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WO2002079342A1 - Afterglowing composition, product, and application thereof - Google Patents

Afterglowing composition, product, and application thereof Download PDF

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Publication number
WO2002079342A1
WO2002079342A1 PCT/NL2002/000196 NL0200196W WO02079342A1 WO 2002079342 A1 WO2002079342 A1 WO 2002079342A1 NL 0200196 W NL0200196 W NL 0200196W WO 02079342 A1 WO02079342 A1 WO 02079342A1
Authority
WO
WIPO (PCT)
Prior art keywords
afterglowing
composition according
pigment
polymer material
composition
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.)
Ceased
Application number
PCT/NL2002/000196
Other languages
French (fr)
Inventor
Johannes Alfred Beele
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.)
Beele Engineering BV
Original Assignee
Beele Engineering BV
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 Beele Engineering BV filed Critical Beele Engineering BV
Publication of WO2002079342A1 publication Critical patent/WO2002079342A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K2/00—Non-electric light sources using luminescence; Light sources using electrochemiluminescence
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • 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
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • 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
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials

Definitions

  • the present invention relates to an afterglowing composition with a base of crystal-clear polymer materials and an afterglowing pigment.
  • compositions with a base of pigments and crystal-clear polymer materials are known.
  • the processing of such pigments in hard plastics is difficult, however, and generally laborious because the heavier pigments in the composition tend to settle during the injection moulding process. Generally, this makes the composition unusable.
  • the object of the present invention is to provide an afterglowing composition with a base of crystal-clear polymer materials, in which the above-mentioned drawbacks have been overcome .
  • the composition comprises a bonding agent for bonding the afterglowing pigment to the crystal-clear polymer material.
  • the bonding agent according to the invention is an agent with a base of a transparent mineral or synthetic oil.
  • the transparent oil that is used in accordance with the invention preferably has a viscosity ranging between 50 and 2000 Pa.s, more preferably between 100 and 1000 mPa . s .
  • the bonding agent that is used is preferably compatible with the polymer material that is used so as to prevent sweating of the bonding agent.
  • the transparent oil is preferably a paraffin oil.
  • Paraffin oils are mineral oils having a certain degree of transparency, which are extracted as minerals. Such a bonding agent will effect an adequate distribution of the pigment particles over the polymer material.
  • a properly homogeneously distributed afterglowing composition which can be directly processed, is obtained if said composition comprises the bonding agent in a concentration of 0.1-2 wt . %.
  • the exact amount will depend on the amount of pigment that is used.
  • the crystal-clear polymer materials according to the invention are preferably selected from the group comprising polycarbonate, polyacrylate, polystyrene and acryl nitrile- butadiene-n-styrene (ABS) .
  • the polymer material is polycarbonate.
  • the use of said material has several advantages as regards the processing thereof and the application thereof in transparent, impact-resistant objects.
  • the composition according to the invention comprises 4-12 parts by weight, more preferably 6-10 parts by weight, of the afterglowing pigment per 100 g of polymer material.
  • the term afterglowing pigment is understood to mean a fluorescent and/or a phosphorescent pigment, that is, a pigment having afterglowing properties. Fluorescence is the process in which radiation is emitted by a transition between two molecular energy levels having the same spin condition, whilst in the case of phosphorescence radiation is emitted by a transition between two molecular energy levels having different spin conditions. The duration of the fluorescence is very short, and generally it only occurs to a visible extent when a fluorescent pigment is exposed to light.
  • Phosphorescent pigments are capable of emitting light for a much longer period of time after being exposed to light.
  • a further advantage of both fluorescent and phosphorescent pigments is that they are capable of emitting light having a wavelength range different from that of the light to which they are being or have been exposed.
  • such a pigment is capable of emitting light of a particular colour or hue upon being exposed or after being exposed to, for example, "white light”.
  • the afterglowing pigment according to the invention preferably consists of an alkaline-earth metal containing aluminate being doped with one or more transition metals, and/or a mixture comprising zinc sulphide and copper.
  • the afterglowing pigment is in particular an alkaline-earth metal containing aluminate doped with one or more transition metals and having a density of approximately 3.5 g/ml .
  • the afterglowing pigment preferably has an average particle size distribution of 0.1-50 ⁇ m, more preferably 0.5-25 ⁇ m, and in particular 1-10 ⁇ m, for example 7 ⁇ m. With such a small particle size, the pigments are not visible to the naked eye.
  • the afterglowing pigments can be irradiated with light having a wavelength range of about 350-450 nm, in particular 380-400 nm, and generally they emit light having a wavelength range of about 475-575 nm, with the wavelength maximum being about . 520 nm.
  • the afterglowing composition preferably emits yellowish to greenish light.
  • the afterglowing pigment has an afterglow in accordance with DIN 67510, part 4 (1995) of at least 1350 minutes, preferably at least 2000 minutes, with a visibility limit of 0.3 mcd/m 2 , so that a light intensity will still be visible to the naked eye.
  • the light intensity of the light being emitted by the afterglowing pigment is at least 170 mcd/m 2 , preferably at least 400 mcd/m 2 after 5 minutes, and at least 25 mcd/m 2 , preferably at least 65 mcd/m 2 after 30 minutes. After 120 minutes, the light intensity is preferably at least 5 mcd/m 2 , more preferably at least 11 mcd/m 2 .
  • the invention furthermore relates to and provides a product obtained from an afterglowing composition as described above.
  • the products obtained by using the composition according to the invention are at least partially transparent, they exhibit a high impact-resistance and they are capable of withstanding high temperatures.
  • the product comprises a front plate for light fittings.
  • the white yellow pigments in the composition are fully exposed to the light of the lamp in the light fittings, with white light from, for example, a conventional neon tube, a light bulb or a halogen lamp, being emitted, therefore.
  • white light from, for example, a conventional neon tube, a light bulb or a halogen lamp, being emitted, therefore.
  • the crystal-clear polymer materials such as polycarbonate
  • the risk of damage to the light fitting is excluded.
  • a green-yellow light will be emitted for a particular period of time as a result of the action of the afterglowing pigments.
  • the products obtained by using the afterglowing composition according to the invention can be used for various purposes.
  • a very suitable application is the use thereof in emergency lighting.
  • light fittings provided with a front plate made from the composition according to the invention can function as ordinarily lighting fixtures in, for example, the corridors of various public spaces, such as (cruise) ships, cinemas, etc.
  • emergency lighting will be available at all times, due to the afterglowing properties of the pigments that are contained in the front plate.
  • the lighting may include special signs/signals for guiding persons to the nearest emergency exit, for example.
  • the afterglowing composition according to the invention can be obtained, for example, by mixing 100 g of a crystal-clear a polymer material, for example a granulate of polycarbonate having a specific mass of about 1.2 g/cm 3 , with 6-8 g of an afterglowing alkaline-earth pigment having a specific mass of 3.5 g/cm 3 and an average particle size of about 7 ⁇ m.
  • a crystal-clear a polymer material for example a granulate of polycarbonate having a specific mass of about 1.2 g/cm 3
  • 6-8 g of an afterglowing alkaline-earth pigment having a specific mass of 3.5 g/cm 3 and an average particle size of about 7 ⁇ m.
  • a paraffin oil is added as a bonding agent in an amount of about 1 wt . %.
  • a good, homogeneous dispersion is obtained by first adding said bonding agent to the plastic granulate, after which the pigments is bonded thereto.
  • the obtained afterglowing composition can then be introduced into an extruder or than injection-moulding machine and be processed by means of methods that are known to those skilled in the art.
  • Products that at least partially consist of the afterglowing composition according to the invention will emit their light in, for example, emergency situations, such as an indoor fire or a power failure.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The present invention relates to an afterglowing composition with a base of a crystal-clear polymer material and an afterglowing pigment, comprising a bonding agent for bonding the afterglowing pigment to the crystal-clear polymer material. The present invention furthermore relates to products obtained from such an afterglowing composition and to the application therof in emergency lighting.

Description

AFTERGLOWING COMPOSITION, PRODUCT, AND APPLICATION THEREOF
The present invention relates to an afterglowing composition with a base of crystal-clear polymer materials and an afterglowing pigment.
Compositions with a base of pigments and crystal-clear polymer materials are known. The processing of such pigments in hard plastics is difficult, however, and generally laborious because the heavier pigments in the composition tend to settle during the injection moulding process. Generally, this makes the composition unusable. In order to prevent settling of the pigments, it is known to granulate the pigment-plastic mixture first after the extrusion step so as to obtain a homogeneous distribution of the pigments and the plastic material, and subsequently add the granulate to the feeding zone (hopper) of the injection moulding machine for further processing.
The object of the present invention is to provide an afterglowing composition with a base of crystal-clear polymer materials, in which the above-mentioned drawbacks have been overcome .
This objective is accomplished in that the composition comprises a bonding agent for bonding the afterglowing pigment to the crystal-clear polymer material. By bonding the afterglowing pigments to the polymer material, a homogeneous mixing of the polymer material and the pigments is obtained in a simple manner, so that processing thereof in an injection moulding process can take place directly without an additional processing step of granulating, for example, being required .
In a very suitable embodiment of the invention, the bonding agent according to the invention is an agent with a base of a transparent mineral or synthetic oil. The transparent oil that is used in accordance with the invention preferably has a viscosity ranging between 50 and 2000 Pa.s, more preferably between 100 and 1000 mPa . s . The bonding agent that is used is preferably compatible with the polymer material that is used so as to prevent sweating of the bonding agent.
The transparent oil is preferably a paraffin oil. Paraffin oils are mineral oils having a certain degree of transparency, which are extracted as minerals. Such a bonding agent will effect an adequate distribution of the pigment particles over the polymer material.
A properly homogeneously distributed afterglowing composition, which can be directly processed, is obtained if said composition comprises the bonding agent in a concentration of 0.1-2 wt . %. The exact amount will depend on the amount of pigment that is used.
The crystal-clear polymer materials according to the invention are preferably selected from the group comprising polycarbonate, polyacrylate, polystyrene and acryl nitrile- butadiene-n-styrene (ABS) . In a very suitable embodiment of the invention, the polymer material is polycarbonate. On account of the excellent mechanical properties, such as the impact resistance, the physical properties, such as the resistance against high temperatures, and the optical properties, such as clearness, of polycarbonate, the use of said material has several advantages as regards the processing thereof and the application thereof in transparent, impact-resistant objects.
Preferably, the composition according to the invention comprises 4-12 parts by weight, more preferably 6-10 parts by weight, of the afterglowing pigment per 100 g of polymer material. According to the present invention, the term afterglowing pigment is understood to mean a fluorescent and/or a phosphorescent pigment, that is, a pigment having afterglowing properties. Fluorescence is the process in which radiation is emitted by a transition between two molecular energy levels having the same spin condition, whilst in the case of phosphorescence radiation is emitted by a transition between two molecular energy levels having different spin conditions. The duration of the fluorescence is very short, and generally it only occurs to a visible extent when a fluorescent pigment is exposed to light. Phosphorescent pigments, however, are capable of emitting light for a much longer period of time after being exposed to light. A further advantage of both fluorescent and phosphorescent pigments is that they are capable of emitting light having a wavelength range different from that of the light to which they are being or have been exposed. Thus, such a pigment is capable of emitting light of a particular colour or hue upon being exposed or after being exposed to, for example, "white light".
The afterglowing pigment according to the invention preferably consists of an alkaline-earth metal containing aluminate being doped with one or more transition metals, and/or a mixture comprising zinc sulphide and copper. The afterglowing pigment is in particular an alkaline-earth metal containing aluminate doped with one or more transition metals and having a density of approximately 3.5 g/ml . The afterglowing pigment preferably has an average particle size distribution of 0.1-50 μm, more preferably 0.5-25 μm, and in particular 1-10 μm, for example 7 μm. With such a small particle size, the pigments are not visible to the naked eye. The afterglowing pigments can be irradiated with light having a wavelength range of about 350-450 nm, in particular 380-400 nm, and generally they emit light having a wavelength range of about 475-575 nm, with the wavelength maximum being about . 520 nm. The afterglowing composition preferably emits yellowish to greenish light.
In a preferred embodiment of the invention, the afterglowing pigment has an afterglow in accordance with DIN 67510, part 4 (1995) of at least 1350 minutes, preferably at least 2000 minutes, with a visibility limit of 0.3 mcd/m2, so that a light intensity will still be visible to the naked eye.
The light intensity of the light being emitted by the afterglowing pigment is at least 170 mcd/m2, preferably at least 400 mcd/m2 after 5 minutes, and at least 25 mcd/m2, preferably at least 65 mcd/m2 after 30 minutes. After 120 minutes, the light intensity is preferably at least 5 mcd/m2, more preferably at least 11 mcd/m2.
The invention furthermore relates to and provides a product obtained from an afterglowing composition as described above. The products obtained by using the composition according to the invention are at least partially transparent, they exhibit a high impact-resistance and they are capable of withstanding high temperatures.
In a special preferred embodiment, the product comprises a front plate for light fittings. In normal conditions, the white yellow pigments in the composition are fully exposed to the light of the lamp in the light fittings, with white light from, for example, a conventional neon tube, a light bulb or a halogen lamp, being emitted, therefore. As a result of the impact-resistance of the crystal-clear polymer materials, such as polycarbonate, the risk of damage to the light fitting is excluded. After the lamp has been turned off, a green-yellow light will be emitted for a particular period of time as a result of the action of the afterglowing pigments.
The products obtained by using the afterglowing composition according to the invention can be used for various purposes. A very suitable application is the use thereof in emergency lighting. Under normal circumstances, light fittings provided with a front plate made from the composition according to the invention can function as ordinarily lighting fixtures in, for example, the corridors of various public spaces, such as (cruise) ships, cinemas, etc. In the case of a power failure, however, emergency lighting will be available at all times, due to the afterglowing properties of the pigments that are contained in the front plate. By hanging the light fittings at a height of, for example, maximally about 500 mm, preferably maximally 300 mm, above the floor, the space above the floor will be illuminated to such an extent in emergency situations that it is ensured that the floor will be properly visible. The lighting may include special signs/signals for guiding persons to the nearest emergency exit, for example. By hanging the light fitting at a relatively low height, it is moreover ensured that the floor will be properly illuminated and that, in addition, the emergency lighting will also remain visible in the case of heavy smoke, whilst the impact-resistance of the plastic material minimises the material being damaged, for example as a result of being bumped against, etc.
The afterglowing composition according to the invention can be obtained, for example, by mixing 100 g of a crystal-clear a polymer material, for example a granulate of polycarbonate having a specific mass of about 1.2 g/cm3, with 6-8 g of an afterglowing alkaline-earth pigment having a specific mass of 3.5 g/cm3 and an average particle size of about 7 μm.
In order to obtain a proper mixing of the afterglowing pigment with the plastic starting material, a paraffin oil is added as a bonding agent in an amount of about 1 wt . %. A good, homogeneous dispersion is obtained by first adding said bonding agent to the plastic granulate, after which the pigments is bonded thereto.
The obtained afterglowing composition can then be introduced into an extruder or than injection-moulding machine and be processed by means of methods that are known to those skilled in the art.
Products that at least partially consist of the afterglowing composition according to the invention will emit their light in, for example, emergency situations, such as an indoor fire or a power failure.

Claims

1. An afterglowing composition with a base of a crystal- clear polymer material and an afterglowing pigment, characterized in that the composition comprises a bonding agent for bonding the afterglowing pigment to the crystal-clear polymer material.
2. An afterglowing composition according to claim 1, characterized in that the bonding agent is an agent with a base of a transparent oil.
3. An afterglowing composition according to claim 2, characterized in that the transparent oil is a paraffin oil.
4. An afterglowing composition according to claim 1, 2 or 3, characterized in that the composition comprises said bonding agent in a concentration of 0.1-2 wt . %.
5. An afterglowing composition according to any one of the claims 1-4, characterized in that the crystal-clear polymer material is selected from the group comprising polycarbonate, polyacrylate, polystyrene and acryl nitrile-butadiene-n-styrene (ABS) .
6. An afterglowing composition according to claim 5, characterized in that the crystal-clear polymer material is polycarbonate.
7. An afterglowing composition according to any one of the claims 1-6, characterized in that the composition comprises 4-12 parts by weight of the afterglowing pigment per 100 g of polymer material.
8. An afterglowing composition according to claim 7, characterized in that the composition comprises 6-8 parts by weight of the afterglowing pigment per 100 g of polymer material.
9. An afterglowing composition according to any one of the preceding claims, characterized in that the afterglowing pigment has an average particle size distribution of 0.1-50 μm.
10. An afterglowing composition according to claim 9, characterized in that the afterglowing pigment has an average particle size distribution of 0.5-25 μm.
11. An afterglowing composition according to claim 10, characterized in that the afterglowing pigment has an average particle size distribution of 1-10 μm.
12. A product from an afterglowing composition according to any one of the claims 1-11.
13. A product according to claim 12, characterized in that the product comprises a front plate for light fittings.
1 . Application of a product according to claim 12 or 13 in emergency lighting.
PCT/NL2002/000196 2001-03-30 2002-03-27 Afterglowing composition, product, and application thereof Ceased WO2002079342A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1017750 2001-03-30
NL1017750A NL1017750C2 (en) 2001-03-30 2001-03-30 Follow-up composition, product and application thereof.

Publications (1)

Publication Number Publication Date
WO2002079342A1 true WO2002079342A1 (en) 2002-10-10

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NL (1) NL1017750C2 (en)
WO (1) WO2002079342A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8691915B2 (en) 2012-04-23 2014-04-08 Sabic Innovative Plastics Ip B.V. Copolymers and polymer blends having improved refractive indices

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721007A1 (en) * 1994-12-28 1996-07-10 Ykk Corporation Phosphorescent synthetic resin material, method for production thereof, and formed article
WO2000027908A2 (en) * 1998-11-10 2000-05-18 M.A. Hannacolor A Division Of M.A. Hanna Company Daylight/nightglow colored phosphorescent plastic compositions and articles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721007A1 (en) * 1994-12-28 1996-07-10 Ykk Corporation Phosphorescent synthetic resin material, method for production thereof, and formed article
WO2000027908A2 (en) * 1998-11-10 2000-05-18 M.A. Hannacolor A Division Of M.A. Hanna Company Daylight/nightglow colored phosphorescent plastic compositions and articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8691915B2 (en) 2012-04-23 2014-04-08 Sabic Innovative Plastics Ip B.V. Copolymers and polymer blends having improved refractive indices

Also Published As

Publication number Publication date
NL1017750C2 (en) 2002-10-01

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