Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1996-08-01
1998-03-24
Cameron, Erma
Stock material or miscellaneous articles
Composite
Of quartz or glass
428432, 427168, 427169, 427226, 4273977, 501 12, 10628734, 2523156, B05D 506
Patent
active
057310912
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for producing functional vitreous, preferably colored or colloid-dyed layers on substrates.
Particularly, the invention relates to a process for producing functional vitreous layers on substrates, which process is characterized in that a composition obtainable by hydrolysis and polycondensation of
(A) at least on hydrolyzable silane of general formula (I) groups or hydroxy groups, or an oligomer derived therefrom, and
(B) at least one organosilane of general formula (II) carrying a functional group, X has the meaning given above, and a and b have the values 0, 1, 2 or 3, the sum (a+b) having the values 1, 2 or 3, or an oligomer derived therefrom
in a weight ratio (A):(B) of 5-50:50-95, as well as
(C) optionally, one or more compounds of glass-forming elements, is mixed with at least one function carrier from the group of temperature-stable dyes and pigments, oxides of metals or nonmetals, coloring metal ions, colloids of metals or metal compounds as well as metal ions capable of reacting under reducing conditions to form metal colloids,
the composition admixed with said function carrier is applied onto a substrate and
the coating is densified thermally to form a vitreous layer.
The coating system according to the present invention is based on the surprising finding that despite its relatively high proportion of organic (carbon-containing) components the composition applied onto said substrate may be subjected to a thermal densification at high temperatures without the occurence of cracking or loss of transparency. In said process a steady transformation from an organically modified glass to a completely inorganic (carbon-free) SiO.sub.2 glass takes place. The function carriers introduced, e.g., metal colloids, retain their function (light absorption, light scattering, photochromy, catalysis, etc.) and, for example in the case of metal colloids, result in intensively colored vitreous layers. The fact that it is possible to carry out the thermal densification at relatively high temperatures allows the production of crack-free coatings having a high thermal, mechanical and chemical stability on surfaces of metal, glass and ceramics.
In the hydrolyzable silanes (A) and the organosilanes (B) examples of hydrolyzable groups X are hydrogen or halogen (F, Cl, Br or I), alkoxy (preferably C.sub.1-6 alkoxy such as, e.g., methoxy, ethoxy, n-propoxy, i-propoxy and butoxy), aryloxy (preferably C.sub.6-10 aryloxy such as phenoxy), acyloxy (preferably C.sub.1-6 acyloxy such as acetoxy or propionyloxy), alkylcarbonyl (preferably C.sub.2-7 alkylcarbonyl such as acetyl), amino, monoalkylamino or dialkylamino having 1 to 12, particularly 1 to 6 carbon atoms.
Examples of the non-hydrolyzable radicals R.sup.1 are alkyl (preferably C.sub.1-6 alkyl such as methyl, ethyl, n-propyl, isopropyl, n-butyl, s-butyl, and t-butyl, pentyl, hexyl or cyclohexyl), alkenyl (preferably C.sub.2-6 alkenyl such as vinyl, 1-propenyl, 2-propenyl, and butenyl), alkynyl (preferably C.sub.2-6 alkynyl such as acetylenyl and propargyl), and aryl (preferably C.sub.6-10 aryl such as phenyl and naphthyl). Said radicals R.sup.1 and X may optionally have one or more conventional substituents such as, e.g., halogen or alkoxy.
Specific examples of the functional groups of the radical R.sup.2 are epoxy, hydroxy, ether, amino, monoalkylamino, dialkylamino, amide, carboxy, mercapto, thioether, vinyl, acryloxy, methacryloxy, cyano, halogen, aldehyde, alkylcarbonyl, sulfonic acid and phosphoric acid groups. Said functional groups are bonded to the silicon atom via alkylene, alkenylene or arylene bridging groups which may be interrupted by oxygen or sulfur atoms or -NH groups. Said bridging groups are derived from the above-mentioned alkyl, alkenyl or aryl radicals. The radicals R.sup.2 preferably contain 1 to 18, particularly 1 to 8 carbon atoms.
In general formula (II) a preferably is 0, 1 or 2, b preferably is 1 or 2, and the sum (a+b) preferably is 1 or 2.
Particularly preferred hydrolyzable silanes (A) are tetraalkoxysilanes s
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Bauer Annette
Burkhart Thomas
Fink-Straube Claudia
Jonschker Gerhard
Mennig Martin
Cameron Erma
Institut fuer Neue Materialien Gemeinnuetzige GmbH
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