KR100531045B1 - Amber vehicle lamp - Google Patents

Abstract

The yellow vehicle lamp 10 comprises a lamp bulb and a yellow coating 12 with a colorant comprising a silicone polyester resin and yellow iron oxide and yellow anthraquinone. The yellow coating further comprises a silane binder. The yellow vehicle lamp 10 provides a yellow color that meets the ECE specification and has a coating endurance of 96% color at 70 ° C. of the lamp life. The colorant has a particle size of 0.01 micron or less, which gives a yellow bulb.

Description

Car yellow lamps {AMBER VEHICLE LAMP}

FIELD OF THE INVENTION The present invention relates to electric lamps for use in vehicles, and more particularly to polymer coating of automotive signal lamps.

Automotive yellow lamp bulbs are commonly used as traffic lights in vehicles. In general, yellow bulbs are made of cadmium dope glass and exhibit yellow color. Cadmium is an unacceptable material due to environmental issues, and the market now needs a complete alternative to the environment. Lamps coated with various colors have been developed and can accommodate their initial colors. In ambient operating conditions that can be specifically expected for the subject vehicle, the bulb face is in the range of -40 to 350 ° C. and therefore has an internal temperature, making it difficult to achieve durability. Practically, the color, or the adhesion of the existing coating, or both, is not good over time. The elapsed time of the automatic signal lamp can be quite long, while the practical "on" time is substantially short. By operating the signal lamp for only a few minutes while the vehicle is operating, the appearance life of the lamp may be substantially maintained for one year or more even if the lamp is operated cumulatively for tens or hundreds of hours. It is also known that during prolonged use of the lamp, the coating is peeled off or converted to dust peeled off from the bulb. Similarly, the color will also fade, so the lamp color will deviate from the required color. Thus, there is a need for a yellow bulb coating that exhibits a standard color to give a continuous color.

1 is a perspective view of a preferred embodiment of a yellow lamp for automobiles.

2 is a perspective view of another preferred embodiment of a yellow lamp for automobiles.

3 is a perspective view of another preferred modified embodiment of an amber lamp for an automobile.

4 is a cross-sectional view of a partially cut coating lamp envelope.

5 shows a valid overtime chart of coloring in color coordinates.

The durable yellow colored lamp of the present invention is to form a lamp bulb having a coating formed of silane, transparent silicone-polyester resin, yellow iron oxide and yellow anthraquinone.

1 is a perspective view of a preferred embodiment of an automobile yellow lamp. Like numbers in the drawings and specification indicate like or corresponding parts. An automobile yellow lamp 10 is assembled into a lamp bulb consisting of a coating 12 comprising a transparent silicone-polyester resin, yellow iron oxide, and yellow anthraquinone. Silane binders may optionally be contained in the polyester resin. 2 is a perspective view of another preferred embodiment of a yellow lamp for automobiles. 3 is a perspective view of another preferred modified embodiment of a yellow lamp for automobiles. 4 shows a cross section of a partially cut coating lamp envelope. The yellow coating 12 covers approximately all of the photoelectric areas of the glass 14 of the bulb.

Preferred incandescent bulbs are S-8, compression sealed spherical bulbs generally known in the industry. The bulb is made of SG10 type glass with a diameter of about 1 inch, although other glass may be used, including unleaded glasses. Electricity is supplied to the filament through two leads that are sealed through a compression seal. Likewise, two filament, four lead bulbs are generally made and similarly coated. The base is attached to the pressure sealing zone to provide proper mechanical coupling and electrical connection of the bulb. There are many known base designs, and the specially selected base designs will be affected by the design choice problem.

Apart from yellow, a generally transparent yellow coating 12 is coated on the bulb exterior. The yellow coating is one comprising a transparent silicone-polyester polymer and a coloring compound with yellow iron oxide and yellow anthraquinone. Preferred coatings have 5.0% yellow iron oxide, 5.0% yellow anthraquinone, and the balance of silicone-polyester resin as weight component ratios. Optionally, the silane binder of 0.5% by weight silane may be contained in the silicone-polyester.

Preferred transparent resins are highly silicone containing polymers and in particular highly silicone silicone-polyester type polymer resins. The application uses a highly silicon containing polymer available as silicophthal HTT from Tego Chemie Service GmbH.

Preferred silane materials (selectivity) comprise silicone-polyester crosslinkers. Applicant used a known silane with a polyester crosslinker containing gamma methacryloxypropyltrimethoxyoxylene available as Z-6030 from Dow Corning Corporation. The silane material may be added separately from the silicone-polyester resin or mixed. Recent test procedures indicate that the coating composition containing the silane material achieves the existing specifications while the same composition without the silane results in significant durability. Compositions containing silanes are now considered to be less preferred alternatives.

The solvent is mixed with a sufficient amount of colorant, silane (selectivity) and resin to form a fluid coating with viscosity suitable for the selected application form. One method of applying the coating is to submerge the lamp. Applicants preferred spraying, so it is necessary to dilute the mixture sufficiently with a solvent to produce a sprayable fluid. Preferred polymer solvents are acetone, but other such as methoxypropylacetate may be used.

Preferred colorants are mixtures of yellow iron oxide and anthraquinones. Preferred anthraquinones are the filester yellow RNBs from Ciba Specialty Chemicals, and the more specific formula 9,10-anthracenedione, 1, 1 '-{(6-phenyl-1,3,5 -Triazine-2,4 diyl) diimino} bis-. Colorants are prepared having a particle size of 0.01 μm or less. Particle sizes of very small size can form transparent bulbs that are still yellow.

The yellow iron oxide colorant is dissipated in an intermediate grinder using a solvent and polished to a small size. The anthraquinone is again dissipated separately using an intermediate polisher and polished to a small size (particle size 0.01 μm or less). The two colorants are then combined in the polishing machine and polished together. The two colorants are mixed thoroughly. Silane (selectivity) and silicone polyester resin are added using a planetary mixer. Solvents are added to achieve a viscosity suitable for the selected form of the application. Immediately after mixing, the resulting mixture need not necessarily exhibit a suitable yellow color. However, the resulting mixture is ready for application to the clear glass lamp side.

Applicants' coatings are prefabricated with transparent lamp bulbs. The bulb selected is known as the 3157 S-8 wedge. The bulb is held by its base so that the bulb part faces downward and the base and the electrical connection are shielded with an arbitrary spray. This fact leaves behind the light transmitting portion of the exposed bulb. The exposed glass portion of the bulb is then sprayed up the bulb side with the coating mixture at ambient temperature leaving a thin fluid coating. Optionally, the exposed glass portion may be immersed in the coating (bulb down) and may cause excessive coating to fall off. In both cases, the applied viscosity is such that the applied coating leaves a uniform thin layer of approximately 0.0127 mm (5.010 ^-4 inch). The weighing variation is about 0.0015 mm (5.010 ^-5 inch). This thickness is sufficient for light to be emitted from the bulb in yellow corresponding to the ECE specification for the yellow signal lamp of the vehicle.

The coating bulb is then baked at 250-300 ° C. for 15 minutes in a dust free atmosphere to form a yellow colored polymer layer. During the baking process, a number of events occur. The colored coating layer is bonded to the glass. The yellow iron oxide is changed from FeOOH to Fe ₃ O ₂ and combined with a yellow anthraquinone pigment to give the required yellow color. The silicone polyester polymer is crosslinked around the colorant particles and traps them in the composite network of resin material. Baking also drains other residual solvents.

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The final coated bulb was examined and found to have the following characteristics. The bulb has a thin, hard and transparent yellow coating. The yellow color meets the SAE and ECE color arrangement requirements for the yellow traffic light of the vehicle. In particular, when the bulb is on, yellow light is produced at the color coordinates (X, Y) in the 1931 CIE chromaticity region, where a) 0.398 (red boundary) is less than or equal to Y, and b) Y is Less than or equal to 0.429 (green border), and c) 0.893-X is less than or equal to Y (white border). The coated bulb under test (with silane) is operated continuously for 840 hours. This is 70% for 1200 hours of life of the 3157 S-8 wedge bulb. The coated (with silane) bulbs have a perfect coating adhesion and have a color retention of 96% measured by the spherical integration method. The coated (with silane) bulb is expected to have 94.3% color retention at 100% bulb life.

5 shows a chart of the effect on fading time on color coordinates. In this test, the bulb is believed to be exposed to 90 normal operating environments per second for 1315 hours. The initial color coordinates are (0.579, 0.415) and after 1315 hours the color is shifted to (0.573, 0.422). The initial and last coordinates are in the EC (area 16) and SAE (area 18) formed as areas for yellow. Coated bulbs not coated with silane or coated with silane are inspected according to a 24-hour schedule of lamps with varying humidity and heat. In summary, the temperature during the test varies from -40 to 80 ° C. and the humidity reaches a maximum of 93%. On the other hand, the lamp is turned on and off according to the schedule. The coated lamp achieves 10 cycles of B10 (90% success, 10% failure). The silane coated bulb passes through about 10 or 12 cycles of B10. Bulbs not coated with silane achieve 18 cycles of B10. Coating bulbs have been found to have better yellow and longer color retention than any coated product known in the art. The operating conditions, dimensions, shapes, etc. described are merely exemplary, and other forms may be used in the present invention.

The present invention has been described with reference to the preferred embodiments, and is not limited thereto, and one of ordinary skill in the art should recognize that various modifications and changes can be made to the present invention without departing from the appended claims.

Claims (20)

For yellow coated incandescent bulbs, An incandescent bulb having a light-transmitting glass envelope, And said yellow coated envelope comprises a transparent silicone polyester polymer and a colorant comprising yellow iron oxide and yellow anthraquinone. The yellow coated incandescent bulb of claim 1, further comprising a silane binder. 2. The yellow coated incandescent bulb of claim 1, wherein said color has a yellow color in the 1931 CIE chromocity region formed by 0.398 = <y = <0.429 and 0.993 <x = <Y. 3. The yellow coated incandescent bulb of claim 2, wherein the silane comprises gamma methacryloxypropyltrimethoxysilane. The yellow coated incandescent bulb of claim 1, wherein the silane polyester resin comprises silicophthal HTT. 2. The yellow coated incandescent bulb of claim 1, wherein the silicone polyester resin comprises acetone as a solvent. 2. The yellow coated incandescent bulb of claim 1, wherein the silicone polyester resin comprises methoxypropyl acetate as a solvent. The compound of claim 1, wherein the anthraquinone comprises the formula 9,10-anthracenedione, 1,1 ′-{(6-phenyl-1, 3, 5-triazine-2, 4 dil) diimino} bis- Yellow coated incandescent bulb, characterized in that. The yellow coated incandescent bulb of claim 1, wherein the yellow iron oxide has a particle size of 0.01 μm or less. The yellow coated incandescent bulb of claim 1, wherein the yellow anthraquinone has a particle size of 0.01 μm or less. An incandescent bulb having a transparent glass envelope, Transparent polysiloxane polyester resin comprising silicophthal HTT, yellow iron oxide with a particle size of 0.01 μm or less, 9,10-anthracenedione, 1,1 ′-{(6-phenyl-1, 3, 5-tree 0.01 μm or less in a film comprising yellow anthraquinone having the formula of azine-2,4-dil) diimino} bis-; and also comprising 5.0% by weight of yellow iron oxide, 5.0% by weight of yellow anthraquinone and the remaining amount of resin Yellow coated incandescent bulb, characterized in that it comprises a yellow coating having a particle size of. 12. The yellow coated incandescent bulb of claim 11, further comprising a silane binder comprising gamma-methacryloxypropyltrimethoxysilane in a 0.5% composition. a) providing a lamp bulb coated with a glass area; b) providing a mixture of yellow iron oxide and yellow anthraquinone with a small average particle size to provide a transparent color coating; c) mixing the transparent silicone polyester resin with yellow iron oxide and yellow anthraquinone; d) additionally including a polymer solvent in the mixture to form a fluid coating material; e) coating the glass regions with a coating material to a thickness through which light from the lamp bulb can pass; And f) heating the coated lamp to cure the resin and substantially remove the solvent to form a colored polymer layer on the lamp. 14. The method of claim 13, wherein the polymer solvent comprises acetone and the coating step is performed by spraying a coating material onto the glass area to be coated. delete 14. The method of claim 13, wherein the coating material is applied to a uniform thickness of 0.0127 mm (0.0005 inch). 15. The method of claim 13, wherein the lamp is heated for 15 minutes at 250 to 300 ℃ in a dust free environment. a) providing a lamp bulb coated with a glass area; b) yellow anthraquinone having the formula 9,10-anthracenedione, 1,1 '-{(6-phenyl-1, 3, 5-triazine-2,4diyl) diimino} bis- at the same weight; Providing a mixture of yellow iron oxides (the mixture having an average particle size of 0.01 μm or less); c) Gamma-methacryloxypropyltrimethoxysilane, silane and gamma, to form a coating material which is 0.5% by weight silane, 5.0% yellow iron oxide, 5.0% yellow anthraquinone and the remaining amount of silicone polyester resin. Mixing the silicone polyester which is methacryloxypropyltrimeth with yellow iron oxide and yellow anthraquinone; d) further comprising acetone in the mixture to form a fluid coating material; e) spraying the coating material onto the glass area to form a coating of uniform thickness of 0.0127 mm (0.0005 inch); And f) a yellow coated lamp comprising heating the sprayed lamp to 250 to 300 ° C. in a dust free environment for 15 minutes to cure the resin and remove the solvent to form a colored polymer layer on the lamp. How to provide bulb. The method of claim 13, wherein the lamp coated in step f) is heated to 250 to 300 ° C. 15. 20. The method of claim 19, wherein the coated lamp is heated for 15 minutes.