EP1071728A1 - Compostions radioluminescentes - Google Patents

Compostions radioluminescentes

Info

Publication number
EP1071728A1
EP1071728A1 EP99910033A EP99910033A EP1071728A1 EP 1071728 A1 EP1071728 A1 EP 1071728A1 EP 99910033 A EP99910033 A EP 99910033A EP 99910033 A EP99910033 A EP 99910033A EP 1071728 A1 EP1071728 A1 EP 1071728A1
Authority
EP
European Patent Office
Prior art keywords
dye
radioluminescent
radioactive
ink
substitution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99910033A
Other languages
German (de)
English (en)
Other versions
EP1071728A4 (fr
Inventor
Greg Clement
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 AUPP2284A external-priority patent/AUPP228498A0/en
Priority claimed from AUPP5074A external-priority patent/AUPP507498A0/en
Priority claimed from AUPP8194A external-priority patent/AUPP819499A0/en
Application filed by Individual filed Critical Individual
Publication of EP1071728A1 publication Critical patent/EP1071728A1/fr
Publication of EP1071728A4 publication Critical patent/EP1071728A4/fr
Withdrawn legal-status Critical Current

Links

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
    • C09D11/00—Inks
    • C09D11/50—Sympathetic, colour changing or similar inks

Definitions

  • This invention relates to radioluminescent compositions .
  • This invention has particular application to radioluminescent inks for printing, writing and drawing, and for illustrative purposes reference will be made to this application. However, it will be understood by persons skilled in the art that this invention may find use in other applications, including but not limited to radioluminescent colourants and tints for liquids and solids such as resins and plastics, fabric printing, media and the like.
  • Radioluminescence may be defined as a property of a compound or composition including a luminophore and a radioactive source, radioactive decay providing an energetic emission capable of excitation of the luminophore followed by decay of the exited luminophore with emission of a photon at the luminophore ' s characteristic visible-light wavelength.
  • radioluminescence has found application in radioluminescent paints for watch faces and the like, wherein the pigment system comprises a radioactive compound and a fluorescent pigment .
  • the pigment system comprises a radioactive compound and a fluorescent pigment .
  • examples of such compositions include the now-banned radium/zinc sulphide instrument face compositions and their replacement, being the use of a tritiated organic binder for a zinc sulphide or other fluorescent pigment.
  • Radioluminescent paints comprising tritiated binders tend to lose effectiveness through loss of tritium by hydrogen exchange with, for example, water vapour in the air. This is particularly so at the 2 important surface region of the paint film.
  • the radioluminescent paint compositions are by their nature unsuitable for use as a coloured ink. Firstly, the presence of solid pigments prevents their use in implements having a wick-type applicator such as a conventional fluorescent pen or other capillary applicators. Secondly, the inherent opacity of present radioluminescent paints prevent their use in applications where the colourant must allow transmission of coloured light reflected from the substrate, in the manner of a coloured ink.
  • ink is used to describe a composition of a dye and a liquid carrier wherein on application to a substrate and drying, there is left a dye residue.
  • Pigt is used to describe a composition of a pigment and a binder which on application to a substrate and drying forms a protective coating.
  • This invention in one aspect resides broadly in a radioluminescent ink composition including a phosphor or a dye having a fluorescent moiety, a radioactive source selected to have an emission capable of exciting said fluorescent moiety or phosphor, and a liquid carrier.
  • the dye may comprise a soluble dye or a dispersible dye.
  • dispersible dyes it is preferred that these be selected from dyes forming sols or colloids in the liquid carrier such that the ink composition may be useful in capillary applicators.
  • the dye it is preferred that the dye be a soluble dye .
  • the ink composition may comprise a further non- fluorescent dye or fluorescent dye not responsive to the emission of the radioactive source.
  • the dye is selected to be of substantially the same spectral colour as the fluorescence to allow maximum transmission.
  • the radioactive source may comprise a radioactive element or a compound having one or more radioactive atoms, the element or atoms being selected to have a radioactive emission capable of exciting the fluorescent 3 moiety to an energy level from which it may decay to emit light in the visible spectrum.
  • the element or compound is preferably substantially non-volatile on evaporation of the carrier.
  • the element or compound is preferably soluble in the carrier or is dispersible therein. In the case of dispersible elements or compound, it is preferred that the element or compound forms a sol or colloid in the carrier.
  • the radioactive source may comprise a substitution of an atom or atoms of the fluorescent dye with a radioactive atom thus rendering the dye autofluorescent or luminescent.
  • the substituted atom may comprise a different element from the atom generally present at the site of substitution.
  • the substitution may comprise a radioactive isotope of the same element at the site of substitution whereby the electronic and thus chemical and electronic-resonance nature of the dye is substantially unaltered by the substitution.
  • the site of substitution be selected to be relatively stable against atomic exchange and rearrangement which may result in loss of radioactive source. Accordingly, it is preferred that the substitution be in respect of a covalently bonded atom that is not dissociable in the carrier or by water, and is not likely to undergo reaction, exchange or rearrangement in the environment of the ink in use.
  • substitution may advantageously comprise tritiation at one or more stable hydrogen sites.
  • the radioactive source is preferably selected to be resistant to absorption through the skin or epithelia.
  • certain triatiated cellulose derivatives may be selected for resistance to absorption.
  • the carrier may take any suitable form for ink carriers having regard to the physical and chemical characteristics of the dye and radioactive source.
  • the carrier will not comprise the radioactive source since by definition at least a major proportion of the carrier is lost by evaporation.
  • the ink may include opaque masking agents such as Titanium Dioxide or Carbon Black, for example.
  • Example 2 The composition of Example 2 was mixed with methyl green dye for a daylight-visible ink. The addition of dye allows the writing to be seen in ambient light.
  • Example 3 has added thereto Titanium dioxide as an opacifying or masking agent, rendering the ink white in daylight.
  • Example 5 To the ink of Example 5 was added a methyl green dye.
  • An ethanol/glycerine mixture was mixed to a specific activity of ⁇ l-5 Ci/mL with fluorescein tritiated by replacing several hydrogens on the benzoic acid side-ring to form an ink composition.
  • An ethanol/glycerine mixture was mixed with a carbon-5 tritiated ⁇ 10-ring-chain cellulose hydrolysate to a specific activity of ⁇ l-5 Ci/mL and fluorescein to form an ink composition.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

L'invention concerne une composition d'encre radioluminescente constituée d'un colorant possédant un fragment fluorescent, d'une source radioactive choisie pour ses propriétés d'émission la rendant capable d'exciter ledit fragment fluorescent, et d'un vecteur liquide.
EP99910033A 1998-03-12 1999-03-12 Compostions radioluminescentes Withdrawn EP1071728A4 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AUPP2284A AUPP228498A0 (en) 1998-03-12 1998-03-12 Luminous ink applications
AUPP228498 1998-03-12
AUPP507498 1998-08-06
AUPP5074A AUPP507498A0 (en) 1998-08-06 1998-08-06 Luminous ink applications
AUPP8194A AUPP819499A0 (en) 1999-01-18 1999-01-18 Luminous ink applications
AUPP819499 1999-01-18
PCT/AU1999/000188 WO1999046340A1 (fr) 1998-03-12 1999-03-12 Compostions radioluminescentes

Publications (2)

Publication Number Publication Date
EP1071728A1 true EP1071728A1 (fr) 2001-01-31
EP1071728A4 EP1071728A4 (fr) 2001-09-26

Family

ID=27158067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910033A Withdrawn EP1071728A4 (fr) 1998-03-12 1999-03-12 Compostions radioluminescentes

Country Status (2)

Country Link
EP (1) EP1071728A4 (fr)
WO (1) WO1999046340A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006091214A2 (fr) * 2004-06-18 2006-08-31 Molecular Probes, Inc. Marqueurs isotopiques fluorescents et methode d'utilisation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4889660A (en) * 1987-12-24 1989-12-26 Battelle Memorial Institute Radioluminescent light sources, tritium containing polymers, and methods for producing the same
US4997597A (en) * 1989-11-13 1991-03-05 The United States Of America As Represented By The United States Department Of Energy Solid-state radioluminescent compositions
US5122305A (en) * 1990-03-20 1992-06-16 Ashley Carol S Solid-state radiation-emitting compositions and devices

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9946340A1 *

Also Published As

Publication number Publication date
EP1071728A4 (fr) 2001-09-26
WO1999046340A1 (fr) 1999-09-16

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