(19) |
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EP 0 797 238 B1 |
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EUROPEAN PATENT SPECIFICATION |
(45) |
Mention of the grant of the patent: |
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17.10.2001 Bulletin 2001/42 |
(22) |
Date of filing: 18.03.1997 |
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(54) |
Light-screening film paint for lamps, and light-screening film for lamps and producing
method thereof
Lichtabschirmender Anstrichmittel für Lampen, lichtabschirmender Film für Lampen und
deren Herstellungsverfahren
Peinture opaque à la lumière pour lampes, film opaque à la lumière pour lampes et
leur procédé de fabrication
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(84) |
Designated Contracting States: |
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DE FR GB NL |
(30) |
Priority: |
19.03.1996 JP 6236696 18.11.1996 JP 30540596
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(43) |
Date of publication of application: |
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24.09.1997 Bulletin 1997/39 |
(73) |
Proprietor: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
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Kadoma-shi, Osaka-fu (JP) |
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(72) |
Inventors: |
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- Mifune, Tatsuo,
c/o Matsushita El.Ind.Co.Ltd.
Kadoma-shi,
Osaka-fu (JP)
- Sakamoto, Kazunori,
c/o Matsushita El.Ind.Co.Ltd.
Kadoma-shi,
Osaka-fu (JP)
- Ohata, Tsumoru,
c/o Matsushita El.Ind.Co.Ltd.
Kadoma-shi,
Osaka-fu (JP)
- Watanabe, Masaru,
c/o Matsushita El.Ind.Co.Ltd.
Kadoma-shi,
Osaka-fu (JP)
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(74) |
Representative: Grünecker, Kinkeldey,
Stockmair & Schwanhäusser
Anwaltssozietät |
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Maximilianstrasse 58 80538 München 80538 München (DE) |
(56) |
References cited: :
WO-A-96/15548 FR-A- 2 073 857 GB-A- 2 064 217
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DD-A- 102 010 FR-A- 2 146 800 GB-A- 2 268 622
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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Field of the Invention
[0001] The present invention relates to a light-screening film paint for lamps, and to a
method for producing a light-screening film having the features of the preambles of
claims 1 and 13, respectively.
Background of the Invention
[0002] A film paint and a method having the features of the preambles of claims 1 and 13,
respectively, are known from both prior art documents DD-A-102 010 and of EP-A-0 739
534, which is relevant pursuant to Articles 54(3) and (4) EPC.
[0003] FIG. 1 shows a structural drawing of a highly luminous D2R-type discharge lamp for
automobile front lamp. The discharge lamp for automobiles is so arranged as that a
metal iodide sealed in a quartz emissive section 5 emits a light under application
of a high tension between the metal tungsten electrodes 1a and 1b. The emissive section
5 is covered with an external quartz tube 2. As compared with a halogen lamp chiefly
employed at present as front lamp for automobiles, this halogen lamp is advantageous
in providing a threefold luminosity at a 70% consumed power. Beside, because of using
no filament unlike halogen lights, the service life is very long and not shorter than
1,500 hours.
[0004] In this discharge lamp, a light-screening film 4 is formed on the surface of a outer
quartz tube 2 to control the project region of light. This light-screening film is
about 20 µm thick, the shape and size of which are specified in according with the
International Standard. The present invention refers also to a producing method for
this light-screening film.
[0005] Using ferric oxide or cupric oxide as pigment and sodium silicate or aluminum phosphate
as binder, a conventional light-screening film for lamps has been formed by mixing
a pigment and a binder to form a paint, applying this paint to the glass surface of
a lamp and firing the coat at a temperature of 100°C to 250°C
[0006] On lighting a lamp, the temperature of the glass surface of a lamp rises and accordingly
that of the light-screening film formed thereon also rises. Especially with a highly
luminous discharge lamp for automobiles, the temperature of the glass surface of the
lamp rises to about 700°C during the lighting and necessarily the light-screening
film on the glass surface is also exposed to a temperature of 700°C.
[0007] As mentioned above, a light-screening film according to the prior art uses ferric
oxide or the like as pigment. Though being black at room temperature, cupric oxide
is known to turn into red powder with the progress of oxidation at about 350°C.
[0008] Thus, if a light-screening film was formed on a highly luminous discharge lamp for
automobiles according to the prior art, there has happened a phenomenon that the color
of the light-screening film changes from black to red or white due to a rise in temperature
during the lighting. When the color of the light-screening film turns from black to
red or white, the absorbance of light changes, thereby leading to a decline in light-screening
performance, which has given rise to troubles. Discoloration of a light-screening
film leads not only to a decline in light-screening performance but a bad appearance
of the lamp impressed on a user and accordingly has been a serious problem. Thus,
a light-screening film material has been desired which undergoes no discoloration
for a 1,500-hours period of lighting.
[0009] Besides, if a light-screening film was formed on a highly luminous discharge lamp
for automobiles according to the prior art, there has been another problem that a
heat cycle comprising ups and downs of temperature due to the repetition of lighting
and extinction of a lamp causes a cracking or peeling of the light-screening film,
thereby resulting in loss of light-screening performance. Also regarding this problem,
a light-screening film material free of occurrence of cracking or peeling due to lighting
and extinction over 1,500 hours has been desired.
Disclosure of the Invention
[0010] In order to solve these problems, the present invention employs a light-screening
film paint according to claim 1 and a method according to claim 13. Preferred embodiments
are disclosed in the dependent claims.
[0011] After a tentative drying process subsequent to the application of a paint, a paint
film is formed on the glass surface by binder action of methyl cellulose, vinyl alcohol
and acrylic resin. Besides, methyl cellulose functions to inhibit the sedimentation,
coagulation or separation of pigment powder in a paint, whereby the paint can be stabilized
by adding 0.2 to 2 parts thereof to 100 parts of powder quantity. By setting the solid
fraction in the paint to not less than 40 % by weight, dry contraction or liquid dripping
after the application of a paint can be suppressed, thereby enabling a high precision
light-screening film pattern to be formed.
[0012] And preferably, by adding 0.2 to 2 parts of either silica having a primary grain
size of not greater than 100 nm or clay mineral containing silica to 100 parts of
powder quantity, thixotropy can be afforded to a paint, so that a stable application
of the paint by using a coater becomes possible.
[0013] During the firing at a temperature not higher than 150°C, methyl cellulose, vinyl
alcohol and acrylic resin are thermally decomposed and consequently their residue
in the paint film vanishes. During the firing at a temperature not higher than 1500°C,
powder glass contained in the paint melts and functions as a binder. More preferably,
by using glass mainly comprising zinc oxide and silica as powder glass, a light-screening
film is obtained which has a high adhesion strength to the surface of quartz glass.
And more preferably, by using powder glass having a melting point of not higher than
1000°C and setting the firing temperature at not higher than 1000°C, the deterioration
of lamp performance can be prevented.
[0014] More preferably, by using powder glass having a thermal expansion coefficient not
higher than 10
-6, the difference in thermal expansion coefficient from a quartz glass tube decreases
and the peeling of a light-screening film due to local ups and downs of temperature
caused by the lighting and extinction of a lamp hardly occurs.
[0015] Still more preferably, by using powder glass that will crystallize under a temperature
not lower than 600°C, the deterioration of light-screening film strength due to a
rise in temperature caused by the lighting of a lamp after the firing can be prevented.
[0016] By allowing the firing to proceed under the nitrogen atmosphere, or under the inert
atmosphere, or under the vacuum atmosphere of not more than 10
-2 Torr, the metal electrode material for a main lamp body is kept from being oxidized,
so that a light-screening film can be formed without deterioration of the lamp performance.
Brief Description of the Drawings
[0017]
FIG. 1 is an outside view of a discharge lamp;
FIG. 2 is an illustration of the measured results of discoloration degree for a light-screening
film according to the present invention and a conventional light-screening film;
FIG. 3 is a table showing the mixing ratios in the mixture of manganese oxide powder
and manganese-contained iron oxide powder and the estimation results of obtained light-screening
films;
FIG. 4 is a table showing the manganese contents of manganese-contained iron oxide
powder and the estimation results of obtained light-screening films;
FIG. 5 is a table showing the softening points of powder glass and the estimation
results of obtained light-screening films;
FIG. 6 is a table showing the added amounts of clay mineral containing silica and
the estimation results of obtained paints; and
FIG. 7 is a talbe showing the added amounts of methyl cellulose and the estimation
results of obtained light-screening paints.
Detailed Description of the Preferred Embodiments
[0018] Next, one embodiment of the present invention will be described.
[0019] 100g of manganese oxide having a grain size distribution of 1
µm to 20µm, 100g of iron oxide powder containing about 20 % by weight of manganese
added for obtaining iron oxide from iron hydroxide and having a grain size distribution
of 0.3
µm to 3
µm, and 100g of powder glass containing about 70 % by weight of zinc oxide, aluminum
oxide and silica were dry-mixed in an agate mortar for one hour to make a mixture.
The powder glass employed is one which melts at about 700°C and crystallizes as the
temperature is raised up to 750°C.
[0020] Then, 300g of water containing 3% by weight of methyl cellulose and the above mixture
were mixed in a disper mill, and the powder obtained was dispersed into water by a
high-speed disperser. The mixing was performed at a surface speed of the high-speed
disperser being not lower than 5m/s. The solid ratio of a paint was set to 50% by
weight. And by adding one part of silica powder having a grain size of not larger
than 100nm to 100 parts of powder component and dispersing it, a good thixotropy can
be afforded to the coating.
[0021] The light-screening film paint prepared in this way was applied to the quartz glass
surface of a lamp by means of a coater and fired at 800°C for an hour after transient
drying at 100°C. Firing was conducted under the vacuum atmosphere of 1 x 10
-4 Torr.
[0022] The light-screening film formed in this way on the glass surface of a highly luminous
discharge lamp has a high adhesion strength to the lamp and the color of the whole
film was black.
[0023] The light-screening film obtained was estimated by discoloration measurement after
the lighting, film strength measurement, transmissibility measurement, and surface
observation after the lighting.
[0024] And, a change in the color of a light-screening film was measured with a chroma meter
and estimated in accordance with the Lab method. From changes in the respective values
of L, a and b, ΔEab was calculated. The passable levels for estimation were set at
a ΔEab value determined to be not greater than 1, calculated from measurements of
the color of a light-screening film before lighting and after an 1,500-hours duration
of lighting.
[0025] The film strength, determined by the cross cut test according to the JIS (Japanese
Industrial Standards) Z 1522, was examined respectively before lighting and after
an 1,500-hours duration of lighting. A light-screening film was cut into specimens
with a diamond cutter and tapes were pasted to the respective specimens and peeled.
The peeling degree of the light-screening film observed at that time was examined.
Only those in which no peeling whatever was observed were determined as the passable
level.
[0026] The passable level for transmittance measurements was taken at a leaking light ratio
of not greater than 0.5%.
[0027] FIG. 2 shows the result of discoloration measurements of the light-screening film
obtained in the above embodiment. A light-screening film according to the present
invention has a much smaller degree of discoloration than that of a conventional one
using cupric oxide as pigment and manifested a ΔEab value of not greater than 1 after
an 1,500-hours duration of lighting.
[0028] In the above embodiment, 67 parts by weight of powder glass mainly containing zinc
oxide was mixed to 100 parts in total of the mixture of manganese oxide powder and
iron oxide powder containing about 20% by weight of manganese to prepare a paint,
but light-screening films equivalent to the one obtained in the above embodiment were
obtained also at other ratios.
[0029] FIG. 3 shows mixing ratios of the mixture of manganese oxide powder and iron oxide
powder containing about 20% by weight of manganese to powder glass mainly containing
zinc oxide, and the estimation results of the obtained light-screening films. This
result revealed that a good light-screening film can be obtained by mixing 30 to 100
parts of powder glass mainly containing zinc oxide with 100 parts of the mixture of
manganese oxide powder and manganese-contained iron oxide powder.
[0030] In the above embodiment, the manganese content in manganese-contained iron oxide
was 20%, but results similar to the one obtained in the above embodiment were obtained
also at other ratios. FIG. 4 shows these results. From FIG. 4 the most appropriate
content of manganese was found to range from 5 mol% to 30 mol%.
[0031] In the above embodiment, powder glass mainly containing zinc oxide was employed,
but powder glass mainly comprising any of zinc oxide or boron oxide or aluminum oxide
or silica provided a light-screening film equivalent to the one obtained in the above
embodiment.
[0032] On using powder glass containing a great amount of alkaline metal or alkaline earth
metal, no good result was obtained because it reacted to cause an external quartz
glass tube to be devitrifed.
[0033] In the above embodiment, powder glass that begins to melt at 700°C and is crystallized
at 750°C was employed, but a light-screening films equivalent to the one obtained
in the above embodiment were obtained for powder glass having other softening points.
FIG. 5 shows these results. To allow glass to melt sufficiently, the firing temperature
was set to the softening temperature plus 100°C. From FIG. 5 it proved appropriate
that the melting point of the powder glass employed ranges from 600°C to 1,100°C,
both inclusive, and the firing temperature is not higher than 1,200°C.
[0034] And with respect to adhesion strength of a film, using glass to be crystallized with
elevating temperature provides a rather preferred result.
[0035] In the above embodiment, thixocity was afforded to a paint by adding one part of
silica powder having a grain size of not greater than 100nm to 100 parts of powder
quantity, but equivalent results were obtained also on using swelling clay minerals
such as smectite containing silica in place of silica powder. The powder quantity
referred to here is the total quantity of a mixture comprising manganese oxide and
manganese contained iron oxide and powder glass.
[0036] Silica powder having a larger grain size that 100nm provides no desired effect.
[0037] A most appropriate added amount of silica powder depends on a coater or a desired
thickness, but the results examined in the present invention are shown in FIG. 6.
FIG. 6 revealed that 0.2 part to 2 parts of added amount to 100 parts of powder quantity
is suitable for the attainment of a stable coating by the prevention of liquid dripping
or the like. FIG. 6 shows the results examined on swelling clay minerals containing
silica, but equivalent results were obtained also for silica powder having a grain
size of not greater than 100nm.
[0038] In the above embodiment, methyl cellulose was employed, but equivalent paints were
obtained also on using vinyl alcohol or acrylic resin in place of this.
[0039] FIG. 7 shows the results of correspondence between the added amount of methyl cellulose.
The results of FIG. 7 revealed that the added amount of methyl cellulose is preferably
0.2 to 2 parts to 100 parts of powder quantity. FIG. 7 shows the results in the case
of methyl cellulose, but equivalent results were obtained also on using vinyl alcohol
or acrylic resin in place of this.
[0040] In the above embodiment, firing was conducted in the atmosphere of 1 x 10
-4 Torr. As a result of examinations on the degree of vacuum, firing in the vacuum atmosphere
of not lower than 1 x 10
-2 Torr provided no favorable result because the tungsten electrode section of the lamp
of FIG. 1 was oxidized. Thus, the degree of vacuum was found to be preferably not
higher than 1 x 10
-2 Torr.
[0041] According to the present invention, as described above, a favorable effect in a light-screening
film formed on the glass surface of a highly luminous discharge lamp was obtained
that the adhesion strength to a lamp is strong, the color of the whole film is black
and neither peeling nor discoloration of the light-screening film occurs even after
a 200-hours duration of lighting.
1. A light-screening film paint for lamps comprising:
at least one compound of either manganese oxide or iron oxide; and
powder glass containing at least one of compounds respectively of silica, zinc oxide,
boron oxide and aluminum oxide,
characterized in that
said compound contains 5 mol% to 30 mol% of manganese.
2. A light-screening film paint for lamps as set forth in claim 1,
characterized by
a compound of manganese oxide, iron oxide and zinc oxide; and
glass containing at least one compound respectively of silica, zinc oxide, boron oxide,
and aluminum oxide.
3. A light-screening film paint for lamps as set forth in claim 1, wherein water is employed
as solvent.
4. A light-screening film paint for lamps as set forth in claim 1, further comprising
at least one of compounds respectively of methyl cellulose, vinyl alcohol, and acrylic
resin.
5. A light-screening film paint for lamps as set forth in claim 1, wherein silica having
a primary grain size of not greater than 100 nm is added.
6. A light-screening film paint for lamps as set forth in claim 1, wherein clay mineral
containing silica having a primary grain size of not greater than 100 nm is added.
7. A light-screening film paint for lamps as set forth in claim 1, wherein the solid
fraction is not smaller than 40 % by weight.
8. A light-screening film paint for lamps as set forth in claim 1, wherein the melting
point of powder glass is not higher than 1,200°C.
9. A light-screening film paint for lamps as set forth in claim 4, wherein the amount
of the compound of at least one of methyl cellulose, vinyl alcohol and acrylic resin
ranges from 0.2 part to 2 parts relative to 100 parts of powder quantity.
10. A light-screening film paint for lamps as set forth in claim 1, wherein the thermal
expansion coefficient of the powder glass is not higher than 10-6.
11. A light-screening film paint for lamps as set forth in claim 1, wherein the powdered
glass to be crystallized by heating is employed as powder glass for preparing said
light-screening film paint.
12. A light-screening film paint for lamps as set forth in claim 1, wherein relative to
100 parts of at least one compound of either manganese oxide or iron oxide containing
5 mol% to 30 mol% of manganese, the mixing ratio of said powder glass containing at
lest one of the compounds respectively of silica, zinc oxide, boron oxide, and aluminum
oxide ranges from 30 parts by weight to 100 parts by weight.
13. A method for producing a light-screening film (4) for lamps, comprising the steps
of:
preparing a light-screening paint for lamps; said light-screening paint comprises
at least one compound of either manganese oxide or iron oxide and moreover powder
glass containing at least one compound, respectively, of silica, zinc oxide, boron
oxide and aluminum oxide.
applying the above paint to the surface of a lamp,
forming a light-screening film (4) by firing at not higher temperatures than 1200°C,
characterized in that
said compound contains 5 mol% to 30 mol% of manganese.
14. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein water is employed as solvent.
15. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein added to said light-screening film paint is a compound of at least one of
methyl cellulose, vinyl alcohol and acrylic resin.
16. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein silica having a primary grain size of not greater than 100 nm is added.
17. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein clay mineral containing silica having a primary grain size of not greater
than 100 nm is added.
18. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein the solid fraction is not smaller than 40 % by weight.
19. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein the melting point of powder glass is not higher than 1,200°C.
20. A producing method of a light-screening film 4 for lamps as set forth in claim 15,
wherein the amount of the compound of at least one of methyl cellulose, vinyl alcohol
and acrylic resin ranges from 0.2 part to 2 parts relative to 100 parts of powder
quantity.
21. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein the firing of said paint is allowed to proceed in the vacuum atmosphere of
not more than 10-2 Torr.
22. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein the thermal expansion coefficient of the powder glass is not higher than 10-6.
23. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein the powder glass to be crystallized by heating is employed as powder glass
for preparing said light-screening film paint.
24. A producing method of a light-screening film 4 for lamps as set forth in claim 13,
wherein relative to 100 parts of at least one compound of either manganese oxide or
iron oxide containing 5 mol% to 30 mol% of manganese, the mixing ration of said powder
glass containing at least one of the compounds respectively of silica, zinc oxide,
boron oxide and aluminum oxide ranges from 30 parts by weight to 100 parts by weight.
1. Licht abschirmender Filmanstrich für Lampen, welcher umfasst:
wenigstens eine Verbindung von entweder Manganoxid oder Eisenoxid; und
Glaspulver, das wenigstens eine der Verbindungen Siliciumdioxid, Zinkoxid, Boroxid
bzw. Aluminiumoxid enthält,
dadurch gekennzeichnet, dass
die Verbindung 5 Mol-% bis 30 Mol-% Mangan enthält.
2. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1,
gekennzeichnet durch
eine Verbindung von Manganoxid, Eisenoxid und Zinkoxid; und
Glas, das wenigstens eine Verbindung von Siliciumdioxid, Zinkoxid, Boroxid bzw. Aluminiumoxid
enthält.
3. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem Wasser als Lösungsmittel
verwendet wird.
4. Licht abschirmender Filmanstrich nach Anspruch 1, der ferner wenigstens eine der Verbindungen
Methylcellulose, Vinylalkohol bzw. Acrylharz umfasst.
5. Licht abschirmender Filmanstrich nach Anspruch 1, bei dem Siliciumdioxid mit einer
primären Korngröße von nicht mehr als 100 nm hinzugefügt ist.
6. Licht abschirmender Filmanstrich nach Anspruch 1, bei dem ein Tonmineral hinzugefügt
wird, das Siliciumdioxid mit einer primären Korngröße von nicht mehr als 100 nm enthält.
7. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem der Feststoffanteil
nicht weniger als 40 Gew.-% beträgt.
8. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem der Schmelzpunkt
des Glaspulvers nicht mehr als 1.200°C beträgt.
9. Licht abschirmender Filmanstrich nach Anspruch 4, bei dem die Menge der Verbindung
von wenigstens einer von Methylcellulose, Vinylalkohol und Acrylharz im Bereich von
0,2 Teilen bis 2 Teile bezogen auf 100 Teile Pulvermenge liegt.
10. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem der Wärmeausdehnungskoeffizient
des Glaspulvers nicht höher als 10-6 liegt.
11. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem das durch Erhitzen
zu kristallisierende pulverisierte Glas als Glaspulver zur Herstellung des Licht abschirmenden
Filmanstrichs verwendet wird.
12. Licht abschirmender Filmanstrich für Lampen nach Anspruch 1, bei dem bezogen auf 100
Teile wenigstens einer Verbindung von entweder Manganoxid oder Eisenoxid, die wenigstens
5 Mol-% bis 30 Mol-% Mangan enthält, das Mischungsverhältnis des Glaspulvers, das
wenigstens eine der Verbindungen Siliciumdioxid, Zinkoxid, Boroxid bzw. Aluminiumoxid
enthält, im Bereich von 30 Gewichtsteilen bis zu 100 Gewichtsteilen liegt.
13. Verfahren zur Herstellung eines Licht abschirmenden Films (4) für Lampen, das die
Schritte umfasst:
Herstellen eines Licht abschirmenden Anstrichs für Lampen; wobei der Licht abschirmende
Anstrich wenigstens eine Verbindung von entweder Manganoxid oder Eisenoxid und darüber
hinaus Glaspulver umfasst, das wenigstens eine Verbindung von Siliciumdioxid, Zinkoxid,
Boroxid bzw. Aluminiumoxid enthält,
Aufbringen des obigen Anstrichs auf die Oberfläche einer Lampe,
Ausbilden eines Licht abschirmenden Films (4) durch Brennen bei Temperaturen, die
nicht höher als 1200°C liegen,
dadurch gekennzeichnet, dass
die Verbindung 5 Mol-% bis 30 Mol-% Mangan enthält.
14. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem Wasser als Lösungsmittel verwendet wird.
15. Herstellungsverfahren für einen Licht abschirmenden Film (4) nach Anspruch 13, bei
dem dem Licht abschirmenden Filmanstrich eine Verbindung von wenigstens einer von
Methylcellulose, Vinylalkohol bzw. Acrylharz hinzugefügt wird.
16. Herstellungsverfahren für einen Licht abschirmenden Film (4) nach Anspruch 13, bei
dem Siliciumdioxid mit einer primären Korngröße von nicht mehr als 100 nm hinzugefügt
wird.
17. Herstellungsverfahren für einen Licht abschirmenden Film (4) nach Anspruch 13, bei
dem ein Tonmineral hinzugefügt wird, das Siliciumdioxid mit einer primären Korngröße
von nicht mehr als 100 nm enthält.
18. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem der Feststoffanteil nicht weniger als 40 Gew.-% beträgt.
19. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem der Schmelzpunkt des Glaspulvers nicht mehr als 1.200°C beträgt.
20. Herstellungsverfahren für einen Licht abschirmenden Film (4) nach Anspruch 15, bei
dem die Menge der Verbindung von wenigstens einer von Methylcellulose, Vinylalkohol
und Acrylharz im Bereich von 0,2 Teilen bis 2 Teile bezogen auf 100 Teile Pulvermenge
liegt.
21. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem dem Brennen des Anstrichs gestattet wird in einer Unterdruckatmosphäre
von nicht mehr als 10-2 Torr vonstatten zu gehen.
22. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem der Wärmeausdehnungskoeffizient des Glaspulvers nicht höher als 10-6 liegt.
23. Herstellungsverfahren für einen Licht abschirmenden Film (4) für Lampen nach Anspruch
13, bei dem das durch Erhitzen zu kristallisierende pulverisierte Glas als Glaspulver
zur Herstellung des Licht abschirmenden Filmanstrichs verwendet wird.
24. Herstellungsverfahren für einen Licht abschirmenden Film 4 für Lampen nach Anspruch
13, bei dem bezogen auf 100 Teile wenigstens einer Verbindung von entweder Manganoxid
oder Eisenoxid, die wenigstens 5 Mol-% bis 30 Mol-% Mangan enthält, das Mischungsverhältnis
des Glaspulvers, das wenigstens eine der Verbindungen Siliciumdioxid, Zinkoxid, Boroxid
bzw. Aluminiumoxid enthält, im Bereich von 30 Gewichtsteilen bis zu 100 Gewichtsteilen
liegt.
1. Peinture en film opaque à la lumière, destinée à des lampes, comprenant :
au moins un composé parmi, soit un oxyde de manganèse, soit un oxyde de fer, et
du verre en poudre contenant au moins l'un des composés respectivement de silice,
d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium,
caractérisée en ce que
ledit composé contient 5 % en moles à 30 % en moles de manganèse.
2. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1,
caractérisée par
un composé d'oxyde de manganèse, d'oxyde de fer et d'oxyde de zinc, et
un verre contenant au moins un composé respectivement de silice, d'oxyde de zinc,
d'oxyde de bore et d'oxyde d'aluminium.
3. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle l'eau est employée comme solvant.
4. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, comprenant en outre au moins l'un des composés parmi la méthylcellulose, l'alcool
vinylique et une résine acrylique, respectivement.
5. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle de la silice présentant une taille de grain principale, qui n'est
pas supérieure à 100 nm, est ajoutée.
6. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle un minéral d'argile contenant de la silice présentant une taille
de grain principale, qui n'est pas supérieure à 100 nm, est ajouté.
7. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle la fraction solide n'est pas inférieure à 40 % en poids.
8. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle le point de fusion du verre en poudre n'est pas supérieur à 1 200
°C.
9. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
4, dans laquelle la quantité du composé d'au moins l'un parmi la méthylcellulose,
l'alcool vinylique et une résine acrylique va de 0,2 partie à 2 parties par rapport
à 100 parties de la quantité de poudre.
10. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle le coefficient de dilatation thermique du verre en poudre n'est pas
supérieur à 10-6.
11. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle le verre réduit en poudre, devant être cristallisé par chauffage,
est employé en tant que verre en poudre en vue de préparer ladite peinture en film
opaque à la lumière.
12. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication
1, dans laquelle par rapport à 100 parties d'au moins un composé parmi, soit un oxyde
de manganèse, soit un oxyde de fer, contenant 5 % en moles à 30 % en moles de manganèse,
le rapport de mélange dudit verre en poudre contenant au moins l'un des composés respectivement
de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium, va de 30 parties
en poids à 100 parties en poids.
13. Procédé de fabrication d'un film opaque à la lumière (4) destiné à des lampes, comprenant
les étapes suivantes :
préparation d'une peinture opaque à la lumière destinée à des lampes, ladite peinture
opaque à la lumière comprend au moins un composé parmi, soit un oxyde de manganèse,
soit un oxyde de fer et en outre du verre en poudre contenant au moins un composé,
respectivement, de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium,
application de la peinture ci-dessus sur la surface d'une lampe,
formation d'un film opaque à la lumière (4) par cuisson à des températures qui ne
sont pas supérieures à 1 200 °C,
caractérisé en ce que
ledit composé contient 5 % en moles à 30 % en moles de manganèse.
14. Procédé de fabrication d'un film opaque à la lumière 4 destiné à des lampes, selon
la revendication 13, dans lequel l'eau est employée comme solvant.
15. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel un composé d'au moins l'un parmi la méthylcellulose,
l'alcool vinylique et une résine acrylique est ajouté à ladite peinture en film opaque
à la lumière.
16. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel de la silice présentant une taille de grain principale
qui n'est pas supérieure à 100 nm est ajoutée.
17. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel un minéral d'argile contenant de la silice présentant
une taille de grain principale qui n'est pas supérieure à 100 nm est ajouté.
18. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel la fraction solide n'est pas inférieure à 40 % en
poids.
19. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel le point de fusion du verre en poudre n'est pas supérieur
à 1 200 °C.
20. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 15, dans lequel la quantité du composé d'au moins l'un parmi la méthylcellulose,
l'alcool vinylique et une résine acrylique va de 0,2 partie à 2 parties par rapport
à 100 parties de la quantité de poudre.
21. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel la cuisson de ladite peinture est mise à se poursuivre
dans une atmosphère de vide qui n'est pas supérieure à 10-2 Torr.
22. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel le coefficient de dilatation thermique du verre en
poudre n'est pas supérieur à 10-6.
23. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel le verre en poudre devant être cristallisé par chauffage
est employé en tant que verre en poudre en vue de préparer ladite peinture en film
opaque à la lumière.
24. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon
la revendication 13, dans lequel par rapport à 100 parties d'au moins un composé parmi,
soit un oxyde de manganèse, soit un oxyde de fer, contenant 5 % en moles à 30 % en
moles de manganèse, le rapport de mélange dudit verre en poudre contenant au moins
l'un des composés respectivement de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde
d'aluminium, va de 30 parties en poids à 100 parties en poids.