WO2006079599A1 - Materiau polymere transparent utilise pour l'enregistrement d'empreintes digitales - Google Patents

Materiau polymere transparent utilise pour l'enregistrement d'empreintes digitales Download PDF

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Publication number
WO2006079599A1
WO2006079599A1 PCT/EP2006/050290 EP2006050290W WO2006079599A1 WO 2006079599 A1 WO2006079599 A1 WO 2006079599A1 EP 2006050290 W EP2006050290 W EP 2006050290W WO 2006079599 A1 WO2006079599 A1 WO 2006079599A1
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WO
WIPO (PCT)
Prior art keywords
mass
clear
polymers
kit
fingerprint
Prior art date
Application number
PCT/EP2006/050290
Other languages
English (en)
Inventor
Dierk Luebbers
Stephan Lampl
Ralf Kollefrath
Original Assignee
Coltene Ag
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
Priority claimed from EP05100540.3A external-priority patent/EP1693420B1/fr
Application filed by Coltene Ag filed Critical Coltene Ag
Publication of WO2006079599A1 publication Critical patent/WO2006079599A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes

Definitions

  • the present invention is related to clear silicone materials and the use thereof for the registration of fingerprints .
  • Fingerprints are a characteristic feature of an individual person . It is considered as strong evidence if the fingerprints found at a location where a crime had occurred coincide with the fingerprints of a person suspected to have performed the crime .
  • fingerprints are detected and collected by first applying a powder such as carbon black or aluminum on the surface of an obj ect to be investigated. By sweeping the surface with a brush it is achieved that the powder adheres to latent fingerprints , if there are any .
  • the fingerprints thus made visible (developed) can be lifted by using adhesive tapes .
  • This obj ect has been solved by a clear silicone mass , a process of collecting fingerprints by using a clear polymeric mass , and by the use of said clear polymeric mass for collecting fingerprints .
  • the present invention is based on the surprising finding that it is possible to collect a fingerprint by using a clear polymeric mass , and to obtain the positive fingerprint by taking a photograph of the collected (negative) fingerprint through said clear polymeric mass from the upper side, i . e . from the side remote from the fingerprint impression .
  • the present invention is particularly related to a clear crosslinkable polymeric mass selected from the group consisting of silicone polymers , polyurethane polymers , polyether polymers , polyacrylates , styrene-butadiene-copolymers , and methyl meth- acrylate copolymers , wherein said mass has a viscosity of from 0.1 to 200 Pas and a tensile strength of from 0.1 to 5 MPa .
  • the polymer prefferably has an appropriate viscosity, preferably in the above-defined range . Otherwise it is not possible to obtain an adequate impression of a fingerprint by applying said polymeric mass onto the developed fingerprint .
  • the mass would be either to fluent and flow over the surface without taking up the fingerprint impression, or it would be too viscous already before curing and thus also not capable of taking up the fingerprint impression .
  • the polymeric mass to be used has a viscosity in the range of from 0.1 to 200 Pas , especially preferred from 1 to 50 Pas .
  • the polymeric mass must result in a cured layer which allows the taking of a photography through the layer .
  • the mass must be clear .
  • the term clear means that the cured layer is sufficiently transparent that a photograph showing the details of the fingerprint impression contained in said layer can be taken through said layer .
  • it must be possible to obtain from the polymeric mass a cured layer having a thickness not exceeding 5 mm. Since with increasing thickness the brilliance of the photography taken through said layer decreases as well as the danger of inclusions of air increases , it is preferred to have a thickness of the cured layer which does not exceed 1 mm, preferably not exceed 0.5 mm and most preferably is less than 0.4 mm.
  • the polymeric mass has to possess an appropriate tensile strength, preferably a tensile strength of at least 0.1 MPa, preferably of more than 1 MPa, and most preferably of 1.5 MPa .
  • the polymeric mass which can be used according to the present invention is further limited by the requirement that a clear cured layer has to be obtained, in order to allow the taking of cramps through said layer .
  • the clear mass may be either a crosslinkable silicone polymer, a crosslinkable polyurethane polymer, a crosslinkable polyether polymer, a crosslinkable polyacrylate, a crosslinkable styrene-butadiene-copolymer, or a methyl methacrylate copolymer .
  • crosslinkable in this respect means that the polymer must comprise functional groups which can react with a crosslinking agent .
  • the crosslinking agent can link two or more of the polymer chains , resulting in a three-dimensional network .
  • a cured layer is obtained from the polymeric mass .
  • Silicone polymers are from a chemical standpoint polysiloxanes having the general formula
  • R 1 and R 2 being organic residues equal or different from each other, preferably a Ci-I 0 alkyl group, and X und Y being terminal groups .
  • R 1 and R 2 may also comprise functional groups , preferably vinyl groups , n can be an integer from 1 to 10000.
  • linear silicone polymers comprising terminal groups X and Y at least one of which comprising a functional group capable of reacting with a crosslinking agent . It is preferable to use a silicone polymer which can be either addition-crosslinked or condensation-crosslinked.
  • addition-crosslinked or “addition-crosslinkable” means that the polymer comprises at least one functional group which may react with a crosslinking agent via an addition reaction .
  • a typical example is that the polymer comprises at least one double bond, preferably two double bonds , which may undergo an electrophilic addition reaction with an appropriate crosslinking agent .
  • a preferred embodiment according to the present invention is a silicone polymer which comprises terminal groups X and Y possessing double bonds , for example vinyl groups .
  • An example is the commercial product Silopren Ul , a vinyl-terminated polydimethylsiloxane sold by GE Bayer Silicones .
  • condensation-crosslinked or “condensation- crosslinkable” means that the polymer comprises at least one functional group which may react with a crosslinking agent via a condensation reaction .
  • the polymer comprises at least one hydroxyl group, preferably two hydroxyl groups , which may undergo a condensation reaction with an appropriate crosslinking agent, for example a crosslinking agent comprising alkoxy silicates .
  • a preferred embodiment according to the present invention is a silicone polymer which comprises as terminal groups X and/or Y hydroxyl groups .
  • An example is the commercial product Silopren C2 , a hydroxy-terminated polydimethylsiloxane sold by GE Bayer Silicones .
  • the molecular weight of the silicone polymer is chosen such that the required viscosity and tensile strength are obtained.
  • additives such as rheology modifiers may be added for adjustment of said parameters .
  • Polyurethanes are polymers which are obtainable by reaction of a polyisocyanate, preferably a diisocyanate, with a polyol, such as a polyether polyol or polyester polyol .
  • a polyol such as a polyether polyol or polyester polyol.
  • Polyethers are polymers comprising ether groups in their repeating unit .
  • Polyether prepolymers may be obtained, for example, from epoxides .
  • functional groups which render the polymer crosslinkable e . g . aziridine groups
  • the above statements with respect to silicone polymers equally apply .
  • Polyacrylates are polymers which are obtained by polymerization of acrylate monomers , such as methyl methacrylates (MMA) .
  • MMA methyl methacrylates
  • Styrene-butadiene-copolymers may be obtained by copolymerization of these monomers .
  • functional groups which render the polymer crosslinkable as well as to the molecular weight of the polymer, the above statements with respect to silicone polymers equally apply .
  • Methyl methacrylates-copolymers may be obtained by co-polymerizing methyl methacrylates with a suitable monomer .
  • functional groups which render the polymer crosslinkable as well as to the molecular weight of the polymer, the above statements with respect to silicone polymers equally apply .
  • the above polymers may be additionally mixed with conventional additives , such as rheology modifiers , fillers etc . , which are well-known to the skilled man and used for adjusting the properties of the polymers .
  • additives are highly- dispersed silica, paraffin oil, surfactants , fillers , and pre- polymeric resins such as silicone resins .
  • the above polymeric mass is used according to the present invention with an appropriate crosslinker capable of reacting with the polymer .
  • the reaction between the polymer and the cross- linker causes the curing of the layer applied onto the developed fingerprint .
  • the nature of the crosslinker to be used depends upon the kind of polymer, i . e . which functional groups are present in the polymer .
  • an appropriate crosslinker is a reagent capable of reacting with said polymer via an addition reaction .
  • the polymeric mass is the commercial product Silopren Ul , a vinyl-terminated polydimethylsiloxane sold by GE Bayer Silicones .
  • This polymer may be used, for example, together with the commercially available crosslinking agent Silopren U crosslinker 430 sold by GE Bayer Silicones , which is a polydi- methyl hydrogen methyl siloxane comprising Si-H bonds . Said Si-H bonds may react with the vinyl groups in the Silopren Ul .
  • an appropriate crosslinker is a reagent capable of reacting with said polymer via a condensation reaction .
  • the polymeric mass is the commercial product Silopren C2 , a hy- droxy-terminated polydimethylsiloxane sold by GE Bayer Silicones .
  • This polymer may be used, for example, together with the commercially available crosslinking agent Silopren C crosslinker 25 sold by GE Bayer Silicones , which is a mixture of alkoxy silicates and organotin compounds .
  • the reaction between the polymer and the crosslinking agent is typically accelerated by the use of a catalyst .
  • Catalysts for the respective reactions are well-known .
  • a suitable catalyst is the Silopren catalyst Pt/D sold by GE Bayer Silicones , which is a platinum complex in divinyl polymethylsiloxane .
  • the present invention is also related to a kit for the registration of fingerprints , comprising a clear polymer, preferably as described above, and a suitable crosslinking agent .
  • the kit may comprise a suitable catalyst .
  • the kit may optionally comprise a developing agent .
  • the kit may be one-component or two-component kit .
  • a one-component kit is a system where the polymeric mass and the crosslinker are stored together in e . g . the same compartment, but will only undergo the crosslinking reaction after being released and brought in contact with air hu- midity .
  • a two-component kit is a kit where the polymeric mass and the crosslinker are stored separately, e . g . in different compartments .
  • the polymer may also be present dissolved in a suitable solvent .
  • the kit comprises Silopren Ul as polymeric mass , Silopren U Crosslinker as suitable crosslinker capable of undergoing an addition reaction with Silopren Ul , and Silopren U catalyst as a suitable catalyst,
  • the kit comprises Silopren C2 as polymeric mass , and Silopren U Crosslinker 25 as suitable crosslinker capable of undergoing a condensation reaction with said polymer .
  • a typical ratio of polymeric mass to crosslinker according to the present invention is 1 : 1 to 100 : 1.
  • Catalysts are typically used in low amounts , i . e . amounts sufficient for obtaining the desired curing times but still not constituting a significant impurity .
  • Typical total amounts for all of the components to be used according the present invention lie in a range of from 1 to 20 g, preferably 3 to 10 g .
  • the developing agent which can be used in the kit of the present invention may be any developing agent conventionally used in the art of developing fingerprints .
  • Examples are powders such as carbon black, aluminum powder, or magnetic or fluorescent powders .
  • the present invention is furthermore related to a process for the registration of fingerprints , comprising the steps of
  • a) developing a fingerprint on a surface b) mixing a clear polymer with a suitable crosslinker, optionally in the presence of a suitable catalyst; c) immediately applying the mixture obtained in step b) onto the developed fingerprint and allowing said mixture to form a cured clear layer; and d) lifting the cured layer obtained in step c) and comprising an impression of said fingerprint off of said surface .
  • the development of a fingerprint may be carried as conventionally performed in the art .
  • a developing agent such as , for example, carbon black powder
  • the surface to be examined is swept with a brush so that the developing agent adheres to any- present latent fingerprint, which in this way becomes developed, i . e . visible .
  • the clear crosslinkable polymeric mass is mixed with a suitable crosslinker, optionally in the presence of a catalyst .
  • a suitable crosslinker optionally in the presence of a catalyst .
  • the components are put on a separate obj ect, such as a piece of paper, and thoroughly mixed, e . g . by using a stick .
  • the mixing of the components may be performed by hand-mixing . It is also possible to perform automatic mixing using a conventional cartridge system with a static mixer . Immediately thereafter, the mixture thus obtained is applied on the developed fingerprint . This has to be done quickly since curing of the mixture starts instantaneously .
  • the mixture may be cast onto the developed fingerprint .
  • the applied layer consisting of said mixture may be smoothened, e . g . by using a plastic foil .
  • Typical curing times according to the present invention are several minutes , for example 3 to 10 minutes , preferably 4 to 6 minutes , under standard environmental conditions (23 0 C) .
  • curing times depend on the environmental conditions and may be shorter at elevated temperatures or longer at low temperatures .
  • the mixture is applied onto the fingerprint in such an amount that a cured clear layer is formed having a thickness not exceeding 5 mm.
  • Thicker layers significantly deteriorate or even completely prevent the taking of photographs through said cured clear layer . Since with increasing thickness the brilliance of the photography taken through said layer decreases as well as the danger of inclusions of air increases , it is preferred to have a thickness of the cured layer which does not exceed 1 mm, preferably not exceed 0.5 mm and most preferably is less than 0.4 mm.
  • the thus formed clear cured layer may be lifted off of the surface comprising the original fingerprint .
  • the clear cured layer contains a negative impression of the original fingerprint, which however is otherwise identical to the original fingerprint . It is now possible to take a photograph of said fingerprint impression contained in said cured layer from the upper side of said layer, i . e . from the side remote from said impression .
  • any device for takinghongs which is conventionally used in the art is suitable for that purpose .
  • the clear cured layer may be put on a white or colored surface, for example a piece of white paper, for the taking of the photograph .
  • any polymeric mass which forms a clear layer having the required physical parameters such as thickness , viscosity and tensile strength may be used in the above process .
  • the cured layer may be formed from a polymeric mass selected from the group consisting of silicone polymers , polyurethane polymers , polyether polymers , polyacrylates , styrene-butadiene-copolymers , and methyl methacrylate copolymers . It is especially preferred that the cured layer may be formed from the above-described polymeric masses and kits .
  • the present invention teaches the use of a clear crosslink- able polymeric mass for the registration of fingerprints .
  • the cured layer may be formed from a polymeric mass selected from the group consisting of silicone polymers , polyurethane polymers , polyether polymers , polyacrylates , styrene-butadiene-copolymers , and methyl methacrylate copolymers . It is especially preferred that the cured layer may be formed from the above-described polymeric masses and kits .
  • the main application for the polymeric masses and kits according to the present invention is the registration of fingerprints .
  • the masses and kits may also be used for the registration of other traces , such as for example traces made by a pencil .
  • FIG . 1 shows a photograph of a fingerprint taken through a clear cured layer according to the present invention .
  • a clear cured layer according to the present invention was prepared as follows on the basis of an addition-crosslinkable silicone polymer :
  • Component A 99.9 g Silopren Ul
  • Component B 90. O g Silopren Ul
  • the mixture was put onto the glass plate using a plastic foil, so that a layer having a thickness of 0.35 mm was obtained.
  • the layer was allowed to cure for about 5 minutes .
  • the cured layer was lifted off of the glass plate .
  • a photograph was taken through said layer from the upper side, resulting in a photograph showing the positive impression of the fingerprint .
  • the photograph is shown in Fig . 1. No further processing of the photograph was carried out .
  • a clear cured layer according to the present invention was prepared as follows on the basis of a condensation-crosslinkable silicone polymer :
  • Component A 1.0 g Silopren C Crosslinker 25
  • Component B 99. O g Silopren C2
  • a clear cured layer comprising a fingerprint impression was generated as described above in Example 1.

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  • Health & Medical Sciences (AREA)
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Abstract

La présente invention concerne des masses polymères réticulables transparentes utiles pour l'enregistrement d'empreintes digitales qui permettent d'obtenir des reproductions positives d'empreintes digitales lorsqu'on prend une photographie à travers une couche polymérisée transparente obtenue à partir desdites masses polymères.
PCT/EP2006/050290 2005-01-27 2006-01-18 Materiau polymere transparent utilise pour l'enregistrement d'empreintes digitales WO2006079599A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US64751905P 2005-01-27 2005-01-27
US60/647,519 2005-01-27
EP05100540.3A EP1693420B1 (fr) 2005-01-27 2005-01-27 Kit comprenant un matériau polymère transparent pour l'enregistrement de traces de doigt
EP05100540.3 2005-01-27

Publications (1)

Publication Number Publication Date
WO2006079599A1 true WO2006079599A1 (fr) 2006-08-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109222A1 (fr) * 2009-03-24 2010-09-30 University Of Leicester Procédé de visualisation d'une empreinte (digitale) sur une surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451692A (en) * 1980-01-08 1984-05-29 U.S. Philips Corporation Method of manufacturing a longitudinally watertight cable and longitudinally watertight cable thus obtained
US5728341A (en) * 1996-04-15 1998-03-17 Kim, Ii; Anthony Method for obtaining fingerprint impression
US6040354A (en) * 1995-02-21 2000-03-21 Ernst Muhlbauer Kg Impression compound with a silicon base and wax admixture
EP1288871A1 (fr) * 2001-08-15 2003-03-05 Eastman Kodak Company Document authentique et méthode de sa fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451692A (en) * 1980-01-08 1984-05-29 U.S. Philips Corporation Method of manufacturing a longitudinally watertight cable and longitudinally watertight cable thus obtained
US6040354A (en) * 1995-02-21 2000-03-21 Ernst Muhlbauer Kg Impression compound with a silicon base and wax admixture
US5728341A (en) * 1996-04-15 1998-03-17 Kim, Ii; Anthony Method for obtaining fingerprint impression
EP1288871A1 (fr) * 2001-08-15 2003-03-05 Eastman Kodak Company Document authentique et méthode de sa fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ARROWHEAD FORENSIC PRODUCTS: "Microcast Silicone Kit", 27 October 2004 (2004-10-27), XP002336116, Retrieved from the Internet <URL:http://web.archive.org/web/20041027051938/http://www.crime-scene.com/ecpi/5026.shtml> [retrieved on 20050713] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109222A1 (fr) * 2009-03-24 2010-09-30 University Of Leicester Procédé de visualisation d'une empreinte (digitale) sur une surface

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