Method for manufacturing substrates with transparent and color c

Details Method for manufacturing substrates with transparent and color c Method for manufacturing substrates with transparent and color c

1999-04-26

2000-12-05

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Heating or drying

427106, 427165, 501 19, 501905, B05D 302, B05D 506, C03C 818

Patent

active

061563889

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a method of manufacturing substrates with transparent, colored coatings stable to high temperature and UV, especially (glass) substrates which during their manufacture and/or their use are exposed to high temperatures (e.g., up to 900.degree. C.). Examples of such substrates are, in particular, bulbs for halogen and gas discharge lamps, and corresponding filters.


DESCRIPTION OF THE RELATED ART

Volume-colored glasses are manufactured by introducing colored ions of the 3d elements, by admixing chalcogenides (flash-colored glasses), or by adding noble metals (colloid-colored glasses) (see, for example, W. Vogel, Glaschemie, 3rd Edition, SpringerVerlag, 1992). Because of the inadequate chemical and thermal stability and/or the high costs of the noble metal ions, which are added to the melt in concentrations from 0.003 to 0.1% by mass, such glasses are inappropriate for the manufacture of colored mass products such as (halogen) bulbs, which are produced from silica glass or borosilicate glass.
Colored (colloid-colored) coatings on glass substrates can be obtained by introducing chromophoric metal ions, metal colloids or metal alloy colloids into an Sio.sub.2 or TiO.sub.2 matrix in accordance with the sol-gel technique (see, for example, DE-A-43 38 360 and S. Sakka et al., Proc. SPIE-Int. Soc. Opt. Eng. (1994), 2288 (sol-gel optics III), 108-119). The disadvantages of these described techniques lie, especially in the case of the TiO.sub.2 coatings, in the use as matrix formers of alkoxides which are expensive and are unacceptable from the standpoint of health; furthermore, the drying of the coating is accompanied by the formation of large amounts of solvent vapors owing to the alcohol-based coating sols that are used.
Other options for coloring borosilicate and silica glass substrates are coatings with organic dyes, pigments or interference layers.
To color glass substrates, and especially bulbs, with organic dyes it is common to apply to said bulbs from 0.1 to 15% by weight of the dyes in, for example, an alkyd resin, polyester resin or polyurethane film. Examples of organic dyes that are used are phenoxazines, phenothiazines, triphenylmethane and anthraquinones, which are incorporated, in some cases as alkoxysilyl derivatives, into a tetraethoxysilane(TEOS)/methyltriethoxysilane(MTEOS) matrix and are applied by dip coating (see, for example, JP-A-57/182437). JP-A-04/107260 describes a technique with which yellow colors are applied by means of a pigment (quinophthalone) /SiO.sub.2 coating which is applied by chemical vapor deposition (CVD). JP-A-58/156553 discloses a technique in which the coating of the inside of borosilicate glass lamps with .gamma.-aminopropyl-triethoxysilane and a polyimide resin results in yellow or amber fog lamps. Yellow colorations, for fog lamps, are likewise achieved in accordance with JP-A-06/001635 by incorporating an organic pigment into a TEOS film, although nothing is said about the temperature stability. Pigments in an organic acrylate-urethane matrix lead, after the organic constituents have been burnt out at 780.degree. C., to brownish yellow luster colors, which are not suited to the manufacture of yellow fog lamps (see DE-A-38 19 413). The principal disadvantages of these colorations obtained with organic dyes or pigments lie on the one hand in the complex coating techniques (inside coating, CVD) and, on the other hand, in the sometimes inadequate thermal and UV stability of the organic dyes that are used. A further disadvantage in some cases, once again, lies in the use of the abovementioned expensive alkoxides, which are commonly employed in the form of alcoholic solutions.
Interference colorations are obtained by multiple coating with TiO.sub.2, Ta.sub.2 O.sub.5 and ZrO.sub.2 layers of high refractive index and Sio.sub.2 or SnO.sub.2 layers of low refractive index, which are provided alternatingly atop one another (see, for example, JP-A-07/078601 and JP-A-02/250201). Layer application can take place by sputterin

REFERENCES:
patent: 3723155 (1973-03-01), Greenberg et al.
patent: 4359536 (1982-11-01), Graff et al.
patent: 4898842 (1990-02-01), David

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