Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1999-03-11
2000-09-19
Cameron, Erma
Coating processes
With post-treatment of coating or coating material
Heating or drying
427387, 4273897, B05D 302
Patent
active
061208507
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention concerns a colored film forming composition, in particular a composition of excellent preservation stability for forming colored films to be used in windows, mirrors, etc. of automobiles and other vehicles and buildings, and a method for manufacturing colored film coated glass products using the colored film forming composition.
BACKGROUND ART
Among methods of obtaining colored glass is the ion exchange method in which a glass surface is coated with an inorganic salt of silver or an inorganic salt of copper and then baked to cause the silver or copper micro-particles in the inorganic salt to permeate into the glass substrate and thus cause colloidal coloration of glass to occur. There is also a method in which a salt of gold, silver, or other metal is dissolved in a silicon alkoxide solution, the resulting solution is coated onto the substrate, and heat treatment is performed to form a silicon oxide coating containing metal micro-particles.
In particular, glass which has been colored by the surface plasmon of gold or silver micro-particles excels in heat and light resistance and has been used priorly as colored glass or filter glass. In recent years, the sol-gel method has come to be used widely. For example, a method of providing a colored film coated glass plate is described in J. Sol-Gel. Sci. Techn. 1, 305-312 (1994) in which a glass substrate is coated with a solution containing chloroauric acid and alkoxide of silane and then subject to heat treatment to form a silica film as a matrix containing gold micro-particles in the dispersed condition.
However, in obtaining a gold micro-particle dispersion colored film coated glass by the sol-gel method, there was a problem in that in the abovementioned process of heat treatment of the film, the growth of gold micro-particles occurs at the same time as the contraction of the matrix and the gold micro-particles thus tended to become expelled outside of the film. Since the expelled gold micro-particles come off readily when the film is wiped with the hands, the proportion of chloroauric acid in the coating solution that remains as gold micro-particles in the colored film is decreased and the coloring effect is weakened. Also in the actual mass production process, the amount of micro-particles that are expelled outside of the film varies and this has been a factor of variation of the quality of colored glass and has lead to a lowering of yield and increases in cost.
The object of the present invention is to present a colored film forming composition, with which the precipitation of gold micro-particles on the film surface is prevented and gold micro-particle dispersion glass can be manufactured in a stable manner by the sol-gel method, and a method of manufacturing a colored film coated glass product using the colored film forming composition.
DISCLOSURE OF THE INVENTION
The present invention presents in a colored film forming composition, containing at least an organic silicon compound and chloroauric acid, a colored film forming composition characterized by adding at least one type of compound that exhibits the maximum exothermic peak in the range of 170.degree. C. to 250.degree. C., in differential thermal analysis.
In the present invention, an organic compound or an inorganic compound may be used as at least one type of compound, with which the maximum exothermic peak is exhibited (the temperature at which the maximum peak among several exothermic peaks occurs) in the range of 170.degree. C. to 250.degree. C., in differential thermal analysis and which is to be added to the colored film forming composition containing at least an organic silicon compound and chloroauric acid. As said organic compound, an organic compound having one ether bond and a carbon-carbon double bond inside the molecule can be used favorably. Acrylate, methacrylate, and vinyl compounds can be given as favorable examples of such an added organic substance, and trimethylolpropane triacrylate (maximum exothermic peak temperature=234.degree. C.
REFERENCES:
patent: 5589273 (1996-12-01), Dorbath et al.
Innocenzi et al, Journal of Sol-Gel Science and Technology, vol. 1, pp. 305-318, 1994.
Kawazu Mitsuhiro
Kinugawa Katuhiko
Maeda Koichi
Miyauchi Taro
Cameron Erma
Conlin David G.
Hazzard Lisa Swiszcz
Nippon Sheet Glass Co. Ltd.
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