polymère sont choisis de telle sorte qu'ils sont dépourvus de groupes fonctionnels qui, lors de la fusion du polymère sensible et du polymère de base, réagissent entre eux en formant une liaison covalente entre le polymère sensible et le polymère de base, ou entre le polymère sensible et le matériau polymère ; b) transformation du mélange initial en un matériau de mélange maître par fusion du polymère de base et du polymère sensible pendant une durée prédéfinie à une première température, sachant que le polymère sensible est dispersé dans le polymère de base ; c) fourniture d'un mélange de dilution comprenant le matériau de mélange maître et un polymère de dilution difficilement marquable au laser qui est compatible avec le polymère de base ; et d) traitement du mélange de dilution par fusion du polymère de base et du polymère de dilution pendant une durée prédéfinie à une deuxième température inférieure à une température de fusion du polymère sensible, avec obtention d'un matériau polymère marquable au laser.
PCT/EP2009/000193 2008-01-15 2009-01-15 Matériau polymère marquable au laser et son procédé de fabrication Ceased WO2009090057A1 (fr)

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DE102008005862.9 2008-01-15
DE102008005862A DE102008005862A1 (de) 2008-01-15 2008-01-15 Lasermarkierbarer Polymerwerkstoff und Verfahren zu seiner Herstellung

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WO2024022990A1 (fr) 2022-07-26 2024-02-01 Merck Patent Gmbh Composition polymère pour marquage laser

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