Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
  • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/18—Fireproof paints including high temperature resistant paints
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J1/00—Adhesives based on inorganic constituents
  • C09J1/02—Adhesives based on inorganic constituents containing water-soluble alkali silicates
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
  • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
  • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
  • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F23/00—Advertising on or in specific articles, e.g. ashtrays, letter-boxes
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
  • G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F3/0297—Forms or constructions including a machine-readable marking, e.g. a bar code
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
  • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/023—Adhesive
  • G09F2003/0232—Resistance to heat
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/023—Adhesive
  • G09F2003/0239—Permanent adhesive

Definitions

• the present invention relates to an improved marker system providing unique identification for use in the security and tracing of items and particularly engines, engine parts, exhaust systems and/or catalytic converters.
• non-ferrous metals are expensive materials and their price is steadily increasing. As a result theft of such metal items is on the incline. Accordingly, the theft of such metal items is particularly costly for the party suffering the loss, not only due to the high value of the materials involved but the ensuing loss due to disruption of business and infrastructure can be orders of magnitude higher.
• Some metals are used in the construction of items which have high operating temperatures such as engines, engine parts, exhaust systems and catalytic converters. These systems can contain a mixture of ferrous and non-ferrous metals as well as rare earths such as rhodium, iridium, palladium and platinum. The high price of metals generally and the rare earths in particular has resulted in theft of items in which they are used. It appears that anything containing metal is considered valuable enough to warrant the attention of thieves.
• marker systems have been particularly useful in preventing crime and for tracking and identifying the authenticity of items.
• Such marker systems have found particular application in the fields of security and crime prevention/deterrence, for example as described in WO 93/07233, GB 2369078, GB 2410208 and GB 2413675, amongst others.
• Analysis of the surface onto which the marker system is placed or deployed can provide a reliable method of tracing or authenticating items, articles, goods, vehicles or persons.
• the marker system is used for tracking and/or identifying engines, engine parts, exhaust systems and/or catalytic converters.
• These items not only require that the marker can withstand high temperatures, but they require the marker to be able to cope with large temperature differentials; i.e. cold to hot in a matter of minutes when for example the vehicle is turned on and the reverse when the engine is turned off.
• these items generally contain toxic byproducts as well as flammable and corrosive substances, the marker system must be able to withstand exposure to these elements. Therefore, there is a need for a robust marker system capable of withstanding high temperatures and large temperature fluctuations for extended periods of time so that marker and consequently the goods remain identifiable.
• a covert marker system for applying to surfaces that operate at high temperature.
• Suitable surfaces include surfaces such as engines, engine parts, exhaust systems and/or catalytic converters; however, any surface which is capable of receiving a marker and which operates at high operating temperatures is applicable in this context.
• said marker system comprising a marker and a temperature resilient medium capable of securing the marker system onto a surface with a high operating temperature; wherein the medium contains an soluble inorganic matrix to secure the marker to a surface, wherein the marker comprises a fingerprint to render the marker unique, and wherein the marker system further comprises an indicator material to indicate the presence of the marker.
• the medium may be applied as an aqueous solution and may be left to air dry or may be heated to dry quickly.
• the silicate can be chosen so that it forms a cohesive layer which at this point forms a stable surface coating on the substrate upon drying at room temperature. As the temperature of the substrate increases the silicate then cross links to form a glass like structure which is capable of withstanding the high temperatures involved.
• the present invention provides a marker system that is stable to high
• the marker system comprises:
• the matrix comprises a silicate and which may be water soluble, such as for example potassium silicate.
• a silicate may be water soluble, such as for example potassium silicate.
• This embodiment provides the advantage of not requiring very high temperature to melt the glass particles to form the adhesive protective layer.
• Such an adhesive protective layer may be formed upon drying the applied layer at room temperature or slightly elevated temperature of around 100 ° C.
• the use of the silicate offers advantages over, for example, glass powders as the product is a homogenous solution and requires no stirring or shaking to redistribute the glass particles. Furthermore, as it is a solution, a more consistent and uniform surface coating can be applied as there is no settlement during application to an item.
• the marker system does not require any heating to form the heat resistant layer; it can be left to air dry. Glass powders require heating to fuse the glass into one cohesive layer to provide the heat resistant covering so will only fuse when first used at high temperature. Prior to application of the heat in use, the marker could simply be wiped off the item. This is of particular importance when the marker system is for application to items which are to be held in storage before use, for example, catalytic converters which are marked in a warehouse or other such facility prior to fitting.
• the marker comprises a fingerprint and which is preferably an organometallic fingerprint.
• the marker further comprises an indicator which may, for example, be an inorganic indicator.
• the indicator comprises at least one phosphorescent or fluorescent material capable of phosphorescing or fluorescing at particular wavelengths when subjected to a particular stimulus.
• the indicator comprises at least one material capable of phosphorescing or fluorescing when subjected to an infrared or ultraviolet stimulus.
• the matrix is such that it is capable of preserving the integrity of the markers at high temperatures, preferably between 100 ° C to 450 ° C.
• the marker system is provided in a sprayable form.
• An engine, an engine part, an exhaust system and/or a catalytic converter comprising a surface coated or otherwise impregnated with the marker system also forms part of the present invention.
• the use of the marker system described herein on the surface of an engine, an engine part, an exhaust system and/or a catalytic converter requires a marker system which maintains its structural integrity when exposed to highly toxic, flammable and/or corrosive substances as well as extreme temperatures/temperature flutuations in order to be able to carry out its function as an identifier of the proprietor of the vehicle. It has been identified by the inventor that the claimed marker is able to maintain its structural integrity under these extreme conditions over long periods of time.
• a method for marking an engine or a part thereof, an exhaust system and/or a catalytic converter comprising: applying the marker system as described herein to the surface of an engine or a part thereof, an exhaust system and/or a catalytic converter.
• the adhesive protective layer is formed by drying the layer at room temperature.
• the adhesive protective layer is formed by drying the layer at temperatures around 100 ° C.
• a method of identifying an engine or a part thereof, an exhaust system and/or a catalytic converter comprising a marker system as described herein comprising: using a digital camera to measure the marker system under UV and/or IR radiation; recording the measurements defining the marker system from the surface of the engine or part thereof, the exhaust system and/or the catalytic converter; and comparing the recorded measurements with a database comprising details of all measurements.
• the method further comprises the step of aligning the digital camera in respect of the marker system.
• the digital camera comprises an alignment mechanism allowing the camera to be correctly aligned to the marker system.
• the digital camera is aligned to the marker system by aligning one or more marks on the surface of the engine, the engine part, the exhaust system and/or the catalytic converter with one or more marks on the digital camera.
• Figure 1 shows the analytical results from a 13 component fingerprint after a 4 month period at a constant 450°C in a soluble potassium silicate matrix. After this extended period of constant high temperature all components are still present at a level significantly higher than the background noise which is typically 1% of the maximum peak height and is too low to measure on the scale used.
• Figure 1 is a mass spectrum analysis showing the elements present labelled as components and with increasing atomic weight from left to right. The Y axis is the intensity of the spectrum and shows the amount of material present during the analysis.
• Matrix The marker system is held in place by a matrix.
• the present invention uses a soluble silicate as the matrix. This offers several improvements over previous matrices which require the use of both organic and inorganic entities.
• Previous matrices required the use of an organic medium to form a cohesive film at room temperature to hold a low melting point glass powder in place.
• the glass powder then melts as the temperature increases forming a high temperature resistant film.
• the organic medium burns off leaving just the glass in place
• the present invention uses a soluble silicate.
• a potassium silicate is used as the matrix. This forms a film at room temperature and means that an organic medium is not required.
• the soluble silicate has been found to be an improvement over systems which use glass powders in that as the silicate is water soluble it forms a homogeneous layer when applied to the surface of the object being marked.
• a soluble silicate is advantageous over systems which use glass powders in that there is no need to ensure uniform distribution of the powder by continually agitating the mixture during application.
• this agitation is not completely effective, i.e. the powder is not uniformly distributed, then the matrix formed may be of varying thickness and strength.
• This problem has been found to be overcome by using a soluble silicate.
• systems which use two different matrices have been found to cause difficulties in that the inorganic matrix has to cross link to form a cohesive layer before the organic material burns off. Therefore, in these systems, there is a critical relationship between the polymer thermal stability and the cross-linking of the glass powder which is difficult to control. It has been found that the use of a soluble silicate negates this issue.
• the matrix of the present invention is applied to a substrate which is the surface of a device that is hot when in use.
• the marker is applied when the substrate is at room temperature so that the silicate matrix air dries to form a layer with no additional heating required.
• the substrate to which the marker has been applied will increase in temperature at a rate which is variable depending upon the actual device and the conditions of use.
• One advantage of the present invention is that the soluble silicate is not affected by the rate of heating and will crosslink to form a glass as the temperature increases.
• the marker detailed above may further comprise a fingerprint and/or an indicator. It is preferable that each of the components of the marker is also capable of withstanding or are resilient to high temperatures; between 100 ° C to 450 ° C.
• the marker preferably comprises a unique fingerprint capable of distinguishing one marker system from that of another and to identify the substrate such as engine, exhaust system and/or catalytic converter to which it is applied.
• the fingerprint therefore imparts unique characteristics to each marker and the surface to which it has been applied.
• the fingerprint may comprise a solvent medium containing a volatile
• trace materials which can be varied in such a manner as to produce unique formulations.
• the combinations of trace materials may advantageously be varied by modelling the compositions on, for example, binary strings to produce large numbers of unique products.
• Other suitable coding methodologies may also be utilised as appropriate.
• trace materials applies herein to materials which would not normally be present in the environment of use. The most commonly used trace materials are metal compounds.
• Trace materials can advantageously, therefore, be combined in a way which provides excellent evidential value to law enforcement agencies, as each unique formulation may be allocated to a particular premises, location or person, and this information is stored in a central database which could advantageously be accessed by a law enforcement agency, for example.
• the trace materials may be assigned constant positions in a binary string with their presence being given by a "1", and their absence by a "0". If, for example, one were to set a limit of thirty digits for the string, one could begin with combinations of two trace materials, and generate all combinations containing any two trace materials. One could then go to groups of three trace materials, and generate all combinations of any three trace materials. This could continue until the number of trace materials is equal to the number of digits in the string. With a thirty digit string, the total number of unique combinations of trace materials is approximately one billion. However, it is possible to prepare an infinite number of mixtures having compositions based upon unique binary sequences, the composition of each being unique. Binary strings are provided as exemplary of the manufacturing procedures which can be used.
• Octal strings may also be used.
• Decimal numbers and random number generation can be used to generate potential codes, although these will need to be checked and converted to binary or octal sequences prior to use.
• the unique nature of each composition can be checked during Quality Control following manufacture.
• the composition can then be stored in a database, allocated to an engine or part thereof, an exhaust system and/or a catalytic converter, and the source of the engine, engine part, exhaust system and/or catalytic converters located at a later time can be traced to the premises, location or person via the composition.
• inorganic materials may be used as the fingerprint.
• a preferred fingerprint for use in the invention is an organometallic material.
• these compounds yielded the best results as they were initially easy to work with and when subjected to high temperature, the organic burnt off leaving the metals as fingerprint.
• Such materials were tested in a furnace at 450°C weekly over a period of 4 months. Analysis of the fingerprint after this time showed the fingerprint to be intact and complete with little variation in both the overall level of materials present and in the relative amounts of each.
• Figure 1 shows the analytical results from a 13 component fingerprint after a 4 month period at a constant 450°C in a soluble potassium silicate matrix. After this extended period of constant high temperature all components are still present at a level significantly higher than the background noise which is typically 1% of the maximum peak height and is too low to measure on the scale used.
• Figure 1 is a mass spectrum analysis showing the elements present labelled as components and with increasing atomic weight from left to right. The Y axis is the intensity of the spectrum and shows the amount of material present during the analysis.
• the marker preferably comprises an indicator material, which can quickly provide a preliminary, gross indication of the presence of a composition according to the invention.
• the indicator material can either be "overt” or "covert.”
• An overt material is typically one which can be seen unaided by technology, such as a dye or pigment. With an overt indicator, it is immediately evident from an observation of the article or person that a mark has been provide thereon which may act as a deterrent. In one embodiment both a covert and overt mark may be applied thus combining the deterrent effect of the overt mark with the covert properties of the covert mark.
• covert indicator will remain hidden until some technical means or stimulus is used to make it obvious.
• a covert indicator will become visible upon application of a radiation source other than visible light, and of these, fluorescent indicators are most common.
• the covert indicator will often be at least one fluorescent material which is soluble in a solvent system, and which is easily detectable upon examination with ultraviolet light, for example.
• the indicator may comprise at least one phosphorescent material capable of phosphorescing when subjected to stimulus.
• the indicator is preferably utilised in spray form and can be combined with various solvent systems and surfactants.
• the indicator is suitably present in an amount of 0.1 to 40% by weight of the composition.
• the composition can include one or more of any suitable fluorescent materials.
• suitable indicators both organic and inorganic materials were tested. Some organics, especially of the oxazinone functionality may be used.
• an inorganic emitter a preferred compound for use in the invention as an indicator.
• a range of inorganic emitters were tested and some of these maintained a good fluorescent emission for temperatures between room temperature to 450 ° C.
• Various indicators were found to have the necessary thermal stability and to not lose their fluorescence over a period of 4 months at 450°C. These were all inorganic in nature and several are available, the final choice will depend on the required colour of the fluorescence. Examples of such are:
• Invisible Blue E which emits blue under 365nm UV light
• this marker system may be applied to an article.
• the marker system is colourless, odourless and has no feel thereto, and is therefore undetectable.
• Example 1 Testing of the organic medium/inorganic matrix The present invention provides a marker system that is stable to high
• the observed degradation showed either a charring/blackening of the surface coating, or the complete loss of the coating from the surface to which it had been applied.
• Both a bead of ⁇ 3cm in diameter of sealant was applied to the metal surface and a bead which was spread to form a thin film coating the metal surface were tested.
• the thin smear of silicone was achieved by smoothing the bead using a wet gloved finger. Observation showed that the silicone does adhere to the metal surfaces, but can be easily removed especially when a thick bead is applied. After drying overnight, the thicker silicone bead is clearly visible and easy to remove as it simply peels away. The thinner silicone smear is less visible but can still be very easily removed by peeling or rubbing.
• This material was tested at various concentrations in water. It was tested at both the air dried stage and after exposure to higher temperature.
• the surface coatings were allowed to dry at room temperature and then they were heated up to 450°C. They were then removed from the heat source at daily intervals and tested.
• the strength of the film forming the surface coating had increased significantly over the room temperature dried material and had good resistance to abrasion. It was found that this resistance did not increase in subsequent days beyond the first.
• the strength of the bond to the substrate did increase with concentration of the silicate in water. The most concentrated solution, i.e. 70% wt/wt, gave the strongest and thickest layer.
• This material based upon concentrations of 30%wt/wt, 40%wt/wt, 50%wt/wt and 60%wt/wt potassium silicate in water was then tested and sampled periodically over a period of several months at a temperature of 450°C. No change or deterioration in the surface coating was noted over this period and it remained a colourless, clear intact surface coating on the substrates tested.
• the substrates tested were cast iron, stainless steel and porcelain.
• the 60%wt/wt solutions gave a surface coating with thickest film, whereas the 30%wt/wt gave the most transparent layer. The choice of concentration depends upon the actual requirements of the surface coating.
• Example 2 Testing of the Indicator Various indicators were tested including DNA based systems and systems based upon other organic moieties and silicone based products. However none of these had the required stability under the conditions described above.
• an indicator In order for the position of a covert marker to be identified an indicator is also required.
• Various types of indicator are available which emit visible radiation in response to different forms of stimulation Ultra violet (UV) emission at 365 nm was used and infra-red (IR) radiation at 980nm.
• UV Ultra violet
• IR infra-red
• organic and inorganic indicators were tested, but none of the organic materials had the necessary stability. Not all the inorganic materials tested had the required stability, although some did. Of these materials responding to UV are by far the brighter due to Stokes emission rather than the anti-Stokes obtained from those responding to IR.
• UV activated materials a wide range of emitted colours are available and the choice to be made is largely cosmetic. Testing of these materials at 450 ° C over a period of 4 months showed no loss of emission intensity over this period of time. All the materials stable under these conditions were inorganic and the choice will be determined by the colour of the fluorescence that is required. Such materials can be made to fluoresce in various colours for example yellow and red under long wave UV and are generally based upon an inorganic metal oxide with a dopant to give the required colour.
• Example 3 Testing of the Fingerprint Extended stability tests of metal based fingerprints showed them to have the required stability when used in the medium described above. Repeated weekly analysis of fingerprints held continuously at 450 ° C showed no decrease in the fingerprint level over a period of 4 months. These results are confirmed by the analytical results shown above.

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• Materials Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Inorganic Chemistry (AREA)
• Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
• Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)

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• 2012
  • 2012-09-28 GB GB1217399.3A patent/GB2506413A/en not_active Withdrawn
• 2013
  • 2013-09-27 WO PCT/EP2013/070300 patent/WO2014049164A1/en active Application Filing
  • 2013-09-27 EP EP13776437.9A patent/EP2901441A1/de not_active Withdrawn
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