GB2084591A - Process for Photocuring Photocurable Compositions - Google Patents
Process for Photocuring Photocurable Compositions Download PDFInfo
- Publication number
- GB2084591A GB2084591A GB8031469A GB8031469A GB2084591A GB 2084591 A GB2084591 A GB 2084591A GB 8031469 A GB8031469 A GB 8031469A GB 8031469 A GB8031469 A GB 8031469A GB 2084591 A GB2084591 A GB 2084591A
- Authority
- GB
- United Kingdom
- Prior art keywords
- discharge lamp
- flash discharge
- photosensitive resin
- curing
- irradiated
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000000203 mixture Substances 0.000 title description 2
- 238000000016 photochemical curing Methods 0.000 title 1
- 239000011347 resin Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011521 glass Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000007639 printing Methods 0.000 abstract description 3
- 229910052724 xenon Inorganic materials 0.000 abstract description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 239000008199 coating composition Substances 0.000 abstract description 2
- 239000000976 ink Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Printing Methods (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
Photosensitive resins used in photoengraving materials, printing ink, coating compositions, adhesives and other materials are cured to form satisfactory dry layers by using, as the ultra-violet light source, a flash discharge lamp which is a cold light source capable of instantly producing the total amount of light required, in which the emission energy J (joule) is controlled within the range of 0.02</=J/S</=8 where S (cm<2>) denotes the area to be irradiated, or within the range of 0.002</=J/Sd</=2 wherein S (cm<2>) denotes the area to be irradiated and d ( mu m) stands for the thickness of the photosensitive resin layer after curing. The glass bulb of the lamp is filled with a rare gas e.g. xenon.
Description
SPECIFICATION
Method of Curing Photosensitive Resin Layers
Background of the Invention
Field of the Invention
The present invention relates to a method of curing photosensitive resin layers, and more particularly relates to a method of curing photosensitive resin layers with the ultraviolet light produced by a flash discharge lamp.
Description of the Prior Art
Only a little over ten years have passed since attention was first drawn to the photosensitive resins. However, their uses have been remarkabiy extended as a result of succeeding developmental efforts, starting from the initial application to photoengraving materials and now including printing ink, coating compositions, adhesives and other industrial product.
They are used in the form of sheets, film patterns, and letter, and are cured from the liquid into the solid state through irradiation of ultavioiet light. Chemically, this process is photopolymerization of low molecular weight substances induced by ultraviolet light, but is sometimes called "drying" in the paint and printing ink fields.
Conventionally a mercury discharge lamp, or a mixed-metal-vapor discharge lamp, a modification of the mercury discharge lamp in which part of the mercury is replaced by other metals, has been used as the UV-light source.
However, these lamps suffer from the following disadvantages: (1 It generally several minutes; several tens of seconds even with the most advanced type; to generate the total amount of light designed after starting the lamp. This results in poor operation efficiency.
(2) It is known that, to overcome this difficulty, the lamp is housed in a casing provided with a shutter and curing is carried out by intermittent opening of the shutter. However, the complicated structure of the casing, its troublesome handling, and unnecessary consumption of power are the disadvantages involved in this method.
(3) In order to efficiently emit the light of the wave-length region which is effective for photopolymerization, the bulb wall must always be maintained at high temperatures to ensure a high vapor pressure of the metal at all times. As a result, the life of the bulb is liable to be short.
Also, because of the large amount of heat produced, combined with the longer irradiation time required, sharp reproduction of images may be affected physically, or by a thermochemical reaction which proceeds concurrently with the photochemical reaction, in the case of letters and patterns which are composed of fine lines.
Summary of the Invention
The object of the present invention is to offer a novel method of curing photosensitive resin layers which is free from the disadvantages mentioned above. The present invention relates to a method of curing photosensitive resin layers having the main photosensitive peak in the wavelength region not more than 4500A to form solid layers having a thickness of 100 microns or less, by using a flash discharge lamp with its glass bulb filled with a rare gas as the main component, the emission energy J (joule) generated from said flash discharge lamp being controlled within the range of 0.02J/S8 wherein S (cm2) denotes the area to be irradiated; and a method of curing photosensitive resin layers having the main photosensitive peak in the wavelength region not more than 4500A to form solid layers having a thickness of more than 100 microns, by using a flash discharge lamp with its glass bulb filled with a rare gas as the main component, the emission energy J (joule) generated from said flash discharge lamp being controlled within the range of 0.002 < J/S < 2 wherein S (cm2) denotes the area to be irradiated and d (micron) stands for the thickness of the photosensitive resin layer after curing.
In short, the present invention consists in using, as the source of ultraviolet light, a flash discharge lamp which is a cold light source capable of instantly producing the total designed amount of light, and in reasonably controlling the emission energy of that flash discharge lamp.
Flash discharge lamps have been used for various industrial purposes. However, it was revealed that they can be used successfully as a means of curing photosensitive resin layers, as offered in the present invention, only under specific conditions, for which a detailed and comprehensive investigation was needed. The present invention has been accomplished as a result of this investigation.
Brief Description of the Drawings
Fig. 1 is a schematic view showing an apparatus for the method of the present invention.
Fig. 2 is a schematic view illustrating the configuration of a flash discharge lamp used in the present invention and the power supply circuit.
Description of the Preferred Embodiments
Fig. 1 shows a preferred embodiment of the present invention in which an ink layer 2 printed on an acrylic plate 1 to a thicknes of about 20
microns is cured by means of a flash discharge lamp 4 with a mirror 3 equipped adjacent thereto.
Fig. 2 illustrates a preferred configuration of said flash discharge lamp 4 and the power supply circuit connected thereto. Numeral 3' shows the support frame for an internal reflective surface to efficiently guide the flash light to the article being irradiated with a minimum of loss, numeral 5 is a glass bulb, numeral 6 is a metal cap to seal both ends of the bulb airtight, numeral 7 is a cathode, numeral 8 is an anode, L is the discharge distance, and D is the inside diameter of the bulb.
The power supply circuit to start the flash discharge lamp 4 comprises high voltage generator HV connected through charging resistor
R, discharging capacitor C and trigger switch SW, and trigger electrode 9 connected to said high voltage generator HV. If trigger switch SW is closed to apply a high electric potential to the flash discharge lamp and to ionize the gas filled in the bulb, the electric charge accumulated in the discharging capacitor will be discharged, causing
the lamps to emit flash light.
Ink 2 is an offset printing ink having the main photosensitive peak in the wavelength region not
more than 4500A for example, "Toka UV-Cure
BF" (Toka Shikiso Kagaku Kogyo). This ink can be
instantly cured by irradiation of ultraviolet light from the flash discharge lamp without any adverse thermal effect. In an example, an ink layer coated over the area of S=1 Ocmx20cm to a thickness (d) of about 20 microns was instantly cured to give satisfactory solid film when irradiated under the following conditions: discharge distance L=26cm, inside diameter of bulb D=0.8 cm, xenon gas charge pressure=200mmHg, emission energy J=800 joules (to give an energy radiation density
Q of 20.4), and t=3msec.A number of flash discharge lamps having different bulb diameters of at least 0.3cm and different discharge distances of at least 3cm were fabricated, and their glass bulbs were filled with xenon, other rare gases or a mixture thereof.
Similar experiments as above were conducted using these lamps with different J values. It was demonstrated from these experiments that, if the value J/S is less than 0.02, part of the resin layer is left uncured. If the value J/S is larger than 8, on the other hand, degradation occurs on the surface of the cured film. The former trouble may be ascribed to insufficient dose of ultraviolet light, while the latter may be considered to be a deteriorated surface appearance due to thermal degradation often encountered in plastic materials. In any event, satisfactory results can be achieved only within the range of 0.02J/S$8.
Other factors considered were the thickness of the ink layer and the distance between the flash discharge lamp and the ink layer. Experiments
revealed that the thickness of the ink layer has no effect on the result for levels not larger than 100
microns; the distance between the lamp and the
ink layer was found to have no effect within the
range of 5cm to 25cm, if the support frame is
provided.
In another series of experiments in which the
value of Sxd, that is, the quantity or the volume
of the ink present on a given area, was varied, it was demonstrated that, it the value J/Sd is less than 0.002, part of the resin layer is left uncured.
If this value exceeds 2, on the other hand, degradation occurs on the surface of the cured film. The former troubie may be attributed to insufficient dose of ultraviolet light, while the latter is considered to be a deteriorated surface appearance due to thermal degradation often encountered in plastic materials. In this case, too, satisfactory results can be achieved only within a definite range of dose, 0.002~J/Sd~2.
The effect of the amount of ink was investigated because of the findings that curing is = influenced by the thickness of ink (which defines the amount of ink present on a given area) when it exceeds 100 microns. It was found that the distance between the lamp and the ink layer has no effect even for the larger ink thicknesses.
As is apparent from the above, the present invention relates to a method of curing photosensitive resin layers to give satisfactory solid film free from disadvantages unavoidable in conventional method, by using, as the source of ultraviolet light, a flash discharge lamp which is a cold light source capable of instantly producing the total designed amount of light and by reasonably controlling the emission energy generated from that flash discharge lamp, and is highly valuable in practical applications.
Claims (3)
1. A method of curing photosensitive resin layers having the main photosensitive peak in the wavelength region not more than 4500A to form solid layers having a thickness of 100 microns or less, by using a flash discharge lamp with its glass bulb filled with a rare gas as the main component, the emission energy J (joule) generated from said flash discharge lamp being controlled within the range of 0.02 < J/S~8 wherein S (cm2) denotes the area to be irradiated.
2. A method of curing photosensitive resin layers having the main photosensitive peak in the wavelength region not more than 4500A to form solid layers having a thickness of more than 100 & microns, by using a flash discharge lamp with its glass bulb filled with a rare gas as the main component, the emission energy J (joule) generated from said flash discharge lamp being controlled within the range of 0.002~J/Sd~2 wherein S (cm2) denotes the area to be irradiated and d (micron) stands for the thickness of the photosensitive resin layer after curing.
3. A method of curing photosensitive resin layers substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8031469A GB2084591B (en) | 1980-09-30 | 1980-09-30 | Process for photo curing photo curable compositions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8031469A GB2084591B (en) | 1980-09-30 | 1980-09-30 | Process for photo curing photo curable compositions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2084591A true GB2084591A (en) | 1982-04-15 |
| GB2084591B GB2084591B (en) | 1984-05-31 |
Family
ID=10516375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8031469A Expired GB2084591B (en) | 1980-09-30 | 1980-09-30 | Process for photo curing photo curable compositions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2084591B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326419B1 (en) * | 1997-08-05 | 2001-12-04 | Sericol Limited | Ink jet ink |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428206B (en) * | 2015-12-17 | 2017-07-18 | 中国工程物理研究院激光聚变研究中心 | A kind of pyrotechnics flash lamp of use solid-state pyrotechnic compound |
-
1980
- 1980-09-30 GB GB8031469A patent/GB2084591B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326419B1 (en) * | 1997-08-05 | 2001-12-04 | Sericol Limited | Ink jet ink |
| US6627677B2 (en) | 1997-08-05 | 2003-09-30 | Sericol Limited | Ink jet inks and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2084591B (en) | 1984-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20000929 |