WO2022218900A1 - Verfahren für das partielle einfärben von kunststoffteilen mittels fester farbstoffe in farbträgerschichten - Google Patents
Verfahren für das partielle einfärben von kunststoffteilen mittels fester farbstoffe in farbträgerschichten Download PDFInfo
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- WO2022218900A1 WO2022218900A1 PCT/EP2022/059577 EP2022059577W WO2022218900A1 WO 2022218900 A1 WO2022218900 A1 WO 2022218900A1 EP 2022059577 W EP2022059577 W EP 2022059577W WO 2022218900 A1 WO2022218900 A1 WO 2022218900A1
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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
- B41M5/382—Contact thermal transfer or sublimation processes
-
- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
- C08J7/065—Low-molecular-weight organic substances, e.g. absorption of additives in the surface of the article
-
- 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
-
- 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
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/38235—Contact thermal transfer or sublimation processes characterised by transferable colour-forming materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/41—Marking using electromagnetic radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/04—Direct thermal recording [DTR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/06—Printing methods or features related to printing methods; Location or type of the layers relating to melt (thermal) mass transfer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/30—Thermal donors, e.g. thermal ribbons
-
- 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
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0052—Digital printing on surfaces other than ordinary paper by thermal printing
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- 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
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0064—Digital printing on surfaces other than ordinary paper on plastics, horn, rubber, or other organic polymers
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- 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
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
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- 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
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
- B41M5/0358—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic characterised by the mechanisms or artifacts to obtain the transfer, e.g. the heating means, the pressure means or the transport means
-
- 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
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
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- 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
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/385—Contact thermal transfer or sublimation processes characterised by the transferable dyes or pigments
-
- 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
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
Definitions
- the present invention relates to a method for partial single-coloring, in particular for colored laser engraving, using an ink ribbon, of plastic parts, in particular thermoplastic parts, particularly thermoplastic parts, comprising a layer structure, the resulting partially colored, preferably colored laser-engraved, plastic parts, in particular thermoplastic parts, and the Use of such colored plastic parts in security documents.
- plastic parts in color using a laser
- plastic parts can also be engraved in color using a laser, which have a coating for their surface protection. The laser beam removes the paint layer and at the same time the dye migrates into the plastic surface at this point.
- Exposed plastic surfaces can also be color laser engraved and then painted to ensure a consistent glossy appearance of the plastic parts and to provide protection against scratches and chemical damage. So far, such colored symbols can be produced, for example, in the first production step by plastic injection molding with multiple colored components.
- the plastic parts In a second production step, the plastic parts have to be painted with an opaque color. In a third production step, the colored layer has to be engraved using a laser in order to expose the underlying plastic surface. Optionally, a protective coating can be applied in a fourth production step.
- transparent plastic foils can be engraved in color on the back and then back-injected with a thermoplastic, according to the Film Insert Molding process, in order to obtain glossy or uniform-looking surfaces. This method is disclosed for example in EP-A 0691201 Example 1.
- ID documents In the market for security and/or value documents, in particular identification documents (ID documents), there is a need for colored personalization of these documents using lasers.
- ID documents In recent years, in particular in the field of security and/or value documents, in particular ID documents, methods have been developed which allow the creation of colored elements in these documents, which are made up entirely or partially of polymer films. These processes are described, for example, in WO-A 03/056507, EP-A 2752302 or JP-A 2012-011688, but are associated with considerable technical effort. All procedures include one Printing process to realize the coloring. This also applies to the methods described in US Pat. No. 5,714,249 A1 or in CN 1415481 A.
- WO-A 2017/167651 discloses a method for partially unicoloring, in particular for colored laser engraving, of plastic parts, in particular of thermoplastic plastic parts, very particularly of plastic films.
- WO-A 03/056507 discloses a method in which a colored image is created on a film by means of laser engraving. For this purpose, a color that interacts with a certain wavelength of laser light is printed over the entire surface on which a colored image is to be created later. The reaction manifests itself in fading of the color pigments as soon as they are exposed to the laser. Using three types of pigments, e.g. red, yellow, blue, interacting at three different wavelengths, it is possible to create full color images. However, this method is particularly complex, since three different laser sources with different wavelengths have to be used and the color has to be printed over the entire surface. As a result, the composite adhesion of the films after lamination in the image area is not good.
- JP-A 2012-011689 discloses a method and an apparatus for color laser printing on moldings without damaging the substrate.
- the ink is applied to the molded part using an inkjet and then this ink is fixed to the molded part using a laser beam.
- the entire molded part is first sprayed with ink.
- GB 2083726 A describes multicolored donor elements which can be heated to render color transferable to substrates.
- US5,241,900 and WO97/38865 also describe a laser light absorber in the donor element,
- WO 2017167651 A1 describes the transfer of dye onto substrates from a dyeing bath.
- a disadvantage of the described method, in addition to the high resource intensity, is the sharpness and positional accuracy of the resulting partial coloring, in particular the resulting colored laser engraving.
- the object of the present invention was therefore to provide an improved method for partial coloring, in particular for colored laser engraving, of plastic parts, preferably thermoplastic parts, very particularly thermoplastic parts comprising a layered structure, such as plastic films and/or film layer composites, with at least a disadvantage is ameliorated at least in part.
- a further object of the invention was to introduce rapid, precisely positioned, sharp and uniformly intensive coloring, in particular colored laser engraving, into plastic parts be able.
- a further object of the invention was to provide a method for the partial coloring of plastic parts which makes it possible to partially color plastic parts which are sensitive to solvents, dyes or other additives.
- thermoplastic parts preferably thermoplastic parts, very particularly preferably thermoplastic parts, comprising a layer structure
- non-ionizing radiation includes those electromagnetic waves whose energy is not sufficient to ionize other atoms, since the amount of energy of the photons is below the binding energies of molecules or ionization energies of the atoms. This can also include light sources that can in principle generate amounts of energy in specific wavelength ranges in order to ionize atoms, but which are used in an intensity range so that no ionization of atoms can take place.
- the provision of the plastic part (A) in step i) can be any provision that the person skilled in the art would select for this purpose.
- the providing is laying, setting, positioning or building up the plastic part (A) on a surface such as a table.
- the laying of the ribbon (B) on at least part of the at least one surface of the plastic part (A) to obtain a surface of the plastic part (A) covered with the ribbon (B) in step ii) can be done in any way that the person skilled in the art can do for this would select.
- the hang up of the ribbon preferably takes place by creating a negative pressure between the ribbon and the plastic part.
- the negative pressure is preferably in a range from 10 to 500 mbar, more preferably in a range from 50 to 400 mbar below normal pressure, which is defined as 1013 mbar.
- the colored ribbon (B) can be pressed onto the plastic part (A) with overpressure, preferably with a pressure of 0.01 N/cm 2 to 100 N/cm 2 .
- the ink ribbon (B) preferably has a width in a range from 5 mm to 100 cm, more preferably from 10 mm to 50 cm, further preferably from 1 to 20 cm.
- the ribbon can be of any length.
- the color ribbon preferably has a length in a range from 1 m to 1000 m, more preferably from 10 m to 500 m, further preferably from 50 to 100 m.
- the irradiation in step iii) can be done in any way that one skilled in the art would choose.
- the preferably non-ionizing electromagnetic radiation (C) is preferably radiated in at an angle of 45° to 90° relative to the plane of the ribbon (B), particularly preferably perpendicularly ⁇ 10° to the ribbon (B).
- the energy transferred to the ribbon and the plastic part (A) during the irradiation in step iii) is preferably in an area where, apart from the transfer of colorant from the ribbon (B) to the plastic part (A), no material is applied to the plastic part (A). transferred or merged with it.
- the method according to the invention is characterized in particular by the fact that the partial coloring of the plastic part, in particular the thermoplastic part, very particularly the thermoplastic part comprising a layer structure, essentially at the points irradiated in step iii) of the method, in a particularly high intensity and high Sharpness of coloring takes place.
- the method according to the invention is also distinguished by the fact that the colorant, in particular the colorant, has a large penetration depth into the plastic part.
- the penetration depth of the partial coloring is preferably in a range from 10 to 500 ⁇ m, more preferably in a range from 20 to 300 ⁇ m, particularly preferably in a range from 50 to 200 ⁇ m.
- the colored ribbon (B) is removed from the plastic part (A) after step iii) in a step iv).
- the removal of the ribbon (B) in step iv) can be done in any way that would be chosen by the person skilled in the art.
- the ribbon (B) is preferably removed by releasing any vacuum applied when the ribbon (B) is placed in step ii). If no vacuum was applied in step ii), the ribbon (B) is removed either by hand or by lifting the roll-to-roll device.
- a removal means such as air pressure or a lever can be used to lift the ribbon (B) from the plastic part (A).
- the focused, preferably non-ionizing, electromagnetic radiation (C) is laser radiation with a wavelength in the range from 500 to 15,000 nm, preferably in the range from 1,000 to 10,000 nm, particularly preferably in the range from 1,500 to 5 000 nm.
- the rest of the plastic part (A) has no or only very weak coloring in the non-irradiated areas. It is thus possible to color specific areas of the plastic part in order, for example, to apply an image, personalization, logo, symbol or lettering to this plastic part using the method according to the invention. These cannot be removed from the plastic surface without destroying the plastic part.
- the method according to the invention is therefore particularly suitable for the production of security and identification documents.
- these colored elements achieve particularly high resolutions of >5000 dpi, preferably >6000 dpi, particularly preferably from 5000 to 10,000 dpi.
- the method according to the invention requires neither a high-precision printing technique nor the use of different laser intensities, for example lasers which emit in different wavelengths, provided that the irradiation in step iii) takes place with laser radiation.
- the method according to the invention is suitable for applying colored elements both to two- and/or three-dimensional plastic parts (A) and to thermoplastic plastic parts (A) comprising a layered structure containing one or more layers of a thermoplastic.
- Highly focused laser systems can produce continuous colored lines, which is a feature of security printing, preferably with a width of 10 ⁇ m. This is currently only possible with processes that require full wetting of the plastic part with the dye.
- the use of a paint strip that is only brought into contact with the plastic part (A) by being placed on it prevents the remaining surface of the plastic part (A) from also being colored and then having to be washed off or freed from the paint material with solvents. This is particularly advantageous if the plastic part is sensitive to solvents, dyes or other additives that are used in conventional partial coloring.
- the paint strip can be placed directly on the plastic part (A) in order to be able to ensure paint transfer.
- the plastic part (A), preferably the thermoplastic part, very particularly preferably the thermoplastic part comprising a layer structure, contains a thermoplastic selected from polymers of ethylenically unsaturated monomers and/or polycondensates of bifunctional reactive compounds and/or polyaddition products of bifunctional ones reactive compounds.
- a transparent thermoplastic material preferably in the form of plastic films.
- thermoplastics are one or more polycarbonate(s) or copolycarbonate(s) based on diphenols, poly- or copolyacrylate(s) and poly- or copolymethacrylate(s), such as, for example and preferably, polymethyl methacrylate or poly(meth)acrylate ( PMMA), poly- or copolymer(s) with styrene as exemplified and preferably polystyrene (PS), acrylonitrile butadiene styrene (ABS) or polystyrene acrylonitrile (SAN), thermoplastic polyurethane(s) and polyolefin(s) as exemplified and preferably polypropylene types or polyolefins based on cyclic olefins (e.g.
- TOPAS ® Hoechst
- poly- or copolycondensate(s) of terephthalic acid such as, for example and preferably, poly- or copolyethylene terephthalate (PET or CoPET), glycol-modified PET ( PETG), glycol-modified poly- or copolycyclohexanedimethylene terephthalate (PCTG) or poly- or copolybutylene terephthalate (PBT or CoPBT) ), polyamide (PA), poly- or copolycondensate(s) of naphthalene ndicarboxylic acid, such as, for example and preferably, polyethylene glycol naphthalate (PEN), poly- or copolycondensate(s) of at least one cycloalkyldicarboxylic acid, such as, for example and preferably, polycyclohexane dimethanolcyclohexanedicarboxylic acid (PCCD), polysulfones (PSU), mixture
- thermoplastics are polycarbonates or copolycarbonates with average molecular weights Mw from 500 to 100,000 g/mol, preferably from 10,000 to 80,000 g/mol, particularly preferably from 15,000 to 40,000 g/mol.
- thermoplastics are one or more polycarbonate(s) or copolycarbonate(s) based on diphenols or blends containing at least one polycarbonate or copolycarbonate.
- Blends containing at least one polycarbonate or copolycarbonate and at least one poly- or copolycondensate of terephthalic acid, naphthalene dicarboxylic acid or a cycloalkyl dicarboxylic acid, preferably cyclohexane dicarboxylic acid are very particularly preferred.
- thermoplastics are polycarbonates or copolycarbonates, in particular with average molecular weights Mw from 500 to 100,000 g/mol, preferably from 10,000 to 80,000 g/mol, particularly preferably from 15,000 to 40,000 g/mol, or their blends with at least one Poly- or copolycondensate of terephthalic acid with average molecular weights Mw from 10,000 to 200,000 g/mol, preferably from 21,000 to 120,000 g/mol.
- polyalkylene terephthalates are suitable as poly- or copolycondensates of terephthalic acid.
- Suitable polyalkylene terephthalates are, for example, reaction products from aromatic dicarboxylic acids or their reactive derivatives (e.g. dimethyl esters or anhydrides) and aliphatic, cycloaliphatic or araliphatic diols and mixtures of these reaction products.
- Preferred polyalkylene terephthalates can be prepared from terephthalic acid (or its reactive derivatives) and aliphatic or cycloaliphatic diols having 2 to 10 carbon atoms by known methods (Plastic Handbook, Vol. VIII, p. 695 ff, Karl-Hanser-Verlag, Kunststoff 1973 ).
- Preferred polyalkylene terephthalates contain at least 80 mol %, preferably 90 mol %, of terephthalic acid residues, based on the dicarboxylic acid component, and at least 80 mol %, preferably at least 90 mol % of ethylene glycol and/or 1,4-butanediol and/or 1, 4-cyclohexanedimethanol residues based on the diol component.
- the preferred polyalkylene terephthalates can contain up to 20 mol % residues of other aromatic dicarboxylic acids having 8 to 14 carbon atoms or aliphatic dicarboxylic acids having 4 to 12 carbon atoms, such as residues of phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid , 4,4'-diphenyldicarboxylic acid, succinic, adipic, sebacic acid, azelaic acid, cyclohexanediacetic acid.
- the preferred polyalkylene terephthalates can contain up to 80 mol % of other aliphatic diols having 3 to 12 carbon atoms or cycloaliphatic diols having 6 to 21 carbon atoms, e.g. B.
- the polyalkylene terephthalates can by incorporating relatively small amounts of 3- or 4-hydric alcohols or 3- or 4-basic carboxylic acids, as z. B. are described in DE-OS 19 00270 and US Pat. No. 3,692,744.
- preferred branching agents are trimesic acid, trimellitic acid, trimethylolethane and trimethylolpropane and pentaerythritol.
- polyalkylene terephthalates which have been prepared solely from terephthalic acid and its reactive derivatives (eg its dialkyl esters) and ethylene glycol and/or 1,4-butanediol and/or 1,4-cyclohexanedimethanol residues, and mixtures of these polyalkylene terephthalates.
- Preferred polyalkylene terephthalates are also copolyesters made from at least two of the abovementioned acid components and/or from at least two of the abovementioned Alcohol components are prepared, particularly preferred copolyesters are poly (ethylene glycol / butanediol-1, 4) terephthalate.
- the polyalkylene terephthalates preferably used as a component preferably have an intrinsic viscosity of approx. 0.4 to 1.5 dl/g, preferably 0.5 to 1.3 dl/g, measured in each case in phenol/o-dichlorobenzene (1:1 wt . parts) at 25°C.
- the blend of at least one polycarbonate or copolycarbonate with at least one poly- or copolycondensate of terephthalic acid is a blend of at least one polycarbonate or copolycarbonate with poly- or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate.
- Such a blend of polycarbonate or copolycarbonate with poly- or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate can preferably be one with 1 to 90% by weight polycarbonate or copolycarbonate and 99 to 10% by weight poly- or Copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate, preferably with 1 to 90% by weight polycarbonate and 99 to 10% by weight polybutylene terephthalate or glycol-modified polycyclohexanedimethylene terephthalate, the proportions adding up to 100% by weight.
- Such a blend of polycarbonate or copolycarbonate with poly- or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate can particularly preferably be one with 20 to 85% by weight polycarbonate or copolycarbonate and 80 to 15% by weight Poly- or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate, preferably with 20 to 85% by weight polycarbonate and 80 to 15% by weight polybutylene terephthalate or glycol-modified polycyclohexanedimethylene terephthalate, the proportions being 100% by weight add.
- Such a blend of polycarbonate or copolycarbonate with poly- or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate can very particularly preferably be one with 35 to 80% by weight polycarbonate or copolycarbonate and 65 to 20% by weight poly - Or copolybutylene terephthalate or glycol-modified poly- or copolycyclohexanedimethylene terephthalate, preferably with 35 to 80% by weight polycarbonate and 65 to 20% by weight polybutylene terephthalate or glycol-modified polycyclohexanedimethylene terephthalate, the proportions adding up to 100% by weight .
- it can be a matter of blends of polycarbonate and glycol-modified polycyclohexanedimethylene terephthalate in the aforementioned compositions.
- Aromatic polycarbonates or copolycarbonates are particularly suitable as polycarbonates or copolycarbonates.
- the polycarbonates or copolycarbonates can be linear or branched in a known manner. These polycarbonates can be prepared in a known manner from diphenols, carbonic acid derivatives, any chain terminators and any branching agents. Details of the production of polycarbonates have been laid down in many patent specifications for about 40 years. An example is Schnell, "Chemistry and Physics of Polycarbonates", Polymer Reviews, Volume 9, Interscience Publishers, New York, London, Sydney 1964, on D. Freitag, U. Grigo, PR Müller, H.
- Suitable diphenols can be, for example, dihydroxyaryl compounds of the general formula (I),
- dihydroxyaryl compounds examples include: dihydroxybenzenes, dihydroxydiphenyls, bis(hydroxyphenyl) alkanes, bis(hydroxyphenyl) cycloalkanes, bis(hydroxyphenyl) aryls, bis(hydroxyphenyl) ethers, bis(hydroxyphenyl) ketones, Bis(hydroxyphenyl) sulfides, bis(hydroxyphenyl) sulfones, bis(hydroxyphenyl) sulfoxides, 1,r-bis(hydroxyphenyl)diisopropylbenzenes, and their nucleus-alkylated and nucleus-halogenated compounds.
- dihydroxyaryl compounds examples include resorcinol, 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)methane, bis(3,5-dimethyl-4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)diphenylmethane , 1 , 1 -bis(4-hydroxyphenyl)-1-phenyl-ethane, 1 ,1-bis(4-hydroxyphenyl)- 1 -(1-naphthyl)-ethane, 1 ,1-bis(4- hydroxyphenyl)-1-(2-naphthyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis -(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)-1-phenylpropane, 2,2-bis(4-hydroxyphenyl)-1
- R 1 and R 2 are independently hydrogen, halogen, preferably chlorine or bromine, Ci-Cs-alkyl, CVCVCycloalkyl.
- R 3 and R 4 can be selected individually for each X, independently of one another hydrogen or Ci-G, - alkyl and
- X is carbon, with the proviso that on at least one atom X, R 3 and R 4 are simultaneously alkyl.
- preference is given to alkyl on one or two atom(s) X, in particular on only one atom, XR 3 and R 4 simultaneously.
- the preferred alkyl radical for the radicals R 3 and R 4 in formula (Ia) is methyl.
- the X atoms in the alpha position to the diphenyl-substituted C atom (Cl) are preferably not dialkyl-substituted, whereas alkyl disubstitution in the beta-position to Cl is preferred.
- a very particularly preferred dihydroxydiphenylcycloalkane of the formula (Ia) is 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (formula (Ia-1) where R 1 and R 2 are H).
- Such polycarbonates can be prepared according to EP-A 359 953 from dihydroxydiphenylcycloalkanes of the formula (Ia).
- dihydroxyaryl compounds are resorcinol, 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)diphenylmethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxyphenyl) - 1-(1-naphthyl)ethane, bis(4-hydroxyphenyl)-1-(2-naphthyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3 ,5-dimethyl-4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-
- Very particularly preferred dihydroxyaryl compounds are 4,4'-dihydroxydiphenyl and 2,2-bis(4-hydroxyphenyl)propane.
- Both a dihydroxyaryl compound to form homopolycarbonates and different dihydroxyaryl compounds to form copolycarbonates can be used. Both a dihydroxyaryl compound of the formula (I) or (Ia) with the formation of homopolycarbonates and a plurality of dihydroxyaryl compounds of the formula (I) and/or (Ia) with the formation of copolycarbonates can be used.
- the various dihydroxyaryl compounds can be linked to one another either randomly or in blocks.
- the molar ratio of dihydroxyaryl compounds of the formula (Ia) to the other dihydroxyaryl compounds of the formula (I) that may also be used is preferably between 99 mol % (Ia) to 1 mol -% (I) and 2 mol% (Ia) to 98 mol% (I), preferably between 99 mol% (Ia) to 1 mol% (I) and 10 mol% (Ia) to 90 mol -% (I) and in particular between 99 mol% (Ia) to 1 mol% (I) and 30 mol% (Ia) to 70 mol% (I).
- a very particularly preferred copolycarbonate can be prepared using l,l-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and 2,2-bis(4-hydroxyphenyl)propane dihydroxyaryl compounds of the formula ( Ia) and (I) are produced.
- Suitable carbonic acid derivatives can be, for example, diaryl carbonates of the general formula (II), wherein
- R, R' and R" are independently identical or different for hydrogen, linear or branched Ci-C34-alkyl, C6-C34-alkylaryl or CVG-aryl, R can also mean -COO -R", where R" represents hydrogen, linear or branched C 1 -C 34 -alkyl, C 6 -C 34 -alkylaryl or G, -C ', 4-aryl.
- diaryl carbonates are diphenyl carbonate, methylphenyl phenyl carbonate and di-(methylphenyl) carbonate, 4-ethylphenyl phenyl carbonate, di-(4-ethylphenyl) carbonate, 4-n-propylphenyl phenyl carbonate, di- (4-n-propylphenyl) carbonate, 4-isopropylphenyl phenyl carbonate, Di-(4-isopropylphenyl) carbonate, 4-n-butylphenyl phenyl carbonate, di-(4-n-butylphenyl) carbonate, 4-isobutylphenyl phenyl carbonate, di-(4-iso -butylphenyl) carbonate, 4-tert-butylphenyl phenyl carbonate, di-(4-tert-butylphenyl) carbonate, 4-n-pentylphenyl phenyl carbonate, di
- Biphenyl-4-yl-phenyl-carbonate Di-(biphenyl-4-yl)-carbonate, 4-(1-Naphthyl)-phenyl-phenyl-carbonate, 4-(2-Naphthyl)-phenyl-phenyl-carbonate, Di-[4-(1-naphthyl)-phenyl]-carbonate, Di-[4-(2-naphthyl)-phenyl]-carbonate, 4-Phenoxyphenyl-phenyl-carbonate, Di-(4-phenoxyphenyl)-carbonate, 3 - Pentadecylphenyl phenyl carbonate, di-(3 -pentadecylphenyl) carbonate, 4-tritylphenyl phenyl carbonate, di-(4-tritylphenyl) carbonate, methyl salicylate phenyl carbonate, di-(methyl salicylate) carbonate, e
- diaryl compounds are diphenyl carbonate, 4-tert-butylphenyl phenyl carbonate, di-(4-tert-butylphenyl) carbonate, biphenyl-4-yl-phenyl carbonate, di-(biphenyl-4-yl)-carbonate, 4-( 1 -Methyl- 1 -phenylethyl)phenyl phenyl carbonate, di[4-( 1 -methyl- 1 -phenylethyl)phenyl] carbonate and di(methyl salicylate) carbonate.
- Diphenyl carbonate is very particularly preferred.
- one or more monohydroxyaryl compound(s) can additionally be used as chain terminators, for example, which were not used to prepare the diaryl carbonate(s) used.
- chain terminators for example, which were not used to prepare the diaryl carbonate(s) used.
- These can be those of the general formula (III), whereby
- R A is linear or branched Ci-C34-alkyl, C6-C34-alkylaryl, CVC-aryl or -COO -R°, where R° is hydrogen, linear or branched Ci-C34-alkyl, C6- C34 -alkylaryl or C6-C34-aryl, and R b , RC independently of one another, identical or different, represent hydrogen, linear or branched Ci-C34-alkyl, C7-C34-alkylaryl or CVC-aryl.
- Such monohydroxyaryl compounds are, for example, 1-, 2- or 3-methylphenol, 2,4-dimethylphenol, 4-ethylphenol, 4-n-propylphenol, 4-isopropylphenol, 4-n-butylphenol, 4-isobutylphenol, 4-tert-butylphenol , 4-n-pentylphenol, 4-n-hexylphenol, 4-iso-octylphenol, 4-n-nonylphenol, 3-pentadecylphenol, 4-cyclohexylphenol, 4-(1-methyl-1-phenylethyl)-phenol, 4-phenylphenol , 4-phenoxyphenol, 4-(l-naphthyl)-phenol, 4-(2-naphthyl)-phenol, 4-tritylphenol, methyl salicylate, ethyl salicylate, n-propyl salicylate, iso-propyl salicylate, n-butyl salicylate, iso-
- Suitable branching agents can be compounds with three or more functional groups, preferably those with three or more hydroxyl groups.
- suitable compounds having three or more phenolic hydroxyl groups are phloroglucinol, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptene-2,4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl)-heptane, l,3,5-tri-(4-hydroxyphenyl)-benzene, l,l,l-tri-(4-hydroxyphenyl)-ethane, tri-(4-hydroxyphenyl)-phenylmethane, 2,2-bis(4,4-bis(4-hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxyphenylisopropyl)phenol and tetra(4-hydroxyphenyl)methane.
- Examples of other suitable compounds with three or more functional groups are 2,4-dihydroxybenzoic acid, trimesic acid (trichloride), cyanuric acid trichloride and 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole.
- Preferred branching agents are 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole and 1,1,1-tri(4-hydroxyphenyl)ethane.
- the plastic part containing the abovementioned thermoplastic polymers can be extruded, coextruded, cast, three-dimensionally printed and/or injection molded.
- the plastic part can also be a three-dimensional plastic part.
- the plastic part can also be a plastic part comprising a layer structure such as films, film layer composites and/or plates, as well as combinations thereof, e.g. back-injected films containing the polymers described above.
- the plastic part is particularly preferably a film, film layer composite and/or a plate containing the aforementioned polymers, which are produced by extrusion and/or coextrusion.
- the plastic part (A) in particular a thermoplastic part, very particularly a thermoplastic part comprising a layer structure, comprises at least one additive which has an absorption maximum in the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation used, or that Plastic part (A) is coated with at least one additive in the form of a coating agent which has an absorption maximum in the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation used.
- the additive comprises at least one or more organic and/or inorganic IR absorbers.
- laser-sensitive additives are suitable as additives, so-called laser marking additives, i.e. those consisting of an absorber in the wavelength range of the radiation to be used (C).
- the additive preferably comprises at least one or more organic and/or inorganic IR absorbers, preferably inorganic IR absorbers.
- Such additives and their use in molding compositions are described, for example, in WO-A 2004/50766 and WO-A 2004/50767 and are commercially available from DSM under the brand name MicabsTM.
- NIR near infrared
- infrared absorbers known from the literature are suitable, as they are known, for. B. in M. Matsuoka, Infrared Absorbing Dyes, Plenum Press, New York, 1990 are described in terms of substance classes.
- Infrared absorbers from the substance classes of the azo, azomethine, methine, anthraquinone, indanthrene, pyranthrone, flavanthrone, benzanthrone, phthalocyanine, perylene, dioxazine, thioindigo, isoindoline, isoindolinone, Quinacridone, pyrrolopyrrole or quinophthalone pigments and metal complexes of azo, azomethine or methine dyes or metal salts of azo compounds.
- phthalocyanines and naphthalocyanines are particularly suitable. Because of the improved solubility in thermoplastics, phthalocyanines and naphthalocyanines with bulky side groups are preferable.
- Suitable inorganic IR absorbers are, for example, mixed oxides of metals such as phosphorus-containing tin-copper mixed oxides, such as described in WO-A 2006/042714, those from the group of borides and/or tungstates and mixtures thereof, preferably at least one or more IR absorbers from the group of borides and/or tungstates, and mixtures thereof, particularly preferably at least one or more IR absorbers from the group of tungstates.
- Dysprosium boride (DyB ( ,). Holmium boride (HoB ( ). Yttrium boride (YB ( ). Samarium boride (SmB ( ). Europium boride (EuB ( ,).
- Erbium boride ErB ( ,), thulium boride (TmB ( ), ytterbium boride (YbB ( ), lutetium boride (LuB ( ,), strontium boride (SrB ( ), calcium boride (CaB ( ), titanium boride (T1B2), Zirconium boride (ZrB 2 ), Hafnium boride (HfB 2 ), Vanadium boride (VB 2 ), Tantalum boride (TaB 2 ), Chromium boride (CrB and CrB 2 ), Molybdenum boride (M0B 2 , M0 2 B 5 and MoB), Tungsten boride (W 2 B 5 ), or combinations of these borides are suitable.
- the sole use of CS 033 WO 3 as an inorganic IR absorber is particularly preferred. Also preferred are Cs/W ratios of 0.20 and 0.25.
- the woframates are preferable to the borides because of their low inherent coloration if the process according to the invention is to be carried out on plastic parts which have a radiation transmittance of >10% to ⁇ 99%, preferably >30% to ⁇ 95% > 40% to ⁇ 93% for the selected radiation, determined using the UV-VIS-NIR-MIR method in accordance with DIN EN ISO/IEC 17025.
- tungsten trioxide, tungsten dioxide, a hydrate of a tungsten oxide, tungsten hexachloride, ammonium tungstate or tungstic acid and optionally other salts containing the element M, such as cesium carbonate are mixed in certain stoichiometric ratios so that the molar ratios of the individual components are given by the formula M x W y O z are played back.
- This mixture is then treated at temperatures between 100° C. and 850° C. in a reducing atmosphere, for example an argon hydrogen atmosphere, and finally the powder obtained is tempered at temperatures between 550° C. and 1200° C. under an inert gas atmosphere.
- the IR absorber can be mixed with the dispersants described below and other organic solvents, such as toluene, benzene or similar aromatic hydrocarbons, and milled in suitable mills, such as ball mills, with the addition of zirconium oxide (e.g with a diameter of 0.3 mm) to produce the desired particle size distribution.
- the nanoparticles are obtained in the form of a dispersion. After grinding, further dispersing agents can optionally be added.
- the solvent is removed at elevated temperatures and reduced pressure. Preference is given to nanoparticles which have an average size of less than 200 nm, particularly preferably less than 100 nm.
- the size of the particles can be determined using transmission electron spectroscopy (TEM).
- TEM transmission electron spectroscopy
- plastic parts (A) comprising transparent thermoplastics with a radiation permeability for the selected radiation of> 10% to ⁇ 99%, preferably from> 30% to ⁇ 95%, particularly preferably> 40% to ⁇ 93%, determined by the UV-VIS-NIR-MIR method according to DIN EN ISO/IEC 17025, the particles obtained in this way are dispersed in an organic matrix, e.g. in an acrylate, and, if necessary, as described above in a mill using suitable auxiliaries such as zirconium dioxide and optionally ground using organic solvents such as toluene, benzene or similar hydrocarbons.
- suitable auxiliaries such as zirconium dioxide and optionally ground using organic solvents such as toluene, benzene or similar hydrocarbons.
- Suitable polymer-based dispersants are, in particular, dispersants that have high transmission, such as, for example, polyacrylates, polyurethanes, polyethers, polyesters or polyester urethanes and polymers derived therefrom.
- Polyacrylates, polyethers and polyester-based polymers are preferred as dispersants, polyacrylates such as polymethyl methacrylate and polyesters being particularly preferred as dispersants which are stable at high temperatures. Mixtures of these polymers or also copolymers based on acrylate can also be used. Such dispersing aids and methods for producing tungstate dispersions are described, for example, in JP 2008214596 and in Adachi et al. J.Am. ceram. society 2007, 90 4059-4061. Suitable dispersants are commercially available.
- polyacrylate-based dispersants are suitable.
- suitable dispersing agents are available, for example, under the trade names EFKATM, e.g., EFKATM 4500 and EFKATM 4530 from Ciba Specialty Chemicals.
- Polyester-containing dispersants are also suitable. They are available, for example, under the trade names SolsperseTM, e.g., SolsperseTM 22000, 24000SC, 26000, 27000 from Avecia.
- polyether-containing dispersing agents are known, for example, under the trade names DisparlonTM DA234 and DA325 from Kusumoto Chemicals.
- Polyurethane-based systems are also suitable. Polyurethane based systems are available under the trade names EFKATM 4046, EFKATM 4047 from Ciba Specialty Chemicals. TexaphorTM P60 and P63 are corresponding trade names of Cognis.
- the amount of IR absorber in the dispersant can be 0.2% by weight to 50.0% by weight, preferably 1.0% by weight - 40.0% by weight, more preferably 5.0% by weight. % - 35.0% by weight, and most preferably 10.0% by weight - 30.0% by weight, based on the dispersion of the inorganic IR used according to the invention amount to absorbers.
- the overall composition of the ready-to-use IR absorber formulation can also contain other auxiliaries such as zirconium dioxide and residual solvents such as toluene, benzene or similar aromatic hydrocarbons.
- the amount of the inorganic IR absorbers according to the invention is not restricted whatsoever with regard to the amount of the inorganic IR absorbers according to the invention, particularly preferably those from the group of tungstates, in the polymer compositions of the plastic parts.
- the inorganic IR absorbers, in particular the tungstates can usually be used in an amount of >0.7% by weight to ⁇ 4.5% by weight, preferably >0.6% by weight to ⁇ 2% by weight. % and particularly preferably >0.7% by weight to ⁇ 1.5% by weight>, calculated as the solids content of inorganic IR absorber, are used in the overall polymer composition.
- Solids content of inorganic IR absorber means in this context the inorganic IR absorber, in particular tungstate, as a pure substance and not a dispersion, suspension or other preparation containing the pure substance, with the following information for IR content -Additive, in particular the tungstate content, always refer to this solids content, unless explicitly stated otherwise.
- IR absorbers can optionally be used in addition to the tungstates as IR absorbers, but their proportion in terms of quantity in such a mixture is in each case below that of the tungstates described above. In the case of mixtures, preference is given here to compositions which contain two up to and including five and particularly preferably two or three different IR absorbers.
- the further IR absorber is preferably selected from the group consisting of borides and tin oxides, particularly preferably containing LaB ( , or antimony-doped tin oxide or indium tin oxide.
- Such mixtures of IR absorbers are predominantly used in applications in which an inherent color of the component can be accepted up to a Delta E of 20, preferably up to a Delta E of 15, compared to the plastic part without IR absorber.
- the at least one additive which has an absorption maximum in the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation used can be contained in the plastic part.
- the ribbon (B) comprises at least one colorant, preferably at least one dye, or mixtures of these, which can be released from the ribbon by heating.
- Any material that is not transparent in the visible wavelength range can be used as the colorant and is incorporated in the color ribbon (B) in such a way that it changes color when heated solves it.
- the colorant is preferably selected from the group consisting of a dye, a colored pigment, a colored mineral or a mixture of at least two of these.
- the ink ribbon (B) comprises a dye, particularly preferably at least one dye from the group of solvent dyes and/or disperse dyes according to the classification of the Color Index, or mixtures of these dyes.
- Dyes from the group of solvent dyes according to the classification of the Color Index can be, for example, the so-called MacrolexTM dyes from Lanxess AG, Germany.
- MacrolexTM dyes from Lanxess AG, Germany.
- Examples include MacrolexTM Blue 3R, MacrolexTM Red H, MacrolexTM Yellow 6G (Solvent Yellow 179 according to CI), MacrolexTM Violet Red R (Dispers Violet 31 according to CI), MacrolexTM orange R (Solvent Orange 107 according to CI) or Mixtures of these dyes.
- Disperse dyes according to the Color Index classification can be, for example, diazo, diphenylamine and anthraquinone compounds, acetate dyes, disperse dyes and/or disperse dyes and include Disperse Blue #3, Disperse Blue #14, Disperse Yellow #3, Disperse Red #134 and Disperse Red #7.
- the classification and designation of the dyes cited above are in accordance with "The Color Index", 3rd Edition, published jointly by the Society of Dyes and Colors and the American Association of Textile Chemists and Colorists (1971).
- the dyes can generally be employed either as the sole dye ingredient or as a component of a mixture depending on the color desired.
- the term dye as used herein also includes the dye mixture.
- Suitable dyes include water-insoluble diazo-diphenylamine and anthraquinone compounds. Particularly suitable are acetate dyes, dispersed acetate dyes, disperse dyes and dispersol dyes as disclosed in Color Index 3rd Edition, Volume 2, The Society of Dyers and Colourists, 1971, pp. 2479 and 2187-2743, respectively.
- the preferred disperse dyes include Dystar's Palanil Blue E-R150 (Anthraquinone/Disperse Blue), DIANIX Orange E-3RN (Azo Dye/CI Disperse-Orange 25) and the aforementioned MacrolexTM dyes as Solvent Dyes.
- the ribbon (B) preferably comprises a dye and/or a dye mixture selected from the group of disperse dyes according to the Color Index classification, very particularly a dye selected from the group consisting of azo, diphenylamine and anthraquinone compounds.
- the color ribbon (B) more preferably comprises a dye and/or a dye mixture from the group of solvent dyes according to the classification of the Color Index, very particularly preferably a dye and/or dye mixture from the MakrolexTM dyes.
- the colorant preferably the dye
- a polymeric material such as polyester can be used as the solvent and/or dispersing agent. Preference is given to such polymer materials as are described for the dispersants with regard to the additive.
- the irradiation of the plastic part (A) in step ii) takes place with focused, preferably non-ionizing, electromagnetic radiation, the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation being selected such that the ink ribbon (B) has a radiation transmittance of > 2 % to ⁇ 99%, preferably from >5% to ⁇ 95%, particularly preferably >10% to ⁇ 93% for the selected radiation, determined by the UV-VIS-NIR-MIR method in accordance with DIN EN ISO/IEC 17025- 2018-03.
- the ribbon (B) comprises: a) a polymeric carrier, b) at least one colorant, preferably at least one dye, particularly preferably at least one dye from the solvent dyes and/or disperse dyes according to the classification of the Color Index or one Mixture of the above.
- the polymeric carrier can be any carrier containing a polymer which is suitable for use with, preferably non-ionizing, electromagnetic radiation, in particular polymeric carriers which do not melt on irradiation in step iii) and are as transparent as possible.
- Preferred polymers for building up the polymeric carrier are polymers from the group of polyesters.
- the plastic part (A) contains a layered structure, this layered structure comprising at least one layer of a thermoplastic material.
- the layer structure contains at least one layer containing at least one thermoplastic and at least one further layer containing at least one thermoplastic and at least one black pigment, preferably carbon black.
- the irradiation in step iii) takes place with a pulsed laser, preferably with pulses from 1 ns to 10000 ns, preferably from 5 ns to 5000 ns, particularly preferably 10 ns to 1000 ns duration and preferably an energy of 0, 1 J to 10 KJ, particularly preferably from 0.2 J to 8 KJ, very particularly preferably from 0.5 J to 5 KJ.
- Irradiation is particularly preferably carried out in Step iii) with a pulsed laser with pulses from 1 ns to 10,000 ns, duration and an energy from 0.1 J to 10 KJ.
- the irradiation in step iii) is preferably carried out using a pulsed laser with pulses of 5 ns to 5000 ns duration and an energy of 0.2 J to 8 KJ. Furthermore, the irradiation in step iii) preferably takes place with a pulsed laser with pulses 10 ns to 1000 ns in duration and an energy of 0.5 J to 5 KJ.
- the laser irradiation preferably takes place in continuous wave operation (CW laser).
- Pulsed laser radiation is particularly preferably used for irradiating the plastic parts.
- a laser pulse duration of fractions of a second is already sufficient to achieve a coloring of the plastic part at the laser-irradiated areas.
- Pulse durations of 10 18 to 10 1 seconds are preferably used, particularly preferably pulse durations of 10 9 to 10 2 seconds, very particularly preferably pulse durations of 10 6 to 10 3 seconds.
- the intensity of the coloring at the lasered areas can be influenced, depending on the requirements placed on the desired application.
- the higher the laser power used the more intense the coloring on the lasered areas of the plastic part.
- Sufficiently good colored engravings can be achieved with the medium power range of a 7.5 watt marking laser. In pulse mode, significantly higher performance and thus more intensive coloring in the plastic part can be achieved.
- NdYAG lasers neodymium-doped yttrium-aluminum-garnet lasers
- the energy of the laser is no longer sufficient to achieve black or gray coloring, but engraving in blue, magenta, yellow can still take place at these energy densities.
- NdYAG lasers neodymium-doped yttrium aluminum garnet lasers
- the energy input of the radiation C) in step iii) can be varied by pulses of different lengths. The shorter the pulses, the higher the pulse peak energy. Pulse peaks of 10 kJ can be achieved with pulse lengths of 1 ns to 10,000 ns.
- laser types that are suitable for engraving and welding plastics can also be used for colored laser engraving of plastic parts. So can For example, a CO2 laser can also be used. This means that the engraving can preferably be done in blue, magenta, yellow.
- the color concentration of the color band can also have an impact on the intensity of the partial coloring of the plastic part after irradiation.
- a molded part made of plastic which is produced in an injection mold according to known methods such as, for example, according to in-mold decoration (IMD), film insert molding (FIM) or high-pressure molding (HPF) Method is produced used.
- IMD in-mold decoration
- FIM film insert molding
- HPF high-pressure molding
- the plastic part is a layered structure containing at least one layer of a thermoplastic selected from polymers of ethylenically unsaturated monomers and/or polycondensates of bifunctional reactive compounds, preferably one or more polycarbonate(s) or copolycarbonate(s) based on diphenols, poly- or copolyacrylate(s) and poly- or copolymethacrylate(s), poly- or copolymer(s) with styrene, polyurethane(s) and polyolefin(s), poly - or copolycondensate(s) of terephthalic acid, poly- or copolycondensates of naphthalenedicarboxylic acid, poly- or copolycondensate(s) of at least one cycloalkyldicarboxylic acid, or mixtures of these, particularly preferably around one or more polycarbonate(s) or copolycarbonate(s)
- a thermoplastic selected from polymers of eth
- the at least one layer containing at least one thermoplastic material is very particularly preferably a film.
- This film preferably has a layer thickness of >1 ⁇ m to ⁇ 1000 ⁇ m, preferably >5 to ⁇ 800 ⁇ m, very particularly preferably >10 to ⁇ 500 ⁇ m.
- thermoplastic with regard to preferred embodiments, material, composition and additives.
- the layer structure preferably comprises at least one layer containing at least one thermoplastic as described above and at least one further layer containing at least one thermoplastic as described above and at least one laser-sensitive additive, preferably black pigment, particularly preferably carbon black.
- a laser-sensitive additive preferably black pigment, particularly preferably carbon black.
- Such layer structures are known for example from WO-A 2010/089035 and are suitable for Black and white laser engraving, especially for personalized laser engraving of security documents, and more particularly identification documents.
- the layer structure preferably has at least one layer containing at least one thermoplastic and at least one filler.
- the filler is preferably at least one color pigment and/or at least one other filler for producing translucency in the filled layers, particularly preferably a white pigment, very particularly preferably titanium dioxide, zirconium dioxide or barium sulfate, in a preferred embodiment titanium dioxide.
- a layer containing at least one thermoplastic material with at least one such filler improves the visibility of the inscription or image(s) introduced, as a result of which the perception of the improved sharpness and resolution is further increased.
- This layer structure is known from WO-A 2010/089035 and is described in detail there.
- the at least one layer of a thermoplastic preferably comprises at least one additive which has an absorption maximum in the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation used, and this at least one layer of a thermoplastic has a radiation transmittance of >10% to ⁇ 99% , preferably from >30% to ⁇ 95%, particularly preferably >40% to ⁇ 93%, for the selected radiation, determined by the UV-VIS-NIR-MIR method according to DIN EN ISO/IEC 17025, preferably an inorganic IR -Absorbem, particularly preferably an inorganic IR absorber from the group of tungstates.
- This layer preferably forms an outer layer of the layer structure, which is ultimately also laser engraved in color.
- the layer structure preferably comprises at least one outer layer of a thermoplastic containing at least one additive which has an absorption maximum in the wavelength range of the focused, preferably non-ionizing, electromagnetic radiation used, and this at least one layer of a thermoplastic has a radiation transmittance of > 10% to ⁇ 99%, preferably from >30% to ⁇ 95%, particularly preferably >40% to ⁇ 93%, for the selected radiation, determined by the UV-VIS-NIR-MIR method according to DIN EN ISO/IEC 17025, preferably an inorganic IR absorber, particularly preferably an inorganic IR absorber from the group of tungstates, and a further layer containing at least one thermoplastic and at least one laser-sensitive additive, preferably black pigment, particularly preferably carbon black and optionally a further layer of a thermoplastic comprising a fill substance, preferably a white pigment, particularly preferably titanium dioxide, zirconium dioxide or barium sulfate, very particularly preferably titanium dioxide.
- a white pigment particularly preferably titanium dioxide
- the plastic part (A), comprising the layer structure described above, can be irradiated with C) either before or after step i) or step ii) in the absence of the colored ribbon (B) as in step iii).
- the same radiation (C) can be used for this further irradiation.
- Irradiation with (C) in the absence of the colored ribbon (B) allows a black engraving to be applied to the surface, preferably in the underlying transparent and/or white layers of the layer structure, at the desired location.
- the high laser reactivity of these layer structures leads to blackening of the laser-irradiated areas when laser engraving without the color ribbon (B). If the layered structure is in contact with the colored ribbon (B), the intensity of the laser beam is reduced by the colored ribbon (B) so that only the irradiated areas are colored but the surface of the layered structure is not blackened.
- the ink layer thickness is preferably set precisely throughout the entire process and is preferably kept constant throughout the entire process in order to be able to obtain uniform laser engravings.
- the ink layer thickness is preferably from 0.001 to 10 mm, particularly preferably from 0.005 to 5 mm, very particularly preferably from 0.01 to 1 mm.
- Another object of the invention are plastic parts or plastic articles obtainable by the process according to the invention.
- the plastic part (A) is a security and/or value document, very particularly preferably an identification document.
- the security documents personalized or colored engraved according to the method according to the invention are distinguished by a high degree of security against forgery of the applied personalized or colored engraved information.
- blank documents can be personalized in color in a decentralized and forgery-proof manner.
- a plastic part (A) in the form of a laminated plastic film composite (A) (hereinafter referred to as laminate (A)) was created from two different polycarbonate films, film 1) and film 2), and provided according to step i) of the method according to the invention.
- a colored ribbon was then placed on one of the surfaces of the laminate (A) on the laminate (A) according to step ii) and colored using a laser according to step iii).
- Step i) providing the plastic part (A) in the form of a laminate (A):
- the film 1) was a MakrofolTM film made of polycarbonate with a thickness of 100 ⁇ m from Covestro Deutschland AG, with the following composition: 94.69% by weight of MakroionTM 3108 polycarbonate from Covestro GmbH AG
- lampblack 101 carbon black from Evonik-Degussa GmbH
- average particle size 95 nm (according to manufacturer information)
- the film 2) was MakrofolTM ID4-4 opaque white, made of polycarbonate with a thickness of 500 ⁇ m from Covestro Deutschland AG.
- the lamination of the films 1) and 2) to form the laminate (A) was carried out as follows.
- foils 1) and 2) were stacked as follows:
- the film stack was placed in a Buerckle model 50/100 laminating press.
- the films were laminated with the following laminating press settings so that both surfaces of the laminate (A) were formed by a film 1):
- Heating zone temperature 190°, duration 8 minutes, pressure 60 N/cm 2
- Cooling zone temperature 38°C, duration 10 minutes, pressure 100 N/cm 2
- the laminate (A) from step i) was placed on the workpiece carrier of a Foba D84S laser system so that one surface of the laminate (A) was on the workpiece carrier and the opposite surface was facing the laser.
- the laser was a diode-pumped NdYAG laser, which emitted at 1064 nm with a power of about 60 watts.
- An ink ribbon was then placed on the laminate with the ink-coated side in contact with one of the films 1) of the laminate (A).
- An ink ribbon made by DNP Co., Ltd, Type CY-35K-75D was used.
- the ribbon was fixed to the laminate (A) in the edge area and a vacuum was created between the laminate (A) and the ribbon by means of air extraction in order to prevent air pockets from forming between the laminate (A) and the ribbon.
- the slight negative pressure of about 100 mbar was maintained over the entire duration of the irradiation in step iii).
- the focus of the NdYAG laser was set on the surface of the ribbon in contact with the laminate (A).
- a frequency of 30 KHz was used for the laser engraving Laser set and a current of 28 amps.
- the feed rate of the laser was 100 mm/s.
- the laser engraving was repeated a second time but without using the ribbon.
- the laminate surface was irradiated directly by the laser. It was lasered with changed parameters, namely with 5 KHz and 32 amps. The engraved letters, numbers and symbols appeared in deep black.
- Example 2 (not according to the invention) Laser engraving in liquid
- laminate (A) the same plastic part (A) in the form of a laminated plastic film composite (A) (hereinafter referred to as laminate (A)) as described for example 1) was colored by means of a dye bath, as in the prior art in patent application WO -A 2017/167651.
- the immersion depth is understood as meaning the path or the penetration depth of the radiation C) used into the dyeing bath up to the surface of the plastic part (A) to which the partial dyeing is to be applied.
- composition of the dyeing bath was used:
- Macrolex® Blue 3R (dye from Lanxess AG Germany)
- ethylene glycol butyl ether (solvent, The Dow Chemical Company)
- the focus of the laser was adjusted to the surface of the laminate (A).
- a frequency of 30 KHz and a current of 28 amperes were set for the laser engraving.
- the feed rate of the laser was 100 mm/s.
- Letters, numbers and symbols were engraved on the laminate.
- the engravings were intensely colored.
- the laser engraving had developed into a tactile form.
- the engraving was raised enough to be felt and clearly visible.
- the laser engraving was then repeated a second time but without the coloring liquid.
- the laminate surface was irradiated directly by the laser. It was lasered with changed parameters, namely with 5 KHz and 32 amps.
- Determination of the depth of penetration of the dyes into the laminate A strip about 20 ⁇ m thin was cut from the cross section of the laminate using a Thermo scientific HM 355S microtome. When viewing the cross section under a microscope at 100x magnification in transmitted light, the coloring of the 100 ⁇ m thick film 1) could be determined. The penetration depth of the coloring could only be determined in the outer area of the film 1), at a maximum depth of 25 ⁇ m.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US18/553,752 US20240209169A1 (en) | 2021-04-14 | 2022-04-11 | Process for partial colouring of plastic parts using solid colourants in colour-carrier layers |
EP22722423.5A EP4323195A1 (de) | 2021-04-14 | 2022-04-11 | Verfahren für das partielle einfärben von kunststoffteilen mittels fester farbstoffe in farbträgerschichten |
CN202280028548.XA CN117203063A (zh) | 2021-04-14 | 2022-04-11 | 使用颜色载体层中的固体染料将塑料部件进行局部着色的方法 |
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- 2022-04-11 US US18/553,752 patent/US20240209169A1/en active Pending
- 2022-04-11 WO PCT/EP2022/059577 patent/WO2022218900A1/de active Application Filing
- 2022-04-11 EP EP22722423.5A patent/EP4323195A1/de active Pending
- 2022-04-11 CN CN202280028548.XA patent/CN117203063A/zh active Pending
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