WO2008086931A1 - Dithiolene metal complex colorless ir absorbers - Google Patents

Dithiolene metal complex colorless ir absorbers Download PDF

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Publication number
WO2008086931A1
WO2008086931A1 PCT/EP2007/064102 EP2007064102W WO2008086931A1 WO 2008086931 A1 WO2008086931 A1 WO 2008086931A1 EP 2007064102 W EP2007064102 W EP 2007064102W WO 2008086931 A1 WO2008086931 A1 WO 2008086931A1
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WO
WIPO (PCT)
Prior art keywords
unsubstituted
substituted
compounds
independently
alkyl
Prior art date
Application number
PCT/EP2007/064102
Other languages
French (fr)
Inventor
Urs Lehmann
Daniel Heizler
Original Assignee
Ciba Holding Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ciba Holding Inc. filed Critical Ciba Holding Inc.
Priority to CN200780047902.9A priority Critical patent/CN101610893B/en
Priority to EP07857732.7A priority patent/EP2101986B1/en
Priority to US12/520,889 priority patent/US20100021833A1/en
Priority to JP2009545845A priority patent/JP2010516823A/en
Publication of WO2008086931A1 publication Critical patent/WO2008086931A1/en
Priority to US15/255,418 priority patent/US9738611B2/en
Priority to US15/623,699 priority patent/US9920087B2/en
Priority to US15/837,371 priority patent/US10112964B2/en

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    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/006—PBT, i.e. polybutylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2081/00—Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, as moulding material
    • B29K2081/04—Polysulfides, e.g. PPS, i.e. polyphenylene sulfide or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2081/00—Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, as moulding material
    • B29K2081/06—PSU, i.e. polysulfones; PES, i.e. polyethersulfones or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0085—Copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0088—Blends of polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0017—Heat stable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/002—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing

Definitions

  • the invention relates to the use of specific dithiolene metal complexes as colorless IR absorbers.
  • the invention relates also to novel dithiolene metal complexes.
  • IR absorbers meet a significant technical need in a wide range of applications, such as security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the drying and curing of print, the fixing of toners on paper, optical filters for PDPs (plasma display panels), laser marking, the heating of plastics preforms etc.
  • IR absorbers such as, for example, quinone-diimmonium or aminium salts, polymethines (e.g. cyanines, squaraines, croconaines), phthalocyanines and naphthalocyanines, dithiolene and other metal complexes.
  • polymethines e.g. cyanines, squaraines, croconaines
  • phthalocyanines and naphthalocyanines e.g. cyanines, squaraines, croconaines
  • phthalocyanines and naphthalocyanines naphthalocyanines
  • dithiolene and other metal complexes e.g., dithiolene and other metal complexes.
  • Newer structures such as, for example, quaterrylene diimides, have also recently become known.
  • inorganic substances such as, for example, lanthanum hexaboride, indium tin oxide (ITO), antimony tin oxide (ATO) in nano- particulate form and coated mica materials ("Lazerflair” from Merck).
  • IR absorbers for example for security printing, are available, for example, from “American Dye Source”, but virtually all of them have an absorption in the VIS range of the spectrum (from 400 to 700 nm).
  • substituents Ri to R 6 or R 1 to R 4 are Ci-Ci 8 alkyl radicals they are preferably unsubstituted Ci-Ci 8 alkyl radicals, more preferably Ci-C 8 alkyl radicals, including straight- chain and branched and also cyclic alkyl radicals.
  • the following may be mentioned as examples: propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-hexyl, 2-ethylhexyl, n-octyl, cyclopentyl, cyclohexyl.
  • substituents Ri to R 6 or R 1 to R 4 are CrCi 8 alkenyl radicals they are preferably unsubstituted CrCi 8 alkenyl radicals, more preferably CrC 6 alkenyl radicals. Examples may be vinyl or allyl.
  • substituents Ri to R 6 or R 1 to R 4 are aryl groups, they are preferably unsubstituted aryl groups, for example, phenyl, naphthyl, anthryl or phenanthryl groups.
  • substituents R 1 to R 6 or R 1 to R 4 are heteroarylalkyl radicals they are preferably unsubstituted heteroarylalkyl radicals which denotes that a heteroaromatic ring is bonded directly to an alkyl group.
  • the heteroaromatic ring is, for example, imidazolyl, pyridyl, thienyl, furyl, thiazolyl, indolyl, quinolinyl, pyrazolyl, pyrazyl, pyridazyl or pyrimidinyl.
  • the substituents R 7 and R 8 are preferably CrC 6 alkyl radicals.
  • Xi, X 2 and X 3 are each independently of the others sulfur or oxygen,
  • Ri, R2, R3, R 4 are each independently of the others -N(CrC 6 alkyl) 2 , unsubstituted
  • Colorless IR absorbers can be used in all fields of application that depend on the IR absorber's remaining invisible. The following uses may be mentioned by way of example: security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the drying and curing of print, the fixing of toners on paper, laser marking (plastics materials, paper, wood etc.) and the heating of plastics preforms. (Claim 5)
  • the IR absorbers of formulae I and Il can also be in the form of mixtures with further known IR absorbers, especially mixtures with polymethines (cyanines, squaraines and croconaines). Such IR absorber mixtures are suitable especially for security printing, (claim 8)
  • the IR absorbers are used in a concentration of from 10 ppm to 10 %, preferably 100 ppm to 2 % depending on the chosen application.
  • the laser welding is preferably carried out using an ND:YAG laser at 1064 nm or using a diode laser at 980 nm or 940 nm, and the concentration of IR absorber is, for example, from 5 to 500 ppm, preferably from 10 to 100 ppm.
  • the dithiolenes according to the invention are suitable especially for welding transparent plastics materials, such as polypropylene, polyvinylbutyral, polyamide, polycarbonate, polycarbonate-polyethylene terephthalate blends, polycarbonate-polybutylene terephthalate blends, polycarbonate- acrylonitrile-styrene-acrylonitrile copolymer blends, polycarbonate-acrylonitrile-butadiene- styrene copolymer blends, polymethyl methacrylate-acrylonitrile-butadiene-styrene co- polymer blends (MABS), polyethylene terephthalate, polybutylene terephthalate, polymethyl methacrylate, polybutyl acrylate, polymethyl methacrylate-polyvinylidene difluoride blends, acrylonitrile-butadiene-styrene copolymers (ABS), st
  • Especially advantageous in welding is the use of two identically transparent plastics workpieces, for example colorless-transparent/colorless-transparent or colored-transparent/colored-transparent.
  • IR absorber is added to the printing ink.
  • Suitable printing inks are water-based, oil-based or solvent-based printing inks, based on pigment or dye, for inkjet printing, flexographic printing, screen printing, intaglio printing, offset printing, laser printing or letterpress printing and for use in electrophotography.
  • the invention relates also to novel dithiolene compounds of formulae I and Il wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, Xi is oxygen and X 2 and X3 are oxygen or sulfur,
  • Ri, R2, R3, R 4 , R5 and R 6 are each independently of the others hydrogen, NR 7 R 8 , unsubstituted or substituted CrCi 8 alkyl, Ci-Ci 8 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted Ci-Ci 8 alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R 7 and R 8 , each independently of the other, being unsubstituted or substituted Ci-Ci 8 alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl. (Claim 9)
  • the invention relates also to novel dithiolene compounds of formulae I and Il wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, Xi, X 2 and X3 are each independently of the others sulfur or oxygen, Ri, R2, R3, R 4 , R5 and R 6 are NR 7 R 8 , wherein R 7 and R 8 are each independently of the other unsubstituted or substituted Ci-Ci 8 alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl. (claim 10).
  • -NR 7 R 8 is -N(Ci-C 6 alkyl) 2
  • novel dithiolene compounds like the known dithiolene compounds, are suitable for use in security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable barcodes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the curing and drying of print, the fixing of toners on paper, laser marking (plastics, paper, wood etc.) and the heating of plastics preforms etc.
  • novel dithiolene compounds of formulae I and Il are suitable for use as optical filters for plasma display panels (PDPs).
  • PDPs plasma display panels
  • 0.333 part of platinum dichloride is added to a solution of 0.541 part of the product from example 3a and 1.085 parts of Lawesson's reagent in 50 parts of toluene.
  • the reaction mixture is maintained at 1 10 0 C for 90 minutes and filtered while hot, and 500 parts of n- hexane are added to the filtrate after cooling.
  • the resulting precipitate is filtered off and dried, yielding 0.5 part of product (absorption maximum 994 nm).
  • Example 6a The compound from Example 2 is oxidised with atmospheric oxygen in dichloromethane at reflux temperature to form the corresponding oxo compound. Its absorption maximum is found at 968 nm.
  • Example 6a Preparation of
  • Example A1 (Security printing) 1 1.9 parts of vinyl chloride, 2.1 parts of vinyl acetate, 10 parts of ethoxypropanol, 75.5 parts of methyl ethyl ketone and 0.5 part of the product from Example 1 are shaken together with 150 g of glass beads for 30 minutes in a Skandex mixer.
  • the resulting printing ink is applied to contrast paper using a doctor blade (film thickness when damp: 6 ⁇ m).
  • the print is visually colorless, but is clearly visible in the IR range using an IR-viewing device (cut-off filter 715 nm).
  • the fastness to light is excellent.
  • Example A1 By proceeding as indicated in Example A1 but using the IR absorber from Example 2, there accordingly is likewise obtained a colorless print having excellent fastness to light, which is clearly visible in the infrared range using an IR-viewing device.
  • Example A3 (Laser-welding of plastics material) Using an injection-moulding machine, the IR absorber from Example 1 is incorporated into a polycarbonate disc having a thickness of 2 mm (concentration: 100 ppm). Using an Nd:YAG laser, the resulting, virtually colorless disc is welded at a power of 30 watt and a rate of advance of 20 mm/s to a second 1 mm-thick pure polycarbonate disc not containing IR absorber. The resulting weld is characterised by an excellent bond, unchanged transparency, no melt irruptions and no bubbling. Under heavy mechanical loading, breakage of the discs does not occur at the welded seam.
  • Example A4 (Laser-welding of plastics material) By proceeding as indicated in Example A3 but using the IR absorber from Example 2, a virtually colorless polycarbonate disc is likewise obtained which has excellent welding properties. The resulting weld has unchanged transparency, the welding leaves no melt irruptions or bubbling and the strength of the weld is excellent. Examples A5 and A6

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  • General Physics & Mathematics (AREA)
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  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Printing Methods (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Optical Filters (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to the use of compounds of formulae (I) and/or (II) as colorless IR absorbers wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, X1, X2 and X3 are each independently of the others sulfur or oxygen, R1, R2, R3, R4, R5 and R6 are each independently of the others hydrogen, NR7R8, unsubstituted or substituted C1-C18alkyl, C1-C18 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted C1-C18alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R7 and R8, each independently of the other, being unsubstituted or substituted C1-C18alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, a further IR absorber optionally being added to the compounds of formulae (I) and (II). The invention relates also to novel dithiolene compounds of formulae (I) and (II) wherein X1 is oxygen and X2 and X3 are oxygen or sulfur. The invention relates furthermore to novel dithiolene compounds of formulae (I) and (II) wherein R1 to R6 are NR7R8.

Description

DITHIOLENE METAL COMPLEX COLORLESS IR ABSORBERS
The invention relates to the use of specific dithiolene metal complexes as colorless IR absorbers. The invention relates also to novel dithiolene metal complexes.
Colorless, or at least barely colored, IR absorbers meet a significant technical need in a wide range of applications, such as security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the drying and curing of print, the fixing of toners on paper, optical filters for PDPs (plasma display panels), laser marking, the heating of plastics preforms etc.
Several classes of IR absorbers are known, such as, for example, quinone-diimmonium or aminium salts, polymethines (e.g. cyanines, squaraines, croconaines), phthalocyanines and naphthalocyanines, dithiolene and other metal complexes. Newer structures, such as, for example, quaterrylene diimides, have also recently become known.
Also known, besides those organic substances, are inorganic substances such as, for example, lanthanum hexaboride, indium tin oxide (ITO), antimony tin oxide (ATO) in nano- particulate form and coated mica materials ("Lazerflair" from Merck).
Notwithstanding that large number of known compound classes and structures, as yet no IR absorbers have become known that are satisfactory from the technical standpoint. Especially in respect of "colorlessness", that is, minimum inherent color, no truly satisfactory solutions are known that simultaneously meet the other technical stability requirements (heat stability and/or light stability). IR absorbers, for example for security printing, are available, for example, from "American Dye Source", but virtually all of them have an absorption in the VIS range of the spectrum (from 400 to 700 nm).
It has now been found, surprisingly, that a class of heterocyclic dithiolene metal complexes, known per se, is able to meet those requirements. Especially in respect of colorlessness, these compounds are appreciably superior to the known IR absorbers - while simultaneously meeting other technical requirements, such as, for example, good fastness to light (for security printing) or good heat stability when incorporated into plastics material (laser-welding of plastics). The invention accordingly relates to the use of compounds of formula I and/or Il as colorless IR absorbers
Figure imgf000003_0001
wherein M Is Ni1 Pd1 Pt1 AuJr1 Fe1 Zn1 W1 Cu1 MoJn1 Mn1 Co1 Mg1 V1 Cr Or Ti, Xi, X2 and X3 are each independently of the others sulfur or oxygen, Ri, R2, R3, R4, R5 and R6 are each independently of the others hydrogen, NR7R8, unsubstituted or substituted C-ι-C18alkyl, C1-C18 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted CrCi8alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R7 and R8, each independently of the other, being unsubstituted or substituted Ci-Ci8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, a further IR absorber optionally being added to the compounds of formulae I and II.
Preference is given to compounds of formula I wherein the metal M is Ni, Pd or Pt. (claim 2)
If the substituents Ri to R6 or R1 to R4 are Ci-Ci8alkyl radicals they are preferably unsubstituted Ci-Ci8alkyl radicals, more preferably Ci-C8alkyl radicals, including straight- chain and branched and also cyclic alkyl radicals. The following may be mentioned as examples: propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-hexyl, 2-ethylhexyl, n-octyl, cyclopentyl, cyclohexyl.
If the substituents Ri to R6 or R1 to R4 are d-C18alkyl radicals wherein the alkylene chain is interrupted with oxygen, they are preferably -(CH2)n-[O-(CH2)m]k-OCH3 with n = 2-6, m= 2 or 3, k = 1-6. If the substituents Ri to R6 or R1 to R4 are CrCi8alkenyl radicals they are preferably unsubstituted CrCi8alkenyl radicals, more preferably CrC6alkenyl radicals. Examples may be vinyl or allyl.
If the substituents Ri to R6 or R1 to R4 are aryl groups, they are preferably unsubstituted aryl groups, for example, phenyl, naphthyl, anthryl or phenanthryl groups.
If the substituents R1 to R6 or R1 to R4 are arylalkyl groups, they are preferably unsubstituted arylalkyl groups, for example, -(CH2)q-phenyl with q = 1-6, especially benzyl, ethylphenyl, propylphenyl.
If the substituents R1 to R6 or R1 to R4 are heteroarylalkyl radicals they are preferably unsubstituted heteroarylalkyl radicals which denotes that a heteroaromatic ring is bonded directly to an alkyl group. The heteroaromatic ring is, for example, imidazolyl, pyridyl, thienyl, furyl, thiazolyl, indolyl, quinolinyl, pyrazolyl, pyrazyl, pyridazyl or pyrimidinyl.
The substituents R1 to R6 or R1 to R4 are preferably unsubstituted CrC18alkyl, -(CH2)n-[O-(CH2)m]k-OCH3 with n = 2-6, m= 2 or 3, k = 1-6, unsubstituted CrC18alkenyl, unsubstituted arylalkyl or -N(CrC6alkyl)2.
The substituents R7 and R8 are preferably CrC6alkyl radicals.
In a preferred embodiment compounds of the formula I are used as colorless IR absorber wherein M is Ni, Pd, Pt,
Xi, X2 and X3 are each independently of the others sulfur or oxygen,
Ri, R2, R3, R4 are each independently of the others -N(CrC6alkyl)2, unsubstituted
Ci-C8alkyl, -(CH2)n-[O-(CH2)m]k-OCH3 with n = 2-6, m= 2 or 3, k = 1-6; vinyl or allyl,
-(CH2)q-phenyl with q = 1-6. (Claim 3)
Of particular interest are the structures Ia to Ih. - A -
Figure imgf000005_0001
Ia lb
Figure imgf000005_0002
Ic Id
Figure imgf000005_0003
Ih
(Claim 4)
Colorless IR absorbers can be used in all fields of application that depend on the IR absorber's remaining invisible. The following uses may be mentioned by way of example: security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the drying and curing of print, the fixing of toners on paper, laser marking (plastics materials, paper, wood etc.) and the heating of plastics preforms. (Claim 5)
An especially suitable field of application is the use of the compounds of formula I and/or Il in security printing and in the laser-welding of plastics material. (Claim 6) In another embodiment the compounds of formulae I and Il are used in security printing and printing of bar codes, (claim 7)
The IR absorbers of formulae I and Il can also be in the form of mixtures with further known IR absorbers, especially mixtures with polymethines (cyanines, squaraines and croconaines). Such IR absorber mixtures are suitable especially for security printing, (claim 8)
Examples of preferred polymethines are listed in the following Tables:
CYANINES
Figure imgf000006_0001
Figure imgf000007_0001
SQUARAINES
Figure imgf000007_0002
CROCONAINES
Figure imgf000007_0003
Figure imgf000008_0001
The IR absorbers are used in a concentration of from 10 ppm to 10 %, preferably 100 ppm to 2 % depending on the chosen application.
The laser welding is preferably carried out using an ND:YAG laser at 1064 nm or using a diode laser at 980 nm or 940 nm, and the concentration of IR absorber is, for example, from 5 to 500 ppm, preferably from 10 to 100 ppm.
In laser welding, plastics components are welded to one another. The dithiolenes according to the invention are suitable especially for welding transparent plastics materials, such as polypropylene, polyvinylbutyral, polyamide, polycarbonate, polycarbonate-polyethylene terephthalate blends, polycarbonate-polybutylene terephthalate blends, polycarbonate- acrylonitrile-styrene-acrylonitrile copolymer blends, polycarbonate-acrylonitrile-butadiene- styrene copolymer blends, polymethyl methacrylate-acrylonitrile-butadiene-styrene co- polymer blends (MABS), polyethylene terephthalate, polybutylene terephthalate, polymethyl methacrylate, polybutyl acrylate, polymethyl methacrylate-polyvinylidene difluoride blends, acrylonitrile-butadiene-styrene copolymers (ABS), styrene-acrylonitrile copolymers (SAN) and polyphenylene sulfone and also mixtures thereof.
Especially advantageous in welding is the use of two identically transparent plastics workpieces, for example colorless-transparent/colorless-transparent or colored-transparent/colored-transparent.
In security printing, the IR absorber is added to the printing ink. Suitable printing inks are water-based, oil-based or solvent-based printing inks, based on pigment or dye, for inkjet printing, flexographic printing, screen printing, intaglio printing, offset printing, laser printing or letterpress printing and for use in electrophotography.
The invention relates also to novel dithiolene compounds of formulae I and Il wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, Xi is oxygen and X2 and X3 are oxygen or sulfur,
Ri, R2, R3, R4, R5 and R6 are each independently of the others hydrogen, NR7R8, unsubstituted or substituted CrCi8alkyl, Ci-Ci8 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted Ci-Ci8alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R7 and R8, each independently of the other, being unsubstituted or substituted Ci-Ci8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl. (Claim 9)
Those compounds are obtained from the corresponding sulfur compounds (Xi, X2, X3 =S) by oxidation with a suitable solvent or as described by the examples.
The following compounds may be mentioned by way of example:
Figure imgf000009_0001
The invention relates also to novel dithiolene compounds of formulae I and Il wherein M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti, Xi, X2 and X3 are each independently of the others sulfur or oxygen, Ri, R2, R3, R4, R5 and R6 are NR7R8, wherein R7 and R8 are each independently of the other unsubstituted or substituted Ci-Ci8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl. (claim 10).
Preferably -NR7R8 is -N(Ci-C6alkyl)2
The following compounds Ic and Id may be mentioned by way of example:
Figure imgf000010_0001
Ic Id
The novel dithiolene compounds, like the known dithiolene compounds, are suitable for use in security printing (bank notes, credit cards, identity cards, passports etc.), invisible and IR readable barcodes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the curing and drying of print, the fixing of toners on paper, laser marking (plastics, paper, wood etc.) and the heating of plastics preforms etc.
Additionally, the novel dithiolene compounds of formulae I and Il are suitable for use as optical filters for plasma display panels (PDPs). For this application absorption below 1000 nm, especially around 900 nm, is of special interest.
Examples
Example 1 Preparation of
Figure imgf000010_0002
The compound is known from J. Chem. Soc, Dalton Trans 1998, 3731-3736, and its preparation is described therein. 1 ,3-Diisopropyl-4,5-dioxo-imidazoline-2-thione is reacted under reflux conditions with metallic
nickel and Lawesson's reagent 'n chlorobenzene.
Figure imgf000011_0001
Absorption maximum (chloroform): 1001 nm (79 000)
Example 2 Preparation of
Figure imgf000011_0002
Reaction is carried out analogously to Example 1 , with platinum dichloride and Lawesson's reagent. Absorption maximum (chloroform): 1000 nm (113 000).
Example 3a Preparation of
Figure imgf000011_0003
12.26 parts of N,N-dimethylhydrazine are added at room temperature, with stirring, to a solution of 7.65 parts of carbon disulfide in 250 parts of dichloroethane. The temperature is then increased to 400C and stirring is carried out for 16 hours at that temperature to complete the reaction. The temperature is subsequently increased to 800C for one hour. A further 750 parts of dichloroethane are then added, and 13.88 parts of oxalyl chloride (dissolved in a small amount of dichloroethane) are added dropwise over a period of 90 minutes. The reaction mixture is then heated to reflux and maintained at reflux for 2 hours, after which it is concentrated and the yellow crystals are filtered off and washed with a small amount of dichloroethane. After drying, 14 parts of product having the structure indicated above are obtained. Example 3b Preparation of
Figure imgf000012_0001
0.333 part of platinum dichloride is added to a solution of 0.541 part of the product from example 3a and 1.085 parts of Lawesson's reagent in 50 parts of toluene. The reaction mixture is maintained at 1 100C for 90 minutes and filtered while hot, and 500 parts of n- hexane are added to the filtrate after cooling. The resulting precipitate is filtered off and dried, yielding 0.5 part of product (absorption maximum 994 nm).
Example 4
The procedure is analogous to that in the previous examples, except that the metal used is molybdenum, thus yielding the corresponding 1 :3 molybdenum complex:
Figure imgf000012_0002
Example 5 Preparation of
Figure imgf000012_0003
The compound from Example 2 is oxidised with atmospheric oxygen in dichloromethane at reflux temperature to form the corresponding oxo compound. Its absorption maximum is found at 968 nm. Example 6a Preparation of
Figure imgf000013_0001
29.14 parts of 1 ,3-di-n-propyl-urea are dissolved in 300 parts of toluene at 40 0C. Over a period of 40 minutes 27.18 parts of oxalyl chloride are added at 80 0C to the stirred solution. After a further hour of stirring at 100 0C the solution is evaporated at 60 0C to dryness: 36.8 parts of the product are obtained.
Example 6b Preparation of
Figure imgf000013_0002
1.59 parts of the product from Example 6a, 1.06 parts of platinum dichloride and 3.47 parts of Lawesson's reagent are heated to 1 10 °C under nitrogen in 100 parts of toluene. After 45 minutes reaction time the dark solution is cooled down to -100C and the precipitation is filtered off, washed with ethanol and some acetone. For purification the crude product is dissolved in dichloromethane and precipitated slowly by addition of methanol. Dark blue crystals are collected by filtration. The absorption maximum of the product is found at 900 nm (chloroform). Example 7 Preparation of
N N
O O
N"^S S N
Proceeding analogously to Example 6b but using palladium chloride instead of platinum chloride the corresponding palladium complex with an absorption maximum of 921 nm is obtained.
Example 8 Preparation of
Figure imgf000014_0001
Proceeding analogously to Example 6b but using metallic nickel instead of platinum chloride the corresponding nickel complex with an absorption maximum of 891 nm is obtained.
Example 9 to 24
Compounds of Examples 9 to 24 (structures given in the table below) are obtained by analogous procedures as described in Examples 1 to 8:
Figure imgf000015_0001
Figure imgf000016_0001
Application Examples
Example A1 (Security printing) 1 1.9 parts of vinyl chloride, 2.1 parts of vinyl acetate, 10 parts of ethoxypropanol, 75.5 parts of methyl ethyl ketone and 0.5 part of the product from Example 1 are shaken together with 150 g of glass beads for 30 minutes in a Skandex mixer.
The resulting printing ink is applied to contrast paper using a doctor blade (film thickness when damp: 6 μm). The print is visually colorless, but is clearly visible in the IR range using an IR-viewing device (cut-off filter 715 nm). The fastness to light is excellent.
Example A2 (security printing)
By proceeding as indicated in Example A1 but using the IR absorber from Example 2, there accordingly is likewise obtained a colorless print having excellent fastness to light, which is clearly visible in the infrared range using an IR-viewing device.
Example A3 (Laser-welding of plastics material) Using an injection-moulding machine, the IR absorber from Example 1 is incorporated into a polycarbonate disc having a thickness of 2 mm (concentration: 100 ppm). Using an Nd:YAG laser, the resulting, virtually colorless disc is welded at a power of 30 watt and a rate of advance of 20 mm/s to a second 1 mm-thick pure polycarbonate disc not containing IR absorber. The resulting weld is characterised by an excellent bond, unchanged transparency, no melt irruptions and no bubbling. Under heavy mechanical loading, breakage of the discs does not occur at the welded seam.
Example A4 (Laser-welding of plastics material) By proceeding as indicated in Example A3 but using the IR absorber from Example 2, a virtually colorless polycarbonate disc is likewise obtained which has excellent welding properties. The resulting weld has unchanged transparency, the welding leaves no melt irruptions or bubbling and the strength of the weld is excellent. Examples A5 and A6
By proceeding as indicated in Examples A3 and A4 but, instead of using an Nd:YAG laser (1064 nm), using a diode laser having an emission wavelength of 980 nm, similarly good results to those described in Examples A3 and A4 are obtained.
Examples A7 and A8
By proceeding as indicated in Examples A3 and A4 but, instead of using an Nd:YAG laser (1064 nm), using a diode laser having an emission wavelength of 940 nm, a comparably good weld is obtained at a laser power of 80 watt.
Example A9
By proceeding as indicated in Example A3, but using polypropylene discs having a thickness of 1.5 mm, the welds obtained are likewise very good.

Claims

Claims:
1. Use of compounds of formulae I and/or Il as colorless IR absorbers
wherein
M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti,
Xi, X2 and X3 are each independently of the others sulfur or oxygen,
Ri, R2, R3, R4, R5 and R6 are each independently of the others hydrogen, NR7R8, unsubstituted or substituted CrCi8alkyl, Ci-Ci8 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted CrCi8alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R7 and R8, each independently of the other, being unsubstituted or substituted Ci-Ci8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, a further IR absorber optionally being added to the compounds of formulae I and II.
2. Use of compounds of the formula I according to claim 1 wherein M is Ni, Pd or Pt as colorless IR absorbers.
3. Use of compounds of the formula I according to claim 1 as colorless IR absorber wherein
M is Ni, Pd, Pt, Xi, X2 and X3 are each independently of the others sulfur or oxygen,
Ri, R2, R3, R4 are each independently of the others -N(Ci-C6alkyl)2, unsubstituted Ci-C8alkyl, -(CH2)n-[O-(CH2)m]k-OCH3 with n = 2-6, m= 2 or 3, k = 1-6; vinyl or allyl, -(CH2)q-phenyl with q = 1-6.
4. Use of a compound of formula Ia, Ib, Ic, Id, Ie, If, Ig or Ih according to claim 1 as colorless IR absorbers.
Figure imgf000020_0001
Ia Ib
Figure imgf000020_0002
Ic Id
Figure imgf000020_0003
Ih
5. Use of compounds of formulae I and Il according to any one of claims 1-4 for security printing, invisible and IR readable bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, the drying and curing of print, the fixing of toners on paper, laser marking and the heating of plastics preforms.
6. Use of compounds of formulae I and Il according to claim 5 for the laser-welding of plasties materials.
7. Use of compounds of formulae I and Il according to claim 5 in security printing and printing of bar codes.
8. Use of compounds of formulae I and Il according to claim 1 in admixture with further IR absorbers from the group of the polymethines.
9. Compounds of formulae I and/or Il
Figure imgf000021_0001
wherein
M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti,
Xi is oxygen,
X2 and X3 are each independently of the other sulfur or oxygen,
Ri, R2, R3, R4, R5 and R6 are each independently of the others hydrogen, NR7R8, unsubstituted or substituted CrCi8alkyl, Ci-Ci8 alkyl wherein the alkylene chain is interrupted with oxygen, unsubstituted or substituted Ci-Ci8alkenyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl, R7 and R8, each independently of the other, being unsubstituted or substituted Ci-Ci8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl.
10. Compounds of formulae I and/or
Figure imgf000022_0001
wherein
M is Ni, Pd, Pt, Au, Ir, Fe, Zn, W, Cu, Mo, In, Mn, Co, Mg, V, Cr or Ti,
Xi, X2 and X3 are each independently of the others sulfur or oxygen,
Ri, R2, R3, R4, R5 and R6 are NR7R8, wherein R7 and R8 are each independently of the other unsubstituted or substituted CrCi8alkyl, unsubstituted or substituted aryl, unsubstituted or substituted arylalkyl or unsubstituted or substituted heteroarylalkyl.
1 1. Use of compounds according to claims 9 and 10 for security printing, bar codes, the laser-welding of plastics, the curing of surface-coatings using IR radiators, drying and curing of print, the fixing of toners on paper or plastics, laser marking of plastics, paper and other natural or synthetic materials and the heating of plastics performs and also for optical filters for plasma display panels (PDPs).
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